Vertex/Weight Paint: Use PBVH for painting

2016 GSOC project by @nathanvollmer, see D2150

- Mirrored painting and radial symmetry, like in sculpt mode.
- Volume based splash prevention,
  which avoids painting vertices far away from the 3D brush location.
- Normal based splash prevention,
  which avoids painting vertices with normals opposite the normal
  at the 3D brush location.
- Blur mode now uses a nearest neighbor average.
- Average mode, which averages the color/weight
  of the vertices within the brush
- Smudge mode, which pulls the colors/weights
  along the direction of the brush
- RGB^2 color blending, which gives a more accurate
  blend between two colors
- multithreading support. (PBVH leaves are painted in parallel.)
- Foreground/background color picker in vertex paint

1 files changed, 1 insertions, 6 deletions

diff --git a/source/blender/makesdna/DNA_scene_types.h b/source/blender/makesdna/DNA_scene_types.h
index 740d640a6da..3201b75ee1e 100644
--- a/source/blender/makesdna/DNA_scene_types.h
+++ b/source/blender/makesdna/DNA_scene_types.h
@@ -1117,13 +1117,8 @@ typedef struct UvSculpt {
 /* Vertex Paint */
 typedef struct VPaint {
 	Paint paint;
-
 	short flag, pad;
-	int tot;							/* allocation size of prev buffers */
-	unsigned int *vpaint_prev;			/* previous mesh colors */
-	struct MDeformVert *wpaint_prev;	/* previous vertex weights */
-	
-	void *paintcursor;					/* wm handle */
+	int radial_symm[3]; /* For mirrored painting */
 } VPaint;
 
 /* VPaint.flag */