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check for negative determinate in stl transform functions

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Michael Kirsch 2019-06-29 10:47:41 +02:00 committed by Joseph Lenox
parent ea156dab02
commit d18fe56f8d
1 changed files with 8 additions and 0 deletions
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8
xs/src/admesh/util.c
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@ -201,6 +201,10 @@ void stl_transform(stl_file *stl, double const *trafo3x4) {
v_dst->z = (float)(trafo3x4[8] * v_src_x + trafo3x4[9] * v_src_y + trafo3x4[10] * v_src_z + trafo3x4[11]);
}
}
double det = trafo3x4[0]*trafo3x4[5]*trafo3x4[10] + trafo3x4[4]*trafo3x4[9]*trafo3x4[2] + trafo3x4[8]*trafo3x4[1]*trafo3x4[6]
- trafo3x4[0]*trafo3x4[9]*trafo3x4[6] - trafo3x4[4]*trafo3x4[1]*trafo3x4[10] - trafo3x4[8]*trafo3x4[5]*trafo3x4[2];
if(det < 0)
stl_reverse_all_facets(stl);
stl_get_size(stl);
calculate_normals(stl);
}
@ -237,6 +241,10 @@ void stl_get_transform(stl_file const *stl_src, stl_file *stl_dst, double const
v_dst->z = (float)(trafo3x4[8] * v_src_x + trafo3x4[9] * v_src_y + trafo3x4[10] * v_src_z + trafo3x4[11]);
}
}
double det = trafo3x4[0]*trafo3x4[5]*trafo3x4[10] + trafo3x4[4]*trafo3x4[9]*trafo3x4[2] + trafo3x4[8]*trafo3x4[1]*trafo3x4[6]
- trafo3x4[0]*trafo3x4[9]*trafo3x4[6] - trafo3x4[4]*trafo3x4[1]*trafo3x4[10] - trafo3x4[8]*trafo3x4[5]*trafo3x4[2];
if(det < 0)
stl_reverse_all_facets(stl_dst);
stl_get_size(stl_dst);
calculate_normals(stl_dst);
}