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vtkContourGrid Class Reference
generate isosurfaces/isolines from scalar values.
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#include <vtkContourGrid.h>
Inheritance diagram for vtkContourGrid:
[legend]Collaboration diagram for vtkContourGrid:
[legend]List of all members.
Detailed Description
generate isosurfaces/isolines from scalar values.
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Date:
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2000/12/10 20:08:32
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Revision:
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1.5
vtkContourGrid is a filter that takes as input any dataset and generates on output isosurfaces and/or isolines. The exact form of the output depends upon the dimensionality of the input data. Data consisting of 3D cells will generate isosurfaces, data consisting of 2D cells will generate isolines, and data with 1D or 0D cells will generate isopoints. Combinations of output type are possible if the input dimension is mixed.
To use this filter you must specify one or more contour values. You can either use the method SetValue() to specify each contour value, or use GenerateValues() to generate a series of evenly spaced contours. It is also possible to accelerate the operation of this filter (at the cost of extra memory) by using a vtkScalarTree. A scalar tree is used to quickly locate cells that contain a contour surface. This is especially effective if multiple contours are being extracted. If you want to use a scalar tree, invoke the method UseScalarTreeOn().
If the input data is structured, consider using a filter that is optimized for structured data. These can be found in the patented classes of vtk.
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Warning:
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For unstructured data or structured grids, normals and gradients are not computed. Use vtkPolyDataNormals to compute the surface normals.
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See also:
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vtkMarchingContourFilter vtkKitwareContourFilter vtkMarchingCubes vtkSliceCubes vtkDividingCubes vtkMarchingSquares vtkImageMarchingCubes
Definition at line 87 of file vtkContourGrid.h.
Constructor & Destructor Documentation
| vtkContourGrid::vtkContourGrid |
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| vtkContourGrid::~vtkContourGrid |
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| vtkContourGrid::vtkContourGrid |
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const vtkContourGrid & |
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Member Function Documentation
| virtual const char* vtkContourGrid::GetClassName |
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| int vtkContourGrid::IsTypeOf |
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const char * |
type |
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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 vtkTypeMacro found in vtkSetGet.h.
Reimplemented from vtkDataSetToPolyDataFilter. |
| virtual int vtkContourGrid::IsA |
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const char * |
type |
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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 vtkTypeMacro found in vtkSetGet.h.
Reimplemented from vtkDataSetToPolyDataFilter. |
| vtkContourGrid* vtkContourGrid::SafeDownCast |
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vtkObject * |
o |
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| void vtkContourGrid::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 vtkSource. |
| vtkContourGrid* vtkContourGrid::New |
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Construct object with initial range (0,1) and single contour value of 0.0.
Reimplemented from vtkPolyDataSource. |
| void vtkContourGrid::SetValue |
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int |
i, |
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float |
value |
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| float vtkContourGrid::GetValue |
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int |
i |
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| float * vtkContourGrid::GetValues |
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| void vtkContourGrid::GetValues |
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float * |
contourValues |
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Fill a supplied list with contour values. There will be GetNumberOfContours() values in the list. Make sure you allocate enough memory to hold the list.
Definition at line 189 of file vtkContourGrid.h. |
| void vtkContourGrid::SetNumberOfContours |
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int |
number |
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[inline] |
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Set the number of contours to place into the list. You only really need to use this method to reduce list size. The method SetValue() will automatically increase list size as needed.
Definition at line 195 of file vtkContourGrid.h. |
| int vtkContourGrid::GetNumberOfContours |
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Get the number of contours in the list of contour values.
Definition at line 199 of file vtkContourGrid.h. |
| void vtkContourGrid::GenerateValues |
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int |
numContours, |
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float |
range[2] |
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[inline] |
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Generate numContours equally spaced contour values between specified range. Contour values will include min/max range values.
Definition at line 204 of file vtkContourGrid.h. |
| void vtkContourGrid::GenerateValues |
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int |
numContours, |
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float |
rangeStart, |
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float |
rangeEnd |
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Generate numContours equally spaced contour values between specified range. Contour values will include min/max range values.
Definition at line 209 of file vtkContourGrid.h. |
| unsigned long vtkContourGrid::GetMTime |
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| virtual void vtkContourGrid::SetComputeNormals |
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int |
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Set/Get the computation of normals. Normal computation is fairly expensive in both time and storage. If the output data will be processed by filters that modify topology or geometry, it may be wise to turn Normals and Gradients off. |
| virtual int vtkContourGrid::GetComputeNormals |
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| virtual void vtkContourGrid::ComputeNormalsOn |
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| virtual void vtkContourGrid::ComputeNormalsOff |
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| virtual void vtkContourGrid::SetComputeGradients |
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int |
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Set/Get the computation of gradients. Gradient computation is fairly expensive in both time and storage. Note that if ComputeNormals is on, gradients will have to be calculated, but will not be stored in the output dataset. If the output data will be processed by filters that modify topology or geometry, it may be wise to turn Normals and Gradients off. |
| virtual int vtkContourGrid::GetComputeGradients |
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| virtual void vtkContourGrid::ComputeGradientsOn |
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| virtual void vtkContourGrid::ComputeGradientsOff |
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| virtual void vtkContourGrid::SetComputeScalars |
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int |
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Set/Get the computation of scalars. |
| virtual int vtkContourGrid::GetComputeScalars |
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| virtual void vtkContourGrid::ComputeScalarsOn |
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| virtual void vtkContourGrid::ComputeScalarsOff |
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| virtual void vtkContourGrid::SetUseScalarTree |
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int |
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Enable the use of a scalar tree to accelerate contour extraction. |
| virtual int vtkContourGrid::GetUseScalarTree |
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| virtual void vtkContourGrid::UseScalarTreeOn |
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| virtual void vtkContourGrid::UseScalarTreeOff |
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Set / get a spatial locator for merging points. By default, an instance of vtkMergePoints is used. |
| void vtkContourGrid::CreateDefaultLocator |
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void |
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Create default locator. Used to create one when none is specified. The locator is used to merge coincident points. |
| void vtkContourGrid::operator= |
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const vtkContourGrid & |
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[inline, protected] |
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| void vtkContourGrid::Execute |
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[protected, virtual] |
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Member Data Documentation
int vtkContourGrid::ComputeNormals [protected]
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int vtkContourGrid::ComputeGradients [protected]
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int vtkContourGrid::ComputeScalars [protected]
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int vtkContourGrid::UseScalarTree [protected]
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The documentation for this class was generated from the following file:
Generated on Wed Nov 21 12:47:03 2001 for VTK by
1.2.11.1 written by Dimitri van Heesch,
© 1997-2001