Reported by Reiner Prokein A .obj file can have multiple mtllib statements with the same name. Ensure that only one occurance is saved, so we don't get multiple entries from same material. Also fix tabs -> spaces
Reported by Reiner Prokein A .obj file can have multiple mtllib statements with the same name. Ensure that only one occurance is saved, so we don't get multiple entries from same material. Also fix tabs -> spaces