Remove final dynamic_cast with better solution.

ObjectTypes/VolumeMeshObject/VolumeMeshNodeT.cc

@@ -56,6 +56,7 @@
 #include <ACG/GL/gl.hh>
 #include <ACG/Utils/VSToolsT.hh>
 #include <vector>
+#include <type_traits>
 
 #include <ACG/GL/RenderObject.hh>
 #include <ACG/GL/VertexDeclaration.hh>
@@ -206,7 +207,7 @@ DrawModes::DrawMode VolumeMeshNodeT<VolumeMeshT>::availableDrawModes() const {
         if (colorAttrib_.edge_colors_available())
             result |= drawModes_.edgesColoredPerEdge;
 
-        if (dynamic_cast<const HexahedralMeshTopologyKernel*>(&mesh_) != NULL)
+        if (std::is_base_of<HexahedralMeshTopologyKernel, VolumeMeshT>::value)
         {
             result |= drawModes_.irregularInnerEdges;
             result |= drawModes_.irregularOuterEdges;