vtkContourFilter Class Reference

#include <vtkContourFilter.h>

Inheritance diagram for vtkContourFilter:

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List of all members.


Detailed Description

generate isosurfaces/isolines from scalar values

vtkContourFilter 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().

Warning:
For unstructured data or structured grids, normals and gradients are not computed. Use vtkPolyDataNormals to compute the surface normals.
See also:
vtkMarchingContourFilter vtkMarchingCubes vtkSliceCubes vtkMarchingSquares vtkImageMarchingCubes
Examples:
vtkContourFilter (Examples)
Tests:
vtkContourFilter (Tests)

Definition at line 66 of file vtkContourFilter.h.


Public Types

typedef vtkPolyDataAlgorithm Superclass

Public Member Functions

virtual const char * GetClassName ()
virtual int IsA (const char *type)
void PrintSelf (ostream &os, vtkIndent indent)
unsigned long GetMTime ()
void CreateDefaultLocator ()
void SetValue (int i, double value)
double GetValue (int i)
double * GetValues ()
void GetValues (double *contourValues)
void SetNumberOfContours (int number)
int GetNumberOfContours ()
void GenerateValues (int numContours, double range[2])
void GenerateValues (int numContours, double rangeStart, double rangeEnd)
virtual void SetComputeNormals (int)
virtual int GetComputeNormals ()
virtual void ComputeNormalsOn ()
virtual void ComputeNormalsOff ()
virtual void SetComputeGradients (int)
virtual int GetComputeGradients ()
virtual void ComputeGradientsOn ()
virtual void ComputeGradientsOff ()
virtual void SetComputeScalars (int)
virtual int GetComputeScalars ()
virtual void ComputeScalarsOn ()
virtual void ComputeScalarsOff ()
virtual void SetUseScalarTree (int)
virtual int GetUseScalarTree ()
virtual void UseScalarTreeOn ()
virtual void UseScalarTreeOff ()
virtual void SetScalarTree (vtkScalarTree *)
virtual vtkScalarTreeGetScalarTree ()
void SetLocator (vtkIncrementalPointLocator *locator)
virtual
vtkIncrementalPointLocator
GetLocator ()
void SetArrayComponent (int)
int GetArrayComponent ()
virtual int ProcessRequest (vtkInformation *, vtkInformationVector **, vtkInformationVector *)

Static Public Member Functions

static int IsTypeOf (const char *type)
static vtkContourFilterSafeDownCast (vtkObject *o)
static vtkContourFilterNew ()

Protected Member Functions

 vtkContourFilter ()
 ~vtkContourFilter ()
virtual void ReportReferences (vtkGarbageCollector *)
virtual int RequestData (vtkInformation *request, vtkInformationVector **inputVector, vtkInformationVector *outputVector)
virtual int RequestUpdateExtent (vtkInformation *, vtkInformationVector **, vtkInformationVector *)
virtual int FillInputPortInformation (int port, vtkInformation *info)

Protected Attributes

vtkContourValuesContourValues
int ComputeNormals
int ComputeGradients
int ComputeScalars
vtkIncrementalPointLocatorLocator
int UseScalarTree
vtkScalarTreeScalarTree
vtkSynchronizedTemplates2DSynchronizedTemplates2D
vtkSynchronizedTemplates3DSynchronizedTemplates3D
vtkGridSynchronizedTemplates3DGridSynchronizedTemplates
vtkRectilinearSynchronizedTemplatesRectilinearSynchronizedTemplates

Member Typedef Documentation

Reimplemented from vtkPolyDataAlgorithm.

Definition at line 69 of file vtkContourFilter.h.


Constructor & Destructor Documentation

vtkContourFilter::vtkContourFilter (  )  [protected]

vtkContourFilter::~vtkContourFilter (  )  [protected]


Member Function Documentation

virtual const char* vtkContourFilter::GetClassName (  )  [virtual]

Reimplemented from vtkPolyDataAlgorithm.

static int vtkContourFilter::IsTypeOf ( const char *  name  )  [static]

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 vtkPolyDataAlgorithm.

virtual int vtkContourFilter::IsA ( const char *  name  )  [virtual]

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 vtkPolyDataAlgorithm.

static vtkContourFilter* vtkContourFilter::SafeDownCast ( vtkObject o  )  [static]

Reimplemented from vtkPolyDataAlgorithm.

void vtkContourFilter::PrintSelf ( ostream &  os,
vtkIndent  indent 
) [virtual]

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 vtkPolyDataAlgorithm.

static vtkContourFilter* vtkContourFilter::New (  )  [static]

Construct object with initial range (0,1) and single contour value of 0.0.

Reimplemented from vtkPolyDataAlgorithm.

void vtkContourFilter::SetValue ( int  i,
double  value 
) [inline]

Methods to set / get contour values.

Set a particular contour value at contour number i. The index i ranges between 0<=i<NumberOfContours.

Definition at line 193 of file vtkContourFilter.h.

double vtkContourFilter::GetValue ( int  i  )  [inline]

Get the ith contour value.

Definition at line 198 of file vtkContourFilter.h.

double * vtkContourFilter::GetValues (  )  [inline]

Get a pointer to an array of contour values. There will be GetNumberOfContours() values in the list.

Definition at line 205 of file vtkContourFilter.h.

void vtkContourFilter::GetValues ( double *  contourValues  )  [inline]

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 212 of file vtkContourFilter.h.

void vtkContourFilter::SetNumberOfContours ( int  number  )  [inline]

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 vtkContourFilter.h.

int vtkContourFilter::GetNumberOfContours (  )  [inline]

Get the number of contours in the list of contour values.

Definition at line 223 of file vtkContourFilter.h.

void vtkContourFilter::GenerateValues ( int  numContours,
double  range[2] 
) [inline]

Generate numContours equally spaced contour values between specified range. Contour values will include min/max range values.

Definition at line 230 of file vtkContourFilter.h.

void vtkContourFilter::GenerateValues ( int  numContours,
double  rangeStart,
double  rangeEnd 
) [inline]

Generate numContours equally spaced contour values between specified range. Contour values will include min/max range values.

Definition at line 237 of file vtkContourFilter.h.

unsigned long vtkContourFilter::GetMTime (  )  [virtual]

Modified GetMTime Because we delegate to vtkContourValues

Reimplemented from vtkObject.

virtual void vtkContourFilter::SetComputeNormals ( int   )  [virtual]

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 vtkContourFilter::GetComputeNormals (  )  [virtual]

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 void vtkContourFilter::ComputeNormalsOn (  )  [virtual]

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 void vtkContourFilter::ComputeNormalsOff (  )  [virtual]

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 void vtkContourFilter::SetComputeGradients ( int   )  [virtual]

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 vtkContourFilter::GetComputeGradients (  )  [virtual]

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 void vtkContourFilter::ComputeGradientsOn (  )  [virtual]

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 void vtkContourFilter::ComputeGradientsOff (  )  [virtual]

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 void vtkContourFilter::SetComputeScalars ( int   )  [virtual]

Set/Get the computation of scalars.

virtual int vtkContourFilter::GetComputeScalars (  )  [virtual]

Set/Get the computation of scalars.

virtual void vtkContourFilter::ComputeScalarsOn (  )  [virtual]

Set/Get the computation of scalars.

virtual void vtkContourFilter::ComputeScalarsOff (  )  [virtual]

Set/Get the computation of scalars.

virtual void vtkContourFilter::SetUseScalarTree ( int   )  [virtual]

Enable the use of a scalar tree to accelerate contour extraction.

virtual int vtkContourFilter::GetUseScalarTree (  )  [virtual]

Enable the use of a scalar tree to accelerate contour extraction.

virtual void vtkContourFilter::UseScalarTreeOn (  )  [virtual]

Enable the use of a scalar tree to accelerate contour extraction.

virtual void vtkContourFilter::UseScalarTreeOff (  )  [virtual]

Enable the use of a scalar tree to accelerate contour extraction.

virtual void vtkContourFilter::SetScalarTree ( vtkScalarTree  )  [virtual]

Enable the use of a scalar tree to accelerate contour extraction.

virtual vtkScalarTree* vtkContourFilter::GetScalarTree (  )  [virtual]

Enable the use of a scalar tree to accelerate contour extraction.

void vtkContourFilter::SetLocator ( vtkIncrementalPointLocator locator  ) 

Set / get a spatial locator for merging points. By default, an instance of vtkMergePoints is used.

virtual vtkIncrementalPointLocator* vtkContourFilter::GetLocator (  )  [virtual]

Set / get a spatial locator for merging points. By default, an instance of vtkMergePoints is used.

void vtkContourFilter::CreateDefaultLocator (  ) 

Create default locator. Used to create one when none is specified. The locator is used to merge coincident points.

void vtkContourFilter::SetArrayComponent ( int   ) 

Set/get which component of the scalar array to contour on; defaults to 0. Currently this feature only works if the input is a vtkImageData.

int vtkContourFilter::GetArrayComponent (  ) 

Set/get which component of the scalar array to contour on; defaults to 0. Currently this feature only works if the input is a vtkImageData.

virtual int vtkContourFilter::ProcessRequest ( vtkInformation ,
vtkInformationVector **  ,
vtkInformationVector  
) [virtual]

see vtkAlgorithm for details

Reimplemented from vtkPolyDataAlgorithm.

virtual void vtkContourFilter::ReportReferences ( vtkGarbageCollector  )  [protected, virtual]

Reimplemented from vtkAlgorithm.

virtual int vtkContourFilter::RequestData ( vtkInformation request,
vtkInformationVector **  inputVector,
vtkInformationVector outputVector 
) [protected, virtual]

This is called by the superclass. This is the method you should override.

Reimplemented from vtkPolyDataAlgorithm.

virtual int vtkContourFilter::RequestUpdateExtent ( vtkInformation ,
vtkInformationVector **  ,
vtkInformationVector  
) [protected, virtual]

This is called by the superclass. This is the method you should override.

Reimplemented from vtkPolyDataAlgorithm.

virtual int vtkContourFilter::FillInputPortInformation ( int  port,
vtkInformation info 
) [protected, virtual]

Fill the input port information objects for this algorithm. This is invoked by the first call to GetInputPortInformation for each port so subclasses can specify what they can handle.

Reimplemented from vtkPolyDataAlgorithm.


Member Data Documentation

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The documentation for this class was generated from the following file:

Generated on Mon Sep 27 18:20:47 2010 for VTK by  doxygen 1.5.6