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vtkMarchingContourFilter Class Reference
generate isosurfaces/isolines from scalar values.
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#include <vtkMarchingContourFilter.h>
Inheritance diagram for vtkMarchingContourFilter:
[legend]Collaboration diagram for vtkMarchingContourFilter:
[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 20:09:16
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Revision:
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1.10
vtkMarchingContourFilter 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.
This filter will identify special dataset types (e.g., structured points) and use the appropriate specialized filter to process the data. For examples, if the input dataset type is a volume, this filter will create an internal vtkMarchingCubes instance and use it. This gives much better performance.
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().
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Warning:
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For unstructured data or structured grids, normals and gradients are not computed. This calculation will be implemented in the future. In the mean time, use vtkPolyDataNormals to compute the surface normals.
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See also:
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vtkMarchingCubes vtkSliceCubes vtkDividingCubes vtkMarchingSquares vtkImageMarchingCubes
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Examples:
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vtkMarchingContourFilter (examples)
Definition at line 105 of file vtkMarchingContourFilter.h.
Constructor & Destructor Documentation
| vtkMarchingContourFilter::vtkMarchingContourFilter |
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| vtkMarchingContourFilter::~vtkMarchingContourFilter |
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| vtkMarchingContourFilter::vtkMarchingContourFilter |
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const vtkMarchingContourFilter & |
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Member Function Documentation
| virtual const char* vtkMarchingContourFilter::GetClassName |
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| int vtkMarchingContourFilter::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 vtkMarchingContourFilter::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. |
| vtkMarchingContourFilter* vtkMarchingContourFilter::SafeDownCast |
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vtkObject * |
o |
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| void vtkMarchingContourFilter::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. |
| vtkMarchingContourFilter* vtkMarchingContourFilter::New |
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[static] |
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Construct object with initial range (0,1) and single contour value of 0.0.
Reimplemented from vtkPolyDataSource. |
| void vtkMarchingContourFilter::SetValue |
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int |
i, |
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float |
value |
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[inline] |
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| float vtkMarchingContourFilter::GetValue |
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int |
i |
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| float * vtkMarchingContourFilter::GetValues |
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[inline] |
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| void vtkMarchingContourFilter::GetValues |
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float * |
contourValues |
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| void vtkMarchingContourFilter::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 218 of file vtkMarchingContourFilter.h. |
| int vtkMarchingContourFilter::GetNumberOfContours |
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| void vtkMarchingContourFilter::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 227 of file vtkMarchingContourFilter.h. |
| void vtkMarchingContourFilter::GenerateValues |
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int |
numContours, |
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float |
rangeStart, |
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float |
rangeEnd |
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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 232 of file vtkMarchingContourFilter.h. |
| unsigned long vtkMarchingContourFilter::GetMTime |
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| virtual void vtkMarchingContourFilter::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 vtkMarchingContourFilter::GetComputeNormals |
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| virtual void vtkMarchingContourFilter::ComputeNormalsOn |
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| virtual void vtkMarchingContourFilter::ComputeNormalsOff |
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| virtual void vtkMarchingContourFilter::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 vtkMarchingContourFilter::GetComputeGradients |
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| virtual void vtkMarchingContourFilter::ComputeGradientsOn |
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| virtual void vtkMarchingContourFilter::ComputeGradientsOff |
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| virtual void vtkMarchingContourFilter::SetComputeScalars |
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int |
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Set/Get the computation of scalars. |
| virtual int vtkMarchingContourFilter::GetComputeScalars |
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| virtual void vtkMarchingContourFilter::ComputeScalarsOn |
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| virtual void vtkMarchingContourFilter::ComputeScalarsOff |
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| virtual void vtkMarchingContourFilter::SetUseScalarTree |
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int |
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Enable the use of a scalar tree to accelerate contour extraction. |
| virtual int vtkMarchingContourFilter::GetUseScalarTree |
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| virtual void vtkMarchingContourFilter::UseScalarTreeOn |
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| virtual void vtkMarchingContourFilter::UseScalarTreeOff |
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Set / get a spatial locator for merging points. By default, an instance of vtkMergePoints is used. |
| virtual vtkPointLocator* vtkMarchingContourFilter::GetLocator |
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| void vtkMarchingContourFilter::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 vtkMarchingContourFilter::SetLocator |
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vtkPointLocator & |
locator |
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[inline] |
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| void vtkMarchingContourFilter::operator= |
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const vtkMarchingContourFilter & |
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[inline, protected] |
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| void vtkMarchingContourFilter::Execute |
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| void vtkMarchingContourFilter::StructuredPointsContour |
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int |
dim |
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| void vtkMarchingContourFilter::ImageContour |
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int |
dim |
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| void vtkMarchingContourFilter::DataSetContour |
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Member Data Documentation
int vtkMarchingContourFilter::ComputeNormals [protected]
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int vtkMarchingContourFilter::ComputeGradients [protected]
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int vtkMarchingContourFilter::ComputeScalars [protected]
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int vtkMarchingContourFilter::UseScalarTree [protected]
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The documentation for this class was generated from the following file:
Generated on Wed Nov 21 12:52:53 2001 for VTK by
1.2.11.1 written by Dimitri van Heesch,
© 1997-2001