9503f39f18
git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@265 fdac6126-5c0c-442c-9429-916003d36597
52 lines
1.6 KiB
Plaintext
52 lines
1.6 KiB
Plaintext
/** \page tutorial_07b Deleting geometry elements
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This small example shows how to remove faces and vertices from a mesh.
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We basically use the geometry created in \ref tutorial_01.
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If we want our mesh class to be able to remove vertices, faces or edges
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we have to extend the default traits for our mesh class.
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Vertices, faces and (half-)edges need the OpenMesh::Attributes::Status attribute
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which is used to hold the flag "deleted" if an element is deleted.
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The struct which defines the mesh traits then looks like this:
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\dontinclude delete_geometry.cc
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\skipline struct
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\until };
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After having created the geometry of the cube one can delete faces and vertices
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by simply calling delete_vertices() (delete_faces() or delete_edges() respectively).
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Note that there is actually no way to directly delete halfedges since they are automatically
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affected when the parent edge is marked as deleted!
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The status whether an element is marked as deleted can be requested by
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\code
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mesh.status(handle).deleted(); // true if element handle is marked as deleted
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// false otherwise
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\endcode
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where handle is either a vertex-, edge- or face-handle.
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In this example we delete all faces except one and the corresponding vertices.
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The code looks like this
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\dontinclude delete_geometry.cc
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\skipline // Delete face 0
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\until mesh.delete_vertex(vhandle[3], false);
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Now the deleted faces and vertices are marked as "deleted" internally.
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Call garbage_collection() to definitely remove them from memory.
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\dontinclude delete_geometry.cc
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\skipline // Delete all
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\until mesh.garbage_collection();
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The full source code of the example:
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\include delete_geometry.cc
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**/
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