[Bf-blender-cvs] [43f748a32fd] master: Fix mesh boundary automask curve falloff

[Pablo Dobarro]

Commit: 43f748a32fd541aac8cf499e03cf624806e30967
Author: Pablo Dobarro
Date:   Fri Mar 27 23:22:59 2020 +0100
Branches: master
https://developer.blender.org/rB43f748a32fd541aac8cf499e03cf624806e30967

Fix mesh boundary automask curve falloff

As the main use case of this feature is to work with cloth, using this
curve makes more sense than a smoothstep to simulate cloth tension near
the edges.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D7262

===================================================================

M	source/blender/editors/sculpt_paint/sculpt.c

===================================================================

diff --git a/source/blender/editors/sculpt_paint/sculpt.c b/source/blender/editors/sculpt_paint/sculpt.c
index 82f9bbc5f56..73173571277 100644
--- a/source/blender/editors/sculpt_paint/sculpt.c
+++ b/source/blender/editors/sculpt_paint/sculpt.c
@@ -1741,7 +1741,7 @@ static float *sculpt_boundary_edges_automasking_init(Object *ob,
   for (int i = 0; i < totvert; i++) {
     if (edge_distance[i] != EDGE_DISTANCE_INF) {
       const float p = 1.0f - ((float)edge_distance[i] / (float)propagation_steps);
-      const float edge_boundary_automask = 3.0f * p * p - 2.0f * p * p * p;
+      const float edge_boundary_automask = pow2f(p);
       automask_factor[i] *= (1.0f - edge_boundary_automask);
     }
   }