Correct the corner detection

src/parameterization/barycentric/BarycentricMapping.cpp

@@ -170,7 +170,7 @@ void QuadBorderParameterization::setCornersAuto(const Mesh & mesh) {
       const Coord3D n1 = mesh.computeTriangleNormal(mesh.findTriangle((*p).getId(), nbbd[0]).getId());
       const Coord3D n2 = mesh.computeTriangleNormal(mesh.findTriangle((*p).getId(), nbbd[1]).getId());
       const double angle2 = fabs(Coord3D::angleVector(n1, n2));
-      valueList.push_back(std::pair<VertexID, double>((*p).getId(), angle1 - angle2));
+      valueList.push_back(std::pair<VertexID, double>((*p).getId(), angle1 + angle2));
     }