Enables the PreprocessMaterialDescription AssetPostprocessor on the current importer.
When selected, the model importer delegates the process of populating generated material properties to OnPreprocessMaterialDescription AssetPostprocessor In this mode, the model importer collects all available properties and animation data read from imported materials into a MaterialDescription structure. Use this mode for complete user control over material creation during import. This is useful when using a Scriptable Render Pipeline.. When selected, OnPostprocessMaterial AssetPostprocessor is not called by the Model Importer. See Also: AssetPostprocessor.OnPreprocessMaterialDescription.