unify positive and negative zeros in stl_check_facets_exact() and stl_check_facets_nearby() New function stl_transform() by a 3x4 matrix. Some constness improvements.
unify positive and negative zeros in stl_check_facets_exact() and stl_check_facets_nearby() New function stl_transform() by a 3x4 matrix. Some constness improvements.