Option to draw mesh vertex-weights in editmode, available from the 'Mesh Display' panel.
TODO: get this to work when modifiers are applied in solid mode (texface-solidmode is working).
notes:
- vertices with zero weights are considered the same as vertices outside of a group.
- currently these show black but this can be made a theme color.
- multi-paint overrides this option (noted in description)
- use 2 omp sections for vert -> (edge, face) selection flushing.
- dont use face-loop iterator for cddm_from_bmesh_ex conversion to give some speedup (some modifiers use this).
- use float(*)[3] for functions that return coords.
now blenlib/BLI doesn't depend on any blenkern/BKE functions,
there are still some bad level includes but these are only to access G.background and the blender version define.
update the function to calculate the derived mesh with bmesh data-mask each time.
resolves bug [#33205] Bmesh "from_object" gives "no usable mesh data".
also found 'mesh_build_data' could run with non mesh objects and fail silently - add an assert.
reported as [#29376] BMESH_TODO: remove tessface CD_ORIGINDEX layer
for a single mesh there could be 3 origindex mappings stored, one on the polygons and 2 on the tessfaces.
(CD_POLYINDEX and CD_ORIGINDEX).
as Andrew suggests, now tessfaces (which are really a cache of polygons), using origindex to point to polygons on
the same derived mesh, and polygons only store the original index values.
It also changes multi-paint's "zero weight color" to black again--it was unintentionally changed to red some time late last year when an aspect of the colors were changed.
When in material display mode, mesh_calc_modifiers() calculates the
orco DerivedMesh, which uses a different CustomDataMask. In
particular, it does not necessarily include the current modifier's
requiredDataMask, so those layers might get set to NO_COPY. For the
skin modifier, this resulted in a crash when the modifier internally
copies the DerivedMesh and the output does not contain the expected
MVertSkin layer.
Fixed by adding the requiredDataMask to the orco DM's CustomDataMask.
Also added a debugging function to customdata.c:
customData_mask_layers__print(CustomDataMask mask);
This will print out the names of all the CD layer types in the mask.
