Aras Pranckevicius
91b5254598
The old Python OBJ importer had a (somewhat confusingly named) "Keep Vertex Order -> Poly Groups" option, that imported OBJ groups as "vertex groups" on the resulting mesh. All vertices of any face were assigned the vertex group, with a 1.0 weight. The new C++ importer did not have this option. It was trying to do something with vertex groups, but failing to actually achieve anything :) -- the vertex groups were created on the wrong object (later on overwritten by "nomain mesh to main mesh" operation); vertex weights were set to 1.0/vertex_count, and each vertex was only set to be in one group, even when it belongs to multiple faces from different groups. End result was that to the user, vertex groups were not visible/present at all (see T98874). This patch adds the import option (named "Vertex Groups"), which is off by default, and fixes the import code logic to actually do the right thing. Tested on file from T98874; vertex groups are imported just like with the Python importer. Reviewed By: Howard Trickey Differential Revision: https://developer.blender.org/D15200