Commits on Sep 3, 2021

1. Fixing lighting issues with UsdPreviewSurface …

   We recently debugged a scene that failed to render correctly with the V2
   Light API. The main issue with shadows was fixed in another PR, but there
   were still 3 other problems where the Light API V1 was not on-par with USD
   and the V2 Light API.
   
   1- Directional light affects IBL lighting
   
   Create a test scene:
   
   - 20x20 plane at the origin, usdPreviewSurface shading, 50% metalness
   - aiSkyDomeLight with an environment map
   - Directional light with *zero* intensity
   
   Rotate the directional light, and watch how it affects the lighting of the plane. That light has zero intensity, so it should have no effect.
   
   2- textured occlusion does not affect environment lighting
   
   One of the assets in the scene had a textured occlusion map which
   correctly worked with scene lights, but not with aiSkyDome lights.
   
   3- specular highlights from regular Maya lights did not have enough base
   color for metallic workflows.
   
   That one was fixed for aiSkyDome lights in PR #1356 but direct lighting
   still used the old formula.

   

   JGamache-autodesk committed Sep 3, 2021
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