Commit: 3b01edd52e8e28f425d76ae17ee50f3feed69d36
Author: Bastien Montagne
Date: Wed Apr 11 17:27:23 2018 +0200
Branches: soc-2017-normal-tools
https://developer.blender.org/rB3b01edd52e8e28f425d76ae17ee50f3feed69d36
Fix weighted normals modifier sometimes affecting actual mesh.
Same issue & same fix as with edit normals modifier some times ago...
===================================================================
M source/blender/modifiers/intern/MOD_weighted_normal.c
===================================================================
diff --git a/source/blender/modifiers/intern/MOD_weighted_normal.c
b/source/blender/modifiers/intern/MOD_weighted_normal.c
index 1f06803505a..7e339f0012d 100644
--- a/source/blender/modifiers/intern/MOD_weighted_normal.c
+++ b/source/blender/modifiers/intern/MOD_weighted_normal.c
@@ -491,9 +491,15 @@ static DerivedMesh *applyModifier(ModifierData *md, Object
*ob, DerivedMesh *dm,
const int numLoops = dm->getNumLoops(dm);
const int numPolys = dm->getNumPolys(dm);
+ MEdge *medge = dm->getEdgeArray(dm);
+ if (me->medge == medge) {
+ /* We need to duplicate data here, otherwise setting custom
normals (which may also affect sharp edges) could
+ * modify org mesh. */
+ dm = CDDM_copy(dm);
+ medge = dm->getEdgeArray(dm);
+ }
MPoly *mpoly = dm->getPolyArray(dm);
MVert *mvert = dm->getVertArray(dm);
- MEdge *medge = dm->getEdgeArray(dm);
MLoop *mloop = dm->getLoopArray(dm);
bool free_polynors = false;
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