add vcglib

vcglib/apps/sample/trimesh_optional/trimesh_optional_ocf.cpp

@@ -0,0 +1,31 @@
+#include <vector>
+#include <vcg/simplex/vertex/base.h>   
+#include <vcg/simplex/vertex/component_occ.h>  
+#include <vcg/simplex/face/base.h>   
+#include <vcg/simplex/face/component.h>   
+
+#include <vcg/complex/complex.h>   
+
+#include<vcg/complex/algorithms/create/platonic.h>
+
+class MyEdge;
+class MyFace;
+
+class MyVertex: public vcg::VertexSimp2<MyVertex,MyEdge,MyFace, vcg::vert::InfoOcf,vcg::vert::Coord3d, vcg::vert::Normal3fOcc>{};
+class MyFace: public vcg::FaceSimp2<MyVertex,MyEdge,MyFace,vcg::face::VertexRef>{};
+class MyMesh: public vcg::tri::TriMesh< vcg::vert::vector_occ<MyVertex>, std::vector<MyFace> >{};
+
+int main()
+{
+ MyMesh m;
+ vcg::tri::Tetrahedron(m);
+ MyMesh::VertexIterator vi = m.vert.begin();
+
+ (*vi).N() = vcg::Point3f(1.0,1.0,1.0); // ERROR   
+ m.vert.EnableAttribute<vcg::vert::Normal3fOcc::NormalType>(); // this allocate the memory to store the normal
+ (*vi).N() = vcg::Point3f(1.0,1.0,1.0); // OK
+ m.vert.DisableAttribute<vcg::vert::Normal3fOcc::NormalType>(); // this deallocate the memory to store the normal
+
+ (*vi).N() = vcg::Point3f(1.0,1.0,1.0); // ERROR  (again)! 
+ return 0;
+}