diff options
Diffstat (limited to 'src/export.cc')
| -rw-r--r-- | src/export.cc | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/export.cc b/src/export.cc index 99bce98..5ce2d15 100644 --- a/src/export.cc +++ b/src/export.cc @@ -102,6 +102,9 @@ void export_stl(CGAL_Nef_polyhedron *root_N, std::ostream &output, QProgressDial double ny = dn[2]*dn[3] - dn[0]*dn[5]; double nz = dn[0]*dn[4] - dn[1]*dn[3]; double nlength = sqrt(nx*nx + ny*ny + nz*nz); + // Avoid generating normals for polygons with zero area + double eps = 0.000001; + if (nlength < eps) nlength = 1.0; output << " facet normal " << nx / nlength << " " << ny / nlength << " " |