[BUG] IOR is not preserved when using Scene.ToGltf2()

[PassiveModding]

Describe the bug
IOR values are not transferred when running Scene.ToGltf2()

This happens because the value of the field is set in

SharpGLTF/src/SharpGLTF.Toolkit/Schema2/MaterialExtensions.cs

Line 393 in f5cd805

dstMaterial.IndexOfRefraction = srcMaterial.IndexOfRefraction;

happens before extensions are cleared for specific shader styles.

To Reproduce

• Use Example1 project.
• Set either material's IndexOfRefraction to a non-default value
• Run Example1 project
• Check output file for IOR extension

please complete the following information:

• OS: Windows
• SharpGLTF Version 1.0.1

Potential solutions

• Include MaterialIOR as a supported extension on PBRMetallicRoughness
• Move the assignment to after shaderstyle is set

[vpenades]

thanks, I'll look into it