Sculpt: Boundary Brush Falloff Types and Offset

This adds the boundary_falloff_type and boundary_offset to control how the
falloff of the Boundary Brush is applied.

Boundary Origin Offset is the same concept as the Pose Origin offset in
the Pose Brush. It is a multiplier that adds extra length to the brush
radius to locate the deformation pivot further from the boundary without
affecting the falloff.

The Falloff type includes Constant (previous default), brush radius, loop
and loop and invert. Loop and Loop and Invert can be used to create
deformation patterns in a mesh.

Reviewed By: sergey

Differential Revision: https://developer.blender.org/D8526

1 files changed, 5 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_paint.h b/source/blender/blenkernel/BKE_paint.h
index 58687858a9e..7b63a4154fa 100644
--- a/source/blender/blenkernel/BKE_paint.h
+++ b/source/blender/blenkernel/BKE_paint.h
@@ -337,6 +337,11 @@ typedef struct SculptBoundary {
   int vertices_capacity;
   int num_vertices;
 
+  /* Distance from a vertex in the boundary to initial vertex indexed by vertex index, taking into
+   * account the lengh of all edges between them. Any vertex that is not in the boundary will have
+   * a distance of 0. */
+  float *distance;
+
   /* Data for drawing the preview. */
   SculptBoundaryPreviewEdge *edges;
   int edges_capacity;