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Fixed #26167.
Description
The PR makes sure
GLTFLoaderhandles the edge case when the material's IOR is zero.As suggested in #26167 (comment), the value is mapped to a large IOR so the Fresnel term evaluates to approximately 1.0. This moves the implementation closer to what the glTF spec suggests:
https://github.com/KhronosGroup/glTF/blob/main/extensions/2.0/Khronos/KHR_materials_ior/README.md#specular-glossiness-backwards-compatibility-mode