demkeys / unity-gltf-importer Goto Github PK

Scenario:
Asset A1 is imported. A1's MeshRenderer expects a material M1, so material M1 is created during the import process and a reference to it is added in the A1 prefab's MeshRenderer.
Then Asset A2 is imported. A2's MeshRenderer also expects a material named M1 so the importer creates a new material asset named M1 and adds a reference to it in A2's prefab. This causes the previous M1 material asset to get overridden. Somehow there is still an M1 material attach to A1's MeshRenderer, but it is not linked to any asset.

Possible solution:
Before creating the material M1 object and asset, scan the current folder to see if a material M1 asset already exists. If yes, load the material object from that asset and add a reference to that in A1's MeshRenderer. If no, the proceed with creating a name material object and asset. As a result, when A2 gets imported, if should then have a reference to the earlier created M1 material, and will not try to create it's own M1 material, but will instead add a reference to that material.