[Bf-blender-cvs] [895fef5ccba] sculpt-dev: Sculpt: Add area normal test to clay strips for better front faces detection

[Pablo Dobarro]

Commit: 895fef5ccbac8b051b88c8a4a34821bcf46ff3ae
Author: Pablo Dobarro
Date:   Sun Apr 18 20:10:12 2021 +0200
Branches: sculpt-dev
https://developer.blender.org/rB895fef5ccbac8b051b88c8a4a34821bcf46ff3ae

Sculpt: Add area normal test to clay strips for better front faces detection

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

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 d4b5fa3bb9d..32cdf75f4cc 100644
--- a/source/blender/editors/sculpt_paint/sculpt.c
+++ b/source/blender/editors/sculpt_paint/sculpt.c
@@ -1114,6 +1114,7 @@ void SCULPT_tag_update_overlays(bContext *C)
   View3D *v3d = CTX_wm_view3d(C);
   if (!BKE_sculptsession_use_pbvh_draw(ob, v3d)) {
     DEG_id_tag_update(&ob->id, ID_RECALC_GEOMETRY);
+    DEG_id_tag_update(&ob->id, ID_RECALC_GEOMETRY);
   }
 }
 
@@ -5689,6 +5690,12 @@ static void do_clay_strips_brush_task_cb_ex(void *__restrict userdata,
       continue;
     }
 
+    float vertex_no[3];
+    SCULPT_vertex_normal_get(ss, vd.index, vertex_no);
+    if (dot_v3v3(area_no_sp, vertex_no) <= -0.1f) {
+      continue;
+    }
+
     float intr[3];
     float val[3];
     closest_to_plane_normalized_v3(intr, test.plane_tool, vd.co);