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The support is limited to reading the KHR_materials_iridescence parameters from the source file and setting them in the UE Material, which is not provided.
IridescenceThicknessMinimum is now 100, was 200 (typo).
Substrate Materials Slabs have 3 complexity levels: Simple, Single, Complex. Materials with only BaseColor/Metalness/Roughness/Normal/Emissive/AO can be rendered using a single Simple slab. Since a large part of materials falls in this category it is important to treat them properly. This code allows you to specify simplified materials for these cases.
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Substrate Materials Slabs have 3 complexity levels: Simple, Single, Complex.
Materials with only BaseColor/Metalness/Roughness/Normal/Emissive/AO can be rendered using a single Simple slab.
Since a large part of materials falls in this category it is important to treat them properly.
This code allows you to specify simplified materials for these cases.