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Material specularity behaves incorrectly (breaking KHR_materials_specular) #7304

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aidinabedi opened this issue Jan 21, 2025 · 0 comments
Open

Material specularity behaves incorrectly (breaking KHR_materials_specular) #7304

aidinabedi opened this issue Jan 21, 2025 · 0 comments
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area: graphics Graphics related issue bug

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@aidinabedi
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aidinabedi commented Jan 21, 2025 •
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It seems that the specularityFactor property in a StandardMaterial incorrectly affects diffuse, when useMetalnessSpecularColor = true. This issue is most apparent when loading a glTF that relies on the KHR_materials_specular extension. If the glTF has "specularFactor": 0, the diffuse color is ignored in the engine, which it shouldn't.

See the attached Sphere.glb viewed in the official glTF viewer (expected result) compared to PlayCanvas glTF viewer (actual result):

Image

Image

This issue exists in both the latest 2.x and 1.x versions of the PlayCanvas engine.
@aidinabedi aidinabedi changed the title Material specularity doesn't behave correctly (breaking KHR_materials_specular) Material specularity behaves incorrectly (breaking KHR_materials_specular) Jan 21, 2025
@mvaligursky mvaligursky added bug area: graphics Graphics related issue labels Jan 21, 2025
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