Subdivision: Add example for Linear_mask_3

Subdivision_method_3/doc/Subdivision_method_3/examples.txt

@@ -2,6 +2,7 @@
 \example Subdivision_method_3/Customized_subdivision.cpp
 \example Subdivision_method_3/CatmullClark_subdivision.cpp
 \example Subdivision_method_3/DooSabin_subdivision.cpp
+\example Subdivision_method_3/Linear_subdivision.cpp
 \example Subdivision_method_3/Loop_subdivision.cpp
 \example Subdivision_method_3/Sqrt3_subdivision.cpp
 */

Subdivision_method_3/examples/Subdivision_method_3/Linear_subdivision.cpp

@@ -0,0 +1,34 @@
+#include <CGAL/Simple_cartesian.h>
+
+#include <CGAL/Surface_mesh.h>
+#include <CGAL/Polygon_mesh_processing/IO/polygon_mesh_io.h>
+
+#include <CGAL/subdivision_method_3.h>
+
+#include <iostream>
+#include <fstream>
+
+typedef CGAL::Simple_cartesian<double>          Kernel;
+typedef CGAL::Surface_mesh<Kernel::Point_3>     Surface_mesh;
+
+namespace PMP = CGAL::Polygon_mesh_processing;
+
+int main(int argc, char* argv[]) {
+
+  const std::string filename = (argc > 1) ? argv[1] : CGAL::data_file_path("meshes/cube_quad.off");
+
+  Surface_mesh mesh;
+  if(!PMP::IO::read_polygon_mesh(filename, mesh))
+  {
+    std::cerr << "Invalid input." << std::endl;
+    return 1;
+  }
+
+  CGAL::Linear_mask_3<Surface_mesh> mask(&mesh);
+  CGAL::Subdivision_method_3::PQQ(mesh, mask, CGAL::parameters::number_of_iterations(2));
+
+  std::ofstream out("out.off");
+  out << mesh;
+
+  return 0;
+}

Subdivision_method_3/include/CGAL/Subdivision_method_3/subdivision_masks_3.h

@@ -88,7 +88,7 @@ public:
 
 public:
   Linear_mask_3(Mesh* pmesh)
-    : Base(pmesh, get(vertex_point, pmesh))
+    : Base(pmesh, get(vertex_point, *pmesh))
   { }
 
   Linear_mask_3(Mesh* pmesh, VertexPointMap vpmap)