{"date_updated":"2023-09-05T07:22:03Z","main_file_link":[{"url":"https://doi.org/10.48550/arXiv.2305.05944","open_access":"1"}],"acknowledgement":"The authors would like to thank Yuki Koyama and Takeo Igarashi for early discussions, and Yuta Yaguchi for support in 3D printing. This research is partially supported by the Israel Science Foundation grant number 1390/19.\r\n","conference":{"end_date":"2023-08-10","name":"SIGGRAPH: Computer Graphics and Interactive Techniques Conference","location":"Los Angeles, CA, United States","start_date":"2023-08-06"},"citation":{"ama":"Tojo K, Shamir A, Bickel B, Umetani N. Stealth shaper: Reflectivity optimization as surface stylization. In: <i>SIGGRAPH 2023 Conference Proceedings</i>. Association for Computing Machinery; 2023. doi:<a href=\"https://doi.org/10.1145/3588432.3591542\">10.1145/3588432.3591542</a>","ieee":"K. Tojo, A. Shamir, B. Bickel, and N. Umetani, “Stealth shaper: Reflectivity optimization as surface stylization,” in <i>SIGGRAPH 2023 Conference Proceedings</i>, Los Angeles, CA, United States, 2023.","apa":"Tojo, K., Shamir, A., Bickel, B., &#38; Umetani, N. (2023). Stealth shaper: Reflectivity optimization as surface stylization. In <i>SIGGRAPH 2023 Conference Proceedings</i>. Los Angeles, CA, United States: Association for Computing Machinery. <a href=\"https://doi.org/10.1145/3588432.3591542\">https://doi.org/10.1145/3588432.3591542</a>","chicago":"Tojo, Kenji, Ariel Shamir, Bernd Bickel, and Nobuyuki Umetani. “Stealth Shaper: Reflectivity Optimization as Surface Stylization.” In <i>SIGGRAPH 2023 Conference Proceedings</i>. Association for Computing Machinery, 2023. <a href=\"https://doi.org/10.1145/3588432.3591542\">https://doi.org/10.1145/3588432.3591542</a>.","ista":"Tojo K, Shamir A, Bickel B, Umetani N. 2023. Stealth shaper: Reflectivity optimization as surface stylization. SIGGRAPH 2023 Conference Proceedings. SIGGRAPH: Computer Graphics and Interactive Techniques Conference, 20.","short":"K. Tojo, A. Shamir, B. Bickel, N. Umetani, in:, SIGGRAPH 2023 Conference Proceedings, Association for Computing Machinery, 2023.","mla":"Tojo, Kenji, et al. “Stealth Shaper: Reflectivity Optimization as Surface Stylization.” <i>SIGGRAPH 2023 Conference Proceedings</i>, 20, Association for Computing Machinery, 2023, doi:<a href=\"https://doi.org/10.1145/3588432.3591542\">10.1145/3588432.3591542</a>."},"doi":"10.1145/3588432.3591542","type":"conference","title":"Stealth shaper: Reflectivity optimization as surface stylization","quality_controlled":"1","abstract":[{"text":"We present a technique to optimize the reflectivity of a surface while preserving its overall shape. The naïve optimization of the mesh vertices using the gradients of reflectivity simulations results in undesirable distortion. In contrast, our robust formulation optimizes the surface normal as an independent variable that bridges the reflectivity term with differential rendering, and the regularization term with as-rigid-as-possible elastic energy. We further adaptively subdivide the input mesh to improve the convergence. Consequently, our method can minimize the retroreflectivity of a wide range of input shapes, resulting in sharply creased shapes ubiquitous among stealth aircraft and Sci-Fi vehicles. Furthermore, by changing the reward for the direction of the outgoing light directions, our method can be applied to other reflectivity design tasks, such as the optimization of architectural walls to concentrate light in a specific region. We have tested the proposed method using light-transport simulations and real-world 3D-printed objects.","lang":"eng"}],"department":[{"_id":"BeBi"}],"year":"2023","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","oa":1,"status":"public","day":"23","_id":"14241","publication":"SIGGRAPH 2023 Conference Proceedings","scopus_import":"1","date_created":"2023-08-27T22:01:17Z","external_id":{"arxiv":["2305.05944"]},"language":[{"iso":"eng"}],"publisher":"Association for Computing Machinery","author":[{"last_name":"Tojo","full_name":"Tojo, Kenji","first_name":"Kenji"},{"full_name":"Shamir, Ariel","first_name":"Ariel","last_name":"Shamir"},{"last_name":"Bickel","id":"49876194-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-6511-9385","full_name":"Bickel, Bernd","first_name":"Bernd"},{"first_name":"Nobuyuki","full_name":"Umetani, Nobuyuki","last_name":"Umetani"}],"oa_version":"Preprint","month":"07","publication_identifier":{"isbn":["9798400701597"]},"article_number":"20","publication_status":"published","date_published":"2023-07-23T00:00:00Z","article_processing_charge":"No"}