Axis Aligned Bounding Box tree of mesh cells. More...

#include <geogram/mesh/mesh_AABB.h>

Inheritance diagram for GEO::MeshCellsAABB:

Public Member Functions
	MeshCellsAABB ()
	MeshCellsAABB constructor. More...

	MeshCellsAABB (Mesh &M, bool reorder=true)
	Creates the Axis Aligned Bounding Boxes tree. More...

void	initialize (Mesh &M, bool reorder=true)
	Initializes the Axis Aligned Bounding Boxes tree. More...

index_t	containing_tet (const vec3 &p) const
	Finds the index of a tetrahedron that contains a query point. More...

void	compute_bbox_cell_bbox_intersections (const Box &box_in, std::function< void(index_t)> action) const
	Computes all the intersections between a given box and the bounding boxes of all the cells. More...

void	containing_boxes (const vec3 &p, std::function< void(index_t)> action) const
	Finds all the cells such that their bounding box contain a point. More...

void	compute_cell_bbox_intersections (std::function< void(index_t, index_t)> action) const
	Computes all the pairs of intersecting cells. More...

void	compute_other_cell_bbox_intersections (MeshCellsAABB *other, std::function< void(index_t, index_t)> action) const
	Computes all the pairs of intersecting cells between this AABB and another one. More...

Public Member Functions inherited from GEO::MeshAABB3d
	MeshAABB3d ()
	MeshAABB3d constructor.

const Mesh *	mesh () const
	Gets the mesh. More...

Static Public Attributes
static const index_t	NO_TET = index_t(-1)
	Symbolic constant for indicating that there is no containing tetrahedron. More...

Protected Member Functions
index_t	containing_tet_recursive (const vec3 &p, index_t n, index_t b, index_t e) const
	The recursive function used by the implementation of containing_tet(). More...

void	containing_bboxes_recursive (std::function< void(index_t)> action, const vec3 &p, index_t node, index_t b, index_t e) const
	Computes all the cells that have a bbox that contain a given point in a sub-tree of the AABB tree. More...

Protected Member Functions inherited from GEO::AABB< BOX >
void	initialize (index_t nb, std::function< void(BOX &, index_t)> get_bbox)
	Initializes this AABB. More...

void	bbox_intersect_recursive (std::function< void(index_t)> action, const BOX &box, index_t node, index_t b, index_t e) const
	Computes all the elements that have a bbox that intersects a given bbox in a sub-tree of the AABB tree. More...

void	self_intersect_recursive (std::function< void(index_t, index_t)> action, index_t node1, index_t b1, index_t e1, index_t node2, index_t b2, index_t e2) const
	Computes all the pairs of intersecting elements for two sub-trees of the AABB tree. More...

void	other_intersect_recursive (std::function< void(index_t, index_t)> action, index_t node1, index_t b1, index_t e1, const AABB< BOX > *other, index_t node2, index_t b2, index_t e2) const
	Computes all the pairs of intersecting elements for two sub-trees of two AABB trees. More...

void	init_bboxes_recursive (index_t node_index, index_t b, index_t e, std::function< void(BOX &, index_t)> get_bbox)
	Computes the hierarchy of bounding boxes recursively. More...

Additional Inherited Members
Static Protected Member Functions inherited from GEO::AABB< BOX >
static index_t	max_node_index (index_t node_index, index_t b, index_t e)
	Computes the maximum node index in a subtree. More...

Protected Attributes inherited from GEO::MeshAABB3d
Mesh *	mesh_

Protected Attributes inherited from GEO::AABB< BOX >
index_t	nb_

vector< BOX >	bboxes_

Detailed Description

Axis Aligned Bounding Box tree of mesh cells.

Used to quickly find the tetrahedron that contains a given 3d point.

Definition at line 731 of file mesh_AABB.h.

Constructor & Destructor Documentation

◆ MeshCellsAABB() [1/2]

GEO::MeshCellsAABB::MeshCellsAABB ( )

MeshCellsAABB constructor.

Creates an uninitialized MeshCellsAABB.

◆ MeshCellsAABB() [2/2]

GEO::MeshCellsAABB::MeshCellsAABB	(	Mesh &	M,
		bool	reorder = `true`
	)

Creates the Axis Aligned Bounding Boxes tree.

Parameters

[in]	M	the input mesh. It can be modified, The cells are re-ordered (using Morton's order, see mesh_reorder()).
[in]	reorder	if not set, Morton re-ordering is skipped (but it means that mesh_reorder() was previously called else the algorithm will be pretty unefficient).

Member Function Documentation

◆ compute_bbox_cell_bbox_intersections()

void GEO::MeshCellsAABB::compute_bbox_cell_bbox_intersections	(	const Box &	box_in,
		std::function< void(index_t)>	action
	)		const

inline

Computes all the intersections between a given box and the bounding boxes of all the cells.

Parameters

[in] action a function that takes as argument an index_t (cell index) invoked for all cells that have a bounding box that intersects box_in.

Definition at line 789 of file mesh_AABB.h.

◆ compute_cell_bbox_intersections()

void GEO::MeshCellsAABB::compute_cell_bbox_intersections ( std::function< void(index_t, index_t)> action ) const

inline

Computes all the pairs of intersecting cells.

Parameters

[in] action is a function that takes two index_t's, invoked of all pairs of cells that have overlapping bounding boxes. Further processing is necessary to detect actual cell intersections.

Definition at line 820 of file mesh_AABB.h.

◆ compute_other_cell_bbox_intersections()

void GEO::MeshCellsAABB::compute_other_cell_bbox_intersections	(	MeshCellsAABB *	other,
		std::function< void(index_t, index_t)>	action
	)		const

inline

Computes all the pairs of intersecting cells between this AABB and another one.

Parameters

[in]	action	is a function that takes two index_t's, invoked of all pairs of cells that have overlapping bounding boxes. Further processing is necessary to detect actual cell intersections.
[in]	other	the other AABB.

Definition at line 839 of file mesh_AABB.h.

◆ containing_bboxes_recursive()

void GEO::MeshCellsAABB::containing_bboxes_recursive	(	std::function< void(index_t)>	action,
		const vec3 &	p,
		index_t	node,
		index_t	b,
		index_t	e
	)		const

inlineprotected

Computes all the cells that have a bbox that contain a given point in a sub-tree of the AABB tree.

Note that the tree structure is completely implicit, therefore the bounds of the (continuous) facet indices sequences that correspond to the facets contained in the two nodes are sent as well as the node indices.

Parameters

[in]	action	a function that takes an index_t that is invoked for all cells that has a bounding box that contains `p`.
[in]	p	a const reference to the query point
[in]	node	index of the first node of the AABB tree
[in]	b	index of the first facet in `node`
[in]	e	one position past the index of the last facet in `node`

Definition at line 889 of file mesh_AABB.h.

◆ containing_boxes()

void GEO::MeshCellsAABB::containing_boxes	(	const vec3 &	p,
		std::function< void(index_t)>	action
	)		const

inline

Finds all the cells such that their bounding box contain a point.

Parameters

[in] action a function that takes an index_t that is invoked for all cells that have a bounding box that contains p.

Definition at line 805 of file mesh_AABB.h.

◆ containing_tet()

index_t GEO::MeshCellsAABB::containing_tet ( const vec3 & p ) const

inline

Finds the index of a tetrahedron that contains a query point.

Parameters

[in] p a const reference to the query point

Returns: the index of one of the tetrahedra that contains p or NO_TET if p is outside the mesh.

Note: The input mesh needs to be tetrahedralized. If the mesh has arbitrary cells, then one may use instead containing_boxes().

Definition at line 775 of file mesh_AABB.h.

◆ containing_tet_recursive()

index_t GEO::MeshCellsAABB::containing_tet_recursive	(	const vec3 &	p,
		index_t	n,
		index_t	b,
		index_t	e
	)		const

protected

The recursive function used by the implementation of containing_tet().

Parameters

[in]	p	a const reference to the query point
[in]	n	index of the current node in the AABB tree
[in]	b	index of the first tet in the subtree under node `n`
[in]	e	one position past the index of the last tet in the subtree under node `n`

Returns: the index of one of the tetrahedra that contains p, or NO_TET if p is outside the mesh.

◆ initialize()

void GEO::MeshCellsAABB::initialize	(	Mesh &	M,
		bool	reorder = `true`
	)

Initializes the Axis Aligned Bounding Boxes tree.

Parameters

[in]	M	the input mesh. It can be modified, The cells are re-ordered (using Morton's order, see mesh_reorder()).
[in]	reorder	if not set, Morton re-ordering is skipped (but it means that mesh_reorder() was previously called else the algorithm will be pretty unefficient).

Member Data Documentation

◆ NO_TET

const index_t GEO::MeshCellsAABB::NO_TET = index_t(-1)

static

Symbolic constant for indicating that there is no containing tetrahedron.

See also: containing_tet()

Definition at line 739 of file mesh_AABB.h.

The documentation for this class was generated from the following file:

geogram/mesh/mesh_AABB.h

Public Member Functions

Static Public Attributes

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ MeshCellsAABB() [1/2]

◆ MeshCellsAABB() [2/2]

Member Function Documentation

◆ compute_bbox_cell_bbox_intersections()

◆ compute_cell_bbox_intersections()

◆ compute_other_cell_bbox_intersections()

◆ containing_bboxes_recursive()

◆ containing_boxes()

◆ containing_tet()

◆ containing_tet_recursive()

◆ initialize()

Member Data Documentation

◆ NO_TET