--- res: bibo_abstract: - "We propose a computational design approach for covering a surface with individually addressable RGB LEDs, effectively forming a low-resolution surface screen. To achieve a low-cost and scalable approach, we propose creating designs from flat PCB panels bent in-place along the surface of a 3D printed core. Working with standard rigid PCBs enables the use of\r\nestablished PCB manufacturing services, allowing the fabrication of designs with several hundred LEDs. \r\nOur approach optimizes the PCB geometry for folding, and then jointly optimizes the LED packing, circuit and routing, solving a challenging layout problem under strict manufacturing requirements. Unlike paper, PCBs cannot bend beyond a certain point without breaking. Therefore, we introduce parametric cut patterns acting as hinges, designed to allow bending while remaining compact. To tackle the joint optimization of placement, circuit and routing, we propose a specialized algorithm that splits the global problem into one sub-problem per triangle, which is then individually solved.\r\nOur technique generates PCB blueprints in a completely automated way. After being fabricated by a PCB manufacturing service, the boards are bent and glued by the user onto the 3D printed support. We demonstrate our technique on a range of physical models and virtual examples, creating intricate surface light patterns from hundreds of LEDs.@eng" bibo_authorlist: - foaf_Person: foaf_givenName: Marco foaf_name: Freire, Marco foaf_surname: Freire - foaf_Person: foaf_givenName: Manas foaf_name: Bhargava, Manas foaf_surname: Bhargava foaf_workInfoHomepage: http://www.librecat.org/personId=FF8FA64C-AA6A-11E9-99AD-50D4E5697425 orcid: 0009-0007-6138-6890 - foaf_Person: foaf_givenName: Camille foaf_name: Schreck, Camille foaf_surname: Schreck foaf_workInfoHomepage: http://www.librecat.org/personId=2B14B676-F248-11E8-B48F-1D18A9856A87 - foaf_Person: foaf_givenName: Pierre-Alexandre foaf_name: Hugron, Pierre-Alexandre foaf_surname: Hugron - foaf_Person: foaf_givenName: Bernd foaf_name: Bickel, Bernd foaf_surname: Bickel foaf_workInfoHomepage: http://www.librecat.org/personId=49876194-F248-11E8-B48F-1D18A9856A87 orcid: 0000-0001-6511-9385 - foaf_Person: foaf_givenName: Sylvain foaf_name: Lefebvre, Sylvain foaf_surname: Lefebvre bibo_doi: 10.1145/3592411 bibo_issue: '4' bibo_volume: 42 dct_date: 2023^xs_gYear dct_identifier: - UT:001044671300108 dct_isPartOf: - http://id.crossref.org/issn/0730-0301 - http://id.crossref.org/issn/1557-7368 dct_language: eng dct_publisher: Association for Computing Machinery@ dct_subject: - PCB design and layout - Mesh geometry models dct_title: 'PCBend: Light up your 3D shapes with foldable circuit boards@' ...