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vtkUnstructuredGridBunykRayCastFunction Class Reference

#include <vtkUnstructuredGridBunykRayCastFunction.h>

Inheritance diagram for vtkUnstructuredGridBunykRayCastFunction:

Inheritance graph
Collaboration diagram for vtkUnstructuredGridBunykRayCastFunction:

Collaboration graph
List of all members.

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:

Definition at line 81 of file vtkUnstructuredGridBunykRayCastFunction.h.

Public Types

typedef vtkUnstructuredGridVolumeRayCastFunction 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 ()
Triangle ** GetTetraTriangles ()
IntersectionGetIntersectionList (int x, int y)
virtual vtkUnstructuredGridVolumeRayCastIteratorNewIterator ()
int InTriangle (double x, double y, Triangle *triPtr)
double * GetPoints ()
virtual vtkMatrix4x4GetViewToWorldMatrix ()
virtual int * GetImageOrigin ()
virtual void GetImageOrigin (int data[2])
virtual int * GetImageViewportSize ()
virtual void GetImageViewportSize (int data[2])

Static Public Member Functions

static vtkUnstructuredGridBunykRayCastFunctionNew ()
static int IsTypeOf (const char *type)
static vtkUnstructuredGridBunykRayCastFunctionSafeDownCast (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 Attributes

int Valid
int NumberOfPoints
double * Points
Intersection ** Image
int ImageSize [2]
int ImageOrigin [2]
int ImageViewportSize [2]
vtkTimeStamp SavedTriangleListMTime
Triangle ** TetraTriangles
IntersectionIntersectionBuffer [VTK_BUNYKRCF_MAX_ARRAYS]
int IntersectionBufferCount [VTK_BUNYKRCF_MAX_ARRAYS]


class  Intersection
class  Triangle

Member Typedef Documentation

typedef vtkUnstructuredGridVolumeRayCastFunction vtkUnstructuredGridBunykRayCastFunction::Superclass

Reimplemented from vtkUnstructuredGridVolumeRayCastFunction.

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]

Reimplemented from vtkUnstructuredGridVolumeRayCastFunction.

static int vtkUnstructuredGridBunykRayCastFunction::IsTypeOf const char *  type  )  [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 vtkTypeRevisionMacro found in vtkSetGet.h.

Reimplemented from vtkUnstructuredGridVolumeRayCastFunction.

virtual int vtkUnstructuredGridBunykRayCastFunction::IsA const char *  type  )  [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 vtkTypeRevisionMacro found in vtkSetGet.h.

Reimplemented from vtkUnstructuredGridVolumeRayCastFunction.

static vtkUnstructuredGridBunykRayCastFunction* vtkUnstructuredGridBunykRayCastFunction::SafeDownCast vtkObject o  )  [static]

Reimplemented from vtkUnstructuredGridVolumeRayCastFunction.

virtual void vtkUnstructuredGridBunykRayCastFunction::PrintSelf ostream &  os,
vtkIndent  indent

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

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

Access to an internal structure for the templated method.

Definition at line 149 of file vtkUnstructuredGridBunykRayCastFunction.h.

int vtkUnstructuredGridBunykRayCastFunction::IsTriangleFrontFacing Triangle triPtr,
vtkIdType  tetraIndex

void vtkUnstructuredGridBunykRayCastFunction::ClearImage  )  [protected]

void* vtkUnstructuredGridBunykRayCastFunction::NewIntersection  )  [protected]

int vtkUnstructuredGridBunykRayCastFunction::CheckValidity vtkRenderer ren,
vtkVolume vol

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.

Triangle* vtkUnstructuredGridBunykRayCastFunction::TriangleList [protected]

Definition at line 207 of file vtkUnstructuredGridBunykRayCastFunction.h.

Intersection* vtkUnstructuredGridBunykRayCastFunction::IntersectionBuffer[VTK_BUNYKRCF_MAX_ARRAYS] [protected]

Definition at line 223 of file vtkUnstructuredGridBunykRayCastFunction.h.

int vtkUnstructuredGridBunykRayCastFunction::IntersectionBufferCount[VTK_BUNYKRCF_MAX_ARRAYS] [protected]

Definition at line 224 of file vtkUnstructuredGridBunykRayCastFunction.h.

The documentation for this class was generated from the following file:
Generated on Tue Jan 22 00:26:32 2008 for VTK by  doxygen 1.4.3-20050530