Sculpt: Elastic Deform Brush

This patch implements the paper "Regularized Kelvinlets: Sculpting Brushes based on Fundamental Solutions of Elasticity" https://graphics.pixar.com/library/Kelvinlets/paper.pdf

It includes grab, biscale grab, triscale grab, scale and twist.
All deformation modes are accessible under the same tool. This helps to keep the code organized and it should not make any difference to the user when a better brush management system is implemented.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D5634

1 files changed, 7 insertions, 1 deletions

diff --git a/source/blender/editors/sculpt_paint/paint_stroke.c b/source/blender/editors/sculpt_paint/paint_stroke.c
index 18f087e8c7b..0072888cb8d 100644
--- a/source/blender/editors/sculpt_paint/paint_stroke.c
+++ b/source/blender/editors/sculpt_paint/paint_stroke.c
@@ -221,6 +221,7 @@ static bool paint_tool_require_location(Brush *brush, ePaintMode mode)
     case PAINT_MODE_SCULPT:
       if (ELEM(brush->sculpt_tool,
                SCULPT_TOOL_GRAB,
+               SCULPT_TOOL_ELASTIC_DEFORM,
                SCULPT_TOOL_ROTATE,
                SCULPT_TOOL_SNAKE_HOOK,
                SCULPT_TOOL_THUMB)) {
@@ -251,7 +252,11 @@ static bool paint_tool_require_inbetween_mouse_events(Brush *brush, ePaintMode m
 {
   switch (mode) {
     case PAINT_MODE_SCULPT:
-      if (ELEM(brush->sculpt_tool, SCULPT_TOOL_GRAB, SCULPT_TOOL_ROTATE, SCULPT_TOOL_THUMB)) {
+      if (ELEM(brush->sculpt_tool,
+               SCULPT_TOOL_GRAB,
+               SCULPT_TOOL_ROTATE,
+               SCULPT_TOOL_THUMB,
+               SCULPT_TOOL_ELASTIC_DEFORM)) {
         return false;
       }
       else {
@@ -949,6 +954,7 @@ static bool sculpt_is_grab_tool(Brush *br)
 {
   return ELEM(br->sculpt_tool,
               SCULPT_TOOL_GRAB,
+              SCULPT_TOOL_ELASTIC_DEFORM,
               SCULPT_TOOL_THUMB,
               SCULPT_TOOL_ROTATE,
               SCULPT_TOOL_SNAKE_HOOK);