Exported GLB Appears Visually Different from Original Despite Matching Mesh & Material Properties (Normals Suspected)

[dhruvaura]

When exporting a .glb file after making operations on it with glTFast 6.11.0, the resulting model looks visually different from the original, even though the geometry and material parameters are identical.

I verified that:

• Vertices, triangles, and submeshes match the original.
• Material properties are identical between the original and the exported model.
• This leads me to believe the problem may be related to normals or how they are handled during export.

Screenshots Original vs. Exported comparisons:

Expected behavior The exported .glb should visually match the original model in Unity. As original and exported both uses gltfast custom shader of pbrMetalicRoughness.

Desktop (please complete the following information):

• glTFast version 6.11.0
• Unity Editor version6.000.45f1
• Render Pipeline and versionURP
• Platform: Windows PC unity editor

Any insights into how normals are exported or whether they might be recalculated/optimized differently would be helpful. Thanks

[atteneder]

Hi,

Thanks for getting in touch. Can you provide the original and re-exported glTF files? What do you mean with doing operations on it?

Thanks