Anisotropic Specular Image-Based Lighting Based on BRDF Major Axis Sampling

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dc.contributor.authorCocco, Giovannien_US
dc.contributor.authorZanni, Cédricen_US
dc.contributor.authorChermain, Xavieren_US
dc.contributor.editorChen, Renjieen_US
dc.contributor.editorRitschel, Tobiasen_US
dc.contributor.editorWhiting, Emilyen_US
dc.date.accessioned2024-10-13T18:08:43Z
dc.date.available2024-10-13T18:08:43Z
dc.date.issued2024
dc.description.abstractAnisotropic specular appearances are ubiquitous in the environment: brushed stainless steel pans, kettles, elevator walls, fur, or scratched plastics. Real-time rendering of these materials with image-based lighting is challenging due to the complex shape of the bidirectional reflectance distribution function (BRDF). We propose an anisotropic specular image-based lighting method that can serve as a drop-in replacement for the standard bent normal technique [Rev11]. Our method yields more realistic results with a 50% increase in computation time of the previous technique, using the same high dynamic range (HDR) preintegrated environment image. We use several environment samples positioned along the major axis of the specular microfacet BRDF. We derive an analytic formula to determine the two closest and two farthest points from the reflected direction on an approximation of the BRDF confidence region boundary. The two farthest points define the BRDF major axis, while the two closest points are used to approximate the BRDF width. The environment level of detail is derived from the BRDF width and the distance between the samples. We extensively compare our method with the bent normal technique and the ground truth using the GGX specular BRDF.en_US
dc.description.number7
dc.description.sectionheadersRendering and Lighting II
dc.description.seriesinformationComputer Graphics Forum
dc.description.volume43
dc.identifier.doi10.1111/cgf.15233
dc.identifier.issn1467-8659
dc.identifier.pages12 pages
dc.identifier.urihttps://doi.org/10.1111/cgf.15233
dc.identifier.urihttps://diglib.eg.org/handle/10.1111/cgf15233
dc.publisherThe Eurographics Association and John Wiley & Sons Ltd.en_US
dc.subjectCCS Concepts: Computing methodologies → Reflectance modeling
dc.subjectComputing methodologies → Reflectance modeling
dc.titleAnisotropic Specular Image-Based Lighting Based on BRDF Major Axis Samplingen_US
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