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Simplify thin-film layering into thin-film BSDF parameters #1413

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niklasharrysson
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This change list simplifies the way thin-film iridescence is specified in the PBR library, as discussed in issue #1384.

@niklasharrysson
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Thin-film results should remain unchanged.

Here's a before/after comparison for StandardSurface:
old_SS_ThinFilm_glsl
SS_ThinFilm_glsl

And here's a before/after comparison for GltfPbr:
old_PBR_Iridescence_glsl
PBR_Iridescence_glsl

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@niklasharrysson This looks like a great improvement, but perhaps we should leave our data libraries (e.g. libraries/bxdf) unchanged for now, so that we can continue validating the upgrade process during development on 1.39? Once the 1.39 codebase is complete, we can then upgrade our data libraries all at once, removing the extra work of applying the upgrade process to these files.

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This looks great to me, thanks @niklasharrysson!

@jstone-lucasfilm jstone-lucasfilm merged commit c6dcd5d into AcademySoftwareFoundation:dev_1.39 Aug 17, 2023
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2 participants