D15041: Sculpt: Elastic Transform

This implements transform modes for the transform tool and Elastic
Transform. This mode uses the Kelvinlets from elastic deform to apply
the transformation to the mesh, using the cursor radius to control the
elasticity falloff.

{F9269771}

In order for this to work, the transform tool uses incremental mode when
elastic transform is enabled. This allows to integrate the displacement of
the Kelvinet in multiple steps.

Review By: Sergey Sharbin & Daniel Bystedt & Julian Kaspar & Campbell
Barton

Differential Revision: https://developer.blender.org/D9653

Ref D15041

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_paint.h b/source/blender/blenkernel/BKE_paint.h
index 9e0ea5e13d5..a47e4a24f75 100644
--- a/source/blender/blenkernel/BKE_paint.h
+++ b/source/blender/blenkernel/BKE_paint.h
@@ -613,6 +613,10 @@ typedef struct SculptSession {
   float init_pivot_rot[4];
   float init_pivot_scale[3];
 
+  float prev_pivot_pos[3];
+  float prev_pivot_rot[4];
+  float prev_pivot_scale[3];
+
   union {
     struct {
       struct SculptVertexPaintGeomMap gmap;