vtkFiniteDifferenceGradientEstimator Class Reference
#include <vtkFiniteDifferenceGradientEstimator.h>
Inheritance diagram for vtkFiniteDifferenceGradientEstimator:
Detailed Description
Use finite differences to estimate gradient.
- Date:
- 2002/08/22 18:39:30
- Revision:
- 1.19
vtkFiniteDifferenceGradientEstimator is a concrete subclass of vtkEncodedGradientEstimator that uses a central differences technique to estimate the gradient. The gradient at some sample location (x,y,z) would be estimated by:
nx = (f(x-dx,y,z) - f(x+dx,y,z)) / 2*dx; ny = (f(x,y-dy,z) - f(x,y+dy,z)) / 2*dy; nz = (f(x,y,z-dz) - f(x,y,z+dz)) / 2*dz;
This value is normalized to determine a unit direction vector and a magnitude. The normal is computed in voxel space, and dx = dy = dz = SampleSpacingInVoxels. A scaling factor is applied to convert this normal from voxel space to world coordinates.
- See also:
- vtkEncodedGradientEstimator
- Created by:
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- Avila, Lisa
- CVS contributions (if > 5%):
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- Avila, Lisa (71%)
- Martin, Ken (7%)
- Lorensen, Bill (6%)
- CVS logs (CVSweb):
Definition at line 62 of file vtkFiniteDifferenceGradientEstimator.h.
Public Types | |
| typedef vtkEncodedGradientEstimator | Superclass |
Public Methods | |
| virtual const char * | GetClassName () |
| virtual int | IsA (const char *type) |
| void | PrintSelf (ostream &os, vtkIndent indent) |
| virtual void | SetSampleSpacingInVoxels (int) |
| virtual int | GetSampleSpacingInVoxels () |
Static Public Methods | |
| int | IsTypeOf (const char *type) |
| vtkFiniteDifferenceGradientEstimator * | SafeDownCast (vtkObject *o) |
| vtkFiniteDifferenceGradientEstimator * | New () |
Public Attributes | |
| int | SampleSpacingInVoxels |
Protected Methods | |
| vtkFiniteDifferenceGradientEstimator () | |
| ~vtkFiniteDifferenceGradientEstimator () | |
| void | UpdateNormals (void) |
Member Typedef Documentation
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Reimplemented from vtkEncodedGradientEstimator. Definition at line 65 of file vtkFiniteDifferenceGradientEstimator.h. |
Constructor & Destructor Documentation
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Member Function Documentation
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Reimplemented from vtkEncodedGradientEstimator. |
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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 vtkEncodedGradientEstimator. |
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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 vtkEncodedGradientEstimator. |
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Reimplemented from vtkEncodedGradientEstimator. |
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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 vtkEncodedGradientEstimator. |
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Construct a vtkFiniteDifferenceGradientEstimator with a SampleSpacingInVoxels of 1. Reimplemented from vtkObject. |
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Set/Get the spacing between samples for the finite differences method used to compute the normal. This spacing is in voxel units. |
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Set/Get the spacing between samples for the finite differences method used to compute the normal. This spacing is in voxel units. |
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Recompute the encoded normals and gradient magnitudes. Implements vtkEncodedGradientEstimator. |
Member Data Documentation
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Definition at line 80 of file vtkFiniteDifferenceGradientEstimator.h. |
The documentation for this class was generated from the following file:
- Rendering/vtkFiniteDifferenceGradientEstimator.h