Tested on multiple computers and OSs
Broken: Tested on 2.78 (2.78c) and newer builds
After adding a face int layer to a bmesh, the unwrap reset operator only produces weird UV maps.
Exact steps for others to reproduce the error
# Create a new mesh or use an existing one (e.g. from edit mode) me = bpy.data.meshes.new(filename) bm = bmesh.new() bm.from_mesh(me) # Then add a new integer layer (I'm intending to use this to store a bit field for each face) type_layer = bm.faces.layers.int.new("Type") # ... add geometry ... # Link the object to the scene ob = bpy.data.objects.new(filename, me) scene.objects.link(ob) scene.objects.active = ob
Then in edit mode, select everything, hit U and then Reset. The resulting UV map will consist of rather random lines. It's only broken for objects with this int layer.
File with a mesh that has a layer: