getRoughnessTexture
Gets the roughness texture of the PhysicallyBasedMaterial.
Return
The roughness texture of the PhysicallyBasedMaterial.
Throws
IllegalStateException
If this material is closed or invalid.
Gets the roughness texture of the PhysicallyBasedMaterial.
The roughness texture of the PhysicallyBasedMaterial.
If this material is closed or invalid.