[{"abstract":[{"text":"Enabling additive manufacturing to employ a wide range of novel, functional materials can be a major boost to this technology. However, making such materials printable requires painstaking trial-and-error by an expert operator,\r\nas they typically tend to exhibit peculiar rheological or hysteresis properties. Even in the case of successfully finding the process parameters, there is no guarantee of print-to-print consistency due to material differences between batches. These challenges make closed-loop feedback an attractive option where the process parameters are adjusted on-the-fly. There are several challenges for designing an efficient controller: the deposition parameters are complex and highly coupled, artifacts occur after long time horizons, simulating the deposition is computationally costly, and learning on hardware is intractable. In this work, we demonstrate the feasibility of learning a closed-loop control policy for additive manufacturing using reinforcement learning. We show that approximate, but efficient, numerical simulation is\r\nsufficient as long as it allows learning the behavioral patterns of deposition that translate to real-world experiences. In combination with reinforcement learning, our model can be used to discover control policies that outperform\r\nbaseline controllers. Furthermore, the recovered policies have a minimal sim-to-real gap. We showcase this by applying our control policy in-vivo on a single-layer, direct ink writing printer. ","lang":"eng"}],"day":"01","date_published":"2022-06-01T00:00:00Z","arxiv":1,"author":[{"id":"62E473F4-5C99-11EA-A40E-AF823DDC885E","last_name":"Piovarci","full_name":"Piovarci, Michael","first_name":"Michael","orcid":"0000-0002-5062-4474"},{"first_name":"Michael","full_name":"Foshey, Michael","last_name":"Foshey"},{"full_name":"Xu, Jie","first_name":"Jie","last_name":"Xu"},{"last_name":"Erps","first_name":"Timothy","full_name":"Erps, Timothy"},{"last_name":"Babaei","first_name":"Vahid","full_name":"Babaei, Vahid"},{"last_name":"Didyk","first_name":"Piotr","full_name":"Didyk, Piotr"},{"first_name":"Szymon","full_name":"Rusinkiewicz, Szymon","last_name":"Rusinkiewicz"},{"last_name":"Matusik","full_name":"Matusik, Wojciech","first_name":"Wojciech"},{"last_name":"Bickel","id":"49876194-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6511-9385","first_name":"Bernd","full_name":"Bickel, Bernd"}],"oa":1,"article_type":"original","acknowledgement":"This work is graciously supported by the following grant agencies: FWF Lise Meitner (Grant M 3319), SNSF (Grant 200502), ERC Starting Grant (MATERIALIZABLE-715767), NSF (Grant IIS-181507).\r\n","issue":"4","doi":"10.1145/3528223.3530144","title":"Closed-loop control of direct ink writing via reinforcement learning","has_accepted_license":"1","date_created":"2022-06-10T06:41:47Z","year":"2022","intvolume":"        41","external_id":{"arxiv":["2201.11819"],"isi":["000830989200091"]},"publication_identifier":{"issn":["0730-0301"],"eissn":["1557-7368"]},"ddc":["000"],"file_date_updated":"2022-06-28T08:32:58Z","citation":{"mla":"Piovarci, Michael, et al. “Closed-Loop Control of Direct Ink Writing via Reinforcement Learning.” <i>ACM Transactions on Graphics</i>, vol. 41, no. 4, 112, Association for Computing Machinery, 2022, doi:<a href=\"https://doi.org/10.1145/3528223.3530144\">10.1145/3528223.3530144</a>.","ama":"Piovarci M, Foshey M, Xu J, et al. Closed-loop control of direct ink writing via reinforcement learning. <i>ACM Transactions on Graphics</i>. 2022;41(4). doi:<a href=\"https://doi.org/10.1145/3528223.3530144\">10.1145/3528223.3530144</a>","short":"M. Piovarci, M. Foshey, J. Xu, T. Erps, V. Babaei, P. Didyk, S. Rusinkiewicz, W. Matusik, B. Bickel, ACM Transactions on Graphics 41 (2022).","chicago":"Piovarci, Michael, Michael Foshey, Jie Xu, Timothy Erps, Vahid Babaei, Piotr Didyk, Szymon Rusinkiewicz, Wojciech Matusik, and Bernd Bickel. “Closed-Loop Control of Direct Ink Writing via Reinforcement Learning.” <i>ACM Transactions on Graphics</i>. Association for Computing Machinery, 2022. <a href=\"https://doi.org/10.1145/3528223.3530144\">https://doi.org/10.1145/3528223.3530144</a>.","apa":"Piovarci, M., Foshey, M., Xu, J., Erps, T., Babaei, V., Didyk, P., … Bickel, B. (2022). Closed-loop control of direct ink writing via reinforcement learning. <i>ACM Transactions on Graphics</i>. Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3528223.3530144\">https://doi.org/10.1145/3528223.3530144</a>","ista":"Piovarci M, Foshey M, Xu J, Erps T, Babaei V, Didyk P, Rusinkiewicz S, Matusik W, Bickel B. 2022. Closed-loop control of direct ink writing via reinforcement learning. ACM Transactions on Graphics. 41(4), 112.","ieee":"M. Piovarci <i>et al.</i>, “Closed-loop control of direct ink writing via reinforcement learning,” <i>ACM Transactions on Graphics</i>, vol. 41, no. 4. Association for Computing Machinery, 2022."},"file":[{"access_level":"open_access","checksum":"27f6fe41c6ff84d50445cc9b0176d45b","relation":"main_file","file_id":"11467","date_created":"2022-06-28T08:32:58Z","content_type":"application/pdf","file_name":"2022_ACM_acceptedversion_Piovarci.pdf","creator":"dernst","success":1,"file_size":33994829,"date_updated":"2022-06-28T08:32:58Z"}],"publisher":"Association for Computing Machinery","article_processing_charge":"No","publication":"ACM Transactions on Graphics","project":[{"_id":"eb901961-77a9-11ec-83b8-f5c883a62027","name":"Perception-Aware Appearance Fabrication","grant_number":"M03319"},{"name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","_id":"24F9549A-B435-11E9-9278-68D0E5697425","grant_number":"715767","call_identifier":"H2020"}],"language":[{"iso":"eng"}],"OA_place":"publisher","type":"journal_article","department":[{"_id":"BeBi"}],"ec_funded":1,"corr_author":"1","scopus_import":"1","status":"public","date_updated":"2025-09-10T09:36:45Z","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"OA_type":"hybrid","isi":1,"volume":41,"publication_status":"published","month":"06","oa_version":"Submitted Version","_id":"11442","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","article_number":"112","quality_controlled":"1","related_material":{"link":[{"relation":"press_release","description":"News on ISTA website","url":"https://ista.ac.at/en/news/machine-learning-3d-printing-fluids/"}]},"PlanS_conform":"1"},{"isi":1,"publication_status":"published","month":"07","volume":41,"date_updated":"2025-04-14T07:28:57Z","status":"public","article_number":"150","quality_controlled":"1","related_material":{"link":[{"url":"https://ista.ac.at/en/news/unlocking-interlocking-riddles/","relation":"press_release","description":"News on ISTA website"}]},"oa_version":"Submitted Version","_id":"11735","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","language":[{"iso":"eng"}],"publication":"ACM Transactions on Graphics","project":[{"call_identifier":"H2020","grant_number":"715767","_id":"24F9549A-B435-11E9-9278-68D0E5697425","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling"}],"ec_funded":1,"scopus_import":"1","type":"journal_article","department":[{"_id":"BeBi"}],"year":"2022","date_created":"2022-08-07T22:01:57Z","intvolume":"        41","external_id":{"isi":["000830989200018"]},"publication_identifier":{"issn":["0730-0301"],"eissn":["1557-7368"]},"title":"Computational design of high-level interlocking puzzles","has_accepted_license":"1","citation":{"apa":"Chen, R., Wang, Z., Song, P., &#38; Bickel, B. (2022). Computational design of high-level interlocking puzzles. <i>ACM Transactions on Graphics</i>. Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3528223.3530071\">https://doi.org/10.1145/3528223.3530071</a>","chicago":"Chen, Rulin, Ziqi Wang, Peng Song, and Bernd Bickel. “Computational Design of High-Level Interlocking Puzzles.” <i>ACM Transactions on Graphics</i>. Association for Computing Machinery, 2022. <a href=\"https://doi.org/10.1145/3528223.3530071\">https://doi.org/10.1145/3528223.3530071</a>.","ista":"Chen R, Wang Z, Song P, Bickel B. 2022. Computational design of high-level interlocking puzzles. ACM Transactions on Graphics. 41(4), 150.","ieee":"R. Chen, Z. Wang, P. Song, and B. Bickel, “Computational design of high-level interlocking puzzles,” <i>ACM Transactions on Graphics</i>, vol. 41, no. 4. Association for Computing Machinery, 2022.","ama":"Chen R, Wang Z, Song P, Bickel B. Computational design of high-level interlocking puzzles. <i>ACM Transactions on Graphics</i>. 2022;41(4). doi:<a href=\"https://doi.org/10.1145/3528223.3530071\">10.1145/3528223.3530071</a>","mla":"Chen, Rulin, et al. “Computational Design of High-Level Interlocking Puzzles.” <i>ACM Transactions on Graphics</i>, vol. 41, no. 4, 150, Association for Computing Machinery, 2022, doi:<a href=\"https://doi.org/10.1145/3528223.3530071\">10.1145/3528223.3530071</a>.","short":"R. Chen, Z. Wang, P. Song, B. Bickel, ACM Transactions on Graphics 41 (2022)."},"file":[{"access_level":"open_access","checksum":"0b51651be45b1b33f2072bd5d2686c69","relation":"main_file","file_id":"11992","date_created":"2022-08-28T07:56:19Z","file_size":16896871,"date_updated":"2022-08-28T07:56:19Z","content_type":"application/pdf","success":1,"file_name":"Chen-2022-High-LevelPuzzle_authorVersion.pdf","creator":"bbickel"}],"publisher":"Association for Computing Machinery","article_processing_charge":"No","file_date_updated":"2022-08-28T07:56:19Z","ddc":["000"],"date_published":"2022-07-22T00:00:00Z","author":[{"last_name":"Chen","full_name":"Chen, Rulin","first_name":"Rulin"},{"last_name":"Wang","full_name":"Wang, Ziqi","first_name":"Ziqi"},{"last_name":"Song","first_name":"Peng","full_name":"Song, Peng"},{"orcid":"0000-0001-6511-9385","first_name":"Bernd","full_name":"Bickel, Bernd","last_name":"Bickel","id":"49876194-F248-11E8-B48F-1D18A9856A87"}],"oa":1,"abstract":[{"text":"Interlocking puzzles are intriguing geometric games where the puzzle pieces are held together based on their geometric arrangement, preventing the puzzle from falling apart. High-level-of-difficulty, or simply high-level, interlocking puzzles are a subclass of interlocking puzzles that require multiple moves to take out the first subassembly from the puzzle. Solving a high-level interlocking puzzle is a challenging task since one has to explore many different configurations of the puzzle pieces until reaching a configuration where the first subassembly can be taken out. Designing a high-level interlocking puzzle with a user-specified level of difficulty is even harder since the puzzle pieces have to be interlocking in all the configurations before the first subassembly is taken out.\r\n\r\nIn this paper, we present a computational approach to design high-level interlocking puzzles. The core idea is to represent all possible configurations of an interlocking puzzle as well as transitions among these configurations using a rooted, undirected graph called a disassembly graph and leverage this graph to find a disassembly plan that requires a minimal number of moves to take out the first subassembly from the puzzle. At the design stage, our algorithm iteratively constructs the geometry of each puzzle piece to expand the disassembly graph incrementally, aiming to achieve a user-specified level of difficulty. We show that our approach allows efficient generation of high-level interlocking puzzles of various shape complexities, including new solutions not attainable by state-of-the-art approaches.","lang":"eng"}],"day":"22","doi":"10.1145/3528223.3530071","article_type":"original","acknowledgement":"We thank the reviewers for the valuable comments, David Gontier for sharing the source code of the baseline design approach, Christian Hafner for proofreading the paper, Keenan Crane for the 3D model of Cow, and Thingiverse for the 3D models of Moai and Owl. This work was supported by the SUTD Start-up Research Grant (Number: SRG ISTD 2019 148), the Swiss National Science Foundation (NCCR Digital Fabrication Agreement #51NF40-141853), and\r\nthe European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement No 715767 – MATERIALIZABLE).","issue":"4"},{"publication":"Computer Graphics Forum","keyword":["Computer Graphics and Computer-Aided Design"],"language":[{"iso":"eng"}],"department":[{"_id":"BeBi"}],"type":"journal_article","corr_author":"1","scopus_import":"1","status":"public","date_updated":"2024-10-09T21:03:21Z","month":"09","publication_status":"published","volume":41,"isi":1,"_id":"11993","oa_version":"Submitted Version","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","page":"435-452","quality_controlled":"1","day":"01","abstract":[{"lang":"eng","text":"Moulding refers to a set of manufacturing techniques in which a mould, usually a cavity or a solid frame, is used to shape a liquid or pliable material into an object of the desired shape. The popularity of moulding comes from its effectiveness, scalability and versatility in terms of employed materials. Its relevance as a fabrication process is demonstrated by the extensive literature covering different aspects related to mould design, from material flow simulation to the automation of mould geometry design. In this state-of-the-art report, we provide an extensive review of the automatic methods for the design of moulds, focusing on contributions from a geometric perspective. We classify existing mould design methods based on their computational approach and the nature of their target moulding process. We summarize the relationships between computational approaches and moulding techniques, highlighting their strengths and limitations. Finally, we discuss potential future research directions."}],"oa":1,"author":[{"last_name":"Alderighi","first_name":"Thomas","full_name":"Alderighi, Thomas"},{"full_name":"Malomo, Luigi","first_name":"Luigi","last_name":"Malomo"},{"last_name":"Auzinger","id":"4718F954-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-1546-3265","first_name":"Thomas","full_name":"Auzinger, Thomas"},{"last_name":"Bickel","id":"49876194-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6511-9385","full_name":"Bickel, Bernd","first_name":"Bernd"},{"full_name":"Cignoni, Paulo","first_name":"Paulo","last_name":"Cignoni"},{"full_name":"Pietroni, Nico","first_name":"Nico","last_name":"Pietroni"}],"date_published":"2022-09-01T00:00:00Z","issue":"6","article_type":"original","doi":"10.1111/cgf.14581","has_accepted_license":"1","title":"State of the art in computational mould design","publication_identifier":{"eissn":["1467-8659"],"issn":["0167-7055"]},"external_id":{"isi":["000842638900001"]},"intvolume":"        41","year":"2022","date_created":"2022-08-28T18:17:01Z","ddc":["000"],"file_date_updated":"2022-08-28T18:18:08Z","publisher":"Wiley","file":[{"checksum":"c40cc8ceb7b7f0512172b883d712198e","access_level":"open_access","relation":"main_file","file_id":"11994","description":"This is the pre-peer reviewed version of the following article: Alderighi, T., Malomo, L., Auzinger, T., Bickel, B., Cignoni, P. and Pietroni, N. (2022), State of the Art in Computational Mould Design. Computer Graphics Forum, which has been published in final form at https://doi.org/10.1111/cgf.14581. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.","date_created":"2022-08-28T18:18:08Z","content_type":"application/pdf","creator":"bbickel","file_name":"star_molding_preprint.pdf","date_updated":"2022-08-28T18:18:08Z","file_size":32480850,"title":"pre-peer reviewed version"}],"article_processing_charge":"No","citation":{"short":"T. Alderighi, L. Malomo, T. Auzinger, B. Bickel, P. Cignoni, N. Pietroni, Computer Graphics Forum 41 (2022) 435–452.","ama":"Alderighi T, Malomo L, Auzinger T, Bickel B, Cignoni P, Pietroni N. State of the art in computational mould design. <i>Computer Graphics Forum</i>. 2022;41(6):435-452. doi:<a href=\"https://doi.org/10.1111/cgf.14581\">10.1111/cgf.14581</a>","mla":"Alderighi, Thomas, et al. “State of the Art in Computational Mould Design.” <i>Computer Graphics Forum</i>, vol. 41, no. 6, Wiley, 2022, pp. 435–52, doi:<a href=\"https://doi.org/10.1111/cgf.14581\">10.1111/cgf.14581</a>.","ista":"Alderighi T, Malomo L, Auzinger T, Bickel B, Cignoni P, Pietroni N. 2022. State of the art in computational mould design. Computer Graphics Forum. 41(6), 435–452.","ieee":"T. Alderighi, L. Malomo, T. Auzinger, B. Bickel, P. Cignoni, and N. Pietroni, “State of the art in computational mould design,” <i>Computer Graphics Forum</i>, vol. 41, no. 6. Wiley, pp. 435–452, 2022.","apa":"Alderighi, T., Malomo, L., Auzinger, T., Bickel, B., Cignoni, P., &#38; Pietroni, N. (2022). State of the art in computational mould design. <i>Computer Graphics Forum</i>. Wiley. <a href=\"https://doi.org/10.1111/cgf.14581\">https://doi.org/10.1111/cgf.14581</a>","chicago":"Alderighi, Thomas, Luigi Malomo, Thomas Auzinger, Bernd Bickel, Paulo Cignoni, and Nico Pietroni. “State of the Art in Computational Mould Design.” <i>Computer Graphics Forum</i>. Wiley, 2022. <a href=\"https://doi.org/10.1111/cgf.14581\">https://doi.org/10.1111/cgf.14581</a>."}},{"file_date_updated":"2023-01-24T07:35:21Z","ddc":["000"],"citation":{"ista":"Chen B, Piovarci M, Wang C, Seidel H-P, Didyk P, Myszkowski K, Serrano A. 2022. Gloss management for consistent reproduction of real and virtual objects. SIGGRAPH Asia 2022 Conference Papers. SIGGRAPH: Computer Graphics and Interactive Techniques Conference vol. 2022, 35.","ieee":"B. Chen <i>et al.</i>, “Gloss management for consistent reproduction of real and virtual objects,” in <i>SIGGRAPH Asia 2022 Conference Papers</i>, Daegu, South Korea, 2022, vol. 2022.","chicago":"Chen, Bin, Michael Piovarci, Chao Wang, Hans-Peter Seidel, Piotr Didyk, Karol Myszkowski, and Ana Serrano. “Gloss Management for Consistent Reproduction of Real and Virtual Objects.” In <i>SIGGRAPH Asia 2022 Conference Papers</i>, Vol. 2022. Association for Computing Machinery, 2022. <a href=\"https://doi.org/10.1145/3550469.3555406\">https://doi.org/10.1145/3550469.3555406</a>.","apa":"Chen, B., Piovarci, M., Wang, C., Seidel, H.-P., Didyk, P., Myszkowski, K., &#38; Serrano, A. (2022). Gloss management for consistent reproduction of real and virtual objects. In <i>SIGGRAPH Asia 2022 Conference Papers</i> (Vol. 2022). Daegu, South Korea: Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3550469.3555406\">https://doi.org/10.1145/3550469.3555406</a>","short":"B. Chen, M. Piovarci, C. Wang, H.-P. Seidel, P. Didyk, K. Myszkowski, A. Serrano, in:, SIGGRAPH Asia 2022 Conference Papers, Association for Computing Machinery, 2022.","mla":"Chen, Bin, et al. “Gloss Management for Consistent Reproduction of Real and Virtual Objects.” <i>SIGGRAPH Asia 2022 Conference Papers</i>, vol. 2022, 35, Association for Computing Machinery, 2022, doi:<a href=\"https://doi.org/10.1145/3550469.3555406\">10.1145/3550469.3555406</a>.","ama":"Chen B, Piovarci M, Wang C, et al. Gloss management for consistent reproduction of real and virtual objects. In: <i>SIGGRAPH Asia 2022 Conference Papers</i>. Vol 2022. Association for Computing Machinery; 2022. doi:<a href=\"https://doi.org/10.1145/3550469.3555406\">10.1145/3550469.3555406</a>"},"publisher":"Association for Computing Machinery","article_processing_charge":"No","file":[{"relation":"main_file","access_level":"open_access","checksum":"f47f3215ab8bb919e3546b3438c34c21","file_id":"12351","date_created":"2023-01-24T07:35:21Z","date_updated":"2023-01-24T07:35:21Z","file_size":28826826,"success":1,"creator":"dernst","file_name":"2022_ACM_SIGGRAPH_Chen.pdf","content_type":"application/pdf"}],"title":"Gloss management for consistent reproduction of real and virtual objects","has_accepted_license":"1","year":"2022","date_created":"2023-01-12T12:03:56Z","intvolume":"      2022","external_id":{"isi":["001074614400031"]},"publication_identifier":{"isbn":["9781450394703"]},"acknowledgement":"This work is supported by FWF Lise Meitner (Grant M 3319), European Research Council (project CHAMELEON, Grant no. 682080), Swiss National Science Foundation (Grant no. 200502), and academic gifts from Meta.","doi":"10.1145/3550469.3555406","abstract":[{"lang":"eng","text":"A good match of material appearance between real-world objects and their digital on-screen representations is critical for many applications such as fabrication, design, and e-commerce. However, faithful appearance reproduction is challenging, especially for complex phenomena, such as gloss. In most cases, the view-dependent nature of gloss and the range of luminance values required for reproducing glossy materials exceeds the current capabilities of display devices. As a result, appearance reproduction poses significant problems even with accurately rendered images. This paper studies the gap between the gloss perceived from real-world objects and their digital counterparts. Based on our psychophysical experiments on a wide range of 3D printed samples and their corresponding photographs, we derive insights on the influence of geometry, illumination, and the display’s brightness and measure the change in gloss appearance due to the display limitations. Our evaluation experiments demonstrate that using the prediction to correct material parameters in a rendering system improves the match of gloss appearance between real objects and their visualization on a display device."}],"conference":{"end_date":"2022-12-09","name":"SIGGRAPH: Computer Graphics and Interactive Techniques Conference","start_date":"2022-12-06","location":"Daegu, South Korea"},"day":"01","date_published":"2022-11-01T00:00:00Z","author":[{"last_name":"Chen","first_name":"Bin","full_name":"Chen, Bin"},{"last_name":"Piovarci","id":"62E473F4-5C99-11EA-A40E-AF823DDC885E","orcid":"0000-0002-5062-4474","first_name":"Michael","full_name":"Piovarci, Michael"},{"full_name":"Wang, Chao","first_name":"Chao","last_name":"Wang"},{"full_name":"Seidel, Hans-Peter","first_name":"Hans-Peter","last_name":"Seidel"},{"first_name":"Piotr","full_name":"Didyk, Piotr","last_name":"Didyk"},{"first_name":"Karol","full_name":"Myszkowski, Karol","last_name":"Myszkowski"},{"first_name":"Ana","full_name":"Serrano, Ana","last_name":"Serrano"}],"oa":1,"oa_version":"Published Version","_id":"12135","user_id":"317138e5-6ab7-11ef-aa6d-ffef3953e345","article_number":"35","quality_controlled":"1","date_updated":"2025-09-10T09:47:32Z","status":"public","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"isi":1,"volume":2022,"publication_status":"published","month":"11","type":"conference","department":[{"_id":"BeBi"}],"scopus_import":"1","publication":"SIGGRAPH Asia 2022 Conference Papers","project":[{"name":"Perception-Aware Appearance Fabrication","_id":"eb901961-77a9-11ec-83b8-f5c883a62027","grant_number":"M03319"}],"language":[{"iso":"eng"}]},{"_id":"12452","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","oa_version":"Published Version","article_number":"708","quality_controlled":"1","status":"public","date_updated":"2023-10-31T08:40:55Z","main_file_link":[{"open_access":"1","url":"https://bmvc2022.mpi-inf.mpg.de/708/"}],"publication_status":"published","month":"12","type":"conference","department":[{"_id":"BeBi"}],"scopus_import":"1","publication":"33rd British Machine Vision Conference","language":[{"iso":"eng"}],"file_date_updated":"2023-01-30T10:48:37Z","ddc":["000"],"citation":{"chicago":"Rao, Pramod, Mallikarjun B R, Gereon Fox, Tim Weyrich, Bernd Bickel, Hans-Peter Seidel, Hanspeter Pfister, et al. “VoRF: Volumetric Relightable Faces.” In <i>33rd British Machine Vision Conference</i>. British Machine Vision Association and Society for Pattern Recognition, 2022.","apa":"Rao, P., B R, M., Fox, G., Weyrich, T., Bickel, B., Seidel, H.-P., … Elgharib, M. (2022). VoRF: Volumetric Relightable Faces. In <i>33rd British Machine Vision Conference</i>. London, United Kingdom: British Machine Vision Association and Society for Pattern Recognition.","ieee":"P. Rao <i>et al.</i>, “VoRF: Volumetric Relightable Faces,” in <i>33rd British Machine Vision Conference</i>, London, United Kingdom, 2022.","ista":"Rao P, B R M, Fox G, Weyrich T, Bickel B, Seidel H-P, Pfister H, Matusik W, Tewari A, Theobalt C, Elgharib M. 2022. VoRF: Volumetric Relightable Faces. 33rd British Machine Vision Conference. BMVC: British Machine Vision Conference, 708.","mla":"Rao, Pramod, et al. “VoRF: Volumetric Relightable Faces.” <i>33rd British Machine Vision Conference</i>, 708, British Machine Vision Association and Society for Pattern Recognition, 2022.","ama":"Rao P, B R M, Fox G, et al. VoRF: Volumetric Relightable Faces. In: <i>33rd British Machine Vision Conference</i>. British Machine Vision Association and Society for Pattern Recognition; 2022.","short":"P. Rao, M. B R, G. Fox, T. Weyrich, B. Bickel, H.-P. Seidel, H. Pfister, W. Matusik, A. Tewari, C. Theobalt, M. Elgharib, in:, 33rd British Machine Vision Conference, British Machine Vision Association and Society for Pattern Recognition, 2022."},"file":[{"title":"VoRF: Volumetric Relightable Faces","date_updated":"2023-01-30T10:48:18Z","file_size":5202710,"file_name":"vorf_main.pdf","creator":"bbickel","content_type":"application/pdf","date_created":"2023-01-30T10:48:18Z","file_id":"12453","relation":"main_file","checksum":"b60b70bb48700aee709c85a69231821d","access_level":"open_access"},{"file_id":"12454","checksum":"ce5f4ce66eaaa1590ee5df989fca6f61","access_level":"open_access","relation":"supplementary_material","content_type":"application/pdf","creator":"bbickel","file_name":"vorf_supp.pdf","date_updated":"2023-01-30T10:48:29Z","file_size":37953188,"title":"VoRF: Volumetric Relightable Faces – SUPPLEMENTAL MATERIAL –","date_created":"2023-01-30T10:48:29Z"},{"date_updated":"2023-01-30T10:48:37Z","file_size":57855492,"creator":"bbickel","file_name":"video.mp4","content_type":"video/mp4","date_created":"2023-01-30T10:48:37Z","file_id":"12455","relation":"supplementary_material","checksum":"08aecca434b08fee75ee1efe87943718","access_level":"open_access"}],"publisher":"British Machine Vision Association and Society for Pattern Recognition","article_processing_charge":"No","title":"VoRF: Volumetric Relightable Faces","has_accepted_license":"1","year":"2022","date_created":"2023-01-30T10:47:06Z","acknowledgement":"This work was supported by the ERC Consolidator Grant 4DReply (770784).","abstract":[{"lang":"eng","text":"Portrait viewpoint and illumination editing is an important problem with several applications in VR/AR, movies, and photography. Comprehensive knowledge of geometry and illumination is critical for obtaining photorealistic results. Current methods are unable to explicitly model in 3D while handing both viewpoint and illumination editing from a single image. In this paper, we propose VoRF, a novel approach that can take even a single portrait image as input and relight human heads under novel illuminations that can be viewed from arbitrary viewpoints. VoRF represents a human head as a continuous volumetric field and learns a prior model of human heads using a coordinate-based MLP with separate latent spaces for identity and illumination. The prior model is learnt in an auto-decoder manner over a diverse class of head shapes and appearances, allowing VoRF to generalize to novel test identities from a single input image. Additionally, VoRF has a reflectance MLP that uses the intermediate features of the prior model for rendering One-Light-at-A-Time (OLAT) images under novel views. We synthesize novel illuminations by combining these OLAT images with target environment maps. Qualitative and quantitative evaluations demonstrate the effectiveness of VoRF for relighting and novel view synthesis even when applied to unseen subjects under uncontrolled illuminations."}],"conference":{"end_date":"2022-11-24","name":"BMVC: British Machine Vision Conference","location":"London, United Kingdom","start_date":"2022-11-21"},"day":"01","date_published":"2022-12-01T00:00:00Z","author":[{"full_name":"Rao, Pramod","first_name":"Pramod","last_name":"Rao"},{"first_name":"Mallikarjun","full_name":"B R, Mallikarjun","last_name":"B R"},{"last_name":"Fox","first_name":"Gereon","full_name":"Fox, Gereon"},{"full_name":"Weyrich, Tim","first_name":"Tim","last_name":"Weyrich"},{"last_name":"Bickel","id":"49876194-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6511-9385","full_name":"Bickel, Bernd","first_name":"Bernd"},{"first_name":"Hans-Peter","full_name":"Seidel, Hans-Peter","last_name":"Seidel"},{"last_name":"Pfister","first_name":"Hanspeter","full_name":"Pfister, Hanspeter"},{"full_name":"Matusik, Wojciech","first_name":"Wojciech","last_name":"Matusik"},{"first_name":"Ayush","full_name":"Tewari, Ayush","last_name":"Tewari"},{"first_name":"Christian","full_name":"Theobalt, Christian","last_name":"Theobalt"},{"first_name":"Mohamed","full_name":"Elgharib, Mohamed","last_name":"Elgharib"}],"oa":1},{"department":[{"_id":"BeBi"}],"type":"journal_article","scopus_import":"1","publication":"ACM Transactions on Graphics","language":[{"iso":"eng"}],"oa_version":"Preprint","_id":"17065","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_number":"32","quality_controlled":"1","main_file_link":[{"open_access":"1","url":"https://doi.org/10.48550/arXiv.2107.12265"}],"date_updated":"2024-08-06T07:03:14Z","status":"public","volume":41,"publication_status":"published","month":"03","acknowledgement":"The authors would like to thank anonymous reviewers for their helpful feedback; Haomiao Wu for her contribution to the algorithm development in the early stage of the project; Elias Baldwin, David Tsay, Alexander Lefort, and Qiyang Tan for helping the experiments.","issue":"3","article_type":"original","doi":"10.1145/3508499","day":"09","abstract":[{"text":"Past work on optimizing fabrication plans given a carpentry design can provide Pareto-optimal plans trading off between material waste, fabrication time, precision, and other considerations. However, when developing fabrication plans, experts rarely restrict to a single design, instead considering families of design variations, sometimes adjusting designs to simplify fabrication. Jointly exploring the design and fabrication plan spaces for each design is intractable using current techniques. We present a new approach to jointly optimize design and fabrication plans for carpentered objects. To make this bi-level optimization tractable, we adapt recent work from program synthesis based on equality graphs (e-graphs), which encode sets of equivalent programs. Our insight is that subproblems within our bi-level problem share significant substructures. By representing both designs and fabrication plans in a new bag of parts (BOP) e-graph, we amortize the cost of optimizing design components shared among multiple candidates. Even using BOP e-graphs, the optimization space grows quickly in practice. Hence, we also show how a feedback-guided search strategy dubbed Iterative Contraction and Expansion on E-graphs (ICEE) can keep the size of the e-graph manageable and direct the search towards promising candidates. We illustrate the advantages of our pipeline through examples from the carpentry domain.","lang":"eng"}],"author":[{"full_name":"Zhao, Haisen","first_name":"Haisen","orcid":"0000-0002-6389-1045","id":"fb7f793a-80d1-11eb-8869-d56e5b2a8ff4","last_name":"Zhao"},{"first_name":"Max","full_name":"Willsey, Max","last_name":"Willsey"},{"full_name":"Zhu, Amy","first_name":"Amy","last_name":"Zhu"},{"full_name":"Nandi, Chandrakana","first_name":"Chandrakana","last_name":"Nandi"},{"last_name":"Tatlock","first_name":"Zachary","full_name":"Tatlock, Zachary"},{"full_name":"Solomon, Justin","first_name":"Justin","last_name":"Solomon"},{"full_name":"Schulz, Adriana","first_name":"Adriana","last_name":"Schulz"}],"arxiv":1,"oa":1,"date_published":"2022-03-09T00:00:00Z","article_processing_charge":"No","publisher":"Association for Computing Machinery","citation":{"chicago":"Zhao, Haisen, Max Willsey, Amy Zhu, Chandrakana Nandi, Zachary Tatlock, Justin Solomon, and Adriana Schulz. “Co-Optimization of Design and Fabrication Plans for Carpentry.” <i>ACM Transactions on Graphics</i>. Association for Computing Machinery, 2022. <a href=\"https://doi.org/10.1145/3508499\">https://doi.org/10.1145/3508499</a>.","apa":"Zhao, H., Willsey, M., Zhu, A., Nandi, C., Tatlock, Z., Solomon, J., &#38; Schulz, A. (2022). Co-optimization of design and fabrication plans for carpentry. <i>ACM Transactions on Graphics</i>. Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3508499\">https://doi.org/10.1145/3508499</a>","ieee":"H. Zhao <i>et al.</i>, “Co-optimization of design and fabrication plans for carpentry,” <i>ACM Transactions on Graphics</i>, vol. 41, no. 3. Association for Computing Machinery, 2022.","ista":"Zhao H, Willsey M, Zhu A, Nandi C, Tatlock Z, Solomon J, Schulz A. 2022. Co-optimization of design and fabrication plans for carpentry. ACM Transactions on Graphics. 41(3), 32.","ama":"Zhao H, Willsey M, Zhu A, et al. Co-optimization of design and fabrication plans for carpentry. <i>ACM Transactions on Graphics</i>. 2022;41(3). doi:<a href=\"https://doi.org/10.1145/3508499\">10.1145/3508499</a>","mla":"Zhao, Haisen, et al. “Co-Optimization of Design and Fabrication Plans for Carpentry.” <i>ACM Transactions on Graphics</i>, vol. 41, no. 3, 32, Association for Computing Machinery, 2022, doi:<a href=\"https://doi.org/10.1145/3508499\">10.1145/3508499</a>.","short":"H. Zhao, M. Willsey, A. Zhu, C. Nandi, Z. Tatlock, J. Solomon, A. Schulz, ACM Transactions on Graphics 41 (2022)."},"title":"Co-optimization of design and fabrication plans for carpentry","external_id":{"arxiv":["2107.12265"]},"publication_identifier":{"eissn":["1557-7368"],"issn":["0730-0301"]},"year":"2022","date_created":"2024-05-29T06:09:23Z","intvolume":"        41"},{"day":"09","publication":"bioRxiv","abstract":[{"text":"Complex wiring between neurons underlies the information-processing network enabling all brain functions, including cognition and memory. For understanding how the network is structured, processes information, and changes over time, comprehensive visualization of the architecture of living brain tissue with its cellular and molecular components would open up major opportunities. However, electron microscopy (EM) provides nanometre-scale resolution required for full <jats:italic>in-silico</jats:italic> reconstruction<jats:sup>1–5</jats:sup>, yet is limited to fixed specimens and static representations. Light microscopy allows live observation, with super-resolution approaches<jats:sup>6–12</jats:sup> facilitating nanoscale visualization, but comprehensive 3D-reconstruction of living brain tissue has been hindered by tissue photo-burden, photobleaching, insufficient 3D-resolution, and inadequate signal-to-noise ratio (SNR). Here we demonstrate saturated reconstruction of living brain tissue. We developed an integrated imaging and analysis technology, adapting stimulated emission depletion (STED) microscopy<jats:sup>6,13</jats:sup> in extracellularly labelled tissue<jats:sup>14</jats:sup> for high SNR and near-isotropic resolution. Centrally, a two-stage deep-learning approach leveraged previously obtained information on sample structure to drastically reduce photo-burden and enable automated volumetric reconstruction down to single synapse level. Live reconstruction provides unbiased analysis of tissue architecture across time in relation to functional activity and targeted activation, and contextual understanding of molecular labelling. This adoptable technology will facilitate novel insights into the dynamic functional architecture of living brain tissue.","lang":"eng"}],"language":[{"iso":"eng"}],"author":[{"id":"39BDC62C-F248-11E8-B48F-1D18A9856A87","last_name":"Velicky","full_name":"Velicky, Philipp","first_name":"Philipp","orcid":"0000-0002-2340-7431"},{"id":"3FB91342-F248-11E8-B48F-1D18A9856A87","last_name":"Miguel Villalba","full_name":"Miguel Villalba, Eder","first_name":"Eder","orcid":"0000-0001-5665-0430"},{"orcid":"0000-0003-3862-1235","full_name":"Michalska, Julia M","first_name":"Julia M","last_name":"Michalska","id":"443DB6DE-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Donglai","full_name":"Wei, Donglai","last_name":"Wei"},{"first_name":"Zudi","full_name":"Lin, Zudi","last_name":"Lin"},{"id":"63836096-4690-11EA-BD4E-32803DDC885E","last_name":"Watson","full_name":"Watson, Jake","first_name":"Jake","orcid":"0000-0002-8698-3823"},{"first_name":"Jakob","full_name":"Troidl, Jakob","last_name":"Troidl"},{"full_name":"Beyer, Johanna","first_name":"Johanna","last_name":"Beyer"},{"last_name":"Ben Simon","id":"43DF3136-F248-11E8-B48F-1D18A9856A87","first_name":"Yoav","full_name":"Ben Simon, Yoav"},{"full_name":"Sommer, Christoph M","first_name":"Christoph M","orcid":"0000-0003-1216-9105","id":"4DF26D8C-F248-11E8-B48F-1D18A9856A87","last_name":"Sommer"},{"last_name":"Jahr","id":"425C1CE8-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0003-0201-2315","full_name":"Jahr, Wiebke","first_name":"Wiebke"},{"full_name":"Cenameri, Alban","first_name":"Alban","last_name":"Cenameri","id":"9ac8f577-2357-11eb-997a-e566c5550886"},{"last_name":"Broichhagen","first_name":"Johannes","full_name":"Broichhagen, Johannes"},{"full_name":"Grant, Seth G. N.","first_name":"Seth G. N.","last_name":"Grant"},{"id":"353C1B58-F248-11E8-B48F-1D18A9856A87","last_name":"Jonas","full_name":"Jonas, Peter M","first_name":"Peter M","orcid":"0000-0001-5001-4804"},{"id":"3E57A680-F248-11E8-B48F-1D18A9856A87","last_name":"Novarino","full_name":"Novarino, Gaia","first_name":"Gaia","orcid":"0000-0002-7673-7178"},{"full_name":"Pfister, Hanspeter","first_name":"Hanspeter","last_name":"Pfister"},{"orcid":"0000-0001-6511-9385","first_name":"Bernd","full_name":"Bickel, Bernd","last_name":"Bickel","id":"49876194-F248-11E8-B48F-1D18A9856A87"},{"id":"42EFD3B6-F248-11E8-B48F-1D18A9856A87","last_name":"Danzl","full_name":"Danzl, Johann G","first_name":"Johann G","orcid":"0000-0001-8559-3973"}],"oa":1,"date_published":"2022-05-09T00:00:00Z","department":[{"_id":"PeJo"},{"_id":"GaNo"},{"_id":"BeBi"},{"_id":"JoDa"}],"OA_place":"repository","type":"preprint","corr_author":"1","doi":"10.1101/2022.03.16.484431","main_file_link":[{"url":"https://doi.org/10.1101/2022.03.16.484431","open_access":"1"}],"status":"public","date_updated":"2026-07-03T22:30:45Z","title":"Saturated reconstruction of living brain tissue","month":"05","publication_status":"draft","date_created":"2022-08-23T11:07:59Z","year":"2022","oa_version":"Preprint","_id":"11943","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","related_material":{"record":[{"relation":"later_version","id":"13267","status":"public"},{"status":"public","id":"12470","relation":"dissertation_contains"}]},"article_processing_charge":"No","publisher":"Cold Spring Harbor Laboratory","citation":{"mla":"Velicky, Philipp, et al. “Saturated Reconstruction of Living Brain Tissue.” <i>BioRxiv</i>, Cold Spring Harbor Laboratory, doi:<a href=\"https://doi.org/10.1101/2022.03.16.484431\">10.1101/2022.03.16.484431</a>.","ama":"Velicky P, Miguel Villalba E, Michalska JM, et al. Saturated reconstruction of living brain tissue. <i>bioRxiv</i>. doi:<a href=\"https://doi.org/10.1101/2022.03.16.484431\">10.1101/2022.03.16.484431</a>","short":"P. Velicky, E. Miguel Villalba, J.M. Michalska, D. Wei, Z. Lin, J. Watson, J. Troidl, J. Beyer, Y. Ben Simon, C.M. Sommer, W. Jahr, A. Cenameri, J. Broichhagen, S.G.N. Grant, P.M. Jonas, G. Novarino, H. Pfister, B. Bickel, J.G. Danzl, BioRxiv (n.d.).","chicago":"Velicky, Philipp, Eder Miguel Villalba, Julia M Michalska, Donglai Wei, Zudi Lin, Jake Watson, Jakob Troidl, et al. “Saturated Reconstruction of Living Brain Tissue.” <i>BioRxiv</i>. Cold Spring Harbor Laboratory, n.d. <a href=\"https://doi.org/10.1101/2022.03.16.484431\">https://doi.org/10.1101/2022.03.16.484431</a>.","apa":"Velicky, P., Miguel Villalba, E., Michalska, J. M., Wei, D., Lin, Z., Watson, J., … Danzl, J. G. (n.d.). Saturated reconstruction of living brain tissue. <i>bioRxiv</i>. Cold Spring Harbor Laboratory. <a href=\"https://doi.org/10.1101/2022.03.16.484431\">https://doi.org/10.1101/2022.03.16.484431</a>","ista":"Velicky P, Miguel Villalba E, Michalska JM, Wei D, Lin Z, Watson J, Troidl J, Beyer J, Ben Simon Y, Sommer CM, Jahr W, Cenameri A, Broichhagen J, Grant SGN, Jonas PM, Novarino G, Pfister H, Bickel B, Danzl JG. Saturated reconstruction of living brain tissue. bioRxiv, <a href=\"https://doi.org/10.1101/2022.03.16.484431\">10.1101/2022.03.16.484431</a>.","ieee":"P. Velicky <i>et al.</i>, “Saturated reconstruction of living brain tissue,” <i>bioRxiv</i>. Cold Spring Harbor Laboratory."}},{"language":[{"iso":"eng"}],"project":[{"name":"Distributed 3D Object Design","_id":"2508E324-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"642841"}],"publication":"34th Annual ACM Symposium","scopus_import":"1","ec_funded":1,"department":[{"_id":"BeBi"}],"type":"conference","month":"10","publication_status":"published","status":"public","date_updated":"2025-03-31T15:58:15Z","quality_controlled":"1","user_id":"8b945eb4-e2f2-11eb-945a-df72226e66a9","_id":"10148","oa_version":"Preprint","page":"954-971","oa":1,"author":[{"last_name":"Degraen","first_name":"Donald","full_name":"Degraen, Donald"},{"orcid":"0000-0002-5062-4474","full_name":"Piovarci, Michael","first_name":"Michael","last_name":"Piovarci","id":"62E473F4-5C99-11EA-A40E-AF823DDC885E"},{"full_name":"Bickel, Bernd","first_name":"Bernd","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","last_name":"Bickel"},{"first_name":"Antonio","full_name":"Kruger, Antonio","last_name":"Kruger"}],"date_published":"2021-10-10T00:00:00Z","day":"10","conference":{"start_date":"2021-10-10","location":"Virtual","name":"UIST: User Interface Software and Technology","end_date":"2021-10-14"},"abstract":[{"lang":"eng","text":"Tactile feedback of an object’s surface enables us to discern its material properties and affordances. This understanding is used in digital fabrication processes by creating objects with high-resolution surface variations to influence a user’s tactile perception. As the design of such surface haptics commonly relies on knowledge from real-life experiences, it is unclear how to adapt this information for digital design methods. In this work, we investigate replicating the haptics of real materials. Using an existing process for capturing an object’s microgeometry, we digitize and reproduce the stable surface information of a set of 15 fabric samples. In a psychophysical experiment, we evaluate the tactile qualities of our set of original samples and their replicas. From our results, we see that direct reproduction of surface variations is able to influence different psychophysical dimensions of the tactile perception of surface textures. While the fabrication process did not preserve all properties, our approach underlines that replication of surface microgeometries benefits fabrication methods in terms of haptic perception by covering a large range of tactile variations. Moreover, by changing the surface structure of a single fabricated material, its material perception can be influenced. We conclude by proposing strategies for capturing and reproducing digitized textures to better resemble the perceived haptics of the originals."}],"doi":"10.1145/3472749.3474798","acknowledgement":"Our gratitude goes out to Kamila Mushkina, Akhmajon Makhsadov, Jordan Espenshade, Bruno Fruchard, Roland Bennewitz, and Robert Drumm. This project has received funding from the EU’s Horizon 2020 research and innovation programme, under the Marie Skłodowska-Curie grant agreement No 642841 (DISTRO).","publication_identifier":{"isbn":["978-1-4503-8635-7"]},"year":"2021","date_created":"2021-10-18T07:36:11Z","has_accepted_license":"1","title":"Capturing tactile properties of real surfaces for haptic reproduction","publisher":"Association for Computing Machinery","article_processing_charge":"No","file":[{"checksum":"b0b26464df79b3a59e8ed82e4e19ab15","access_level":"open_access","relation":"main_file","file_id":"10149","date_created":"2021-10-18T07:36:03Z","date_updated":"2021-10-18T07:36:03Z","file_size":29796364,"content_type":"application/pdf","file_name":"degraen-UIST2021_Texture_Appropriation_CR_preprint.pdf","creator":"bbickel"}],"citation":{"ista":"Degraen D, Piovarci M, Bickel B, Kruger A. 2021. Capturing tactile properties of real surfaces for haptic reproduction. 34th Annual ACM Symposium. UIST: User Interface Software and Technology, 954–971.","ieee":"D. Degraen, M. Piovarci, B. Bickel, and A. Kruger, “Capturing tactile properties of real surfaces for haptic reproduction,” in <i>34th Annual ACM Symposium</i>, Virtual, 2021, pp. 954–971.","chicago":"Degraen, Donald, Michael Piovarci, Bernd Bickel, and Antonio Kruger. “Capturing Tactile Properties of Real Surfaces for Haptic Reproduction.” In <i>34th Annual ACM Symposium</i>, 954–71. Association for Computing Machinery, 2021. <a href=\"https://doi.org/10.1145/3472749.3474798\">https://doi.org/10.1145/3472749.3474798</a>.","apa":"Degraen, D., Piovarci, M., Bickel, B., &#38; Kruger, A. (2021). Capturing tactile properties of real surfaces for haptic reproduction. In <i>34th Annual ACM Symposium</i> (pp. 954–971). Virtual: Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3472749.3474798\">https://doi.org/10.1145/3472749.3474798</a>","short":"D. Degraen, M. Piovarci, B. Bickel, A. Kruger, in:, 34th Annual ACM Symposium, Association for Computing Machinery, 2021, pp. 954–971.","mla":"Degraen, Donald, et al. “Capturing Tactile Properties of Real Surfaces for Haptic Reproduction.” <i>34th Annual ACM Symposium</i>, Association for Computing Machinery, 2021, pp. 954–71, doi:<a href=\"https://doi.org/10.1145/3472749.3474798\">10.1145/3472749.3474798</a>.","ama":"Degraen D, Piovarci M, Bickel B, Kruger A. Capturing tactile properties of real surfaces for haptic reproduction. In: <i>34th Annual ACM Symposium</i>. Association for Computing Machinery; 2021:954-971. doi:<a href=\"https://doi.org/10.1145/3472749.3474798\">10.1145/3472749.3474798</a>"},"ddc":["000"],"file_date_updated":"2021-10-18T07:36:03Z"},{"_id":"10184","oa_version":"Submitted Version","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_number":"272","quality_controlled":"1","main_file_link":[{"url":"http://vcg.isti.cnr.it/Publications/2021/AMBCP21","open_access":"1"}],"date_updated":"2025-04-14T07:28:57Z","status":"public","isi":1,"month":"12","volume":40,"publication_status":"published","department":[{"_id":"BeBi"}],"type":"journal_article","scopus_import":"1","ec_funded":1,"project":[{"name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","_id":"24F9549A-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","grant_number":"715767"}],"publication":"ACM Transactions on Graphics","language":[{"iso":"eng"}],"file_date_updated":"2021-10-27T07:08:07Z","ddc":["000"],"file":[{"file_id":"10185","relation":"main_file","checksum":"384ece7a9ad1026787ba9560b04336d5","access_level":"open_access","creator":"bbickel","file_name":"rigidmolds-authorversion.pdf","content_type":"application/pdf","file_size":107708317,"date_updated":"2021-10-27T07:08:07Z","date_created":"2021-10-27T07:08:07Z"}],"publisher":"Association for Computing Machinery","article_processing_charge":"No","citation":{"ama":"Alderighi T, Malomo L, Bickel B, Cignoni P, Pietroni N. Volume decomposition for two-piece rigid casting. <i>ACM Transactions on Graphics</i>. 2021;40(6). doi:<a href=\"https://doi.org/10.1145/3478513.3480555\">10.1145/3478513.3480555</a>","mla":"Alderighi, Thomas, et al. “Volume Decomposition for Two-Piece Rigid Casting.” <i>ACM Transactions on Graphics</i>, vol. 40, no. 6, 272, Association for Computing Machinery, 2021, doi:<a href=\"https://doi.org/10.1145/3478513.3480555\">10.1145/3478513.3480555</a>.","short":"T. Alderighi, L. Malomo, B. Bickel, P. Cignoni, N. Pietroni, ACM Transactions on Graphics 40 (2021).","apa":"Alderighi, T., Malomo, L., Bickel, B., Cignoni, P., &#38; Pietroni, N. (2021). Volume decomposition for two-piece rigid casting. <i>ACM Transactions on Graphics</i>. Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3478513.3480555\">https://doi.org/10.1145/3478513.3480555</a>","chicago":"Alderighi, Thomas, Luigi Malomo, Bernd Bickel, Paolo Cignoni, and Nico Pietroni. “Volume Decomposition for Two-Piece Rigid Casting.” <i>ACM Transactions on Graphics</i>. Association for Computing Machinery, 2021. <a href=\"https://doi.org/10.1145/3478513.3480555\">https://doi.org/10.1145/3478513.3480555</a>.","ieee":"T. Alderighi, L. Malomo, B. Bickel, P. Cignoni, and N. Pietroni, “Volume decomposition for two-piece rigid casting,” <i>ACM Transactions on Graphics</i>, vol. 40, no. 6. Association for Computing Machinery, 2021.","ista":"Alderighi T, Malomo L, Bickel B, Cignoni P, Pietroni N. 2021. Volume decomposition for two-piece rigid casting. ACM Transactions on Graphics. 40(6), 272."},"has_accepted_license":"1","title":"Volume decomposition for two-piece rigid casting","external_id":{"isi":["000729846700077"]},"publication_identifier":{"issn":["0730-0301"],"eissn":["1557-7368 "]},"year":"2021","date_created":"2021-10-27T07:08:19Z","intvolume":"        40","acknowledgement":"The authors thank Marco Callieri for all his precious help with the resin casts. The models used in the paper are courtesy of the Stanford 3D Scanning Repository, the AIM@SHAPE Shape Repository, and Thingi10K Repository. The research was partially funded by the European Research Council (ERC) MATERIALIZABLE: Intelligent fabrication-oriented computational design and modeling (grant no. 715767).","issue":"6","article_type":"original","doi":"10.1145/3478513.3480555","day":"01","abstract":[{"lang":"eng","text":"We introduce a novel technique to automatically decompose an input object’s volume into a set of parts that can be represented by two opposite height fields. Such decomposition enables the manufacturing of individual parts using two-piece reusable rigid molds. Our decomposition strategy relies on a new energy formulation that utilizes a pre-computed signal on the mesh volume representing the accessibility for a predefined set of extraction directions. Thanks to this novel formulation, our method allows for efficient optimization of a fabrication-aware partitioning of volumes in a completely\r\nautomatic way. We demonstrate the efficacy of our approach by generating valid volume partitionings for a wide range of complex objects and physically reproducing several of them."}],"author":[{"last_name":"Alderighi","full_name":"Alderighi, Thomas","first_name":"Thomas"},{"last_name":"Malomo","first_name":"Luigi","full_name":"Malomo, Luigi"},{"last_name":"Bickel","id":"49876194-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6511-9385","first_name":"Bernd","full_name":"Bickel, Bernd"},{"last_name":"Cignoni","full_name":"Cignoni, Paolo","first_name":"Paolo"},{"full_name":"Pietroni, Nico","first_name":"Nico","last_name":"Pietroni"}],"oa":1,"date_published":"2021-12-01T00:00:00Z"},{"_id":"10574","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","page":"2975-2987","oa_version":"Published Version","quality_controlled":"1","status":"public","date_updated":"2023-08-17T06:29:34Z","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"isi":1,"publication_status":"published","month":"12","volume":37,"type":"journal_article","department":[{"_id":"BeBi"}],"scopus_import":"1","publication":"Visual Computer","language":[{"iso":"eng"}],"file_date_updated":"2021-12-27T13:51:08Z","ddc":["000"],"citation":{"chicago":"Chen, Bin, Chao Wang, Michael Piovarci, Hans Peter Seidel, Piotr Didyk, Karol Myszkowski, and Ana Serrano. “The Effect of Geometry and Illumination on Appearance Perception of Different Material Categories.” <i>Visual Computer</i>. Springer Nature, 2021. <a href=\"https://doi.org/10.1007/s00371-021-02227-x\">https://doi.org/10.1007/s00371-021-02227-x</a>.","apa":"Chen, B., Wang, C., Piovarci, M., Seidel, H. P., Didyk, P., Myszkowski, K., &#38; Serrano, A. (2021). The effect of geometry and illumination on appearance perception of different material categories. <i>Visual Computer</i>. Springer Nature. <a href=\"https://doi.org/10.1007/s00371-021-02227-x\">https://doi.org/10.1007/s00371-021-02227-x</a>","ieee":"B. Chen <i>et al.</i>, “The effect of geometry and illumination on appearance perception of different material categories,” <i>Visual Computer</i>, vol. 37, no. 12. Springer Nature, pp. 2975–2987, 2021.","ista":"Chen B, Wang C, Piovarci M, Seidel HP, Didyk P, Myszkowski K, Serrano A. 2021. The effect of geometry and illumination on appearance perception of different material categories. Visual Computer. 37(12), 2975–2987.","mla":"Chen, Bin, et al. “The Effect of Geometry and Illumination on Appearance Perception of Different Material Categories.” <i>Visual Computer</i>, vol. 37, no. 12, Springer Nature, 2021, pp. 2975–87, doi:<a href=\"https://doi.org/10.1007/s00371-021-02227-x\">10.1007/s00371-021-02227-x</a>.","ama":"Chen B, Wang C, Piovarci M, et al. The effect of geometry and illumination on appearance perception of different material categories. <i>Visual Computer</i>. 2021;37(12):2975-2987. doi:<a href=\"https://doi.org/10.1007/s00371-021-02227-x\">10.1007/s00371-021-02227-x</a>","short":"B. Chen, C. Wang, M. Piovarci, H.P. Seidel, P. Didyk, K. Myszkowski, A. Serrano, Visual Computer 37 (2021) 2975–2987."},"file":[{"content_type":"application/pdf","creator":"cchlebak","success":1,"file_name":"2021_VisComput_Chen.pdf","file_size":5741094,"date_updated":"2021-12-27T13:51:08Z","date_created":"2021-12-27T13:51:08Z","file_id":"10578","checksum":"244cfcac0479ca6e3444c098ab2860a1","access_level":"open_access","relation":"main_file"}],"publisher":"Springer Nature","article_processing_charge":"Yes","title":"The effect of geometry and illumination on appearance perception of different material categories","has_accepted_license":"1","date_created":"2021-12-26T23:01:26Z","year":"2021","intvolume":"        37","external_id":{"isi":["000673536600003"]},"publication_identifier":{"eissn":["1432-2315"],"issn":["0178-2789"]},"article_type":"original","acknowledgement":"This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie, grant agreement N∘ 765911 (RealVision) and from the European Research Council (ERC), grant agreement N∘ 804226 (PERDY). Open Access funding enabled and organized by Projekt DEAL.","issue":"12","doi":"10.1007/s00371-021-02227-x","abstract":[{"text":"The understanding of material appearance perception is a complex problem due to interactions between material reflectance, surface geometry, and illumination. Recently, Serrano et al. collected the largest dataset to date with subjective ratings of material appearance attributes, including glossiness, metallicness, sharpness and contrast of reflections. In this work, we make use of their dataset to investigate for the first time the impact of the interactions between illumination, geometry, and eight different material categories in perceived appearance attributes. After an initial analysis, we select for further analysis the four material categories that cover the largest range for all perceptual attributes: fabric, plastic, ceramic, and metal. Using a cumulative link mixed model (CLMM) for robust regression, we discover interactions between these material categories and four representative illuminations and object geometries. We believe that our findings contribute to expanding the knowledge on material appearance perception and can be useful for many applications, such as scene design, where any particular material in a given shape can be aligned with dominant classes of illumination, so that a desired strength of appearance attributes can be achieved.","lang":"eng"}],"day":"01","date_published":"2021-12-01T00:00:00Z","author":[{"last_name":"Chen","first_name":"Bin","full_name":"Chen, Bin"},{"last_name":"Wang","first_name":"Chao","full_name":"Wang, Chao"},{"last_name":"Piovarci","id":"62E473F4-5C99-11EA-A40E-AF823DDC885E","orcid":"0000-0002-5062-4474","full_name":"Piovarci, Michael","first_name":"Michael"},{"last_name":"Seidel","full_name":"Seidel, Hans Peter","first_name":"Hans Peter"},{"last_name":"Didyk","full_name":"Didyk, Piotr","first_name":"Piotr"},{"last_name":"Myszkowski","first_name":"Karol","full_name":"Myszkowski, Karol"},{"full_name":"Serrano, Ana","first_name":"Ana","last_name":"Serrano"}],"oa":1},{"day":"01","abstract":[{"lang":"eng","text":"Volumetric light transport is a pervasive physical phenomenon, and therefore its accurate simulation is important for a broad array of disciplines. While suitable mathematical models for computing the transport are now available, obtaining the necessary material parameters needed to drive such simulations is a challenging task: direct measurements of these parameters from material samples are seldom possible. Building on the inverse scattering paradigm, we present a novel measurement approach which indirectly infers the transport parameters from extrinsic observations of multiple-scattered radiance. The novelty of the proposed approach lies in replacing structured illumination with a structured reflector bonded to the sample, and a robust fitting procedure that largely compensates for potential systematic errors in the calibration of the setup. We show the feasibility of our approach by validating simulations of complex 3D compositions of the measured materials against physical prints, using photo-polymer resins. As presented in this paper, our technique yields colorspace data suitable for accurate appearance reproduction in the area of 3D printing. Beyond that, and without fundamental changes to the basic measurement methodology, it could equally well be used to obtain spectral measurements that are useful for other application areas."}],"oa":1,"author":[{"last_name":"Elek","first_name":"Oskar","full_name":"Elek, Oskar"},{"first_name":"Ran","full_name":"Zhang, Ran","orcid":"0000-0002-3808-281X","id":"4DDBCEB0-F248-11E8-B48F-1D18A9856A87","last_name":"Zhang"},{"last_name":"Sumin","full_name":"Sumin, Denis","first_name":"Denis"},{"last_name":"Myszkowski","full_name":"Myszkowski, Karol","first_name":"Karol"},{"full_name":"Bickel, Bernd","first_name":"Bernd","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","last_name":"Bickel"},{"last_name":"Wilkie","first_name":"Alexander","full_name":"Wilkie, Alexander"},{"last_name":"Křivánek","full_name":"Křivánek, Jaroslav","first_name":"Jaroslav"},{"last_name":"Weyrich","first_name":"Tim","full_name":"Weyrich, Tim"}],"date_published":"2021-03-01T00:00:00Z","issue":"5","acknowledgement":"H2020 Marie Skłodowska-Curie Actions (642841); European Research Council (715767); Grantová Agentura České Republiky (16-08111S, 16-18964S); Univerzita Karlova v Praze (SVV-2017-260452); Engineering and Physical Sciences Research Council (EP/K023578/1).\r\nWe are grateful to Stratasys Ltd. for access to the voxel-level print interface of the J750\r\nmachine.","article_type":"original","doi":"10.1364/OE.406095","has_accepted_license":"1","title":"Robust and practical measurement of volume transport parameters in solid photo-polymer materials for 3D printing","publication_identifier":{"eissn":["1094-4087"]},"external_id":{"isi":["000624968100103"]},"intvolume":"        29","year":"2021","date_created":"2021-03-14T23:01:33Z","file_date_updated":"2021-03-22T08:15:28Z","ddc":["000"],"file":[{"access_level":"open_access","checksum":"a9697ad83136c19ad87e46aa2db63cfd","relation":"main_file","file_id":"9269","date_created":"2021-03-22T08:15:28Z","content_type":"application/pdf","success":1,"file_name":"2021_OpticsExpress_Elek.pdf","creator":"dernst","file_size":10873700,"date_updated":"2021-03-22T08:15:28Z"}],"publisher":"The Optical Society","article_processing_charge":"No","citation":{"short":"O. Elek, R. Zhang, D. Sumin, K. Myszkowski, B. Bickel, A. Wilkie, J. Křivánek, T. Weyrich, Optics Express 29 (2021) 7568–7588.","mla":"Elek, Oskar, et al. “Robust and Practical Measurement of Volume Transport Parameters in Solid Photo-Polymer Materials for 3D Printing.” <i>Optics Express</i>, vol. 29, no. 5, The Optical Society, 2021, pp. 7568–88, doi:<a href=\"https://doi.org/10.1364/OE.406095\">10.1364/OE.406095</a>.","ama":"Elek O, Zhang R, Sumin D, et al. Robust and practical measurement of volume transport parameters in solid photo-polymer materials for 3D printing. <i>Optics Express</i>. 2021;29(5):7568-7588. doi:<a href=\"https://doi.org/10.1364/OE.406095\">10.1364/OE.406095</a>","ieee":"O. Elek <i>et al.</i>, “Robust and practical measurement of volume transport parameters in solid photo-polymer materials for 3D printing,” <i>Optics Express</i>, vol. 29, no. 5. The Optical Society, pp. 7568–7588, 2021.","ista":"Elek O, Zhang R, Sumin D, Myszkowski K, Bickel B, Wilkie A, Křivánek J, Weyrich T. 2021. Robust and practical measurement of volume transport parameters in solid photo-polymer materials for 3D printing. Optics Express. 29(5), 7568–7588.","chicago":"Elek, Oskar, Ran Zhang, Denis Sumin, Karol Myszkowski, Bernd Bickel, Alexander Wilkie, Jaroslav Křivánek, and Tim Weyrich. “Robust and Practical Measurement of Volume Transport Parameters in Solid Photo-Polymer Materials for 3D Printing.” <i>Optics Express</i>. The Optical Society, 2021. <a href=\"https://doi.org/10.1364/OE.406095\">https://doi.org/10.1364/OE.406095</a>.","apa":"Elek, O., Zhang, R., Sumin, D., Myszkowski, K., Bickel, B., Wilkie, A., … Weyrich, T. (2021). Robust and practical measurement of volume transport parameters in solid photo-polymer materials for 3D printing. <i>Optics Express</i>. The Optical Society. <a href=\"https://doi.org/10.1364/OE.406095\">https://doi.org/10.1364/OE.406095</a>"},"project":[{"name":"Distributed 3D Object Design","_id":"2508E324-B435-11E9-9278-68D0E5697425","grant_number":"642841","call_identifier":"H2020"},{"_id":"24F9549A-B435-11E9-9278-68D0E5697425","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","call_identifier":"H2020","grant_number":"715767"}],"publication":"Optics Express","language":[{"iso":"eng"}],"department":[{"_id":"BeBi"}],"type":"journal_article","scopus_import":"1","ec_funded":1,"tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"status":"public","date_updated":"2025-03-31T15:58:16Z","volume":29,"publication_status":"published","month":"03","isi":1,"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","_id":"9241","page":"7568-7588","oa_version":"Published Version","quality_controlled":"1"},{"_id":"9376","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","oa_version":"Published Version","acknowledged_ssus":[{"_id":"M-Shop"}],"quality_controlled":"1","article_number":"186","status":"public","date_updated":"2025-03-31T15:58:16Z","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"publication_status":"published","volume":40,"month":"10","isi":1,"type":"journal_article","department":[{"_id":"BeBi"}],"ec_funded":1,"scopus_import":"1","keyword":["multistability","mechanism","computational design","rigidity"],"publication":"ACM Transactions on Graphics","project":[{"grant_number":"642841","call_identifier":"H2020","_id":"2508E324-B435-11E9-9278-68D0E5697425","name":"Distributed 3D Object Design"},{"_id":"24F9549A-B435-11E9-9278-68D0E5697425","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","grant_number":"715767","call_identifier":"H2020"}],"language":[{"iso":"eng"}],"ddc":["000"],"file_date_updated":"2021-12-17T08:13:51Z","citation":{"ista":"Zhang R, Auzinger T, Bickel B. 2021. Computational design of planar multistable compliant structures. ACM Transactions on Graphics. 40(5), 186.","ieee":"R. Zhang, T. Auzinger, and B. Bickel, “Computational design of planar multistable compliant structures,” <i>ACM Transactions on Graphics</i>, vol. 40, no. 5. Association for Computing Machinery, 2021.","chicago":"Zhang, Ran, Thomas Auzinger, and Bernd Bickel. “Computational Design of Planar Multistable Compliant Structures.” <i>ACM Transactions on Graphics</i>. Association for Computing Machinery, 2021. <a href=\"https://doi.org/10.1145/3453477\">https://doi.org/10.1145/3453477</a>.","apa":"Zhang, R., Auzinger, T., &#38; Bickel, B. (2021). Computational design of planar multistable compliant structures. <i>ACM Transactions on Graphics</i>. Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3453477\">https://doi.org/10.1145/3453477</a>","short":"R. Zhang, T. Auzinger, B. Bickel, ACM Transactions on Graphics 40 (2021).","ama":"Zhang R, Auzinger T, Bickel B. Computational design of planar multistable compliant structures. <i>ACM Transactions on Graphics</i>. 2021;40(5). doi:<a href=\"https://doi.org/10.1145/3453477\">10.1145/3453477</a>","mla":"Zhang, Ran, et al. “Computational Design of Planar Multistable Compliant Structures.” <i>ACM Transactions on Graphics</i>, vol. 40, no. 5, 186, Association for Computing Machinery, 2021, doi:<a href=\"https://doi.org/10.1145/3453477\">10.1145/3453477</a>."},"file":[{"relation":"main_file","access_level":"open_access","checksum":"8564b3118457d4c8939a8ef2b1a2f16c","file_id":"9377","date_created":"2021-05-08T17:36:59Z","file_size":18926557,"date_updated":"2021-05-08T17:36:59Z","file_name":"Multistable-authorversion.pdf","creator":"bbickel","content_type":"application/pdf"},{"date_created":"2021-05-08T17:38:22Z","date_updated":"2021-05-08T17:38:22Z","file_size":76542901,"success":1,"file_name":"multistable-video.mp4","creator":"bbickel","content_type":"video/mp4","relation":"main_file","checksum":"3b6e874e30bfa1bfc3ad3498710145a1","access_level":"open_access","file_id":"9378"},{"file_id":"10562","relation":"supplementary_material","access_level":"open_access","checksum":"20dc3bc42e1a912a5b0247c116772098","file_name":"multistable-supplementary material.pdf","creator":"bbickel","content_type":"application/pdf","title":"Supplementary Material for “Computational Design of Planar Multistable Compliant Structures”","date_updated":"2021-12-17T08:13:51Z","file_size":3367072,"description":"This document provides additional results and analyzes the robustness and limitations of our approach.","date_created":"2021-12-17T08:13:51Z"}],"article_processing_charge":"No","publisher":"Association for Computing Machinery","title":"Computational design of planar multistable compliant structures","has_accepted_license":"1","intvolume":"        40","year":"2021","date_created":"2021-05-08T17:37:08Z","publication_identifier":{"issn":["0730-0301"],"eissn":["1557-7368"]},"external_id":{"isi":["000752079300003"]},"article_type":"original","issue":"5","acknowledgement":"We would like to thank everyone who contributed to this paper, the authors of artworks for all the examples, including @macrovec-tor_official and Wikimedia for the FLAG semaphore, and @pikisuper-star for the FIGURINE. The photos of iconic poses in the teaser were supplied by (from left to right): Mike Hewitt/Olympics Day 8 - Athletics/Gettty Images, Oneinchpunch/Basketball player training on acourt in New york city/Shutterstock, and Andrew Redington/TigerWoods/Getty Images. We also want to express our gratitude to Christian Hafner for insightful discussions, the IST Austria machine shop SSU, all proof-readers, and anonymous reviewers. This project has received funding from the European Union’s Horizon 2020 research and innovation programme, under the Marie Skłodowska-Curie grant agreement No 642841 (DISTRO), and under the European Research Council grant agreement No 715767 (MATERIALIZABLE).","doi":"10.1145/3453477","abstract":[{"lang":"eng","text":"This paper presents a method for designing planar multistable compliant structures. Given a sequence of desired stable states and the corresponding poses of the structure, we identify the topology and geometric realization of a mechanism—consisting of bars and joints—that is able to physically reproduce the desired multistable behavior. In order to solve this problem efficiently, we build on insights from minimally rigid graph theory to identify simple but effective topologies for the mechanism. We then optimize its geometric parameters, such as joint positions and bar lengths, to obtain correct transitions between the given poses. Simultaneously, we ensure adequate stability of each pose based on an effective approximate error metric related to the elastic energy Hessian of the bars in the mechanism. As demonstrated by our results, we obtain functional multistable mechanisms of manageable complexity that can be fabricated using 3D printing. Further, we evaluated the effectiveness of our method on a large number of examples in the simulation and fabricated several physical prototypes."}],"day":"08","date_published":"2021-10-08T00:00:00Z","oa":1,"author":[{"id":"4DDBCEB0-F248-11E8-B48F-1D18A9856A87","last_name":"Zhang","first_name":"Ran","full_name":"Zhang, Ran","orcid":"0000-0002-3808-281X"},{"id":"4718F954-F248-11E8-B48F-1D18A9856A87","last_name":"Auzinger","first_name":"Thomas","full_name":"Auzinger, Thomas","orcid":"0000-0002-1546-3265"},{"id":"49876194-F248-11E8-B48F-1D18A9856A87","last_name":"Bickel","full_name":"Bickel, Bernd","first_name":"Bernd","orcid":"0000-0001-6511-9385"}]},{"tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"status":"public","date_updated":"2025-07-10T12:01:44Z","publication_status":"published","volume":27,"month":"06","isi":1,"oa_version":"Published Version","_id":"9408","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","quality_controlled":"1","article_number":"2881-2895","project":[{"call_identifier":"H2020","grant_number":"715767","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","_id":"24F9549A-B435-11E9-9278-68D0E5697425"}],"publication":"IEEE Transactions on Visualization and Computer Graphics","language":[{"iso":"eng"}],"department":[{"_id":"BeBi"}],"type":"journal_article","scopus_import":"1","ec_funded":1,"has_accepted_license":"1","title":"Computational design of skinned Quad-Robots","pmid":1,"publication_identifier":{"eissn":["1077-2626"],"issn":["1941-0506"]},"external_id":{"pmid":["31804937"],"isi":["000649620700009"]},"intvolume":"        27","date_created":"2021-05-23T22:01:42Z","year":"2021","file_date_updated":"2021-05-25T15:08:49Z","ddc":["000"],"article_processing_charge":"No","file":[{"date_created":"2021-05-25T15:08:49Z","content_type":"application/pdf","file_name":"2021_TVCG_Feng.pdf","success":1,"creator":"kschuh","date_updated":"2021-05-25T15:08:49Z","file_size":6183002,"access_level":"open_access","checksum":"a78e6ac94e33ade4ffaea66943d5f7dc","relation":"main_file","file_id":"9427"}],"publisher":"IEEE","citation":{"apa":"Feng, X., Liu, J., Wang, H., Yang, Y., Bao, H., Bickel, B., &#38; Xu, W. (2021). Computational design of skinned Quad-Robots. <i>IEEE Transactions on Visualization and Computer Graphics</i>. IEEE. <a href=\"https://doi.org/10.1109/TVCG.2019.2957218\">https://doi.org/10.1109/TVCG.2019.2957218</a>","chicago":"Feng, Xudong, Jiafeng Liu, Huamin Wang, Yin Yang, Hujun Bao, Bernd Bickel, and Weiwei Xu. “Computational Design of Skinned Quad-Robots.” <i>IEEE Transactions on Visualization and Computer Graphics</i>. IEEE, 2021. <a href=\"https://doi.org/10.1109/TVCG.2019.2957218\">https://doi.org/10.1109/TVCG.2019.2957218</a>.","ieee":"X. Feng <i>et al.</i>, “Computational design of skinned Quad-Robots,” <i>IEEE Transactions on Visualization and Computer Graphics</i>, vol. 27, no. 6. IEEE, 2021.","ista":"Feng X, Liu J, Wang H, Yang Y, Bao H, Bickel B, Xu W. 2021. Computational design of skinned Quad-Robots. IEEE Transactions on Visualization and Computer Graphics. 27(6), 2881–2895.","ama":"Feng X, Liu J, Wang H, et al. Computational design of skinned Quad-Robots. <i>IEEE Transactions on Visualization and Computer Graphics</i>. 2021;27(6). doi:<a href=\"https://doi.org/10.1109/TVCG.2019.2957218\">10.1109/TVCG.2019.2957218</a>","mla":"Feng, Xudong, et al. “Computational Design of Skinned Quad-Robots.” <i>IEEE Transactions on Visualization and Computer Graphics</i>, vol. 27, no. 6, 2881–2895, IEEE, 2021, doi:<a href=\"https://doi.org/10.1109/TVCG.2019.2957218\">10.1109/TVCG.2019.2957218</a>.","short":"X. Feng, J. Liu, H. Wang, Y. Yang, H. Bao, B. Bickel, W. Xu, IEEE Transactions on Visualization and Computer Graphics 27 (2021)."},"day":"01","abstract":[{"lang":"eng","text":"We present a computational design system that assists users to model, optimize, and fabricate quad-robots with soft skins. Our system addresses the challenging task of predicting their physical behavior by fully integrating the multibody dynamics of the mechanical skeleton and the elastic behavior of the soft skin. The developed motion control strategy uses an alternating optimization scheme to avoid expensive full space time-optimization, interleaving space-time optimization for the skeleton, and frame-by-frame optimization for the full dynamics. The output are motor torques to drive the robot to achieve a user prescribed motion trajectory. We also provide a collection of convenient engineering tools and empirical manufacturing guidance to support the fabrication of the designed quad-robot. We validate the feasibility of designs generated with our system through physics simulations and with a physically-fabricated prototype."}],"oa":1,"author":[{"first_name":"Xudong","full_name":"Feng, Xudong","last_name":"Feng"},{"last_name":"Liu","first_name":"Jiafeng","full_name":"Liu, Jiafeng"},{"first_name":"Huamin","full_name":"Wang, Huamin","last_name":"Wang"},{"last_name":"Yang","full_name":"Yang, Yin","first_name":"Yin"},{"last_name":"Bao","first_name":"Hujun","full_name":"Bao, Hujun"},{"orcid":"0000-0001-6511-9385","full_name":"Bickel, Bernd","first_name":"Bernd","last_name":"Bickel","id":"49876194-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Xu","first_name":"Weiwei","full_name":"Xu, Weiwei"}],"date_published":"2021-06-01T00:00:00Z","issue":"6","acknowledgement":"The authors would like to thank anonymous reviewers for their constructive comments. Weiwei Xu is partially supported by Zhejiang Lab. Yin Yang is partially spported by NSF under Grant Nos. CHS 1845024 and 1717972. Weiwei Xu and Hujun Bao are supported by Fundamental Research Funds for the Central Universities. This project has received funding from the European Research Council (ERC) under the European Unions Horizon 2020 research and innovation programme (Grant agreement No 715767).","doi":"10.1109/TVCG.2019.2957218"},{"status":"public","date_updated":"2025-03-31T15:58:16Z","isi":1,"volume":40,"publication_status":"published","month":"05","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","_id":"9547","page":"205-219","oa_version":"Submitted Version","quality_controlled":"1","project":[{"_id":"2508E324-B435-11E9-9278-68D0E5697425","name":"Distributed 3D Object Design","call_identifier":"H2020","grant_number":"642841"},{"call_identifier":"H2020","grant_number":"715767","_id":"24F9549A-B435-11E9-9278-68D0E5697425","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling"}],"publication":"Computer Graphics Forum","language":[{"iso":"eng"}],"department":[{"_id":"BeBi"}],"type":"journal_article","scopus_import":"1","ec_funded":1,"has_accepted_license":"1","title":"Neural acceleration of scattering-aware color 3D printing","external_id":{"isi":["000657959600017"]},"publication_identifier":{"eissn":["1467-8659"],"issn":["0167-7055"]},"date_created":"2021-06-13T22:01:32Z","year":"2021","intvolume":"        40","ddc":["004"],"file_date_updated":"2021-10-11T12:06:50Z","publisher":"Wiley","file":[{"date_created":"2021-10-11T12:06:50Z","content_type":"application/pdf","creator":"bbickel","file_name":"ScatteringAwareColor3DPrinting_authorVersion.pdf","success":1,"file_size":26026501,"date_updated":"2021-10-11T12:06:50Z","checksum":"33271724215f54a75c39d2ed40f2c502","access_level":"open_access","relation":"main_file","file_id":"10120"}],"article_processing_charge":"No","citation":{"short":"T. Rittig, D. Sumin, V. Babaei, P. Didyk, A. Voloboy, A. Wilkie, B. Bickel, K. Myszkowski, T. Weyrich, J. Křivánek, Computer Graphics Forum 40 (2021) 205–219.","mla":"Rittig, Tobias, et al. “Neural Acceleration of Scattering-Aware Color 3D Printing.” <i>Computer Graphics Forum</i>, vol. 40, no. 2, Wiley, 2021, pp. 205–19, doi:<a href=\"https://doi.org/10.1111/cgf.142626\">10.1111/cgf.142626</a>.","ama":"Rittig T, Sumin D, Babaei V, et al. Neural acceleration of scattering-aware color 3D printing. <i>Computer Graphics Forum</i>. 2021;40(2):205-219. doi:<a href=\"https://doi.org/10.1111/cgf.142626\">10.1111/cgf.142626</a>","ista":"Rittig T, Sumin D, Babaei V, Didyk P, Voloboy A, Wilkie A, Bickel B, Myszkowski K, Weyrich T, Křivánek J. 2021. Neural acceleration of scattering-aware color 3D printing. Computer Graphics Forum. 40(2), 205–219.","ieee":"T. Rittig <i>et al.</i>, “Neural acceleration of scattering-aware color 3D printing,” <i>Computer Graphics Forum</i>, vol. 40, no. 2. Wiley, pp. 205–219, 2021.","chicago":"Rittig, Tobias, Denis Sumin, Vahid Babaei, Piotr Didyk, Alexey Voloboy, Alexander Wilkie, Bernd Bickel, Karol Myszkowski, Tim Weyrich, and Jaroslav Křivánek. “Neural Acceleration of Scattering-Aware Color 3D Printing.” <i>Computer Graphics Forum</i>. Wiley, 2021. <a href=\"https://doi.org/10.1111/cgf.142626\">https://doi.org/10.1111/cgf.142626</a>.","apa":"Rittig, T., Sumin, D., Babaei, V., Didyk, P., Voloboy, A., Wilkie, A., … Křivánek, J. (2021). Neural acceleration of scattering-aware color 3D printing. <i>Computer Graphics Forum</i>. Wiley. <a href=\"https://doi.org/10.1111/cgf.142626\">https://doi.org/10.1111/cgf.142626</a>"},"day":"01","abstract":[{"text":"With the wider availability of full-color 3D printers, color-accurate 3D-print preparation has received increased attention. A key challenge lies in the inherent translucency of commonly used print materials that blurs out details of the color texture. Previous work tries to compensate for these scattering effects through strategic assignment of colored primary materials to printer voxels. To date, the highest-quality approach uses iterative optimization that relies on computationally expensive Monte Carlo light transport simulation to predict the surface appearance from subsurface scattering within a given print material distribution; that optimization, however, takes in the order of days on a single machine. In our work, we dramatically speed up the process by replacing the light transport simulation with a data-driven approach. Leveraging a deep neural network to predict the scattering within a highly heterogeneous medium, our method performs around two orders of magnitude faster than Monte Carlo rendering while yielding optimization results of similar quality level. The network is based on an established method from atmospheric cloud rendering, adapted to our domain and extended by a physically motivated weight sharing scheme that substantially reduces the network size. We analyze its performance in an end-to-end print preparation pipeline and compare quality and runtime to alternative approaches, and demonstrate its generalization to unseen geometry and material values. This for the first time enables full heterogenous material optimization for 3D-print preparation within time frames in the order of the actual printing time.","lang":"eng"}],"author":[{"first_name":"Tobias","full_name":"Rittig, Tobias","last_name":"Rittig"},{"last_name":"Sumin","full_name":"Sumin, Denis","first_name":"Denis"},{"last_name":"Babaei","first_name":"Vahid","full_name":"Babaei, Vahid"},{"first_name":"Piotr","full_name":"Didyk, Piotr","last_name":"Didyk"},{"last_name":"Voloboy","full_name":"Voloboy, Alexey","first_name":"Alexey"},{"full_name":"Wilkie, Alexander","first_name":"Alexander","last_name":"Wilkie"},{"id":"49876194-F248-11E8-B48F-1D18A9856A87","last_name":"Bickel","first_name":"Bernd","full_name":"Bickel, Bernd","orcid":"0000-0001-6511-9385"},{"last_name":"Myszkowski","full_name":"Myszkowski, Karol","first_name":"Karol"},{"last_name":"Weyrich","first_name":"Tim","full_name":"Weyrich, Tim"},{"last_name":"Křivánek","full_name":"Křivánek, Jaroslav","first_name":"Jaroslav"}],"oa":1,"date_published":"2021-05-01T00:00:00Z","acknowledgement":"We thank Sebastian Cucerca for processing and capturing the phys-cal printouts. This work was supported by the Charles University grant SVV-260588 and Czech Science Foundation grant 19-07626S. This project has received funding from the European Union’s Horizon 2020 research and innovation programme, under the Marie Skłodowska Curie grant agreements No 642841 (DISTRO) and No765911 (RealVision), and under the European Research Council grant agreement No 715767 (MATERIALIZABLE).","issue":"2","article_type":"original","doi":"10.1111/cgf.142626"},{"user_id":"ba8df636-2132-11f1-aed0-ed93e2281fdd","_id":"9819","oa_version":"Published Version","quality_controlled":"1","article_number":"44","date_updated":"2026-04-16T08:19:58Z","status":"public","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"publication_status":"published","volume":40,"month":"08","isi":1,"type":"journal_article","department":[{"_id":"BeBi"}],"scopus_import":"1","publication":"ACM Transactions on Graphics","language":[{"iso":"eng"}],"ddc":["000"],"file_date_updated":"2021-08-09T11:41:50Z","citation":{"ista":"Mallikarjun BR, Tewari A, Dib A, Weyrich T, Bickel B, Seidel HP, Pfister H, Matusik W, Chevallier L, Elgharib MA, Theobalt C. 2021. PhotoApp: Photorealistic appearance editing of head portraits. ACM Transactions on Graphics. 40(4), 44.","ieee":"B. R. Mallikarjun <i>et al.</i>, “PhotoApp: Photorealistic appearance editing of head portraits,” <i>ACM Transactions on Graphics</i>, vol. 40, no. 4. Association for Computing Machinery, 2021.","chicago":"Mallikarjun, B. R., Ayush Tewari, Abdallah Dib, Tim Weyrich, Bernd Bickel, Hans Peter Seidel, Hanspeter Pfister, et al. “PhotoApp: Photorealistic Appearance Editing of Head Portraits.” <i>ACM Transactions on Graphics</i>. Association for Computing Machinery, 2021. <a href=\"https://doi.org/10.1145/3450626.3459765\">https://doi.org/10.1145/3450626.3459765</a>.","apa":"Mallikarjun, B. R., Tewari, A., Dib, A., Weyrich, T., Bickel, B., Seidel, H. P., … Theobalt, C. (2021). PhotoApp: Photorealistic appearance editing of head portraits. <i>ACM Transactions on Graphics</i>. Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3450626.3459765\">https://doi.org/10.1145/3450626.3459765</a>","short":"B.R. Mallikarjun, A. Tewari, A. Dib, T. Weyrich, B. Bickel, H.P. Seidel, H. Pfister, W. Matusik, L. Chevallier, M.A. Elgharib, C. Theobalt, ACM Transactions on Graphics 40 (2021).","mla":"Mallikarjun, B. R., et al. “PhotoApp: Photorealistic Appearance Editing of Head Portraits.” <i>ACM Transactions on Graphics</i>, vol. 40, no. 4, 44, Association for Computing Machinery, 2021, doi:<a href=\"https://doi.org/10.1145/3450626.3459765\">10.1145/3450626.3459765</a>.","ama":"Mallikarjun BR, Tewari A, Dib A, et al. PhotoApp: Photorealistic appearance editing of head portraits. <i>ACM Transactions on Graphics</i>. 2021;40(4). doi:<a href=\"https://doi.org/10.1145/3450626.3459765\">10.1145/3450626.3459765</a>"},"publisher":"Association for Computing Machinery","article_processing_charge":"Yes (in subscription journal)","file":[{"file_id":"9834","checksum":"51b61b7e5c175e2d7ed8fa3b35f7525a","access_level":"open_access","relation":"main_file","content_type":"application/pdf","success":1,"file_name":"2021_ACMTransactionsOnGraphics_Mallikarjun.pdf","creator":"asandaue","file_size":49840741,"date_updated":"2021-08-09T11:41:50Z","date_created":"2021-08-09T11:41:50Z"}],"title":"PhotoApp: Photorealistic appearance editing of head portraits","has_accepted_license":"1","intvolume":"        40","year":"2021","date_created":"2021-08-08T22:01:27Z","publication_identifier":{"eissn":["1557-7368"],"issn":["0730-0301"]},"external_id":{"isi":["000674930900011"],"arxiv":["2103.07658"]},"article_type":"original","issue":"4","acknowledgement":"This work was supported by the ERC Consolidator Grant 4DReply (770784). We also acknowledge support from Technicolor and InterDigital. We thank Tiancheng Sun for kindly helping us with the comparisons with Sun et al. [2019].","doi":"10.1145/3450626.3459765","abstract":[{"text":"Photorealistic editing of head portraits is a challenging task as humans are very sensitive to inconsistencies in faces. We present an approach for high-quality intuitive editing of the camera viewpoint and scene illumination (parameterised with an environment map) in a portrait image. This requires our method to capture and control the full reflectance field of the person in the image. Most editing approaches rely on supervised learning using training data captured with setups such as light and camera stages. Such datasets are expensive to acquire, not readily available and do not capture all the rich variations of in-the-wild portrait images. In addition, most supervised approaches only focus on relighting, and do not allow camera viewpoint editing. Thus, they only capture and control a subset of the reflectance field. Recently, portrait editing has been demonstrated by operating in the generative model space of StyleGAN. While such approaches do not require direct supervision, there is a significant loss of quality when compared to the supervised approaches. In this paper, we present a method which learns from limited supervised training data. The training images only include people in a fixed neutral expression with eyes closed, without much hair or background variations. Each person is captured under 150 one-light-at-a-time conditions and under 8 camera poses. Instead of training directly in the image space, we design a supervised problem which learns transformations in the latent space of StyleGAN. This combines the best of supervised learning and generative adversarial modeling. We show that the StyleGAN prior allows for generalisation to different expressions, hairstyles and backgrounds. This produces high-quality photorealistic results for in-the-wild images and significantly outperforms existing methods. Our approach can edit the illumination and pose simultaneously, and runs at interactive rates.","lang":"eng"}],"day":"01","date_published":"2021-08-01T00:00:00Z","oa":1,"author":[{"last_name":"Mallikarjun","full_name":"Mallikarjun, B. R.","first_name":"B. R."},{"last_name":"Tewari","first_name":"Ayush","full_name":"Tewari, Ayush"},{"first_name":"Abdallah","full_name":"Dib, Abdallah","last_name":"Dib"},{"full_name":"Weyrich, Tim","first_name":"Tim","last_name":"Weyrich"},{"full_name":"Bickel, Bernd","first_name":"Bernd","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","last_name":"Bickel"},{"full_name":"Seidel, Hans Peter","first_name":"Hans Peter","last_name":"Seidel"},{"first_name":"Hanspeter","full_name":"Pfister, Hanspeter","last_name":"Pfister"},{"full_name":"Matusik, Wojciech","first_name":"Wojciech","last_name":"Matusik"},{"full_name":"Chevallier, Louis","first_name":"Louis","last_name":"Chevallier"},{"last_name":"Elgharib","full_name":"Elgharib, Mohamed A.","first_name":"Mohamed A."},{"last_name":"Theobalt","first_name":"Christian","full_name":"Theobalt, Christian"}],"arxiv":1},{"scopus_import":"1","type":"journal_article","department":[{"_id":"BeBi"}],"language":[{"iso":"eng"}],"publication":"ACM Transactions on Graphics","quality_controlled":"1","article_number":"125","oa_version":"Submitted Version","_id":"9820","user_id":"ba8df636-2132-11f1-aed0-ed93e2281fdd","volume":40,"publication_status":"published","month":"08","isi":1,"status":"public","date_updated":"2026-04-16T08:20:28Z","main_file_link":[{"open_access":"1","url":"https://zaguan.unizar.es/record/110704/files/texto_completo.pdf"}],"doi":"10.1145/3450626.3459813","article_type":"original","issue":"4","acknowledgement":"This project has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie, grant agreement Nº 765911 (RealVision) and from the European Research Council (ERC), grant agreement Nº 804226 (PERDY).","date_published":"2021-08-01T00:00:00Z","oa":1,"author":[{"first_name":"Ana","full_name":"Serrano, Ana","last_name":"Serrano"},{"last_name":"Chen","full_name":"Chen, Bin","first_name":"Bin"},{"first_name":"Chao","full_name":"Wang, Chao","last_name":"Wang"},{"orcid":"0000-0002-5062-4474","first_name":"Michael","full_name":"Piovarci, Michael","last_name":"Piovarci","id":"62E473F4-5C99-11EA-A40E-AF823DDC885E"},{"full_name":"Seidel, Hans Peter","first_name":"Hans Peter","last_name":"Seidel"},{"last_name":"Didyk","first_name":"Piotr","full_name":"Didyk, Piotr"},{"last_name":"Myszkowski","full_name":"Myszkowski, Karol","first_name":"Karol"}],"abstract":[{"text":"Material appearance hinges on material reflectance properties but also surface geometry and illumination. The unlimited number of potential combinations between these factors makes understanding and predicting material appearance a very challenging task. In this work, we collect a large-scale dataset of perceptual ratings of appearance attributes with more than 215,680 responses for 42,120 distinct combinations of material, shape, and illumination. The goal of this dataset is twofold. First, we analyze for the first time the effects of illumination and geometry in material perception across such a large collection of varied appearances. We connect our findings to those of the literature, discussing how previous knowledge generalizes across very diverse materials, shapes, and illuminations. Second, we use the collected dataset to train a deep learning architecture for predicting perceptual attributes that correlate with human judgments. We demonstrate the consistent and robust behavior of our predictor in various challenging scenarios, which, for the first time, enables estimating perceived material attributes from general 2D images. Since our predictor relies on the final appearance in an image, it can compare appearance properties across different geometries and illumination conditions. Finally, we demonstrate several applications that use our predictor, including appearance reproduction using 3D printing, BRDF editing by integrating our predictor in a differentiable renderer, illumination design, or material recommendations for scene design.","lang":"eng"}],"day":"01","citation":{"ieee":"A. Serrano <i>et al.</i>, “The effect of shape and illumination on material perception: Model and applications,” <i>ACM Transactions on Graphics</i>, vol. 40, no. 4. Association for Computing Machinery, 2021.","ista":"Serrano A, Chen B, Wang C, Piovarci M, Seidel HP, Didyk P, Myszkowski K. 2021. The effect of shape and illumination on material perception: Model and applications. ACM Transactions on Graphics. 40(4), 125.","apa":"Serrano, A., Chen, B., Wang, C., Piovarci, M., Seidel, H. P., Didyk, P., &#38; Myszkowski, K. (2021). The effect of shape and illumination on material perception: Model and applications. <i>ACM Transactions on Graphics</i>. Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3450626.3459813\">https://doi.org/10.1145/3450626.3459813</a>","chicago":"Serrano, Ana, Bin Chen, Chao Wang, Michael Piovarci, Hans Peter Seidel, Piotr Didyk, and Karol Myszkowski. “The Effect of Shape and Illumination on Material Perception: Model and Applications.” <i>ACM Transactions on Graphics</i>. Association for Computing Machinery, 2021. <a href=\"https://doi.org/10.1145/3450626.3459813\">https://doi.org/10.1145/3450626.3459813</a>.","short":"A. Serrano, B. Chen, C. Wang, M. Piovarci, H.P. Seidel, P. Didyk, K. Myszkowski, ACM Transactions on Graphics 40 (2021).","ama":"Serrano A, Chen B, Wang C, et al. The effect of shape and illumination on material perception: Model and applications. <i>ACM Transactions on Graphics</i>. 2021;40(4). doi:<a href=\"https://doi.org/10.1145/3450626.3459813\">10.1145/3450626.3459813</a>","mla":"Serrano, Ana, et al. “The Effect of Shape and Illumination on Material Perception: Model and Applications.” <i>ACM Transactions on Graphics</i>, vol. 40, no. 4, 125, Association for Computing Machinery, 2021, doi:<a href=\"https://doi.org/10.1145/3450626.3459813\">10.1145/3450626.3459813</a>."},"publisher":"Association for Computing Machinery","article_processing_charge":"No","intvolume":"        40","date_created":"2021-08-08T22:01:28Z","year":"2021","publication_identifier":{"eissn":["1557-7368"],"issn":["0730-0301"]},"external_id":{"isi":["000674930900090"]},"title":"The effect of shape and illumination on material perception: Model and applications"},{"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","_id":"9957","page":"4791-4800","oa_version":"Preprint","quality_controlled":"1","date_updated":"2023-08-11T11:08:35Z","status":"public","month":"09","publication_status":"published","isi":1,"type":"conference","department":[{"_id":"BeBi"}],"scopus_import":"1","publication":"Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition","language":[{"iso":"eng"}],"ddc":["000"],"file_date_updated":"2021-08-24T06:02:15Z","citation":{"apa":"B R, M., Tewari, A., Oh, T.-H., Weyrich, T., Bickel, B., Seidel, H.-P., … Theobalt, C. (2021). Monocular reconstruction of neural face reflectance fields. In <i>Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition</i> (pp. 4791–4800). Nashville, TN, United States; Virtual: IEEE. <a href=\"https://doi.org/10.1109/CVPR46437.2021.00476\">https://doi.org/10.1109/CVPR46437.2021.00476</a>","chicago":"B R, Mallikarjun, Ayush Tewari, Tae-Hyun Oh, Tim Weyrich, Bernd Bickel, Hans-Peter Seidel, Hanspeter Pfister, Wojciech Matusik, Mohamed Elgharib, and Christian Theobalt. “Monocular Reconstruction of Neural Face Reflectance Fields.” In <i>Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition</i>, 4791–4800. IEEE, 2021. <a href=\"https://doi.org/10.1109/CVPR46437.2021.00476\">https://doi.org/10.1109/CVPR46437.2021.00476</a>.","ieee":"M. B R <i>et al.</i>, “Monocular reconstruction of neural face reflectance fields,” in <i>Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition</i>, Nashville, TN, United States; Virtual, 2021, pp. 4791–4800.","ista":"B R M, Tewari A, Oh T-H, Weyrich T, Bickel B, Seidel H-P, Pfister H, Matusik W, Elgharib M, Theobalt C. 2021. Monocular reconstruction of neural face reflectance fields. Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition. CVPR: Conference on Computer Vision and Pattern Recognition, 4791–4800.","mla":"B R, Mallikarjun, et al. “Monocular Reconstruction of Neural Face Reflectance Fields.” <i>Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition</i>, IEEE, 2021, pp. 4791–800, doi:<a href=\"https://doi.org/10.1109/CVPR46437.2021.00476\">10.1109/CVPR46437.2021.00476</a>.","ama":"B R M, Tewari A, Oh T-H, et al. Monocular reconstruction of neural face reflectance fields. In: <i>Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition</i>. IEEE; 2021:4791-4800. doi:<a href=\"https://doi.org/10.1109/CVPR46437.2021.00476\">10.1109/CVPR46437.2021.00476</a>","short":"M. B R, A. Tewari, T.-H. Oh, T. Weyrich, B. Bickel, H.-P. Seidel, H. Pfister, W. Matusik, M. Elgharib, C. Theobalt, in:, Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition, IEEE, 2021, pp. 4791–4800."},"article_processing_charge":"No","publisher":"IEEE","file":[{"content_type":"application/pdf","file_name":"R_Monocular_Reconstruction_of_Neural_Face_Reflectance_Fields_CVPR_2021_paper[1].pdf","creator":"bbickel","date_updated":"2021-08-24T06:02:15Z","file_size":4746649,"date_created":"2021-08-24T06:02:15Z","file_id":"9958","access_level":"open_access","checksum":"961db0bde76dd87cf833930080bb9f38","relation":"main_file"}],"title":"Monocular reconstruction of neural face reflectance fields","has_accepted_license":"1","date_created":"2021-08-24T06:03:00Z","year":"2021","publication_identifier":{"isbn":["978-166544509-2"],"issn":["1063-6919"]},"external_id":{"isi":["000739917304096"],"arxiv":["2008.10247"]},"acknowledgement":"We thank Tarun Yenamandra and Duarte David for helping us with the comparisons. This work was supported by the\r\nERC Consolidator Grant 4DReply (770784). We also acknowledge support from InterDigital.","doi":"10.1109/CVPR46437.2021.00476","conference":{"location":"Nashville, TN, United States; Virtual","start_date":"2021-06-20","end_date":"2021-06-25","name":"CVPR: Conference on Computer Vision and Pattern Recognition"},"abstract":[{"text":"The reflectance field of a face describes the reflectance properties responsible for complex lighting effects including diffuse, specular, inter-reflection and self shadowing. Most existing methods for estimating the face reflectance from a monocular image assume faces to be diffuse with very few approaches adding a specular component. This still leaves out important perceptual aspects of reflectance as higher-order global illumination effects and self-shadowing are not modeled. We present a new neural representation for face reflectance where we can estimate all components of the reflectance responsible for the final appearance from a single monocular image. Instead of modeling each component of the reflectance separately using parametric models, our neural representation allows us to generate a basis set of faces in a geometric deformation-invariant space, parameterized by the input light direction, viewpoint and face geometry. We learn to reconstruct this reflectance field of a face just from a monocular image, which can be used to render the face from any viewpoint in any light condition. Our method is trained on a light-stage training dataset, which captures 300 people illuminated with 150 light conditions from 8 viewpoints. We show that our method outperforms existing monocular reflectance reconstruction methods, in terms of photorealism due to better capturing of physical premitives, such as sub-surface scattering, specularities, self-shadows and other higher-order effects.","lang":"eng"}],"day":"01","date_published":"2021-09-01T00:00:00Z","oa":1,"arxiv":1,"author":[{"last_name":"B R","full_name":"B R, Mallikarjun","first_name":"Mallikarjun"},{"last_name":"Tewari","full_name":"Tewari, Ayush","first_name":"Ayush"},{"last_name":"Oh","full_name":"Oh, Tae-Hyun","first_name":"Tae-Hyun"},{"last_name":"Weyrich","full_name":"Weyrich, Tim","first_name":"Tim"},{"id":"49876194-F248-11E8-B48F-1D18A9856A87","last_name":"Bickel","first_name":"Bernd","full_name":"Bickel, Bernd","orcid":"0000-0001-6511-9385"},{"first_name":"Hans-Peter","full_name":"Seidel, Hans-Peter","last_name":"Seidel"},{"full_name":"Pfister, Hanspeter","first_name":"Hanspeter","last_name":"Pfister"},{"full_name":"Matusik, Wojciech","first_name":"Wojciech","last_name":"Matusik"},{"last_name":"Elgharib","first_name":"Mohamed","full_name":"Elgharib, Mohamed"},{"last_name":"Theobalt","first_name":"Christian","full_name":"Theobalt, Christian"}]},{"file_date_updated":"2021-10-18T10:42:22Z","ddc":["516"],"publisher":"Association for Computing Machinery","article_processing_charge":"No","file":[{"file_id":"10150","relation":"main_file","access_level":"open_access","checksum":"7e5d08ce46b0451b3102eacd3d00f85f","file_size":17064290,"date_updated":"2021-10-18T10:42:15Z","success":1,"file_name":"elastic-curves-paper.pdf","creator":"chafner","content_type":"application/pdf","date_created":"2021-10-18T10:42:15Z"},{"date_created":"2021-10-18T10:42:22Z","file_size":547156,"date_updated":"2021-10-18T10:42:22Z","content_type":"application/pdf","creator":"chafner","file_name":"elastic-curves-supp.pdf","access_level":"open_access","checksum":"0088643478be7c01a703b5b10767348f","relation":"supplementary_material","file_id":"10151"}],"citation":{"short":"C. Hafner, B. Bickel, ACM Transactions on Graphics 40 (2021).","ama":"Hafner C, Bickel B. The design space of plane elastic curves. <i>ACM Transactions on Graphics</i>. 2021;40(4). doi:<a href=\"https://doi.org/10.1145/3450626.3459800\">10.1145/3450626.3459800</a>","mla":"Hafner, Christian, and Bernd Bickel. “The Design Space of Plane Elastic Curves.” <i>ACM Transactions on Graphics</i>, vol. 40, no. 4, 126, Association for Computing Machinery, 2021, doi:<a href=\"https://doi.org/10.1145/3450626.3459800\">10.1145/3450626.3459800</a>.","ieee":"C. Hafner and B. Bickel, “The design space of plane elastic curves,” <i>ACM Transactions on Graphics</i>, vol. 40, no. 4. Association for Computing Machinery, 2021.","ista":"Hafner C, Bickel B. 2021. The design space of plane elastic curves. ACM Transactions on Graphics. 40(4), 126.","chicago":"Hafner, Christian, and Bernd Bickel. “The Design Space of Plane Elastic Curves.” <i>ACM Transactions on Graphics</i>. Association for Computing Machinery, 2021. <a href=\"https://doi.org/10.1145/3450626.3459800\">https://doi.org/10.1145/3450626.3459800</a>.","apa":"Hafner, C., &#38; Bickel, B. (2021). The design space of plane elastic curves. <i>ACM Transactions on Graphics</i>. Virtual: Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3450626.3459800\">https://doi.org/10.1145/3450626.3459800</a>"},"has_accepted_license":"1","title":"The design space of plane elastic curves","external_id":{"isi":["000674930900091"]},"publication_identifier":{"eissn":["1557-7368"],"issn":["0730-0301"]},"year":"2021","date_created":"2021-08-08T22:01:26Z","intvolume":"        40","acknowledgement":"We thank the anonymous reviewers for their generous feedback, and Michal Piovarči for his help in producing the supplemental video. This project has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No 715767).\r\n","issue":"4","article_type":"original","doi":"10.1145/3450626.3459800","day":"19","conference":{"location":"Virtual","start_date":"2021-08-09","name":"SIGGRAF: Special Interest Group on Computer Graphics and Interactive Techniques","end_date":"2021-08-13"},"abstract":[{"text":"Elastic bending of initially flat slender elements allows the realization and economic fabrication of intriguing curved shapes. In this work, we derive an intuitive but rigorous geometric characterization of the design space of plane elastic rods with variable stiffness. It enables designers to determine which shapes are physically viable with active bending by visual inspection alone. Building on these insights, we propose a method for efficiently designing the geometry of a flat elastic rod that realizes a target equilibrium curve, which only requires solving a linear program. We implement this method in an interactive computational design tool that gives feedback about the feasibility of a design, and computes the geometry of the structural elements necessary to realize it within an instant. The tool also offers an iterative optimization routine that improves the fabricability of a model while modifying it as little as possible. In addition, we use our geometric characterization to derive an algorithm for analyzing and recovering the stability of elastic curves that would otherwise snap out of their unstable equilibrium shapes by buckling. We show the efficacy of our approach by designing and manufacturing several physical models that are assembled from flat elements.","lang":"eng"}],"author":[{"id":"400429CC-F248-11E8-B48F-1D18A9856A87","last_name":"Hafner","full_name":"Hafner, Christian","first_name":"Christian"},{"full_name":"Bickel, Bernd","first_name":"Bernd","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","last_name":"Bickel"}],"oa":1,"date_published":"2021-07-19T00:00:00Z","oa_version":"Published Version","_id":"9817","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","related_material":{"link":[{"url":"https://ist.ac.at/en/news/designing-with-elastic-structures/","description":"News on IST Website","relation":"press_release"}],"record":[{"relation":"dissertation_contains","status":"public","id":"12897"}]},"article_number":"126","quality_controlled":"1","tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"status":"public","date_updated":"2026-07-03T22:30:38Z","isi":1,"publication_status":"published","month":"07","volume":40,"department":[{"_id":"BeBi"}],"type":"journal_article","scopus_import":"1","ec_funded":1,"project":[{"grant_number":"715767","call_identifier":"H2020","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling","_id":"24F9549A-B435-11E9-9278-68D0E5697425"}],"publication":"ACM Transactions on Graphics","keyword":["Computing methodologies","shape modeling","modeling and simulation","theory of computation","computational geometry","mathematics of computing","mathematical optimization"],"language":[{"iso":"eng"}]},{"supervisor":[{"full_name":"Bickel, Bernd","first_name":"Bernd","orcid":"0000-0001-6511-9385","id":"49876194-F248-11E8-B48F-1D18A9856A87","last_name":"Bickel"}],"corr_author":"1","ec_funded":1,"alternative_title":["ISTA Thesis"],"department":[{"_id":"BeBi"}],"OA_place":"publisher","type":"dissertation","language":[{"iso":"eng"}],"project":[{"grant_number":"715767","call_identifier":"H2020","_id":"24F9549A-B435-11E9-9278-68D0E5697425","name":"MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling"}],"keyword":["computer-aided design","shape modeling","self-morphing","mechanical engineering"],"related_material":{"record":[{"status":"public","id":"8562","relation":"part_of_dissertation"},{"status":"public","id":"8375","relation":"research_data"},{"relation":"research_data","status":"deleted","id":"7151"},{"id":"1001","status":"public","relation":"part_of_dissertation"},{"id":"7262","status":"public","relation":"part_of_dissertation"}]},"acknowledged_ssus":[{"_id":"M-Shop"},{"_id":"ScienComp"}],"_id":"8366","oa_version":"Published Version","page":"118","user_id":"ba8df636-2132-11f1-aed0-ed93e2281fdd","publication_status":"published","month":"09","degree_awarded":"PhD","status":"public","date_updated":"2026-04-08T07:25:22Z","doi":"10.15479/AT:ISTA:8366","acknowledgement":"During the work on this thesis, I received substantial support from IST Austria’s scientific service units. A big thank you to Todor Asenov and other Miba Machine Shop team members for their help with fabrication of experimental prototypes. In addition, I would like to thank Scientific Computing team for the support with high performance computing.\r\nFinancial support was provided by the European Research Council (ERC) under grant agreement No 715767 - MATERIALIZABLE: Intelligent fabrication-oriented Computational Design and Modeling, which I gratefully acknowledge.","oa":1,"author":[{"orcid":"0000-0001-9819-5077","full_name":"Guseinov, Ruslan","first_name":"Ruslan","last_name":"Guseinov","id":"3AB45EE2-F248-11E8-B48F-1D18A9856A87"}],"date_published":"2020-09-21T00:00:00Z","day":"21","abstract":[{"lang":"eng","text":"Fabrication of curved shells plays an important role in modern design, industry, and science. Among their remarkable properties are, for example, aesthetics of organic shapes, ability to evenly distribute loads, or efficient flow separation. They find applications across vast length scales ranging from sky-scraper architecture to microscopic devices. But, at\r\nthe same time, the design of curved shells and their manufacturing process pose a variety of challenges. In this thesis, they are addressed from several perspectives. In particular, this thesis presents approaches based on the transformation of initially flat sheets into the target curved surfaces. This involves problems of interactive design of shells with nontrivial mechanical constraints, inverse design of complex structural materials, and data-driven modeling of delicate and time-dependent physical properties. At the same time, two newly-developed self-morphing mechanisms targeting flat-to-curved transformation are presented.\r\nIn architecture, doubly curved surfaces can be realized as cold bent glass panelizations. Originally flat glass panels are bent into frames and remain stressed. This is a cost-efficient fabrication approach compared to hot bending, when glass panels are shaped plastically. However such constructions are prone to breaking during bending, and it is highly\r\nnontrivial to navigate the design space, keeping the panels fabricable and aesthetically pleasing at the same time. We introduce an interactive design system for cold bent glass façades, while previously even offline optimization for such scenarios has not been sufficiently developed. Our method is based on a deep learning approach providing quick\r\nand high precision estimation of glass panel shape and stress while handling the shape\r\nmultimodality.\r\nFabrication of smaller objects of scales below 1 m, can also greatly benefit from shaping originally flat sheets. In this respect, we designed new self-morphing shell mechanisms transforming from an initial flat state to a doubly curved state with high precision and detail. Our so-called CurveUps demonstrate the encodement of the geometric information\r\ninto the shell. Furthermore, we explored the frontiers of programmable materials and showed how temporal information can additionally be encoded into a flat shell. This allows prescribing deformation sequences for doubly curved surfaces and, thus, facilitates self-collision avoidance enabling complex shapes and functionalities otherwise impossible.\r\nBoth of these methods include inverse design tools keeping the user in the design loop."}],"article_processing_charge":"No","file":[{"file_id":"8367","relation":"main_file","checksum":"f8da89553da36037296b0a80f14ebf50","access_level":"open_access","file_size":70950442,"date_updated":"2020-09-10T16:11:49Z","creator":"rguseino","success":1,"file_name":"thesis_rguseinov.pdf","content_type":"application/pdf","date_created":"2020-09-10T16:11:49Z"},{"access_level":"closed","checksum":"e8fd944c960c20e0e27e6548af69121d","relation":"source_file","file_id":"8374","date_created":"2020-09-11T09:39:48Z","file_size":76207597,"date_updated":"2020-09-16T15:11:01Z","content_type":"application/x-zip-compressed","creator":"rguseino","file_name":"thesis_source.zip"}],"publisher":"Institute of Science and Technology Austria","citation":{"ista":"Guseinov R. 2020. Computational design of curved thin shells: From glass façades to programmable matter. Institute of Science and Technology Austria.","ieee":"R. Guseinov, “Computational design of curved thin shells: From glass façades to programmable matter,” Institute of Science and Technology Austria, 2020.","apa":"Guseinov, R. (2020). <i>Computational design of curved thin shells: From glass façades to programmable matter</i>. Institute of Science and Technology Austria. <a href=\"https://doi.org/10.15479/AT:ISTA:8366\">https://doi.org/10.15479/AT:ISTA:8366</a>","chicago":"Guseinov, Ruslan. “Computational Design of Curved Thin Shells: From Glass Façades to Programmable Matter.” Institute of Science and Technology Austria, 2020. <a href=\"https://doi.org/10.15479/AT:ISTA:8366\">https://doi.org/10.15479/AT:ISTA:8366</a>.","short":"R. Guseinov, Computational Design of Curved Thin Shells: From Glass Façades to Programmable Matter, Institute of Science and Technology Austria, 2020.","ama":"Guseinov R. Computational design of curved thin shells: From glass façades to programmable matter. 2020. doi:<a href=\"https://doi.org/10.15479/AT:ISTA:8366\">10.15479/AT:ISTA:8366</a>","mla":"Guseinov, Ruslan. <i>Computational Design of Curved Thin Shells: From Glass Façades to Programmable Matter</i>. 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Guseinov, “Supplementary data for ‘Computational design of curved thin shells: from glass façades to programmable matter.’” Institute of Science and Technology Austria, 2020.","ista":"Guseinov R. 2020. Supplementary data for ‘Computational design of curved thin shells: from glass façades to programmable matter’, Institute of Science and Technology Austria, <a href=\"https://doi.org/10.15479/AT:ISTA:8375\">10.15479/AT:ISTA:8375</a>."}}]