Weight Paint: restore non-spray functionality

When painting with spray disabled - we need to re-apply
on top of the original each time.

Applying the soc-2016-pbvh-painting branch removed this.
While I'd added back a simple previous weight array,
this won't work when multiple groups are painted at once.

1 files changed, 4 insertions, 1 deletions

diff --git a/source/blender/blenkernel/BKE_paint.h b/source/blender/blenkernel/BKE_paint.h
index 6cae8d28947..fe7461c810d 100644
--- a/source/blender/blenkernel/BKE_paint.h
+++ b/source/blender/blenkernel/BKE_paint.h
@@ -228,9 +228,12 @@ typedef struct SculptSession {
 
 			/* Vertex aligned arrays of weights. */
 			float *previous_accum;
-			float *previous_weight;
 			/* Keep track of how much each vertex has been painted (non-airbrush only). */
 			float *alpha_weight;
+
+			/* Needed to continuously re-apply over the same weights (VP_SPRAY disabled).
+			 * Lazy initialize as needed (flag is set to 1 to tag it as uninitialized). */
+			struct MDeformVert *dvert_prev;
 		} wpaint;
 
 		//struct {