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virtual vtkTypeBool | IsA (const char *type) |
| Return 1 if this class is the same type of (or a subclass of) the named class. More...
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vtkQuadricClustering * | NewInstance () const |
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void | PrintSelf (ostream &os, vtkIndent indent) override |
| Methods invoked by print to print information about the object including superclasses. More...
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void | SetNumberOfXDivisions (int num) |
| Set/Get the number of divisions along each axis for the spatial bins. More...
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void | SetNumberOfYDivisions (int num) |
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void | SetNumberOfZDivisions (int num) |
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virtual int | GetNumberOfXDivisions () |
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virtual int | GetNumberOfYDivisions () |
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virtual int | GetNumberOfZDivisions () |
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void | SetNumberOfDivisions (int div[3]) |
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void | SetNumberOfDivisions (int div0, int div1, int div2) |
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int * | GetNumberOfDivisions () |
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void | GetNumberOfDivisions (int div[3]) |
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virtual void | SetAutoAdjustNumberOfDivisions (vtkTypeBool) |
| Enable automatic adjustment of number of divisions. More...
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virtual vtkTypeBool | GetAutoAdjustNumberOfDivisions () |
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virtual void | AutoAdjustNumberOfDivisionsOn () |
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virtual void | AutoAdjustNumberOfDivisionsOff () |
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void | SetDivisionOrigin (double x, double y, double z) |
| This is an alternative way to set up the bins. More...
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void | SetDivisionOrigin (double o[3]) |
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virtual double * | GetDivisionOrigin () |
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virtual void | GetDivisionOrigin (double &, double &, double &) |
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virtual void | GetDivisionOrigin (double[3]) |
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void | SetDivisionSpacing (double x, double y, double z) |
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void | SetDivisionSpacing (double s[3]) |
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virtual double * | GetDivisionSpacing () |
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virtual void | GetDivisionSpacing (double &, double &, double &) |
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virtual void | GetDivisionSpacing (double[3]) |
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virtual void | SetUseInputPoints (vtkTypeBool) |
| Normally the point that minimizes the quadric error function is used as the output of the bin. More...
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virtual vtkTypeBool | GetUseInputPoints () |
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virtual void | UseInputPointsOn () |
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virtual void | UseInputPointsOff () |
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virtual void | SetUseFeatureEdges (vtkTypeBool) |
| By default, this flag is off. More...
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virtual vtkTypeBool | GetUseFeatureEdges () |
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virtual void | UseFeatureEdgesOn () |
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virtual void | UseFeatureEdgesOff () |
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vtkFeatureEdges * | GetFeatureEdges () |
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virtual void | SetUseFeaturePoints (vtkTypeBool) |
| By default, this flag is off. More...
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virtual vtkTypeBool | GetUseFeaturePoints () |
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virtual void | UseFeaturePointsOn () |
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virtual void | UseFeaturePointsOff () |
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virtual void | SetFeaturePointsAngle (double) |
| Set/Get the angle to use in determining whether a point on a boundary / feature edge is a feature point. More...
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virtual double | GetFeaturePointsAngle () |
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virtual void | SetUseInternalTriangles (vtkTypeBool) |
| When this flag is on (and it is on by default), then triangles that are completely contained in a bin are added to the bin quadrics. More...
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virtual vtkTypeBool | GetUseInternalTriangles () |
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virtual void | UseInternalTrianglesOn () |
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virtual void | UseInternalTrianglesOff () |
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void | StartAppend (double *bounds) |
| These methods provide an alternative way of executing the filter. More...
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void | StartAppend (double x0, double x1, double y0, double y1, double z0, double z1) |
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void | Append (vtkPolyData *piece) |
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void | EndAppend () |
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virtual void | SetCopyCellData (vtkTypeBool) |
| This flag makes the filter copy cell data from input to output (the best it can). More...
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virtual vtkTypeBool | GetCopyCellData () |
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virtual void | CopyCellDataOn () |
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virtual void | CopyCellDataOff () |
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virtual void | SetPreventDuplicateCells (vtkTypeBool) |
| Specify a boolean indicating whether to remove duplicate cells (i.e. More...
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virtual vtkTypeBool | GetPreventDuplicateCells () |
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virtual void | PreventDuplicateCellsOn () |
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virtual void | PreventDuplicateCellsOff () |
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vtkPolyDataAlgorithm * | NewInstance () const |
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vtkPolyData * | GetOutput () |
| Get the output data object for a port on this algorithm. More...
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vtkPolyData * | GetOutput (int) |
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virtual void | SetOutput (vtkDataObject *d) |
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int | ProcessRequest (vtkInformation *, vtkInformationVector **, vtkInformationVector *) override |
| see vtkAlgorithm for details More...
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vtkDataObject * | GetInput () |
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vtkDataObject * | GetInput (int port) |
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vtkPolyData * | GetPolyDataInput (int port) |
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void | SetInputData (vtkDataObject *) |
| Assign a data object as input. More...
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void | SetInputData (int, vtkDataObject *) |
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void | AddInputData (vtkDataObject *) |
| Assign a data object as input. More...
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void | AddInputData (int, vtkDataObject *) |
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vtkAlgorithm * | NewInstance () const |
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int | HasExecutive () |
| Check whether this algorithm has an assigned executive. More...
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vtkExecutive * | GetExecutive () |
| Get this algorithm's executive. More...
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virtual void | SetExecutive (vtkExecutive *executive) |
| Set this algorithm's executive. More...
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int | ProcessRequest (vtkInformation *request, vtkCollection *inInfo, vtkInformationVector *outInfo) |
| Version of ProcessRequest() that is wrapped. More...
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virtual int | ComputePipelineMTime (vtkInformation *request, vtkInformationVector **inInfoVec, vtkInformationVector *outInfoVec, int requestFromOutputPort, vtkMTimeType *mtime) |
| A special version of ProcessRequest meant specifically for the pipeline modified time request. More...
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virtual int | ModifyRequest (vtkInformation *request, int when) |
| This method gives the algorithm a chance to modify the contents of a request before or after (specified in the when argument) it is forwarded. More...
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vtkInformation * | GetInputPortInformation (int port) |
| Get the information object associated with an input port. More...
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vtkInformation * | GetOutputPortInformation (int port) |
| Get the information object associated with an output port. More...
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virtual vtkInformation * | GetInformation () |
| Set/Get the information object associated with this algorithm. More...
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virtual void | SetInformation (vtkInformation *) |
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int | GetNumberOfInputPorts () |
| Get the number of input ports used by the algorithm. More...
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int | GetNumberOfOutputPorts () |
| Get the number of output ports provided by the algorithm. More...
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void | Register (vtkObjectBase *o) override |
| Participate in garbage collection. More...
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void | UnRegister (vtkObjectBase *o) override |
| Decrease the reference count (release by another object). More...
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virtual void | SetAbortExecute (vtkTypeBool) |
| Set/Get the AbortExecute flag for the process object. More...
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virtual vtkTypeBool | GetAbortExecute () |
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virtual void | AbortExecuteOn () |
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virtual void | AbortExecuteOff () |
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virtual void | SetProgress (double) |
| Set/Get the execution progress of a process object. More...
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virtual double | GetProgress () |
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void | UpdateProgress (double amount) |
| Update the progress of the process object. More...
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void | SetProgressText (const char *ptext) |
| Set the current text message associated with the progress state. More...
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virtual char * | GetProgressText () |
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virtual unsigned long | GetErrorCode () |
| The error code contains a possible error that occurred while reading or writing the file. More...
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virtual void | SetInputArrayToProcess (int idx, int port, int connection, int fieldAssociation, const char *name) |
| Set the input data arrays that this algorithm will process. More...
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virtual void | SetInputArrayToProcess (int idx, int port, int connection, int fieldAssociation, int fieldAttributeType) |
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virtual void | SetInputArrayToProcess (int idx, vtkInformation *info) |
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virtual void | SetInputArrayToProcess (int idx, int port, int connection, const char *fieldAssociation, const char *attributeTypeorName) |
| String based versions of SetInputArrayToProcess(). More...
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vtkInformation * | GetInputArrayInformation (int idx) |
| Get the info object for the specified input array to this algorithm. More...
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void | RemoveAllInputs () |
| Remove all the input data. More...
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vtkDataObject * | GetOutputDataObject (int port) |
| Get the data object that will contain the algorithm output for the given port. More...
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vtkDataObject * | GetInputDataObject (int port, int connection) |
| Get the data object that will contain the algorithm input for the given port and given connection. More...
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virtual void | SetInputConnection (int port, vtkAlgorithmOutput *input) |
| Set the connection for the given input port index. More...
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virtual void | SetInputConnection (vtkAlgorithmOutput *input) |
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virtual void | AddInputConnection (int port, vtkAlgorithmOutput *input) |
| Add a connection to the given input port index. More...
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virtual void | AddInputConnection (vtkAlgorithmOutput *input) |
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virtual void | RemoveInputConnection (int port, vtkAlgorithmOutput *input) |
| Remove a connection from the given input port index. More...
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virtual void | RemoveInputConnection (int port, int idx) |
| Remove a connection given by index idx. More...
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virtual void | RemoveAllInputConnections (int port) |
| Removes all input connections. More...
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virtual void | SetInputDataObject (int port, vtkDataObject *data) |
| Sets the data-object as an input on the given port index. More...
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virtual void | SetInputDataObject (vtkDataObject *data) |
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virtual void | AddInputDataObject (int port, vtkDataObject *data) |
| Add the data-object as an input to this given port. More...
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virtual void | AddInputDataObject (vtkDataObject *data) |
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vtkAlgorithmOutput * | GetOutputPort (int index) |
| Get a proxy object corresponding to the given output port of this algorithm. More...
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vtkAlgorithmOutput * | GetOutputPort () |
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int | GetNumberOfInputConnections (int port) |
| Get the number of inputs currently connected to a port. More...
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int | GetTotalNumberOfInputConnections () |
| Get the total number of inputs for this algorithm. More...
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vtkAlgorithmOutput * | GetInputConnection (int port, int index) |
| Get the algorithm output port connected to an input port. More...
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vtkAlgorithm * | GetInputAlgorithm (int port, int index, int &algPort) |
| Returns the algorithm and the output port index of that algorithm connected to a port-index pair. More...
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vtkAlgorithm * | GetInputAlgorithm (int port, int index) |
| Returns the algorithm connected to a port-index pair. More...
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vtkAlgorithm * | GetInputAlgorithm () |
| Equivalent to GetInputAlgorithm(0, 0). More...
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vtkExecutive * | GetInputExecutive (int port, int index) |
| Returns the executive associated with a particular input connection. More...
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vtkExecutive * | GetInputExecutive () |
| Equivalent to GetInputExecutive(0, 0) More...
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vtkInformation * | GetInputInformation (int port, int index) |
| Return the information object that is associated with a particular input connection. More...
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vtkInformation * | GetInputInformation () |
| Equivalent to GetInputInformation(0, 0) More...
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vtkInformation * | GetOutputInformation (int port) |
| Return the information object that is associated with a particular output port. More...
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virtual void | Update (int port) |
| Bring this algorithm's outputs up-to-date. More...
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virtual void | Update () |
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virtual int | Update (int port, vtkInformationVector *requests) |
| This method enables the passing of data requests to the algorithm to be used during execution (in addition to bringing a particular port up-to-date). More...
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virtual int | Update (vtkInformation *requests) |
| Convenience method to update an algorithm after passing requests to its first output port. More...
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virtual int | UpdatePiece (int piece, int numPieces, int ghostLevels, const int extents[6]=nullptr) |
| Convenience method to update an algorithm after passing requests to its first output port. More...
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virtual int | UpdateExtent (const int extents[6]) |
| Convenience method to update an algorithm after passing requests to its first output port. More...
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virtual int | UpdateTimeStep (double time, int piece=-1, int numPieces=1, int ghostLevels=0, const int extents[6]=nullptr) |
| Convenience method to update an algorithm after passing requests to its first output port. More...
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virtual void | UpdateInformation () |
| Bring the algorithm's information up-to-date. More...
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virtual void | UpdateDataObject () |
| Create output object(s). More...
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virtual void | PropagateUpdateExtent () |
| Propagate meta-data upstream. More...
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virtual void | UpdateWholeExtent () |
| Bring this algorithm's outputs up-to-date. More...
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void | ConvertTotalInputToPortConnection (int ind, int &port, int &conn) |
| Convenience routine to convert from a linear ordering of input connections to a port/connection pair. More...
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virtual void | SetReleaseDataFlag (int) |
| Turn release data flag on or off for all output ports. More...
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virtual int | GetReleaseDataFlag () |
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void | ReleaseDataFlagOn () |
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void | ReleaseDataFlagOff () |
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int | UpdateExtentIsEmpty (vtkInformation *pinfo, vtkDataObject *output) |
| This detects when the UpdateExtent will generate no data This condition is satisfied when the UpdateExtent has zero volume (0,-1,...) or the UpdateNumberOfPieces is 0. More...
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int | UpdateExtentIsEmpty (vtkInformation *pinfo, int extentType) |
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int * | GetUpdateExtent () |
| These functions return the update extent for output ports that use 3D extents. More...
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int * | GetUpdateExtent (int port) |
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void | GetUpdateExtent (int &x0, int &x1, int &y0, int &y1, int &z0, int &z1) |
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void | GetUpdateExtent (int port, int &x0, int &x1, int &y0, int &y1, int &z0, int &z1) |
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void | GetUpdateExtent (int extent[6]) |
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void | GetUpdateExtent (int port, int extent[6]) |
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int | GetUpdatePiece () |
| These functions return the update extent for output ports that use piece extents. More...
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int | GetUpdatePiece (int port) |
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int | GetUpdateNumberOfPieces () |
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int | GetUpdateNumberOfPieces (int port) |
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int | GetUpdateGhostLevel () |
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int | GetUpdateGhostLevel (int port) |
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void | SetProgressObserver (vtkProgressObserver *) |
| If an ProgressObserver is set, the algorithm will report progress through it rather than directly. More...
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virtual vtkProgressObserver * | GetProgressObserver () |
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| vtkBaseTypeMacro (vtkObject, vtkObjectBase) |
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virtual void | DebugOn () |
| Turn debugging output on. More...
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virtual void | DebugOff () |
| Turn debugging output off. More...
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bool | GetDebug () |
| Get the value of the debug flag. More...
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void | SetDebug (bool debugFlag) |
| Set the value of the debug flag. More...
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virtual void | Modified () |
| Update the modification time for this object. More...
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virtual vtkMTimeType | GetMTime () |
| Return this object's modified time. More...
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unsigned long | AddObserver (unsigned long event, vtkCommand *, float priority=0.0f) |
| Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...
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unsigned long | AddObserver (const char *event, vtkCommand *, float priority=0.0f) |
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vtkCommand * | GetCommand (unsigned long tag) |
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void | RemoveObserver (vtkCommand *) |
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void | RemoveObservers (unsigned long event, vtkCommand *) |
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void | RemoveObservers (const char *event, vtkCommand *) |
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vtkTypeBool | HasObserver (unsigned long event, vtkCommand *) |
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vtkTypeBool | HasObserver (const char *event, vtkCommand *) |
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void | RemoveObserver (unsigned long tag) |
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void | RemoveObservers (unsigned long event) |
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void | RemoveObservers (const char *event) |
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void | RemoveAllObservers () |
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vtkTypeBool | HasObserver (unsigned long event) |
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vtkTypeBool | HasObserver (const char *event) |
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template<class U , class T > |
unsigned long | AddObserver (unsigned long event, U observer, void(T::*callback)(), float priority=0.0f) |
| Overloads to AddObserver that allow developers to add class member functions as callbacks for events. More...
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template<class U , class T > |
unsigned long | AddObserver (unsigned long event, U observer, void(T::*callback)(vtkObject *, unsigned long, void *), float priority=0.0f) |
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template<class U , class T > |
unsigned long | AddObserver (unsigned long event, U observer, bool(T::*callback)(vtkObject *, unsigned long, void *), float priority=0.0f) |
| Allow user to set the AbortFlagOn() with the return value of the callback method. More...
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int | InvokeEvent (unsigned long event, void *callData) |
| This method invokes an event and return whether the event was aborted or not. More...
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int | InvokeEvent (const char *event, void *callData) |
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int | InvokeEvent (unsigned long event) |
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int | InvokeEvent (const char *event) |
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const char * | GetClassName () const |
| Return the class name as a string. More...
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virtual void | Delete () |
| Delete a VTK object. More...
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virtual void | FastDelete () |
| Delete a reference to this object. More...
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void | InitializeObjectBase () |
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void | Print (ostream &os) |
| Print an object to an ostream. More...
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virtual void | PrintHeader (ostream &os, vtkIndent indent) |
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virtual void | PrintTrailer (ostream &os, vtkIndent indent) |
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int | GetReferenceCount () |
| Return the current reference count of this object. More...
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void | SetReferenceCount (int) |
| Sets the reference count. More...
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void | PrintRevisions (ostream &) |
| Legacy. More...
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virtual vtkObjectBase * | NewInstanceInternal () const |
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| vtkQuadricClustering () |
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| ~vtkQuadricClustering () override |
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int | RequestData (vtkInformation *, vtkInformationVector **, vtkInformationVector *) override |
| This is called by the superclass. More...
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int | FillInputPortInformation (int, vtkInformation *) override |
| Fill the input port information objects for this algorithm. More...
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vtkIdType | HashPoint (double point[3]) |
| Given a point, determine what bin it falls into. More...
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void | ComputeRepresentativePoint (double quadric[9], vtkIdType binId, double point[3]) |
| Determine the representative point for this bin. More...
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void | AddPolygons (vtkCellArray *polys, vtkPoints *points, int geometryFlag, vtkPolyData *input, vtkPolyData *output) |
| Add triangles to the quadric array. More...
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void | AddStrips (vtkCellArray *strips, vtkPoints *points, int geometryFlag, vtkPolyData *input, vtkPolyData *output) |
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void | AddTriangle (vtkIdType *binIds, double *pt0, double *pt1, double *pt2, int geometeryFlag, vtkPolyData *input, vtkPolyData *output) |
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void | AddEdges (vtkCellArray *edges, vtkPoints *points, int geometryFlag, vtkPolyData *input, vtkPolyData *output) |
| Add edges to the quadric array. More...
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void | AddEdge (vtkIdType *binIds, double *pt0, double *pt1, int geometeryFlag, vtkPolyData *input, vtkPolyData *output) |
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void | AddVertices (vtkCellArray *verts, vtkPoints *points, int geometryFlag, vtkPolyData *input, vtkPolyData *output) |
| Add vertices to the quadric array. More...
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void | AddVertex (vtkIdType binId, double *pt, int geometryFlag, vtkPolyData *input, vtkPolyData *output) |
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void | InitializeQuadric (double quadric[9]) |
| Initialize the quadric matrix to 0's. More...
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void | AddQuadric (vtkIdType binId, double quadric[9]) |
| Add this quadric to the quadric already associated with this bin. More...
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void | FindFeaturePoints (vtkCellArray *edges, vtkPoints *edgePts, double angle) |
| Find the feature points of a given set of edges. More...
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void | EndAppendUsingPoints (vtkPolyData *input, vtkPolyData *output) |
| This method will rep[lace the quadric generated points with the input points with the lowest error. More...
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void | EndAppendVertexGeometry (vtkPolyData *input, vtkPolyData *output) |
| This method sets the vertices of the output. More...
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void | AppendFeatureQuadrics (vtkPolyData *pd, vtkPolyData *output) |
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| vtkPolyDataAlgorithm () |
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| ~vtkPolyDataAlgorithm () override |
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virtual int | RequestInformation (vtkInformation *request, vtkInformationVector **inputVector, vtkInformationVector *outputVector) |
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virtual int | RequestUpdateExtent (vtkInformation *, vtkInformationVector **, vtkInformationVector *) |
| This is called by the superclass. More...
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int | FillOutputPortInformation (int port, vtkInformation *info) override |
| Fill the output port information objects for this algorithm. More...
|
|
| vtkAlgorithm () |
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| ~vtkAlgorithm () override |
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virtual void | SetNumberOfInputPorts (int n) |
| Set the number of input ports used by the algorithm. More...
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virtual void | SetNumberOfOutputPorts (int n) |
| Set the number of output ports provided by the algorithm. More...
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int | InputPortIndexInRange (int index, const char *action) |
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int | OutputPortIndexInRange (int index, const char *action) |
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int | GetInputArrayAssociation (int idx, vtkInformationVector **inputVector) |
| Get the assocition of the actual data array for the input array specified by idx, this is only reasonable during the REQUEST_DATA pass. More...
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int | GetInputArrayAssociation (int idx, int connection, vtkInformationVector **inputVector) |
| Filters that have multiple connections on one port can use this signature. More...
|
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int | GetInputArrayAssociation (int idx, vtkDataObject *input) |
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vtkDataArray * | GetInputArrayToProcess (int idx, vtkInformationVector **inputVector) |
| Get the actual data array for the input array specified by idx, this is only reasonable during the REQUEST_DATA pass. More...
|
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vtkDataArray * | GetInputArrayToProcess (int idx, vtkInformationVector **inputVector, int &association) |
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vtkDataArray * | GetInputArrayToProcess (int idx, int connection, vtkInformationVector **inputVector) |
| Filters that have multiple connections on one port can use this signature. More...
|
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vtkDataArray * | GetInputArrayToProcess (int idx, int connection, vtkInformationVector **inputVector, int &association) |
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vtkDataArray * | GetInputArrayToProcess (int idx, vtkDataObject *input) |
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vtkDataArray * | GetInputArrayToProcess (int idx, vtkDataObject *input, int &association) |
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vtkAbstractArray * | GetInputAbstractArrayToProcess (int idx, vtkInformationVector **inputVector) |
| Get the actual data array for the input array specified by idx, this is only reasonable during the REQUEST_DATA pass. More...
|
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vtkAbstractArray * | GetInputAbstractArrayToProcess (int idx, vtkInformationVector **inputVector, int &association) |
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vtkAbstractArray * | GetInputAbstractArrayToProcess (int idx, int connection, vtkInformationVector **inputVector) |
| Filters that have multiple connections on one port can use this signature. More...
|
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vtkAbstractArray * | GetInputAbstractArrayToProcess (int idx, int connection, vtkInformationVector **inputVector, int &association) |
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vtkAbstractArray * | GetInputAbstractArrayToProcess (int idx, vtkDataObject *input) |
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vtkAbstractArray * | GetInputAbstractArrayToProcess (int idx, vtkDataObject *input, int &association) |
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vtkInformation * | GetInputArrayFieldInformation (int idx, vtkInformationVector **inputVector) |
| This method takes in an index (as specified in SetInputArrayToProcess) and a pipeline information vector. More...
|
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virtual vtkExecutive * | CreateDefaultExecutive () |
| Create a default executive. More...
|
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virtual void | SetErrorCode (unsigned long) |
| The error code contains a possible error that occurred while reading or writing the file. More...
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void | ReportReferences (vtkGarbageCollector *) override |
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virtual void | SetNthInputConnection (int port, int index, vtkAlgorithmOutput *input) |
| Replace the Nth connection on the given input port. More...
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virtual void | SetNumberOfInputConnections (int port, int n) |
| Set the number of input connections on the given input port. More...
|
|
void | SetInputDataInternal (int port, vtkDataObject *input) |
| These methods are used by subclasses to implement methods to set data objects directly as input. More...
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void | AddInputDataInternal (int port, vtkDataObject *input) |
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| vtkObject () |
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| ~vtkObject () override |
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void | RegisterInternal (vtkObjectBase *, vtkTypeBool check) override |
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void | UnRegisterInternal (vtkObjectBase *, vtkTypeBool check) override |
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void | InternalGrabFocus (vtkCommand *mouseEvents, vtkCommand *keypressEvents=nullptr) |
| These methods allow a command to exclusively grab all events. More...
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void | InternalReleaseFocus () |
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| vtkObjectBase () |
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virtual | ~vtkObjectBase () |
|
virtual void | CollectRevisions (ostream &) |
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| vtkObjectBase (const vtkObjectBase &) |
|
void | operator= (const vtkObjectBase &) |
|
reduce the number of triangles in a mesh
vtkQuadricClustering is a filter to reduce the number of triangles in a triangle mesh, forming a good approximation to the original geometry. The input to vtkQuadricClustering is a vtkPolyData object, and all types of polygonal data are handled.
The algorithm used is the one described by Peter Lindstrom in his Siggraph 2000 paper, "Out-of-Core Simplification of Large Polygonal Models." The general approach of the algorithm is to cluster vertices in a uniform binning of space, accumulating the quadric of each triangle (pushed out to the triangles vertices) within each bin, and then determining an optimal position for a single vertex in a bin by using the accumulated quadric. In more detail, the algorithm first gets the bounds of the input poly data. It then breaks this bounding volume into a user-specified number of spatial bins. It then reads each triangle from the input and hashes its vertices into these bins. (If this is the first time a bin has been visited, initialize its quadric to the 0 matrix.) The algorithm computes the error quadric for this triangle and adds it to the existing quadric of the bin in which each vertex is contained. Then, if 2 or more vertices of the triangle fall in the same bin, the triangle is dicarded. If the triangle is not discarded, it adds the triangle to the list of output triangles as a list of vertex identifiers. (There is one vertex id per bin.) After all the triangles have been read, the representative vertex for each bin is computed (an optimal location is found) using the quadric for that bin. This determines the spatial location of the vertices of each of the triangles in the output.
To use this filter, specify the divisions defining the spatial subdivision in the x, y, and z directions. You must also specify an input vtkPolyData. Then choose to either 1) use the original points that minimize the quadric error to produce the output triangles or 2) compute an optimal position in each bin to produce the output triangles (recommended and default behavior).
This filter can take multiple inputs. To do this, the user must explicitly call StartAppend, Append (once for each input), and EndAppend. StartAppend sets up the data structure to hold the quadric matrices. Append processes each triangle in the input poly data it was called on, hashes its vertices to the appropriate bins, determines whether to keep this triangle, and updates the appropriate quadric matrices. EndAppend determines the spatial location of each of the representative vertices for the visited bins. While this approach does not fit into the visualization architecture and requires manual control, it has the advantage that extremely large data can be processed in pieces and appended to the filter piece-by-piece.
- Warning
- This filter can drastically affect topology, i.e., topology is not preserved.
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The filter handles input triangle strips and arbitrary polygons. Arbitrary polygons are assumed convex: during insertion they are triangulated using a fan of triangles from the first point in the polygons. If the polygon is concave, this can produce bad results. In this case, use vtkTriangleFilter to triangulate the polygons first.
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The filter also treats polylines and vertices.
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Note that for certain types of geometry (e.g., a mostly 2D plane with jitter in the normal direction), the decimator can perform badly. In this situation, set the number of bins in the normal direction to one.
- See also
- vtkQuadricDecimation vtkDecimatePro vtkDecimate vtkQuadricLODActor
- Tests:
- vtkQuadricClustering (Tests)
Definition at line 100 of file vtkQuadricClustering.h.