Blender Git Loki

Sculpt dyntopo: Add edge API

* Added a minimal edge API to query edge
boundary states.
* This is necassary because the previous approximation,
testing if two adjacent verts are boundaries, breaks
for triangles.

Merge branch 'master' into sculpt-dev

Sculpt: Quantize mask filter

Tweak last commit to not affect base face set.

Sculpt dyntopo: split face set boundaries on mirror boundary

Added an option to split face set boundaries on mirror
boundaries; currently only DynTopo supports this.

Very useful for making hard edges along mirror lines.

Sculpt dyntopo: improved boundary smoothing

It's kind of hackish mathematically.

Sculpt dyntopo: added a smoothing factor for sharp boundaries

Works by projecting non-boundary verts onto boundary vert
normals and weighting by boundary_smooth_Factor.

Missed an ATTR_NONNULL fix

change 'error' to 'warning' in a printf

Sculpt dyntopo: undo bugfixes

* Fixed nasty undo bug related
to now rewinding BMLogEntry subchains properly.
* Fixed bug in dyntopo collapse

Sculpt dyntopo: Who knew gcc's nonnull attribute is 1-based

Sculpt dyntopo: Cleanup past few commits

* Removed some ATTR_NO_OPTs
* Made pbvh_split_edges disallowed
4-valence splits if cleanup topology
mode is on

Sculpt dyntopo: support sharp edge flags

* Sharp edge flags are now supported and are
treated much the same as face set boundaries:
+ Dyntopo preserves them
+ Interior smoothing treats them as boundaries
+ Corners are detected and pinned in smoothing
+ TODO: add a brush flag to ignore sharp boundaries
for smoothing.
* Seams are also preserved, but don't affect smoothing.
* BMLog now saves edges.
* The new edge split function is enabled.
* Dyntopo now pushes new combined BMLog entries in
its top-level function, to avoid scary id reuse
edge cases.
* SCULPT_vertex_is_boundary/corner now take a bitmask
of which types of boundaries you wish to query instead
of check_face_sets.

Sculpt Vertex Colors: New sample color operator

Merge branch 'master' into sculpt-dev

Fix C++20 designated initializer build issue.

commit prior to small cleanup

* Implemented bounday/face set corner handling.
* New function SCULPT_vertex_is_corner, similar to
SCULPT_vertex_is_boundary it takes argument to
check face sets. PBVH_FACES/GRIDS version is
incomplete. It returns a bitmask of whether
the vert is a boundary corner and/or a face
set one.
* PBVH_BMESH uses a somewhat more expensive
calculation to detect corners of face set islands by
edge angle. This is currently not done for boundary
corners.

Corner pinning now happens in:

* The internal smoother dyntopo uses for stability reasons.
* SCULPT_vertex_neighbor_average_interior.
* Topology rake.
* Dyntopo collapse.

Note that DynTopo always pins face set corners
but everything else only does so if preserve face
sets is on.

Sculpt dyntopo: more smooth stuff

* All of the smooth brushes now use the SculptCustomLayer
system for temporary data, so all work with dyntopo now.
* You can now use a flat array in SculptCustomLayer with
PBVH_BMESH (though you have to build the structure manually).
The mesh filter code uses this.
* Smooth (and autosmooth) now have an option to preserve face
set boundaries. Corners are currently not handled.
* Simplify brush has preserve face set boundaries autosmooth
flag set by default.
* SCULPT_vertex_is_boundary now takes an addition argument
for whether to check for face set boundaries.

Sculpt dyntopo: Smooth improvements and bug fixes

* Added an option to weight smooth by face areas
* Dyntopo now caches face areas in a CD_PROP_FLOAT layer
* Dyntopo also caches number of edges around verts inside of
MDynTopoVert. To avoid increasing the struct size flag was
made a short.
* Cleanup mode (dissolves 3/4-valence verts) now piggybacks on
subdivide code to build list of verts; this is much faster.