- bpy.types.Mesh.tangent_vecs = bpy.props.BoolProperty(name="Tangent vectors", description="Compute tangent vectors for vertices", default=False)
+ bpy.types.Mesh.tangent_vecs = bpy.props.EnumProperty(name="Tangent vectors", description="Compute tangent vectors for vertices", default="AUTO",
+ items=(("NO", "No", "Do not export tangent vectors"),
+ ("AUTO", "Auto", "Automatically determine the need for tangent vectors"),
+ ("YES", "Yes", "Always export tangent vectors")))