generate isosurfaces/isolines from scalar values (specialized for unstructured grids)
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#include <vtkContourGrid.h>
Inherits vtkPolyDataAlgorithm.
generate isosurfaces/isolines from scalar values (specialized for unstructured grids)
vtkContourGrid is a filter that takes as input datasets of type vtkUnstructuredGrid 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 of the resulting isosurface.
- See Also
- vtkMarchingContourFilter vtkKitwareContourFilter vtkMarchingCubes vtkSliceCubes vtkDividingCubes vtkMarchingSquares vtkImageMarchingCubes
Definition at line 60 of file vtkContourGrid.h.
vtkContourGrid::vtkContourGrid |
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vtkContourGrid::~vtkContourGrid |
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static int vtkContourGrid::IsTypeOf |
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const char * |
type | ) |
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virtual int vtkContourGrid::IsA |
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const char * |
type | ) |
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static vtkContourGrid* vtkContourGrid::SafeDownCast |
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vtkObjectBase * |
o | ) |
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virtual vtkObjectBase* vtkContourGrid::NewInstanceInternal |
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const |
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void vtkContourGrid::PrintSelf |
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ostream & |
os, |
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vtkIndent |
indent |
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Construct object with initial range (0,1) and single contour value of 0.0.
void vtkContourGrid::SetValue |
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int |
i, |
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double |
value |
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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 180 of file vtkContourGrid.h.
double vtkContourGrid::GetValue |
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int |
i | ) |
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double * vtkContourGrid::GetValues |
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void vtkContourGrid::GetValues |
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double * |
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 201 of file vtkContourGrid.h.
void vtkContourGrid::SetNumberOfContours |
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int |
number | ) |
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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 209 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 215 of file vtkContourGrid.h.
void vtkContourGrid::GenerateValues |
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int |
numContours, |
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double |
range[2] |
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) |
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Generate numContours equally spaced contour values between specified range. Contour values will include min/max range values.
Definition at line 222 of file vtkContourGrid.h.
void vtkContourGrid::GenerateValues |
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int |
numContours, |
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double |
rangeStart, |
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double |
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 229 of file vtkContourGrid.h.
unsigned long vtkContourGrid::GetMTime |
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Modified GetMTime Because we delegate to vtkContourValues
virtual void vtkContourGrid::SetComputeNormals |
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int |
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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 vtkContourGrid::GetComputeNormals |
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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 void vtkContourGrid::ComputeNormalsOn |
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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 void vtkContourGrid::ComputeNormalsOff |
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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 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.
- Deprecated:
- ComputeGradients is not used so these methods don't affect anything (VTK 6.0).
virtual int vtkContourGrid::GetComputeGradients |
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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.
- Deprecated:
- ComputeGradients is not used so these methods don't affect anything (VTK 6.0).
virtual void vtkContourGrid::ComputeGradientsOn |
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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.
- Deprecated:
- ComputeGradients is not used so these methods don't affect anything (VTK 6.0).
virtual void vtkContourGrid::ComputeGradientsOff |
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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.
- Deprecated:
- ComputeGradients is not used so these methods don't affect anything (VTK 6.0).
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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Set/Get the computation of scalars.
virtual void vtkContourGrid::ComputeScalarsOn |
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Set/Get the computation of scalars.
virtual void vtkContourGrid::ComputeScalarsOff |
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Set/Get the computation of scalars.
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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Enable the use of a scalar tree to accelerate contour extraction.
virtual void vtkContourGrid::UseScalarTreeOn |
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Enable the use of a scalar tree to accelerate contour extraction.
virtual void vtkContourGrid::UseScalarTreeOff |
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Enable the use of a scalar tree to accelerate contour extraction.
void vtkContourGrid::SetLocator |
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vtkIncrementalPointLocator * |
locator | ) |
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Set / get a spatial locator for merging points. By default, an instance of vtkMergePoints is used.
virtual vtkIncrementalPointLocator* vtkContourGrid::GetLocator |
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Set / get a spatial locator for merging points. By default, an instance of vtkMergePoints is used.
virtual void vtkContourGrid::SetGenerateTriangles |
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int |
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If this is enabled (by default), the output will be triangles otherwise, the output will be the intersection polygons WARNING: if the cutting function is not a plane, the output will be 3D poygons, which might be nice to look at but hard to compute with downstream.
virtual int vtkContourGrid::GetGenerateTriangles |
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If this is enabled (by default), the output will be triangles otherwise, the output will be the intersection polygons WARNING: if the cutting function is not a plane, the output will be 3D poygons, which might be nice to look at but hard to compute with downstream.
virtual void vtkContourGrid::GenerateTrianglesOn |
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If this is enabled (by default), the output will be triangles otherwise, the output will be the intersection polygons WARNING: if the cutting function is not a plane, the output will be 3D poygons, which might be nice to look at but hard to compute with downstream.
virtual void vtkContourGrid::GenerateTrianglesOff |
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If this is enabled (by default), the output will be triangles otherwise, the output will be the intersection polygons WARNING: if the cutting function is not a plane, the output will be 3D poygons, which might be nice to look at but hard to compute with downstream.
void vtkContourGrid::CreateDefaultLocator |
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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::SetOutputPointsPrecision |
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int |
precision | ) |
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Set/get the desired precision for the output types. See the documentation for the vtkAlgorithm::DesiredOutputPrecision enum for an explaination of the available precision settings.
int vtkContourGrid::GetOutputPointsPrecision |
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const |
Set/get the desired precision for the output types. See the documentation for the vtkAlgorithm::DesiredOutputPrecision enum for an explaination of the available precision settings.
virtual int vtkContourGrid::RequestData |
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vtkInformation * |
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vtkInformationVector ** |
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vtkInformationVector * |
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virtual int vtkContourGrid::FillInputPortInformation |
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int |
port, |
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vtkInformation * |
info |
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) |
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protectedvirtual |
vtkContourValues* vtkContourGrid::ContourValues |
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int vtkContourGrid::ComputeNormals |
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int vtkContourGrid::ComputeGradients |
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protected |
int vtkContourGrid::ComputeScalars |
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protected |
int vtkContourGrid::GenerateTriangles |
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vtkIncrementalPointLocator* vtkContourGrid::Locator |
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int vtkContourGrid::UseScalarTree |
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int vtkContourGrid::OutputPointsPrecision |
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protected |
vtkScalarTree* vtkContourGrid::ScalarTree |
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protected |
vtkEdgeTable* vtkContourGrid::EdgeTable |
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protected |
The documentation for this class was generated from the following file: