Tag Archives: PBR

Comparing Microfacet Multiple Scattering with Real-Life Measurements

Posted on August 11, 2019 by Krzysztof Narkowicz

Microfacet multiple scattering approximations change content authoring – both for good (energy conservation) and for not so good (saturation changes with roughness). I was curious how current microfacet multiple scattering techniques compare against a measured real-life reference. After all, real-life surfaces … Continue reading →

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Cloth Shading

Posted on January 4, 2018 by Krzysztof Narkowicz

Over the holiday break I had some time to play with interesting ideas presented during the last SIGGRAPH. One thing which caught my attention was new analytical cloth BRDF from Sony Pictures Imageworks [EK17], which they use in movie production. … Continue reading →

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Analytical DFG Term for IBL

Posted on December 27, 2014 by Krzysztof Narkowicz

Image-based lighting is an important part of a physically based rendering. Unfortunately straightforward IBL implementation for more complicated lighting models than Phong requires a huge lookup table and isn’t practical for real time. Current state of the art approach is … Continue reading →

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Unreal Engine 4 gaussian specular normalization

Posted on October 6, 2012 by Krzysztof Narkowicz

Recently Epic did a nice presentation about their new tech: “The technology behind Unreal 4 Elemental demo“. Among a lot of impressive stuff they showed their gaussian specular aproximation. Here is a BRDF with U4 specular for Disney’s BRDF explorer: This … Continue reading →

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