Fix for old bug with subsurf not initializing normals for edges that had no faces,

Noted that a floating point exception caused by this r28953.

With the render engine using DerivedMesh normals this came up as a memory error when rendering some files.

for now zero the normals, could interpolate between vertex normals if needed.

1 files changed, 11 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/CCGSubSurf.c b/source/blender/blenkernel/intern/CCGSubSurf.c
index 2cfd17a95f3..a311ca15e5e 100644
--- a/source/blender/blenkernel/intern/CCGSubSurf.c
+++ b/source/blender/blenkernel/intern/CCGSubSurf.c
@@ -1342,6 +1342,17 @@ static void ccgSubSurf__calcVertNormals(CCGSubSurf *ss,
 				NormCopy(EDGE_getNo(e, lvl, x),
 					_face_getIFNoEdge(f, e, lvl, x, 0, subdivLevels, vertDataSize, normalDataOffset));
 		}
+		else {
+			/* set to zero here otherwise the normals are uninitialized memory
+			 * render: tests/animation/knight.blend with valgrind.
+			 * we could be more clever and interpolate vertex normals but these are
+			 * most likely not used so just zero out. */
+			int x;
+
+			for (x=0; x<edgeSize; x++) {
+				NormZero(EDGE_getNo(e, lvl, x));
+			}
+		}
 	}
 }
 #undef FACE_getIFNo