Merge branch 'visitortests' of https://github.com/openscad/openscad into visitortests

src/PolySetCGALEvaluator.cc

@@ -181,6 +181,7 @@ cant_project_non_simple_polyhedron:
 
 static void add_slice(PolySet *ps, const DxfData &dxf, DxfData::Path &path, double rot1, double rot2, double h1, double h2)
 {
+	bool splitfirst = sin(rot2 - rot1) >= 0.0;
 	for (size_t j = 1; j < path.indices.size(); j++)
 	{
 		int k = j - 1;
@@ -197,10 +198,7 @@ static void add_slice(PolySet *ps, const DxfData &dxf, DxfData::Path &path, doub
 		double kx2 = dxf.points[path.indices[k]][0] *  cos(rot2*M_PI/180) + dxf.points[path.indices[k]][1] * sin(rot2*M_PI/180);
 		double ky2 = dxf.points[path.indices[k]][0] * -sin(rot2*M_PI/180) + dxf.points[path.indices[k]][1] * cos(rot2*M_PI/180);
 
-		double dia1_len_sq = (jy1-ky2)*(jy1-ky2) + (jx1-kx2)*(jx1-kx2);
-		double dia2_len_sq = (jy2-ky1)*(jy2-ky1) + (jx2-kx1)*(jx2-kx1);
-
-		if (dia1_len_sq > dia2_len_sq)
+		if (splitfirst)
 		{
 			ps->append_poly();
 			if (path.is_inner) {