Example for locking vertices in decimater

git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@1224 fdac6126-5c0c-442c-9429-916003d36597

Doc/decimater.docu

@@ -27,6 +27,24 @@
   \attention The decimater sets temporarily the status bit 'tagged' and
   clears it after usage regardless of a previous state.
 
+\section DecimaterLock Block vertices from beeing touched by the Decimater
+  You could mark vertices as locked, which should not be modified by the decimater.
+
+  \code
+    // That might be already requested
+    mesh_->request_vertex_status();
+
+    // Get an iterator over all halfedges
+    Mesh::HalfedgeIter he_it, he_end=mesh_->halfedges_end();
+
+    // If halfedge is boundary, lock the corresponding vertices
+    for (he_it = mesh_->halfedges_begin(); he_it != he_end ; ++he_it)
+      if (mesh_->is_boundary(*he_it) ) {
+         mesh_->status(_mesh->to_vertex_handle(*he_it)).set_locked(true);
+         mesh_->status(_mesh->from_vertex_handle(*he_it)).set_locked(true);
+      }
+  \endcode
+
 \section DecimaterMod Decimating Modules
 
   The vertex to be removed is determined by a decimation module, which has