CGAL 6.1.2 - Triangulated Surface Mesh Simplification: GetPlacement Concept Reference

CGAL 6.1.2 - Triangulated Surface Mesh Simplification

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GetPlacement Concept Reference
Reference Manual » Concepts

## Definition

The concept `GetPlacement` describes the requirements for the policy function object which gets the collapse placement of an edge, that is, the new position of the vertex that remains after a halfedge-collapse operation.

The placement returned is a `std::optional` value (i.e., it can be absent). An absent result indicates that the edge should not be collapsed. This could be the result of a computational limitation (such as an overflow), or can be intentionally returned to prevent the edge from being collapsed.

Refines
  `DefaultConstructible`
  `CopyConstructible`

Has models
  `CGAL::Surface_mesh_simplification::Midpoint_placement<TriangleMesh>`
  `CGAL::Surface_mesh_simplification::LindstromTurk_placement<TriangleMesh>`
  `CGAL::Surface_mesh_simplification::GarlandHeckbert_policies<TriangleMesh, GeomTraits>`
  `CGAL::Surface_mesh_simplification::Bounded_normal_change_placement<Placement>`
  `CGAL::Surface_mesh_simplification::Constrained_placement<Placement>`

## Public Types
typedef CGAL::Surface_mesh_simplification::Edge_profile | Edge_profile
| The class `Edge_profile` regroups useful information about an edge, such as its incident vertices and faces.

## Operations
std::optional< Edge_profile::Point > | operator() (const Edge_profile &profile) const
| Computes and returns the placement, that is, the position of the vertex which replaces the collapsing edge (represented by its profile).