Sculpt: Multithreading & PBVH Changes

* Sculpting, normal update and bounding box code is now multithreaded
  using OpenMP.
* Fix a number of update issues: normals on node boundaries, outdated
  bounding boxes, partial redraw, .. . There's probably still a few
  left, but should be better now.
* Clicking once now does a single paint instead of two (was also
  painting on mouse up event).
* Smooth shading now is enabled for the full mesh when the first face
  uses it (so it can be tested at least).

Implementation Notes:

* PBVH search can now be done either using a callback or bt gathering the
  nodes in an array. The latter makes multithreading with OpenMP easier.
* Normals update code is now inside PBVH, was doing it per node before but
  should do all faces first and only then vertices.
* Instead of using search modes + 1 modified flag, now nodes get 4 flags
  to indicate what needs to be updated for them, found that this makes it
  easier for me to understand the code and fix update bugs.
* PBVHNode is now exposed as an abstract type, I think this makes it more
  clear what is happening than having it's data passed as part of callback
  functions.
* Active_verts list was replaced by looping over nodes and the vertices
  inside them. However the grab brush still uses the active_verts system,
  will fix that later.
* Some micro-optimizations, like avoiding a few multiplications/divisions,
  using local variables instead of pointers, or looping over fewer vertices
  to update the bounding boxes.

1 files changed, 1 insertions, 1 deletions

diff --git a/source/blender/blenkernel/intern/brush.c b/source/blender/blenkernel/intern/brush.c
index 115d31b587c..8a4ffca8244 100644
--- a/source/blender/blenkernel/intern/brush.c
+++ b/source/blender/blenkernel/intern/brush.c
@@ -83,7 +83,7 @@ Brush *add_brush(const char *name)
 	brush->clone.alpha= 0.5;
 	brush->sculpt_tool = SCULPT_TOOL_DRAW;
 
-	brush_curve_preset(brush, BRUSH_PRESET_SHARP);
+	brush_curve_preset(brush, BRUSH_PRESET_SMOOTH);
 
 	/* enable fake user by default */
 	brush->id.flag |= LIB_FAKEUSER;