FEM: add getNodesBySolid()

Conflicts:
	src/Mod/Fem/App/FemMesh.cpp

src/Mod/Fem/App/FemMesh.cpp

@@ -524,6 +524,45 @@ std::map<int, int> FemMesh::getccxVolumesByFace(const TopoDS_Face &face) const
     return result;
 }
 
+std::set<int> FemMesh::getNodesBySolid(const TopoDS_Solid &solid) const
+{
+    std::set<int> result;
+
+    Bnd_Box box;
+    BRepBndLib::Add(solid, box);
+    // limit where the mesh node belongs to the solid:
+    double limit = box.SquareExtent()/10000.0;
+    //double limit = BRep_Tool::Tolerance(solid);   // does not compile --> no matching function for call to 'BRep_Tool::Tolerance(const TopoDS_Solid&)'
+    box.Enlarge(limit);
+
+    // get the current transform of the FemMesh
+    const Base::Matrix4D Mtrx(getTransform());
+
+    SMDS_NodeIteratorPtr aNodeIter = myMesh->GetMeshDS()->nodesIterator();
+    while (aNodeIter->more()) {
+        const SMDS_MeshNode* aNode = aNodeIter->next();
+        Base::Vector3d vec(aNode->X(),aNode->Y(),aNode->Z());
+        // Apply the matrix to hold the BoundBox in absolute space.
+        vec = Mtrx * vec;
+
+        if (!box.IsOut(gp_Pnt(vec.x,vec.y,vec.z))) {
+            // create a vertex
+            BRepBuilderAPI_MakeVertex aBuilder(gp_Pnt(vec.x,vec.y,vec.z));
+            TopoDS_Shape s = aBuilder.Vertex();
+            // measure distance
+            BRepExtrema_DistShapeShape measure(solid,s);
+            measure.Perform();
+            if (!measure.IsDone() || measure.NbSolution() < 1)
+                continue;
+
+            if (measure.Value() < limit)
+                result.insert(aNode->GetID());
+        }
+    }
+
+    return result;
+}
+
 std::set<int> FemMesh::getNodesByFace(const TopoDS_Face &face) const
 {
     std::set<int> result;

src/Mod/Fem/App/FemMesh.h

@@ -39,6 +39,7 @@ class TopoDS_Shape;
 class TopoDS_Face;
 class TopoDS_Edge;
 class TopoDS_Vertex;
+class TopoDS_Solid;
 
 namespace Fem
 {
@@ -87,6 +88,8 @@ public:
     //@{
     /// retrieving by region growing
     std::set<long> getSurfaceNodes(long ElemId, short FaceId, float Angle=360)const;
+    /// retrieving by solid
+    std::set<int> getNodesBySolid(const TopoDS_Solid &solid) const;
     /// retrieving by face
     std::set<int> getNodesByFace(const TopoDS_Face &face) const;
     /// retrieving by edge

src/Mod/Fem/App/FemMeshPy.xml

@@ -99,6 +99,11 @@
         <UserDocu>Get the node position vector by an Node-ID</UserDocu>
       </Documentation>
     </Methode>
+    <Methode Name="getNodesBySolid" Const="true">
+      <Documentation>
+        <UserDocu>Return a list of node IDs which belong to a TopoSolid</UserDocu>
+      </Documentation>
+    </Methode>
     <Methode Name="getNodesByFace" Const="true">
       <Documentation>
         <UserDocu>Return a list of node IDs which belong to a TopoFace</UserDocu>

src/Mod/Fem/App/FemMeshPyImp.cpp

@@ -38,6 +38,7 @@
 #include <Base/QuantityPy.h>
 
 #include <Mod/Part/App/TopoShapePy.h>
+#include <Mod/Part/App/TopoShapeSolidPy.h>
 #include <Mod/Part/App/TopoShapeFacePy.h>
 #include <Mod/Part/App/TopoShapeEdgePy.h>
 #include <Mod/Part/App/TopoShapeVertexPy.h>
@@ -611,6 +612,34 @@ PyObject* FemMeshPy::getNodeById(PyObject *args)
     }
 }
 
+PyObject* FemMeshPy::getNodesBySolid(PyObject *args)
+{
+    PyObject *pW;
+    if (!PyArg_ParseTuple(args, "O!", &(Part::TopoShapeSolidPy::Type), &pW))
+         return 0;
+
+    try {
+        const TopoDS_Shape& sh = static_cast<Part::TopoShapeSolidPy*>(pW)->getTopoShapePtr()->_Shape;
+        const TopoDS_Solid& fc = TopoDS::Solid(sh);
+        if (sh.IsNull()) {
+            PyErr_SetString(Base::BaseExceptionFreeCADError, "Solid is empty");
+            return 0;
+        }
+        Py::List ret;
+        std::set<int> resultSet = getFemMeshPtr()->getNodesBySolid(fc);
+        for (std::set<int>::const_iterator it = resultSet.begin();it!=resultSet.end();++it)
+            ret.append(Py::Int(*it));
+
+        return Py::new_reference_to(ret);
+
+    }
+    catch (Standard_Failure) {
+        Handle_Standard_Failure e = Standard_Failure::Caught();
+        PyErr_SetString(Base::BaseExceptionFreeCADError, e->GetMessageString());
+        return 0;
+    }
+}
+
 PyObject* FemMeshPy::getNodesByFace(PyObject *args)
 {
     PyObject *pW;