vtkPlanesIntersection Class Reference
#include <vtkPlanesIntersection.h>
Inheritance diagram for vtkPlanesIntersection:
[legend]Collaboration diagram for vtkPlanesIntersection:
[legend]List of all members.
Detailed Description
Computes whether the convex region defined by (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 a view frustum created by a rectangular portion of the view plane. 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.
- Created by:
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- CVS contributions (if > 5%):
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- CVS logs (CVSweb):
/Parallel/vtkPlanesIntersection.cxx)/Parallel/vtkPlanesIntersection.h)
Definition at line 61 of file vtkPlanesIntersection.h.
Constructor & Destructor Documentation
| vtkPlanesIntersection::vtkPlanesIntersection |
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Member Function Documentation
| void vtkPlanesIntersection::PrintSelf |
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ostream & |
os, |
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vtkIndent |
indent |
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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 vtkPlanes. |
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Create an object with Debug turned off, modified time initialized to zero, and reference counting on.
Reimplemented from vtkPlanes. |
| void vtkPlanesIntersection::SetRegionVertices |
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vtkPoints * |
pts |
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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 |
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double * |
v, |
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int |
nvertices |
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| int vtkPlanesIntersection::GetNumRegionVertices |
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| int vtkPlanesIntersection::GetRegionVertices |
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double * |
v, |
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int |
nvertices |
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| int vtkPlanesIntersection::IntersectsRegion |
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vtkPoints * |
R |
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Return 1 if the axis aligned box defined by R intersects the region defined by the planes, or 0 otherwise. |
| int vtkPlanesIntersection::PolygonIntersectsBBox |
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double |
bounds[6], |
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vtkPoints * |
pts |
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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. |
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Another convenience function provided by this class, it returns the vtkPlanesIntersection object representing the view frustum created by projecting a sub-rectangle of the view plane. Sub-rectangle range is [-1,1],[-1,1]. If you want the entire view plane, you can instead use vtkCamera::GetFrustumPlanes() to get the planes, then create a vtkPlanesIntersection object and use vtkPlanes::SetFrustumPlanes() to set the planes. |
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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. |
The documentation for this class was generated from the following file: