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vtkUnstructuredGridBunykRayCastFunction Class Reference

a superclass for ray casting functions More...

#include <vtkUnstructuredGridBunykRayCastFunction.h>

Inheritance diagram for vtkUnstructuredGridBunykRayCastFunction:
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Collaboration diagram for vtkUnstructuredGridBunykRayCastFunction:
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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 const char * GetClassName ()
virtual int IsA (const char *type)
virtual void PrintSelf (ostream &os, vtkIndent indent)
virtual void Initialize (vtkRenderer *ren, vtkVolume *vol)
virtual void Finalize ()
virtual
vtkUnstructuredGridVolumeRayCastIterator
NewIterator ()
double * GetPoints ()
Triangle ** GetTetraTriangles ()
IntersectionGetIntersectionList (int x, int y)
int InTriangle (double x, double y, Triangle *triPtr)
virtual vtkMatrix4x4GetViewToWorldMatrix ()
virtual int * GetImageOrigin ()
virtual void GetImageOrigin (int data[2])
virtual int * GetImageViewportSize ()
virtual void GetImageViewportSize (int data[2])
- Public Member Functions inherited from vtkObject
virtual void DebugOn ()
virtual void DebugOff ()
unsigned char GetDebug ()
void SetDebug (unsigned char 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)
vtkCommandGetCommand (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)
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 &os)
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 (vtkObject *o)

Protected Member Functions

 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 &os)
virtual void ReportReferences (vtkGarbageCollector *)
 vtkObjectBase (const vtkObjectBase &)
void operator= (const vtkObjectBase &)

Protected Attributes

vtkRendererRenderer
vtkVolumeVolume
vtkUnstructuredGridVolumeRayCastMapperMapper
int Valid
int NumberOfPoints
double * Points
vtkMatrix4x4ViewToWorldMatrix
Intersection ** Image
int ImageSize [2]
int ImageOrigin [2]
int ImageViewportSize [2]
vtkUnstructuredGridSavedTriangleListInput
vtkTimeStamp SavedTriangleListMTime
Triangle ** TetraTriangles
vtkIdType TetraTrianglesSize
TriangleTriangleList
IntersectionIntersectionBuffer [VTK_BUNYKRCF_MAX_ARRAYS]
int IntersectionBufferCount [VTK_BUNYKRCF_MAX_ARRAYS]

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 81 of file vtkUnstructuredGridBunykRayCastFunction.h.

Member Typedef Documentation

Definition at line 85 of file vtkUnstructuredGridBunykRayCastFunction.h.

Constructor & Destructor Documentation

vtkUnstructuredGridBunykRayCastFunction::vtkUnstructuredGridBunykRayCastFunction ( )
protected
vtkUnstructuredGridBunykRayCastFunction::~vtkUnstructuredGridBunykRayCastFunction ( )
protected

Member Function Documentation

static vtkUnstructuredGridBunykRayCastFunction* vtkUnstructuredGridBunykRayCastFunction::New ( )
static

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

Reimplemented from vtkObject.

virtual const char* vtkUnstructuredGridBunykRayCastFunction::GetClassName ( )
virtual
static int vtkUnstructuredGridBunykRayCastFunction::IsTypeOf ( const char *  name)
static

Return 1 if this class type 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.

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 ( vtkObject o)
static
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.

int vtkUnstructuredGridBunykRayCastFunction::InTriangle ( double  x,
double  y,
Triangle triPtr 
)

Is the point x, y, in the given triangle? Public for access from the templated function.

double* vtkUnstructuredGridBunykRayCastFunction::GetPoints ( )
inline

Access to an internal structure for the templated method.

Definition at line 128 of file vtkUnstructuredGridBunykRayCastFunction.h.

virtual vtkMatrix4x4* vtkUnstructuredGridBunykRayCastFunction::GetViewToWorldMatrix ( )
virtual

Access to an internal structure for the templated method.

virtual int* vtkUnstructuredGridBunykRayCastFunction::GetImageOrigin ( )
virtual

Access to an internal structure for the templated method.

virtual void vtkUnstructuredGridBunykRayCastFunction::GetImageOrigin ( int  data[2])
virtual

Access to an internal structure for the templated method.

virtual int* vtkUnstructuredGridBunykRayCastFunction::GetImageViewportSize ( )
virtual

Access to an internal structure for the templated method.

virtual void vtkUnstructuredGridBunykRayCastFunction::GetImageViewportSize ( int  data[2])
virtual

Access to an internal structure for the templated method.

Triangle** vtkUnstructuredGridBunykRayCastFunction::GetTetraTriangles ( )
inline

Access to an internal structure for the templated method.

Definition at line 146 of file vtkUnstructuredGridBunykRayCastFunction.h.

Intersection* vtkUnstructuredGridBunykRayCastFunction::GetIntersectionList ( int  x,
int  y 
)
inline

Access to an internal structure for the templated method.

Definition at line 149 of file vtkUnstructuredGridBunykRayCastFunction.h.

int vtkUnstructuredGridBunykRayCastFunction::IsTriangleFrontFacing ( Triangle triPtr,
vtkIdType  tetraIndex 
)
protected
void vtkUnstructuredGridBunykRayCastFunction::ClearImage ( )
protected
void* vtkUnstructuredGridBunykRayCastFunction::NewIntersection ( )
protected
int vtkUnstructuredGridBunykRayCastFunction::CheckValidity ( vtkRenderer ren,
vtkVolume vol 
)
protected
void vtkUnstructuredGridBunykRayCastFunction::TransformPoints ( )
protected
void vtkUnstructuredGridBunykRayCastFunction::UpdateTriangleList ( )
protected
void vtkUnstructuredGridBunykRayCastFunction::ComputeViewDependentInfo ( )
protected
void vtkUnstructuredGridBunykRayCastFunction::ComputePixelIntersections ( )
protected

Member Data Documentation

vtkRenderer* vtkUnstructuredGridBunykRayCastFunction::Renderer
protected

Definition at line 159 of file vtkUnstructuredGridBunykRayCastFunction.h.

vtkVolume* vtkUnstructuredGridBunykRayCastFunction::Volume
protected

Definition at line 160 of file vtkUnstructuredGridBunykRayCastFunction.h.

vtkUnstructuredGridVolumeRayCastMapper* vtkUnstructuredGridBunykRayCastFunction::Mapper
protected

Definition at line 161 of file vtkUnstructuredGridBunykRayCastFunction.h.

int vtkUnstructuredGridBunykRayCastFunction::Valid
protected

Definition at line 166 of file vtkUnstructuredGridBunykRayCastFunction.h.

int vtkUnstructuredGridBunykRayCastFunction::NumberOfPoints
protected

Definition at line 169 of file vtkUnstructuredGridBunykRayCastFunction.h.

double* vtkUnstructuredGridBunykRayCastFunction::Points
protected

Definition at line 170 of file vtkUnstructuredGridBunykRayCastFunction.h.

vtkMatrix4x4* vtkUnstructuredGridBunykRayCastFunction::ViewToWorldMatrix
protected

Definition at line 174 of file vtkUnstructuredGridBunykRayCastFunction.h.

Intersection** vtkUnstructuredGridBunykRayCastFunction::Image
protected

Definition at line 178 of file vtkUnstructuredGridBunykRayCastFunction.h.

int vtkUnstructuredGridBunykRayCastFunction::ImageSize[2]
protected

Definition at line 182 of file vtkUnstructuredGridBunykRayCastFunction.h.

int vtkUnstructuredGridBunykRayCastFunction::ImageOrigin[2]
protected

Definition at line 189 of file vtkUnstructuredGridBunykRayCastFunction.h.

int vtkUnstructuredGridBunykRayCastFunction::ImageViewportSize[2]
protected

Definition at line 192 of file vtkUnstructuredGridBunykRayCastFunction.h.

vtkUnstructuredGrid* vtkUnstructuredGridBunykRayCastFunction::SavedTriangleListInput
protected

Definition at line 196 of file vtkUnstructuredGridBunykRayCastFunction.h.

vtkTimeStamp vtkUnstructuredGridBunykRayCastFunction::SavedTriangleListMTime
protected

Definition at line 197 of file vtkUnstructuredGridBunykRayCastFunction.h.

Triangle** vtkUnstructuredGridBunykRayCastFunction::TetraTriangles
protected

Definition at line 206 of file vtkUnstructuredGridBunykRayCastFunction.h.

vtkIdType vtkUnstructuredGridBunykRayCastFunction::TetraTrianglesSize
protected

Definition at line 207 of file vtkUnstructuredGridBunykRayCastFunction.h.

Triangle* vtkUnstructuredGridBunykRayCastFunction::TriangleList
protected

Definition at line 209 of file vtkUnstructuredGridBunykRayCastFunction.h.

Intersection* vtkUnstructuredGridBunykRayCastFunction::IntersectionBuffer[VTK_BUNYKRCF_MAX_ARRAYS]
protected

Definition at line 225 of file vtkUnstructuredGridBunykRayCastFunction.h.

int vtkUnstructuredGridBunykRayCastFunction::IntersectionBufferCount[VTK_BUNYKRCF_MAX_ARRAYS]
protected

Definition at line 226 of file vtkUnstructuredGridBunykRayCastFunction.h.


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