| Session Name: | PBR Diffuse Lighting for GGX+Smith Microsurfaces |
| Speaker(s): | Earl Hammon, Jr. |
| Company Name(s): | Respawn Entertainment |
| Track / Format: | Programming |
| Overview: | PBR specular uses a microfacet model, typically with a GGX normal distribution and Smith shadowing/masking. This talk will derive a PBR diffuse lighting model using the same microsurface, eliminating ad-hoc conversion of surface parameters between unrelated diffuse and specular models. This will shed light on microfacet models in general and some intricacies of Smith shadowing/masking and diffuse lighting models in particular. This session will see Disney's BRDF slices and how to interpret them for quick and easy BRDF comparison. Ultimately, this talk will discuss a new GGX+Smith diffuse shading model, a new and cheap approximation for Smith specular shadowing/masking, and some mathematical identities that can save 7-10 pixel shader cycles per light. |
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