Geogram
Version 1.9.1
A programming library of geometric algorithms
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Multithreaded implementation of Delaunay in 3d. More...
#include <geogram/delaunay/parallel_delaunay_3d.h>
Public Member Functions | |
ParallelDelaunay3d (coord_index_t dimension=3) | |
Constructs a new ParallelDelaunay3d. More... | |
void | set_vertices (index_t nb_vertices, const double *vertices) override |
Sets the vertices of this Delaunay, and recomputes the cells. More... | |
index_t | nearest_vertex (const double *p) const override |
Computes the nearest vertex from a query point. More... | |
void | set_BRIO_levels (const vector< index_t > &levels) override |
Specifies the bounds of each level to be used when hierarchic ordering is specified from outside. More... | |
Public Member Functions inherited from GEO::Delaunay | |
coord_index_t | dimension () const |
Gets the dimension of this Delaunay. More... | |
index_t | cell_size () const |
Gets the number of vertices in each cell. More... | |
void | set_reorder (bool x) |
Specifies whether vertices should be reordered. More... | |
const double * | vertices_ptr () const |
Gets a pointer to the array of vertices. More... | |
const double * | vertex_ptr (index_t i) const |
Gets a pointer to a vertex by its global index. More... | |
index_t | nb_vertices () const |
Gets the number of vertices. More... | |
virtual bool | supports_constraints () const |
Tests whether constraints are supported by this Delaunay. More... | |
virtual void | set_constraints (const Mesh *mesh) |
Defines the constraints. More... | |
void | set_refine (bool x) |
Specifies whether the mesh should be refined. More... | |
bool | get_refine () const |
Tests whether mesh refinement is selected. More... | |
void | set_quality (double qual) |
Specifies the desired quality for mesh elements when refinement is enabled (. More... | |
const Mesh * | constraints () const |
Gets the constraints. More... | |
index_t | nb_cells () const |
Gets the number of cells. More... | |
index_t | nb_finite_cells () const |
Gets the number of finite cells. More... | |
const signed_index_t * | cell_to_v () const |
Gets a pointer to the cell-to-vertex incidence array. More... | |
const signed_index_t * | cell_to_cell () const |
Gets a pointer to the cell-to-cell adjacency array. More... | |
signed_index_t | cell_vertex (index_t c, index_t lv) const |
Gets a vertex index by cell index and local vertex index. More... | |
signed_index_t | cell_adjacent (index_t c, index_t lf) const |
Gets an adjacent cell index by cell index and local facet index. More... | |
bool | cell_is_infinite (index_t c) const |
Tests whether a cell is infinite. More... | |
bool | cell_is_finite (index_t c) const |
Tests whether a cell is finite. More... | |
index_t | index (index_t c, signed_index_t v) const |
Retrieves a local vertex index from cell index and global vertex index. More... | |
index_t | adjacent_index (index_t c1, index_t c2) const |
Retrieves a local facet index from two adacent cell global indices. More... | |
signed_index_t | vertex_cell (index_t v) const |
Gets an incident cell index by a vertex index. More... | |
signed_index_t | next_around_vertex (index_t c, index_t lv) const |
Traverses the list of cells incident to a vertex. More... | |
void | get_neighbors (index_t v, vector< index_t > &neighbors) const |
Gets the one-ring neighbors of vertex v. More... | |
void | save_histogram (std::ostream &out) const |
Saves the histogram of vertex degree (can be visualized with gnuplot). More... | |
bool | stores_neighbors () const |
Tests whether neighbors are stored. More... | |
void | set_stores_neighbors (bool x) |
Specifies whether neighbors should be stored. More... | |
bool | stores_cicl () const |
Tests whether incident tetrahedra lists are stored. More... | |
void | set_stores_cicl (bool x) |
Specifies whether incident tetrahedra lists should be stored. More... | |
bool | keeps_infinite () const |
Tests whether infinite elements are kept. More... | |
void | set_keeps_infinite (bool x) |
Sets whether infinite elements should be kept. More... | |
bool | thread_safe () const |
Tests whether thread-safe mode is active. More... | |
void | set_thread_safe (bool x) |
Specifies whether thread-safe mode should be used. More... | |
void | set_default_nb_neighbors (index_t x) |
Sets the default number of stored neighbors. More... | |
index_t | default_nb_neighbors () const |
Gets the default number of stored neighbors. More... | |
void | clear_neighbors () |
Frees all memory used for neighbors storage. | |
void | set_keep_regions (bool x) |
Specifies whether all internal regions should be kept. More... | |
virtual index_t | region (index_t t) const |
Gets the region id associated with a tetrahedron. More... | |
virtual void | store_neighbors_CB (index_t i) |
Stores the neighbors of a vertex. More... | |
Public Member Functions inherited from GEO::Counted | |
void | ref () const |
Increments the reference count. More... | |
void | unref () const |
Decrements the reference count. More... | |
bool | is_shared () const |
Check if the object is shared. More... | |
int | nb_refs () const |
Gets the number of references that point to this object. More... | |
Friends | |
class | Delaunay3dThread |
Additional Inherited Members | |
Static Public Member Functions inherited from GEO::Delaunay | |
static Delaunay * | create (coord_index_t dim, const std::string &name="default") |
Creates a Delaunay triangulation of the specified dimension. More... | |
static void | initialize () |
This function needs to be called once before using the Delaunay class. More... | |
Static Public Member Functions inherited from GEO::Counted | |
static void | ref (const Counted *counted) |
Increments the reference count. More... | |
static void | unref (const Counted *counted) |
Decrements the reference count. More... | |
Protected Member Functions inherited from GEO::Delaunay | |
Delaunay (coord_index_t dimension) | |
Creates a new Delaunay triangulation. More... | |
~Delaunay () override | |
Delaunay destructor. | |
virtual void | get_neighbors_internal (index_t v, vector< index_t > &neighbors) const |
Internal implementation for get_neighbors (with vector). More... | |
virtual void | set_arrays (index_t nb_cells, const signed_index_t *cell_to_v, const signed_index_t *cell_to_cell) |
Sets the arrays that represent the combinatorics of this Delaunay. More... | |
virtual void | update_v_to_cell () |
Stores for each vertex v a cell incident to v. | |
virtual void | update_cicl () |
Updates the circular incident cell lists. More... | |
virtual void | update_neighbors () |
Computes the stored neighbor lists. | |
void | set_next_around_vertex (index_t c1, index_t lv, index_t c2) |
Sets the circular incident edge list. More... | |
void | set_dimension (coord_index_t dim) |
Sets the dimension of this Delaunay. More... | |
Protected Member Functions inherited from GEO::Counted | |
Counted () | |
Creates a reference counted object. More... | |
virtual | ~Counted () |
Destroys a reference counted object. More... | |
Protected Attributes inherited from GEO::Delaunay | |
coord_index_t | dimension_ |
index_t | vertex_stride_ |
index_t | cell_size_ |
index_t | cell_v_stride_ |
index_t | cell_neigh_stride_ |
const double * | vertices_ |
index_t | nb_vertices_ |
index_t | nb_cells_ |
const signed_index_t * | cell_to_v_ |
const signed_index_t * | cell_to_cell_ |
vector< signed_index_t > | v_to_cell_ |
vector< signed_index_t > | cicl_ |
bool | is_locked_ |
PackedArrays | neighbors_ |
bool | store_neighbors_ |
index_t | default_nb_neighbors_ |
bool | do_reorder_ |
If true, uses BRIO reordering (in some implementations) | |
const Mesh * | constraints_ |
bool | refine_ |
double | quality_ |
bool | store_cicl_ |
It true, circular incident tet lists are stored. | |
bool | keep_infinite_ |
If true, infinite vertex and infinite simplices are kept. | |
index_t | nb_finite_cells_ |
If keep_infinite_ is true, then finite cells are 0..nb_finite_cells_-1 and infinite cells are nb_finite_cells_ ... nb_cells_. | |
bool | keep_regions_ |
Related Functions inherited from GEO::Delaunay | |
typedef SmartPointer< Delaunay > | Delaunay_var |
Smart pointer that refers to a Delaunay object. | |
typedef Factory1< Delaunay, coord_index_t > | DelaunayFactory |
Delaunay Factory. More... | |
Multithreaded implementation of Delaunay in 3d.
This class is based on ideas and a prototype implementation by Alain Filbois. This class also uses concepts inspired by two triangulation softwares, CGAL and tetgen, described in the following references. This package follows the idea used in CGAL of traversing the cavity from inside, since it traverses less tetrahedra than when traversing from outside.
Note that the algorithm here does not support vertex deletion nor degenerate input with all coplanar or all colinear points (use CGAL instead if you have these requirements).
The core algorithm used in both this code, CGAL and tetgen was independently and simultaneously discovered by Bowyer and Watson:
The spatial reordering method, that dramatically increases the performances, also used in this code, CGAL and tetgen was introduced in the following references. The second one is a smart implementation based on the std::nth_element() function of the STL, that inspired the compute_BRIO_ordering() function of this package.
The locate() function is based on the following two references. The first one randomizes the choice of the next tetrahedron. The second one uses an inexact locate() function to initialize the exact one (it is called "structural filtering"). The first idea is used in both CGAL and tetgen, and the second one is used in CGAL.
Definition at line 106 of file parallel_delaunay_3d.h.
GEO::ParallelDelaunay3d::ParallelDelaunay3d | ( | coord_index_t | dimension = 3 | ) |
Constructs a new ParallelDelaunay3d.
[in] | dimension | dimension of the triangulation (3 or 4). If dimension = 4, this creates a regular triangulation (dual of a power diagram). In this case:
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overridevirtual |
Computes the nearest vertex from a query point.
[in] | p | query point |
Reimplemented from GEO::Delaunay.
Specifies the bounds of each level to be used when hierarchic ordering is specified from outside.
This function is used by some implementation when set_reorder(false) was called.
[in] | levels | specifies the bounds of each level used by the hierarchical index. First level has indices between levels[0] ... levels[1]. |
Reimplemented from GEO::Delaunay.
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overridevirtual |
Sets the vertices of this Delaunay, and recomputes the cells.
[in] | nb_vertices | number of vertices |
[in] | vertices | a pointer to the coordinates of the vertices, as a contiguous array of doubles |
Reimplemented from GEO::Delaunay.