Merge pull request KhronosGroup#32 from KhronosGroup/anisotropy-disc-…

…test Added Eric's anisotropy disc test model.
mrdoob · Oct 14, 2023 · bd539c1 · bd539c1
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diff --git a/Models/AnisotropyDiscTest/README.body.md b/Models/AnisotropyDiscTest/README.body.md
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+## Screenshot
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+![screenshot](screenshot/screenshot-large.png)
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+## Description
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+This model tests the main texturemap for [`KHR_materials_anisotropy`](https://github.com/KhronosGroup/glTF/tree/main/extensions/2.0/Khronos/KHR_materials_anisotropy).  It has the following features:
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+- An array of base material roughness values are tested with the same texturemap each time.
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+- The upper-left quadrant tests a disc-shaped anisotropic pattern at a strength of about 3%.
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+- The upper-right quadrant tests a disc-shaped anisotropic pattern at a strength of about 10%.
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+- The lower-right quadrant tests a disc-shaped anisotropic pattern at a full strength.
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+- The lower-left quadrant tests a disc-shaped anisotropic pattern with a gradient strength, starting at zero around the edges and increasing to full strength in the center.
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+Per the anisotropy specification, anisotropic strength increases the material's roughness along a particular direction.  Therefore, zero base roughness with full-strength anisotropy displays the most pronounced result.  Full 1.0 base roughness cannot increase more, and does not show any effects from anisotropy.
diff --git a/Models/AnisotropyDiscTest/glTF-Binary/AnisotropyDiscTest.glb b/Models/AnisotropyDiscTest/glTF-Binary/AnisotropyDiscTest.glb