Commit: ac2ebf9c54a9081662ab17f04240c00d9e5ac799
Author: Campbell Barton
Date: Thu Jan 11 10:57:30 2018 +1100
Branches: master
https://developer.blender.org/rBac2ebf9c54a9081662ab17f04240c00d9e5ac799
Fix T53455: Object disappear w/ TrackTo constraint
Regression caused by own commit 16fbb47c886,
this is really an edge case though since calling normalize twice fixes.
===================================================================
M source/blender/blenkernel/intern/constraint.c
===================================================================
diff --git a/source/blender/blenkernel/intern/constraint.c
b/source/blender/blenkernel/intern/constraint.c
index a5d0df88198..c77cac7bcbd 100644
--- a/source/blender/blenkernel/intern/constraint.c
+++ b/source/blender/blenkernel/intern/constraint.c
@@ -1018,8 +1018,11 @@ static void vectomat(const float vec[3], const float
target_up[3], short axis, s
u[2] = 1;
}
+ /* note: even though 'n' is normalized, don't use
'project_v3_v3v3_normalized' below
+ * because precision issues cause a problem in near degenerate states,
see: T53455. */
+
/* project the up vector onto the plane specified by n */
- project_v3_v3v3_normalized(proj, u, n); /* first u onto n... */
+ project_v3_v3v3(proj, u, n); /* first u onto n... */
sub_v3_v3v3(proj, u, proj); /* then onto the plane */
/* proj specifies the transformation of the up axis */
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