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vtkConnectivityFilter Class Reference
extract data based on geometric connectivity.
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#include <vtkConnectivityFilter.h>
Inheritance diagram for vtkConnectivityFilter:
[legend]Collaboration diagram for vtkConnectivityFilter:
[legend]List of all members.
Detailed Description
extract data based on geometric connectivity.
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Date:
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2000/12/10 20:08:32
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Revision:
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1.44
vtkConnectivityFilter is a filter that extracts cells that share common points and/or meet other connectivity criterion. (Cells that share vertices and meet other connectivity criterion such as scalar range are known as a region.) The filter works in one of six ways: 1) extract the largest connected region in the dataset; 2) extract specified region numbers; 3) extract all regions sharing specified point ids; 4) extract all regions sharing specified cell ids; 5) extract the region closest to the specified point; or 6) extract all regions (used to color the data by region).
vtkConnectivityFilter is generalized to handle any type of input dataset. It generates output data of type vtkUnstructuredGrid. If you know that your input type is vtkPolyData, you may wish to use vtkPolyDataConnectivityFilter.
The behavior of vtkConnectivityFilter can be modified by turning on the boolean ivar ScalarConnectivity. If this flag is on, the connectivity algorithm is modified so that cells are considered connected only if 1) they are geometrically connected (share a point) and 2) the scalar values of one of the cell's points falls in the scalar range specified. This use of ScalarConnectivity is particularly useful for volume datasets: it can be used as a simple "connected segmentation" algorithm. For example, by using a seed voxel (i.e., cell) on a known anatomical structure, connectivity will pull out all voxels "containing" the anatomical structure. These voxels can then be contoured or processed by other visualization filters.
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See also:
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vtkPolyDataConnectivityFilter
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Examples:
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vtkConnectivityFilter (examples)
Definition at line 91 of file vtkConnectivityFilter.h.
Constructor & Destructor Documentation
| vtkConnectivityFilter::vtkConnectivityFilter |
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| vtkConnectivityFilter::~vtkConnectivityFilter |
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| vtkConnectivityFilter::vtkConnectivityFilter |
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const vtkConnectivityFilter & |
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Member Function Documentation
| virtual const char* vtkConnectivityFilter::GetClassName |
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| int vtkConnectivityFilter::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 vtkDataSetToUnstructuredGridFilter. |
| virtual int vtkConnectivityFilter::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 vtkDataSetToUnstructuredGridFilter. |
| vtkConnectivityFilter* vtkConnectivityFilter::SafeDownCast |
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vtkObject * |
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| void vtkConnectivityFilter::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. |
| vtkConnectivityFilter* vtkConnectivityFilter::New |
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| virtual void vtkConnectivityFilter::SetScalarConnectivity |
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int |
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Turn on/off connectivity based on scalar value. If on, cells are connected only if they share points AND one of the cells scalar values falls in the scalar range specified. |
| virtual int vtkConnectivityFilter::GetScalarConnectivity |
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| virtual void vtkConnectivityFilter::ScalarConnectivityOn |
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| virtual void vtkConnectivityFilter::ScalarConnectivityOff |
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| virtual void vtkConnectivityFilter::SetScalarRange |
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float |
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float |
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Set the scalar range to use to extract cells based on scalar connectivity. |
| void vtkConnectivityFilter::SetScalarRange |
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float |
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| virtual float* vtkConnectivityFilter::GetScalarRange |
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| virtual void vtkConnectivityFilter::GetScalarRange |
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float & |
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float & |
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| virtual void vtkConnectivityFilter::GetScalarRange |
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float |
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| virtual void vtkConnectivityFilter::SetExtractionMode |
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int |
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Control the extraction of connected surfaces. |
| virtual int vtkConnectivityFilter::GetExtractionMode |
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| void vtkConnectivityFilter::SetExtractionModeToPointSeededRegions |
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| void vtkConnectivityFilter::SetExtractionModeToCellSeededRegions |
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| void vtkConnectivityFilter::SetExtractionModeToLargestRegion |
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| void vtkConnectivityFilter::SetExtractionModeToSpecifiedRegions |
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| void vtkConnectivityFilter::SetExtractionModeToClosestPointRegion |
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| void vtkConnectivityFilter::SetExtractionModeToAllRegions |
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| const char * vtkConnectivityFilter::GetExtractionModeAsString |
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void |
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| void vtkConnectivityFilter::InitializeSeedList |
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Initialize list of point ids/cell ids used to seed regions. |
| void vtkConnectivityFilter::AddSeed |
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int |
id |
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Add a seed id (point or cell id). Note: ids are 0-offset. |
| void vtkConnectivityFilter::DeleteSeed |
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int |
id |
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Delete a seed id (point or cell id). Note: ids are 0-offset. |
| void vtkConnectivityFilter::InitializeSpecifiedRegionList |
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Initialize list of region ids to extract. |
| void vtkConnectivityFilter::AddSpecifiedRegion |
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int |
id |
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Add a region id to extract. Note: ids are 0-offset. |
| void vtkConnectivityFilter::DeleteSpecifiedRegion |
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int |
id |
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Delete a region id to extract. Note: ids are 0-offset. |
| virtual void vtkConnectivityFilter::SetClosestPoint |
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float |
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float |
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float |
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Use to specify x-y-z point coordinates when extracting the region closest to a specified point. |
| virtual void vtkConnectivityFilter::SetClosestPoint |
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float |
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| virtual float* vtkConnectivityFilter::GetClosestPoint |
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| virtual void vtkConnectivityFilter::GetClosestPoint |
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float |
data[3] |
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| int vtkConnectivityFilter::GetNumberOfExtractedRegions |
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Obtain the number of connected regions. |
| virtual void vtkConnectivityFilter::SetColorRegions |
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int |
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Turn on/off the coloring of connected regions. |
| virtual int vtkConnectivityFilter::GetColorRegions |
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| virtual void vtkConnectivityFilter::ColorRegionsOn |
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| virtual void vtkConnectivityFilter::ColorRegionsOff |
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| void vtkConnectivityFilter::SetMaxRecursionDepth |
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int |
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FOR LEGACY COMPATIBILITY ONLY, DO NOT USE. The connectivity extraction algorithm works recursively. In some systems the stack depth is limited. This methods specifies the maximum recursion depth.
Definition at line 165 of file vtkConnectivityFilter.h. |
| int vtkConnectivityFilter::GetMaxRecursionDepth |
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| void vtkConnectivityFilter::operator= |
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const vtkConnectivityFilter & |
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[inline, protected] |
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| void vtkConnectivityFilter::Execute |
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| void vtkConnectivityFilter::TraverseAndMark |
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Member Data Documentation
int vtkConnectivityFilter::ColorRegions [protected]
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int vtkConnectivityFilter::ExtractionMode [protected]
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vtkIdList* vtkConnectivityFilter::Seeds [protected]
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vtkIdList* vtkConnectivityFilter::SpecifiedRegionIds [protected]
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vtkIntArray* vtkConnectivityFilter::RegionSizes [protected]
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float vtkConnectivityFilter::ClosestPoint[3] [protected]
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int vtkConnectivityFilter::ScalarConnectivity [protected]
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float vtkConnectivityFilter::ScalarRange[2] [protected]
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The documentation for this class was generated from the following file:
Generated on Wed Nov 21 12:47:01 2001 for VTK by
1.2.11.1 written by Dimitri van Heesch,
© 1997-2001