vtkPlanesIntersection Class Reference

#include <vtkPlanesIntersection.h>

Inheritance diagram for vtkPlanesIntersection:

[legend]

Collaboration diagram for vtkPlanesIntersection:

[legend]

List of all members.

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Detailed Description

A vtkPlanesIntersection object is a vtkPlanes object that can compute whether the arbitrary convex region bounded by it's planes intersects an axis-aligned box.

A subclass of vtkPlanes, this class determines whether it intersects an axis aligned box. This is motivated by the need to intersect the axis aligned region of a spacial decomposition of volume data with various other regions. It uses the algorithm from Graphics Gems IV, page 81.

Caveat:

An instance of vtkPlanes can be redefined by changing the planes, but this subclass then will not know if the region vertices are up to date. (Region vertices can be specified in SetRegionVertices or computed by the subclass.) So Delete and recreate if you want to change the set of planes.

Definition at line 50 of file vtkPlanesIntersection.h.

Public Member Functions
void	PrintSelf (ostream &os, vtkIndent indent)
void	SetRegionVertices (vtkPoints *pts)
void	SetRegionVertices (double *v, int nvertices)
int	GetNumRegionVertices ()
int	GetRegionVertices (double *v, int nvertices)
int	IntersectsRegion (vtkPoints *R)
Static Public Member Functions
static vtkPlanesIntersection *	New ()
static int	PolygonIntersectsBBox (double bounds[6], vtkPoints *pts)
static vtkPlanesIntersection *	Convert3DCell (vtkCell *cell)
Protected Member Functions
	vtkPlanesIntersection ()
	~vtkPlanesIntersection ()
Static Protected Member Functions
static void	ComputeNormal (double *p1, double *p2, double *p3, double normal[3])
static double	EvaluatePlaneEquation (double *x, double *p)
static void	PlaneEquation (double *n, double *x, double *p)
static int	GoodNormal (double *n)
static int	Invert3x3 (double M[3][3])

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Constructor & Destructor Documentation

vtkPlanesIntersection::vtkPlanesIntersection

(

)

[protected]

vtkPlanesIntersection::~vtkPlanesIntersection

(

)

[protected]

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Member Function Documentation

void vtkPlanesIntersection::PrintSelf	(	ostream &	os,
		vtkIndent	indent
	)			[virtual]

Methods invoked by print to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

Reimplemented from vtkPlanes.

static vtkPlanesIntersection* vtkPlanesIntersection::New

(

)

[static]

Create an object with Debug turned off, modified time initialized to zero, and reference counting on.

Reimplemented from vtkPlanes.

void vtkPlanesIntersection::SetRegionVertices

(

vtkPoints *

pts

)

It helps if you know the vertices of the convex region. If you don't, we will calculate them. Region vertices are 3-tuples.

void vtkPlanesIntersection::SetRegionVertices	(	double *	v,
		int	nvertices
	)

int vtkPlanesIntersection::GetNumRegionVertices

(

)

int vtkPlanesIntersection::GetRegionVertices	(	double *	v,
		int	nvertices
	)

int vtkPlanesIntersection::IntersectsRegion

(

vtkPoints *

R

)

Return 1 if the axis aligned box defined by R intersects the region defined by the planes, or 0 otherwise.

static int vtkPlanesIntersection::PolygonIntersectsBBox	(	double	bounds[6],
		vtkPoints *	pts
	)			[static]

A convenience function provided by this class, returns 1 if the polygon defined in pts intersects the bounding box defined in bounds, 0 otherwise. The points must define a planar polygon.

static vtkPlanesIntersection* vtkPlanesIntersection::Convert3DCell

(

vtkCell *

cell

)

[static]

Another convenience function provided by this class, returns the vtkPlanesIntersection object representing a 3D cell. The point IDs for each face must be given in counter-clockwise order from the outside of the cell.

static void vtkPlanesIntersection::ComputeNormal	(	double *	p1,
		double *	p2,
		double *	p3,
		double	normal[3]
	)			[static, protected]

static double vtkPlanesIntersection::EvaluatePlaneEquation	(	double *	x,
		double *	p
	)			[static, protected]

static void vtkPlanesIntersection::PlaneEquation	(	double *	n,
		double *	x,
		double *	p
	)			[static, protected]

static int vtkPlanesIntersection::GoodNormal

(

double *

n

)

[static, protected]

static int vtkPlanesIntersection::Invert3x3

(

double

M[3][3]

)

[static, protected]

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

• dox/Filtering/vtkPlanesIntersection.h