vtkUnstructuredGridBunykRayCastFunction Class Reference
#include <vtkUnstructuredGridBunykRayCastFunction.h>
Inheritance diagram for vtkUnstructuredGridBunykRayCastFunction:
[legend]Collaboration diagram for vtkUnstructuredGridBunykRayCastFunction:
[legend]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:
- vtkUnstructuredGridVolumeRayCastMapper
Definition at line 81 of file vtkUnstructuredGridBunykRayCastFunction.h.
Member Typedef Documentation
Constructor & Destructor Documentation
| vtkUnstructuredGridBunykRayCastFunction::vtkUnstructuredGridBunykRayCastFunction |
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| vtkUnstructuredGridBunykRayCastFunction::~vtkUnstructuredGridBunykRayCastFunction |
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Member Function Documentation
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Create an object with Debug turned off, modified time initialized to zero, and reference counting on.
Reimplemented from vtkObject. |
| virtual const char* vtkUnstructuredGridBunykRayCastFunction::GetClassName |
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| static int vtkUnstructuredGridBunykRayCastFunction::IsTypeOf |
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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 |
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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. |
| virtual void vtkUnstructuredGridBunykRayCastFunction::PrintSelf |
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ostream & |
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vtkIndent |
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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 |
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vtkRenderer * |
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vtkVolume * |
vol |
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| virtual void vtkUnstructuredGridBunykRayCastFunction::Finalize |
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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 |
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double |
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double |
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Triangle * |
triPtr |
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Is the point x, y, in the given triangle? Public for access from the templated function. |
| double* vtkUnstructuredGridBunykRayCastFunction::GetPoints |
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| virtual vtkMatrix4x4* vtkUnstructuredGridBunykRayCastFunction::GetViewToWorldMatrix |
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Access to an internal structure for the templated method. |
| virtual int* vtkUnstructuredGridBunykRayCastFunction::GetImageOrigin |
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Access to an internal structure for the templated method. |
| virtual void vtkUnstructuredGridBunykRayCastFunction::GetImageOrigin |
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int |
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Access to an internal structure for the templated method. |
| virtual int* vtkUnstructuredGridBunykRayCastFunction::GetImageViewportSize |
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Access to an internal structure for the templated method. |
| virtual void vtkUnstructuredGridBunykRayCastFunction::GetImageViewportSize |
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int |
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Access to an internal structure for the templated method. |
| Triangle** vtkUnstructuredGridBunykRayCastFunction::GetTetraTriangles |
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| Intersection* vtkUnstructuredGridBunykRayCastFunction::GetIntersectionList |
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| int vtkUnstructuredGridBunykRayCastFunction::IsTriangleFrontFacing |
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Triangle * |
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vtkIdType |
tetraIndex |
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| void vtkUnstructuredGridBunykRayCastFunction::ClearImage |
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| void* vtkUnstructuredGridBunykRayCastFunction::NewIntersection |
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| int vtkUnstructuredGridBunykRayCastFunction::CheckValidity |
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vtkVolume * |
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| void vtkUnstructuredGridBunykRayCastFunction::TransformPoints |
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| void vtkUnstructuredGridBunykRayCastFunction::UpdateTriangleList |
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| void vtkUnstructuredGridBunykRayCastFunction::ComputeViewDependentInfo |
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| void vtkUnstructuredGridBunykRayCastFunction::ComputePixelIntersections |
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Member Data Documentation
The documentation for this class was generated from the following file:
Generated on Tue Jan 22 00:26:32 2008 for VTK by
1.4.3-20050530