Fix T44390: Clay brush weirdness part-2

Use the normal of the plane instead of the vertex normal,
since projecting using the vertex normal frequently causes artifacts.

1 files changed, 6 insertions, 2 deletions

diff --git a/source/blender/editors/sculpt_paint/sculpt.c b/source/blender/editors/sculpt_paint/sculpt.c
index 41f53769c4e..95eddbf2a69 100644
--- a/source/blender/editors/sculpt_paint/sculpt.c
+++ b/source/blender/editors/sculpt_paint/sculpt.c
@@ -2645,8 +2645,10 @@ static void do_clay_brush(Sculpt *sd, Object *ob, PBVHNode **nodes, int totnode)
 					sub_v3_v3v3(val, intr, vd.co);
 
 					if (plane_trim(ss->cache, brush, val)) {
+						/* note, the normal from the vertices is ignored,
+						 * causes glitch with planes, see: T44390 */
 						const float fade = bstrength * tex_strength(ss, brush, vd.co, sqrtf(test.dist),
-						                                            vd.no, vd.fno, vd.mask ? *vd.mask : 0.0f);
+						                                            NULL, an, vd.mask ? *vd.mask : 0.0f);
 
 						mul_v3_v3fl(proxy[vd.i], val, fade);
 
@@ -2746,9 +2748,11 @@ static void do_clay_strips_brush(Sculpt *sd, Object *ob, PBVHNode **nodes, int t
 					sub_v3_v3v3(val, intr, vd.co);
 
 					if (plane_trim(ss->cache, brush, val)) {
+						/* note, the normal from the vertices is ignored,
+						 * causes glitch with planes, see: T44390 */
 						const float fade = bstrength * tex_strength(ss, brush, vd.co,
 						                                            ss->cache->radius * test.dist,
-						                                            vd.no, vd.fno, vd.mask ? *vd.mask : 0.0f);
+						                                            NULL, an, vd.mask ? *vd.mask : 0.0f);
 
 						mul_v3_v3fl(proxy[vd.i], val, fade);