Reflection matrix causes twoSidedLighting material to be darker

All boxes’s material is PBRMaterial, and twoSidedLighting is set to be true.
The blue one is transformed by reflection matrix, but is deeply darker than the red one.

because MirrorTexture uses ReflectionMatrix to implementing reflection, so the darker problem is also exists.

Hello! I’m not sure I understand your issue :slight_smile:

I would advise to disable originBoxMat.useRadianceOcclusion = false; in this case as it will mess up the use of normals in the mirror: