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Hat Kid
ef719d2ab7
When a material in Blender has its IOR level changed to anything other than the default value of 0.5, the `KHR_materials_specular` extension is applied during the glTF export, which is what we use to check for envmaps in custom models. If an envmap is undesired, but the IOR value was accidentally changed, the program would assert during model processing if there is no metallic roughness texture attached to the material. Since this is an easy mistake to make and is hard to spot, this adds a better error message for such cases.