merge materials doesn't remove unused materials

[Alessandro Padovani]

When we merge and separate meshes it may happen that unused materials are left on some objects. For example if we separate some parts and/or delete unneccesary geometry. In this case “merge materials” doesn’t delete the unused materials.

There’s a quick command in blender to do that on the active object so it’s not a big deal. But when we merge materials on multiple meshes it may come in handy if “merge materials” also deletes the unused materials as a last step.

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[Thomas Larsson]

Aren’t unused materials removed automatically when the file is reopened? Unless there is a fake user.

[Alessandro Padovani]

Nope, because the materials get a owner that’s the geometry, even if there’s no face associated. We have to use “remove unused material slots“ for every mesh.

example steps:

1. import G8F
2. in edit mode select some geometry and separate by selection (mesh > separate > selection)

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[Thomas Larsson]

OK, I didn’t read the part about separate meshes. Fixed in last commit.

[Alessandro Padovani]

commit 76a6c2d works fine