Using BMesh operators through the edit-mesh API created a full copy
of the mesh so it was possible to restore the mesh in case
one of the operators raised an error.
Remove support for automatic backup/restore from the EDBM_op_* API's
as it adds significant overhead and was rarely used.
Operators that need this can use the BMBackup API to backup & restore
the mesh in case of failure.
Add warning levels to BMO_error_raise so operators can report problems
without it being interpreted as a request to cancel the operation.
For high-poly meshes creating and freeing a full copy is an expensive
operation, removing this gives a speedup of ~1.77x for most operators
except for "connect_verts" / "connect_vert_pair"
which still uses this functionality.
The error codes could be used to look up messages from a table
of messages however this wasn't especially useful.
Now all calls to BMO_error_raise must inclue a message.
BF-admins agree to remove header information that isn't useful,
to reduce noise.
- BEGIN/END license blocks
Developers should add non license comments as separate comment blocks.
No need for separator text.
- Contributors
This is often invalid, outdated or misleading
especially when splitting files.
It's more useful to git-blame to find out who has developed the code.
See P901 for script to perform these edits.
- use 4 weights for vertex customdata blending (was previously only using 2)
- option for simple blending, which blends locations using weights too and doesn't attempt to maintain the shape,
useful for flat surfaces or times when keeping the shape gives odd results.
however this exposed some other odd behavior.
removing a vertex group would add one if not found but only for meshes, not lattices.
now just skip removal if not found.
