tutorial_07b.docu 1.64 KB
 Mike Kremer committed Jun 05, 2009 1 2 3 4 5 6 /** \page tutorial_07b Deleting geometry elements This small example shows how to remove faces and vertices from a mesh. We basically use the geometry created in \ref tutorial_01.  Mike Kremer committed Jan 22, 2010 7 If we want our mesh class to be able to remove vertices, faces or edges  Mike Kremer committed Jun 05, 2009 8 9 10 11 12 13 14 15 16 17 18 we have to extend the default traits for our mesh class. Vertices, faces and (half-)edges need the OpenMesh::Attributes::Status attribute which is used to hold the flag "deleted" if an element is deleted. The struct which defines the mesh traits then looks like this: \dontinclude delete_geometry.cc \skipline struct \until }; After having created the geometry of the cube one can delete faces and vertices  Mike Kremer committed Nov 27, 2009 19 by simply calling delete_vertices() (delete_faces() or delete_edges() respectively).  Mike Kremer committed Jun 05, 2009 20   Mike Kremer committed Jan 22, 2010 21 Note that there is actually no way to directly delete halfedges since they are automatically  Mike Kremer committed Jan 22, 2010 22 23 24 25 26 27 28 29 30 31 32 affected when the parent edge is marked as deleted! The status whether an element is marked as deleted can be requested by \code mesh.status(handle).deleted(); // true if element handle is marked as deleted // false otherwise \endcode where handle is either a vertex-, edge- or face-handle.  Mike Kremer committed Nov 27, 2009 33 In this example we delete all faces except one and the corresponding vertices.  Mike Kremer committed Jun 05, 2009 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 The code looks like this \dontinclude delete_geometry.cc \skipline // Delete face 0 \until mesh.delete_vertex(vhandle[3], false); Now the deleted faces and vertices are marked as "deleted" internally. Call garbage_collection() to definitely remove them from memory. \dontinclude delete_geometry.cc \skipline // Delete all \until mesh.garbage_collection(); The full source code of the example: \include delete_geometry.cc  Mike Kremer committed Nov 27, 2009 51 **/