vtkSimpleScalarTree Class Reference
#include <vtkSimpleScalarTree.h>
Inheritance diagram for vtkSimpleScalarTree:
[legend]Collaboration diagram for vtkSimpleScalarTree:
[legend]List of all members.
Detailed Description
organize data according to scalar values (used to accelerate contouring operations)
vtkSimpleScalarTree creates a pointerless binary tree that helps search for cells that lie within a particular scalar range. This object is used to accelerate some contouring (and other scalar-based techniques).
The tree consists of an array of (min,max) scalar range pairs per node in the tree. The (min,max) range is determined from looking at the range of the children of the tree node. If the node is a leaf, then the range is determined by scanning the range of scalar data in n cells in the dataset. The n cells are determined by arbitrary selecting cell ids from id(i) to id(i+n), and where n is specified using the BranchingFactor ivar. Note that leaf node i=0 contains the scalar range computed from cell ids (0,n-1); leaf node i=1 contains the range from cell ids (n,2n-1); and so on. The implication is that there are no direct lists of cell ids per leaf node, instead the cell ids are implicitly known.
Definition at line 43 of file vtkSimpleScalarTree.h.
Member Typedef Documentation
Constructor & Destructor Documentation
| vtkSimpleScalarTree::vtkSimpleScalarTree |
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| vtkSimpleScalarTree::~vtkSimpleScalarTree |
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Member Function Documentation
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Instantiate scalar tree with maximum level of 20 and branching factor of 5.
Reimplemented from vtkObject. |
| virtual const char* vtkSimpleScalarTree::GetClassName |
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| static int vtkSimpleScalarTree::IsTypeOf |
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| virtual int vtkSimpleScalarTree::IsA |
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| void vtkSimpleScalarTree::PrintSelf |
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ostream & |
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vtkIndent |
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| virtual void vtkSimpleScalarTree::SetBranchingFactor |
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Set the branching factor for the tree. This is the number of children per tree node. Smaller values (minimum is 2) mean deeper trees and more memory overhead. Larger values mean shallower trees, less memory usage, but worse performance. |
| virtual int vtkSimpleScalarTree::GetBranchingFactor |
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Set the branching factor for the tree. This is the number of children per tree node. Smaller values (minimum is 2) mean deeper trees and more memory overhead. Larger values mean shallower trees, less memory usage, but worse performance. |
| virtual int vtkSimpleScalarTree::GetLevel |
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Get the level of the scalar tree. This value may change each time the scalar tree is built and the branching factor changes. |
| virtual void vtkSimpleScalarTree::SetMaxLevel |
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Set the maximum allowable level for the tree. |
| virtual int vtkSimpleScalarTree::GetMaxLevel |
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Set the maximum allowable level for the tree. |
| virtual void vtkSimpleScalarTree::BuildTree |
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Construct the scalar tree from the dataset provided. Checks build times and modified time from input and reconstructs the tree if necessary.
Implements vtkScalarTree. |
| virtual void vtkSimpleScalarTree::Initialize |
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Initialize locator. Frees memory and resets object as appropriate.
Implements vtkScalarTree. |
| virtual void vtkSimpleScalarTree::InitTraversal |
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double |
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Begin to traverse the cells based on a scalar value. Returned cells will have scalar values that span the scalar value specified.
Implements vtkScalarTree. |
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Return the next cell that may contain scalar value specified to initialize traversal. The value NULL is returned if the list is exhausted. Make sure that InitTraversal() has been invoked first or you'll get erratic behavior.
Implements vtkScalarTree. |
Member Data Documentation
The documentation for this class was generated from the following file:
Generated on Tue Jan 22 00:16:51 2008 for VTK by
1.4.3-20050530