Blender Git Loki

Sculpt dyntopo: Fix boundary brush for multires

This commit fixes boundary brush for multires which
broke two commits ago.

This required implementing the geodesic api for PBVH_GRIDS,
which I did by building topology maps in a rather. . .
haphazard fashion.

Basically I built a vert->edge map and then used it to
derive a pseudo edge to quads mapping (it maps edges
to all the verts in the two surrounding quads except
the edge's own verts).

Just for fun I enabled geodesic mode in mask expand;
it seems to work.

Merge branch 'master' into temp_bmesh_multires

Sculpt dyntopo: improve boundary brush for irregular topology
(still a wip)

The boundary brush now builds a geodesic distance
field (from the boundary) from which it derives a tangent
field:

* These now define the rotation plane for bend mode.
* Rotation origins snap to these planes.

There is also typedef'd code for visualization tangents
in a temporary object (note the sculpt object), to enable
define VISBM in sculpt_boundary.c. This will be removed
lated.

Additional changes:

* Added a function to get the number of edges around verts,
SCULPT_vertex_valence_get.
* Added an API to calculate cotangent weights for vert fans,
SCULPT_cotangents_begin (call in main thread first) and
SCULPT_get_cotangents.
* Sculpt neighbors for PBVH_FACES now uses ss->vemap if it exists.
* The Mesh topology mapping code now takes extra parameters for
sorting vert/edge cycles geometrically.
* Similarly, there is now a function to sort BMesh edge cycles,
BM_sort_disk_cycle.
* MDynTopoVert->flag now has a bitflag for when the disk cycle
sorting needs to be redone, DYNVERT_NEED_DISK_SORT.
* The sculpt geodesic code now supports passing in custom vertex
coordinates.
* The geodesic API can also build an optional map of which vertex
in the initial vertex list is closest to any other vertex.

Sculpt dyntopo: fix bug with dyntopo geometry undo push

Sculpt Dyntopo: PBVH draw fixes

* The PBVH draw subsystem is now told whether any viewports
have drawtype >= OB_MATERIAL before anything in any windows
are drawn. There are no alternatives given the design
constraints of sculpting, where simply uploading data to the GPU
quickly becomes a bottleneck.

* Fixed flat vcol shading mode.

* Don't rely on BMLog's stored normals, instead flag pbvh nodes to
update normals on undo/redo.

Sculpt dyntopo: Fix bug in cleanup_valence_3_4

Merge branch 'master' into temp_bmesh_multires

Also fixed a pbvh corruption bug

Dyntopo sculpt: add dev operator to debug memory cache coherency

Asset Browser: Support dropping materials into Face Sets

Merge branch 'master' into sculpt-dev

Cursor: Change face set color and wireframe preview

Merge branch 'master' into sculpt-dev

Merge branch 'master' into sculpt-dev

Merge branch 'master' into temp_bmesh_multires
Also:

* added BMLog function to save mesh IDs.
- Used by SCULPT_UNDO_DYNTOPO_BEGIN/END instead of
saving the whole mesh, which was the previous behavior.
* SCULPT_UNDO_DYNTOPO_BEGIN no longer pushes a non-dyntopo
geomtry undo node, as this is no longer necassary.

This greatly speeds up going into/out of sculpt mode
with dyntopo enabled, as before it was copying
the mesh twice.

Merge branch 'master' into sculpt-dev

Array Brush: Support array editing with the voxel remesher

Merge branch 'master' into sculpt-dev

sculpt dyntopo: fix memory corruption and associated memory leak

Add 'projection' option for volume-preserving smoothing to
smooth corrective modifier