Rendering fur with three dimensional textures
SIGGRAPH '89 Proceedings of the 16th annual conference on Computer graphics and interactive techniques
Quick image-based lighting of hair
SIGGRAPH '04 ACM SIGGRAPH 2004 Sketches
ISHair: Importance Sampling for Hair Scattering
Computer Graphics Forum
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We present several techniques for efficiently gathering diffuse and specular reflection rays originating from hair, recently put in production at Rhythm & Hues. We refine the hair BRDFs from [Neulander 2004] into a new cone-shell model that is more generally applicable and realistic, yet remains simple and fast to evaluate. Next, we address the chief shortcoming of [Neulander 2004]'s hair occlusion model by coupling it with rigorous occlusion-testing of skin geometry. Finally, we deploy a per-strand shading cache to improve performance, adopting a filtering technique in the spirit of trilinear mip-mapping.