CGAL 5.1.2 - Triangulated Surface Mesh Simplification
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The concept EdgeCollapseSimplificationVisitor
describes the requirements for the visitor object which is used to track the edge collapse simplification algorithm.
The several callbacks given as member functions in the visitor are called from certain places in the algorithm implementation.
Types | |
typedef CGAL::Surface_mesh_simplification::Edge_profile | Edge_profile |
Convenience typedef to the Edge_profile class. | |
typedef Edge_profile::Triangle_mesh | TriangleMesh |
The type of the surface mesh to simplify. More... | |
Operations | |
void | OnStarted (TriangleMesh &surface_mesh) |
Called before the algorithm starts. | |
void | OnFinished (TriangleMesh &surface_mesh) |
Called after the algorithm finishes. | |
void | OnStopConditionReached (TriangleMesh &surface_mesh) |
Called when the StopPredicate returned true (but not if the algorithm terminates because the surface mesh could not be simplified any further). | |
void | OnCollected (const Edge_profile &profile, boost::optional< Edge_profile::FT > cost) |
Called during the collecting phase (when a cost is assigned to the edges), for each edge collected. | |
void | OnSelected (const Edge_profile &profile, boost::optional< Edge_profile::FT > cost, const Edge_profile::edges_size_type initial_edge_count, const Edge_profile::edges_size_type current_edge_count) |
Called during the processing phase (when edges are collapsed), for each edge that is selected. More... | |
void | OnCollapsing (const Edge_profile &profile, boost::optional< Edge_profile::Point > placement) |
Called when an edge is about to be collapsed and replaced by a vertex whose position is *placement . More... | |
void | OnCollapsed (const Edge_profile &profile, const Edge_profile::vertex_descriptor vd) |
Called when an edge has been collapsed and replaced by the vertex vd | |
void | OnNonCollapsable (const Edge_profile &profile) |
Called for each selected edge which cannot be collapsed because doing so would change the topological type of the surface mesh (turn it into a non-manifold for instance). | |
The type of the surface mesh to simplify.
Must be a model of the MutableFaceGraph
and HalfedgeListGraph
concepts.
void EdgeCollapseSimplificationVisitor::OnCollapsing | ( | const Edge_profile & | profile, |
boost::optional< Edge_profile::Point > | placement | ||
) |
Called when an edge is about to be collapsed and replaced by a vertex whose position is *placement
.
If placement
is absent (meaning that it could not be computed) the edge will not be collapsed.
void EdgeCollapseSimplificationVisitor::OnSelected | ( | const Edge_profile & | profile, |
boost::optional< Edge_profile::FT > | cost, | ||
const Edge_profile::edges_size_type | initial_edge_count, | ||
const Edge_profile::edges_size_type | current_edge_count | ||
) |
Called during the processing phase (when edges are collapsed), for each edge that is selected.
This method is called before the algorithm checks if the edge is collapsable.
cost
indicates the current collapse cost for the edge. If absent (meaning that it could not be computed) the edge will not be collapsed.
initial_edge_count
and current_edge_count
refer to the number of edges.