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bugfix: Reinstated normal length sanity check since at least once case slipped through; testdata/scad/misc/normal-nan.scad

syntax_highlighting^2
Marius Kintel 2011-12-26 13:22:43 +01:00
parent 85420b81b3
commit f0817a1c16
1 changed files with 3 additions and 0 deletions
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src/export.cc
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@ -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 << " "