Print Email Facebook Twitter Effects of light map orientation and shape on the visual perception of canonical materials Title Effects of light map orientation and shape on the visual perception of canonical materials Author Zhang, F. (TU Delft Human Information Communication Design) de Ridder, H. (TU Delft Human Information Communication Design) Barla, Pascal (INRIA Bordeaux Sud-Ouest) Pont, S.C. (TU Delft Human Information Communication Design) Date 2020 Abstract We previously presented a systematic optics-based canonical approach to test material-lighting interactions in their full natural ecology, combining canonical material and lighting modes. Analyzing the power of the spherical harmonics components of the lighting allowed us to predict the lighting effects on material perception for generic natural illumination environments. To further understand how material properties can be brought out or communicated visually, in the current study, we tested whether and how light map orientation and shape affect these interactions in a rating experiment: For combinations of four materials, three shapes, and three light maps, we rotated the light maps in 15 different configurations. For the velvety objects, there were main and interaction effects of lighting and light map orientation. The velvety ratings decreased when the main light source was coming from the back of the objects. For the specular objects, there were main and interaction effects of lighting and shape. The specular ratings increased when the environment in the specular reflections was clearly visible in the stimuli. For the glittery objects, there were main and interaction effects of shape and light map orientation. The glittery ratings correlated with the coverage of the glitter reflections as the shape and light map orientation varied. For the matte objects, results were robust across all conditions. Last, we propose combining the canonical modes approach with so-called importance maps to analyze the appearance features of the proximal stimulus, the image, in contradistinction to the physical parameters as an approach for optimization of material communication. Subject Canonical modesLight map orientationLightingMaterial communicationMaterial perceptionShapeOA-Fund TU Delft To reference this document use: http://resolver.tudelft.nl/uuid:216bfc27-eb74-4c5b-8a06-9d29d6dcebaa DOI https://doi.org/10.1167/jov.20.4.13 ISSN 1534-7362 Source Journal of vision, 20 (4), 18 Part of collection Institutional Repository Document type journal article Rights © 2020 F. Zhang, H. de Ridder, Pascal Barla, S.C. Pont Files PDF i0035_8711_366_1_06665.pdf 3.91 MB Close viewer /islandora/object/uuid:216bfc27-eb74-4c5b-8a06-9d29d6dcebaa/datastream/OBJ/view