a superclass for ray casting functions More...

#include <vtkUnstructuredGridBunykRayCastFunction.h>

Inheritance diagram for vtkUnstructuredGridBunykRayCastFunction:

Collaboration diagram for vtkUnstructuredGridBunykRayCastFunction:

Classes
class	Intersection

class	Triangle

Public Types
typedef vtkUnstructuredGridVolumeRayCastFunction	Superclass

Public Types inherited from vtkUnstructuredGridVolumeRayCastFunction
typedef vtkObject	Superclass

Public Types inherited from vtkObject
typedef vtkObjectBase	Superclass

Public Member Functions
virtual int	IsA (const char *type)

vtkUnstructuredGridBunykRayCastFunction *	NewInstance () const

virtual void	PrintSelf (ostream &os, vtkIndent indent)

virtual void	Initialize (vtkRenderer ren, vtkVolume vol)

virtual void	Finalize ()

virtual vtkUnstructuredGridVolumeRayCastIterator *	NewIterator ()

double *	GetPoints ()

Triangle **	GetTetraTriangles ()

Intersection *	GetIntersectionList (int x, int y)


int	InTriangle (double x, double y, Triangle *triPtr)


virtual vtkMatrix4x4 *	GetViewToWorldMatrix ()


virtual int *	GetImageOrigin ()

virtual void	GetImageOrigin (int data[2])


virtual int *	GetImageViewportSize ()

virtual void	GetImageViewportSize (int data[2])

Public Member Functions inherited from vtkUnstructuredGridVolumeRayCastFunction
vtkUnstructuredGridVolumeRayCastFunction *	NewInstance () const

Public Member Functions inherited from vtkObject
vtkObject *	NewInstance () const

virtual void	DebugOn ()

virtual void	DebugOff ()

bool	GetDebug ()

void	SetDebug (bool debugFlag)

virtual void	Modified ()

virtual unsigned long	GetMTime ()

unsigned long	AddObserver (unsigned long event, vtkCommand *, float priority=0.0f)

unsigned long	AddObserver (const char event, vtkCommand , float priority=0.0f)

vtkCommand *	GetCommand (unsigned long tag)

void	RemoveObserver (vtkCommand *)

void	RemoveObservers (unsigned long event, vtkCommand *)

void	RemoveObservers (const char event, vtkCommand )

int	HasObserver (unsigned long event, vtkCommand *)

int	HasObserver (const char event, vtkCommand )

void	RemoveObserver (unsigned long tag)

void	RemoveObservers (unsigned long event)

void	RemoveObservers (const char *event)

void	RemoveAllObservers ()

int	HasObserver (unsigned long event)

int	HasObserver (const char *event)

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, void(T::*callback)(), float priority=0.0f)

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, void(T::callback)(vtkObject , unsigned long, void *), float priority=0.0f)

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, bool(T::callback)(vtkObject , unsigned long, void *), float priority=0.0f)

int	InvokeEvent (unsigned long event, void *callData)

int	InvokeEvent (const char event, void callData)

int	InvokeEvent (unsigned long event)

int	InvokeEvent (const char *event)

Public Member Functions inherited from vtkObjectBase
const char *	GetClassName () const

virtual void	Delete ()

virtual void	FastDelete ()

void	Print (ostream &os)

virtual void	Register (vtkObjectBase *o)

virtual void	UnRegister (vtkObjectBase *o)

void	SetReferenceCount (int)

void	PrintRevisions (ostream &)

virtual void	PrintHeader (ostream &os, vtkIndent indent)

virtual void	PrintTrailer (ostream &os, vtkIndent indent)

int	GetReferenceCount ()

Static Public Member Functions
static vtkUnstructuredGridBunykRayCastFunction *	New ()

static int	IsTypeOf (const char *type)

static vtkUnstructuredGridBunykRayCastFunction *	SafeDownCast (vtkObjectBase *o)

Static Public Member Functions inherited from vtkUnstructuredGridVolumeRayCastFunction
static int	IsTypeOf (const char *type)

static vtkUnstructuredGridVolumeRayCastFunction *	SafeDownCast (vtkObjectBase *o)

Static Public Member Functions inherited from vtkObject
static int	IsTypeOf (const char *type)

static vtkObject *	SafeDownCast (vtkObjectBase *o)

static vtkObject *	New ()

static void	BreakOnError ()

static void	SetGlobalWarningDisplay (int val)

static void	GlobalWarningDisplayOn ()

static void	GlobalWarningDisplayOff ()

static int	GetGlobalWarningDisplay ()

Static Public Member Functions inherited from vtkObjectBase
static int	IsTypeOf (const char *name)

static vtkObjectBase *	New ()

Protected Member Functions
virtual vtkObjectBase *	NewInstanceInternal () const

	vtkUnstructuredGridBunykRayCastFunction ()

	~vtkUnstructuredGridBunykRayCastFunction ()

int	IsTriangleFrontFacing (Triangle *triPtr, vtkIdType tetraIndex)

void	ClearImage ()

void *	NewIntersection ()

int	CheckValidity (vtkRenderer ren, vtkVolume vol)

void	TransformPoints ()

void	UpdateTriangleList ()

void	ComputeViewDependentInfo ()

void	ComputePixelIntersections ()

Protected Member Functions inherited from vtkUnstructuredGridVolumeRayCastFunction
	vtkUnstructuredGridVolumeRayCastFunction ()

	~vtkUnstructuredGridVolumeRayCastFunction ()

Protected Member Functions inherited from vtkObject
	vtkObject ()

virtual	~vtkObject ()

virtual void	RegisterInternal (vtkObjectBase *, int check)

virtual void	UnRegisterInternal (vtkObjectBase *, int check)

void	InternalGrabFocus (vtkCommand mouseEvents, vtkCommand keypressEvents=NULL)

void	InternalReleaseFocus ()

Protected Member Functions inherited from vtkObjectBase
	vtkObjectBase ()

virtual	~vtkObjectBase ()

virtual void	CollectRevisions (ostream &)

virtual void	ReportReferences (vtkGarbageCollector *)

	vtkObjectBase (const vtkObjectBase &)

void	operator= (const vtkObjectBase &)

Protected Attributes
vtkRenderer *	Renderer

vtkVolume *	Volume

vtkUnstructuredGridVolumeRayCastMapper *	Mapper

int	Valid

int	NumberOfPoints

double *	Points

vtkMatrix4x4 *	ViewToWorldMatrix

Intersection **	Image

int	ImageSize [2]

int	ImageOrigin [2]

int	ImageViewportSize [2]

vtkUnstructuredGridBase *	SavedTriangleListInput

vtkTimeStamp	SavedTriangleListMTime

Triangle **	TetraTriangles

vtkIdType	TetraTrianglesSize

Triangle *	TriangleList

Intersection *	IntersectionBuffer [VTK_BUNYKRCF_MAX_ARRAYS]

int	IntersectionBufferCount [VTK_BUNYKRCF_MAX_ARRAYS]

Protected Attributes inherited from vtkObject
bool	Debug

vtkTimeStamp	MTime

vtkSubjectHelper *	SubjectHelper

Protected Attributes inherited from vtkObjectBase
vtkAtomicInt32	ReferenceCount

vtkWeakPointerBase **	WeakPointers

Detailed Description

a superclass for ray casting functions

vtkUnstructuredGridBunykRayCastFunction is a concrete implementation of a ray cast function for unstructured grid data. This class was based on the paper "Simple, Fast, Robust Ray Casting of Irregular Grids" by Paul Bunyk, Arie Kaufmna, and Claudio Silva. This method is quite memory intensive (with extra explicit copies of the data) and therefore should not be used for very large data. This method assumes that the input data is composed entirely of tetras - use vtkDataSetTriangleFilter before setting the input on the mapper.

The basic idea of this method is as follows:

1) Enumerate the triangles. At each triangle have space for some information that will be used during rendering. This includes which tetra the triangles belong to, the plane equation and the Barycentric coefficients.

2) Keep a reference to all four triangles for each tetra.

3) At the beginning of each render, do the precomputation. This includes creating an array of transformed points (in view coordinates) and computing the view dependent info per triangle (plane equations and barycentric coords in view space)

4) Find all front facing boundary triangles (a triangle is on the boundary if it belongs to only one tetra). For each triangle, find all pixels in the image that intersect the triangle, and add this to the sorted (by depth) intersection list at each pixel.

5) For each ray cast, traverse the intersection list. At each intersection, accumulate opacity and color contribution per tetra along the ray until you reach an exiting triangle (on the boundary).

See also: vtkUnstructuredGridVolumeRayCastMapper

Definition at line 82 of file vtkUnstructuredGridBunykRayCastFunction.h.

Member Typedef Documentation

typedef vtkUnstructuredGridVolumeRayCastFunction vtkUnstructuredGridBunykRayCastFunction::Superclass

Definition at line 86 of file vtkUnstructuredGridBunykRayCastFunction.h.

Constructor & Destructor Documentation

vtkUnstructuredGridBunykRayCastFunction::vtkUnstructuredGridBunykRayCastFunction ( )

protected

vtkUnstructuredGridBunykRayCastFunction::~vtkUnstructuredGridBunykRayCastFunction ( )

protected

Member Function Documentation

static vtkUnstructuredGridBunykRayCastFunction* vtkUnstructuredGridBunykRayCastFunction::New ( )

static

static int vtkUnstructuredGridBunykRayCastFunction::IsTypeOf ( const char * type )

static

virtual int vtkUnstructuredGridBunykRayCastFunction::IsA ( const char * name )

virtual

Return 1 if this class is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkUnstructuredGridVolumeRayCastFunction.

static vtkUnstructuredGridBunykRayCastFunction* vtkUnstructuredGridBunykRayCastFunction::SafeDownCast ( vtkObjectBase * o )

static

virtual vtkObjectBase* vtkUnstructuredGridBunykRayCastFunction::NewInstanceInternal ( ) const

protectedvirtual

Reimplemented from vtkUnstructuredGridVolumeRayCastFunction.

vtkUnstructuredGridBunykRayCastFunction* vtkUnstructuredGridBunykRayCastFunction::NewInstance ( ) const

virtual void vtkUnstructuredGridBunykRayCastFunction::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 vtkUnstructuredGridVolumeRayCastFunction.

virtual void vtkUnstructuredGridBunykRayCastFunction::Initialize	(	vtkRenderer *	ren,
		vtkVolume *	vol
	)

virtual

Called by the ray cast mapper at the start of rendering

Implements vtkUnstructuredGridVolumeRayCastFunction.

virtual void vtkUnstructuredGridBunykRayCastFunction::Finalize ( )

virtual

Called by the ray cast mapper at the end of rendering

Implements vtkUnstructuredGridVolumeRayCastFunction.

virtual vtkUnstructuredGridVolumeRayCastIterator* vtkUnstructuredGridBunykRayCastFunction::NewIterator ( )

virtual

Returns a new object that will iterate over all the intersections of a ray with the cells of the input. The calling code is responsible for deleting the returned object.

Implements vtkUnstructuredGridVolumeRayCastFunction.