Consolidate glTF PBR graph and remove GLSL override#2850
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jstone-lucasfilm wants to merge 1 commit intoAcademySoftwareFoundation:mainfrom
Open
Consolidate glTF PBR graph and remove GLSL override#2850jstone-lucasfilm wants to merge 1 commit intoAcademySoftwareFoundation:mainfrom
jstone-lucasfilm wants to merge 1 commit intoAcademySoftwareFoundation:mainfrom
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This changelist consolidates the dielectric iridescence path in the glTF PBR shading graph, and removes the hand-authored GLSL graph override that is no longer needed. The following specific changes are included: - Restructure the dielectric iridescence path from `mix(layer(A, C), layer(B, C), w)` to `layer(mix(A, B, w), C)`, eliminating a duplicated layer node that was a workaround for earlier codegen limitations. - Remove the hand-authored GLSL graph override for `gltf_pbr`, as the `PremultipliedBsdfAddRefactor` pass now reproduces these optimizations automatically from the consolidated global graph.
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I'm attaching render comparisons of two glTF PBR example materials, before and after the current PR, demonstrating that both visuals and performance are unchanged: glTF PBR Carpaint (Before): 
glTF PBR Carpaint (After): 
glTF PBR Glass (Before): 
glTF PBR Glass (After): 
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This changelist consolidates the dielectric iridescence path in the glTF PBR shading graph, and removes the hand-authored GLSL graph override that is no longer needed. The following specific changes are included:
mix(layer(A, C), layer(B, C), w)tolayer(mix(A, B, w), C), eliminating a duplicated layer node that was a workaround for earlier codegen limitations.gltf_pbr, as thePremultipliedBsdfAddRefactorpass now reproduces these optimizations automatically from the consolidated global graph.