diff options
| -rw-r--r-- | source/blender/freestyle/intern/geometry/FitCurve.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/source/blender/freestyle/intern/geometry/FitCurve.cpp b/source/blender/freestyle/intern/geometry/FitCurve.cpp index cc21ba05f3d..a5701ea05e5 100644 --- a/source/blender/freestyle/intern/geometry/FitCurve.cpp +++ b/source/blender/freestyle/intern/geometry/FitCurve.cpp @@ -376,6 +376,12 @@ static Vector2 ComputeCenterTangent(Vector2 *d, int center) tHatCenter[0] = (V1[0] + V2[0]) / 2.0; tHatCenter[1] = (V1[1] + V2[1]) / 2.0; tHatCenter = *V2Normalize(&tHatCenter); + + /* avoid numerical singularity in the special case when V1 == -V2 */ + if (V2Length(&tHatCenter) < M_EPSILON) { + tHatCenter = *V2Normalize(&V1); + } + return tHatCenter; } |