more fixes for flatmesh

+ fix gcc warning
+ add conversion function for boost.python
+ switch build off by default due to travis build failure for Py3

CMakeLists.txt

@@ -261,7 +261,7 @@ OPTION(BUILD_JTREADER "Build the FreeCAD jt reader module" OFF)
 OPTION(BUILD_MATERIAL "Build the FreeCAD material module" ON)
 OPTION(BUILD_MESH "Build the FreeCAD mesh module" ON)
 OPTION(BUILD_MESH_PART "Build the FreeCAD mesh part module" ON)
-OPTION(BUILD_FLAT_MESH "Build the FreeCAD flat mesh module" ON)
+OPTION(BUILD_FLAT_MESH "Build the FreeCAD flat mesh module" OFF)
 OPTION(BUILD_OPENSCAD "Build the FreeCAD openscad module" ON)
 OPTION(BUILD_PART "Build the FreeCAD part module" ON)
 OPTION(BUILD_PART_DESIGN "Build the FreeCAD part design module" ON)

src/Mod/MeshPart/App/MeshFlatteningBoostPython.cpp

@@ -147,6 +147,29 @@ boost::python::list interpolateFlatFacePy(FaceUnwrapper& instance, const py::obj
     return plist;
 }
 
+boost::python::list getFlatBoundaryNodesPy(FaceUnwrapper& instance)
+{
+    std::vector<ColMat<double, 3>> mat_array = instance.getFlatBoundaryNodes();
+
+    boost::python::list ary;
+    for (auto mat : mat_array) {
+        boost::python::list plist;
+        auto cols = mat.cols();
+        auto rows = mat.rows();
+        for (int i=0; i<rows; i++) {
+            boost::python::list vec;
+            for (int j=0; j<cols; j++) {
+                double c = mat.coeff(i, j);
+                vec.append(c);
+            }
+            plist.append(vec);
+        }
+
+        ary.append(plist);
+    }
+    return ary;
+}
+
 
 
 BOOST_PYTHON_MODULE(flatmesh)
@@ -203,7 +226,7 @@ BOOST_PYTHON_MODULE(flatmesh)
         .def(py::init<ColMat<double, 3>, ColMat<long, 3>>())
         .def("findFlatNodes", &FaceUnwrapper::findFlatNodes)
         .def("interpolateFlatFace", &interpolateFlatFacePy)
-        .def("getFlatBoundaryNodes", &FaceUnwrapper::getFlatBoundaryNodes)
+        .def("getFlatBoundaryNodes", &getFlatBoundaryNodesPy)
         .def_readonly("tris", &FaceUnwrapper::tris)
         .def_readonly("nodes", &FaceUnwrapper::xyz_nodes)
         .def_readonly("uv_nodes", &FaceUnwrapper::uv_nodes)

src/Mod/MeshPart/App/MeshFlatteningLscmRelax.cpp

@@ -455,7 +455,7 @@ void LscmRelax::lscm()
     std::vector<trip> mat_triplets;
     for (auto triplet: triple_list)
     {
-        if (triplet.col() > static_cast<size_t>((this->vertices.cols() - this->fixed_pins.size()) * 2 - 1))
+        if (triplet.col() > static_cast<int>((this->vertices.cols() - this->fixed_pins.size()) * 2 - 1))
             rhs_triplets.push_back(triplet);
         else
             mat_triplets.push_back(triplet);