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vtkDecimatePro Class Reference

reduce the number of triangles in a mesh More...

#include <vtkDecimatePro.h>

Inheritance diagram for vtkDecimatePro:
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Collaboration diagram for vtkDecimatePro:
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Classes

class  LocalTri
 
class  LocalVertex
 
class  TriArray
 
class  VertexArray
 

Public Types

typedef vtkPolyDataAlgorithm Superclass
 
- Public Types inherited from vtkPolyDataAlgorithm
typedef vtkAlgorithm Superclass
 
- Public Types inherited from vtkAlgorithm
enum  DesiredOutputPrecision { SINGLE_PRECISION, DOUBLE_PRECISION, DEFAULT_PRECISION }
 Values used for setting the desired output precision for various algorithms. More...
 
typedef vtkObject Superclass
 

Public Member Functions

virtual vtkTypeBool IsA (const char *type)
 Return 1 if this class is the same type of (or a subclass of) the named class. More...
 
vtkDecimateProNewInstance () const
 
void PrintSelf (ostream &os, vtkIndent indent) override
 Methods invoked by print to print information about the object including superclasses. More...
 
virtual void SetTargetReduction (double)
 Specify the desired reduction in the total number of polygons (e.g., if TargetReduction is set to 0.9, this filter will try to reduce the data set to 10% of its original size). More...
 
virtual double GetTargetReduction ()
 
virtual void SetPreserveTopology (vtkTypeBool)
 Turn on/off whether to preserve the topology of the original mesh. More...
 
virtual vtkTypeBool GetPreserveTopology ()
 
virtual void PreserveTopologyOn ()
 
virtual void PreserveTopologyOff ()
 
virtual void SetFeatureAngle (double)
 Specify the mesh feature angle. More...
 
virtual double GetFeatureAngle ()
 
virtual void SetSplitting (vtkTypeBool)
 Turn on/off the splitting of the mesh at corners, along edges, at non-manifold points, or anywhere else a split is required. More...
 
virtual vtkTypeBool GetSplitting ()
 
virtual void SplittingOn ()
 
virtual void SplittingOff ()
 
virtual void SetSplitAngle (double)
 Specify the mesh split angle. More...
 
virtual double GetSplitAngle ()
 
virtual void SetPreSplitMesh (vtkTypeBool)
 In some cases you may wish to split the mesh prior to algorithm execution. More...
 
virtual vtkTypeBool GetPreSplitMesh ()
 
virtual void PreSplitMeshOn ()
 
virtual void PreSplitMeshOff ()
 
virtual void SetMaximumError (double)
 Set the largest decimation error that is allowed during the decimation process. More...
 
virtual double GetMaximumError ()
 
virtual void SetAccumulateError (vtkTypeBool)
 The computed error can either be computed directly from the mesh or the error may be accumulated as the mesh is modified. More...
 
virtual vtkTypeBool GetAccumulateError ()
 
virtual void AccumulateErrorOn ()
 
virtual void AccumulateErrorOff ()
 
virtual void SetErrorIsAbsolute (int)
 The MaximumError is normally defined as a fraction of the dataset bounding diagonal. More...
 
virtual int GetErrorIsAbsolute ()
 
virtual void SetAbsoluteError (double)
 Same as MaximumError, but to be used when ErrorIsAbsolute is 1. More...
 
virtual double GetAbsoluteError ()
 
virtual void SetBoundaryVertexDeletion (vtkTypeBool)
 Turn on/off the deletion of vertices on the boundary of a mesh. More...
 
virtual vtkTypeBool GetBoundaryVertexDeletion ()
 
virtual void BoundaryVertexDeletionOn ()
 
virtual void BoundaryVertexDeletionOff ()
 
virtual void SetDegree (int)
 If the number of triangles connected to a vertex exceeds "Degree", then the vertex will be split. More...
 
virtual int GetDegree ()
 
virtual void SetInflectionPointRatio (double)
 Specify the inflection point ratio. More...
 
virtual double GetInflectionPointRatio ()
 
vtkIdType GetNumberOfInflectionPoints ()
 Get the number of inflection points. More...
 
void GetInflectionPoints (double *inflectionPoints)
 Get a list of inflection points. More...
 
double * GetInflectionPoints ()
 Get a list of inflection points. More...
 
virtual void SetOutputPointsPrecision (int)
 Set/get the desired precision for the output types. More...
 
virtual int GetOutputPointsPrecision ()
 
- Public Member Functions inherited from vtkPolyDataAlgorithm
vtkPolyDataAlgorithmNewInstance () const
 
vtkPolyDataGetOutput ()
 Get the output data object for a port on this algorithm. More...
 
vtkPolyDataGetOutput (int)
 
virtual void SetOutput (vtkDataObject *d)
 
vtkTypeBool ProcessRequest (vtkInformation *, vtkInformationVector **, vtkInformationVector *) override
 see vtkAlgorithm for details More...
 
vtkDataObjectGetInput ()
 
vtkDataObjectGetInput (int port)
 
vtkPolyDataGetPolyDataInput (int port)
 
void SetInputData (vtkDataObject *)
 Assign a data object as input. More...
 
void SetInputData (int, vtkDataObject *)
 
void AddInputData (vtkDataObject *)
 Assign a data object as input. More...
 
void AddInputData (int, vtkDataObject *)
 
- Public Member Functions inherited from vtkAlgorithm
vtkAlgorithmNewInstance () const
 
int HasExecutive ()
 Check whether this algorithm has an assigned executive. More...
 
vtkExecutiveGetExecutive ()
 Get this algorithm's executive. More...
 
virtual void SetExecutive (vtkExecutive *executive)
 Set this algorithm's executive. More...
 
vtkTypeBool ProcessRequest (vtkInformation *request, vtkCollection *inInfo, vtkInformationVector *outInfo)
 Version of ProcessRequest() that is wrapped. More...
 
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...
 
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...
 
vtkInformationGetInputPortInformation (int port)
 Get the information object associated with an input port. More...
 
vtkInformationGetOutputPortInformation (int port)
 Get the information object associated with an output port. More...
 
virtual vtkInformationGetInformation ()
 Set/Get the information object associated with this algorithm. More...
 
virtual void SetInformation (vtkInformation *)
 
int GetNumberOfInputPorts ()
 Get the number of input ports used by the algorithm. More...
 
int GetNumberOfOutputPorts ()
 Get the number of output ports provided by the algorithm. More...
 
void Register (vtkObjectBase *o) override
 Participate in garbage collection. More...
 
void UnRegister (vtkObjectBase *o) override
 Decrease the reference count (release by another object). More...
 
virtual void SetAbortExecute (vtkTypeBool)
 Set/Get the AbortExecute flag for the process object. More...
 
virtual vtkTypeBool GetAbortExecute ()
 
virtual void AbortExecuteOn ()
 
virtual void AbortExecuteOff ()
 
virtual double GetProgress ()
 Get the execution progress of a process object. More...
 
void SetProgress (double)
 SetProgress is deprecated. More...
 
void UpdateProgress (double amount)
 Update the progress of the process object. More...
 
void SetProgressShiftScale (double shift, double scale)
 Specify the shift and scale values to use to apply to the progress amount when UpdateProgress is called. More...
 
virtual double GetProgressShift ()
 
virtual double GetProgressScale ()
 
void SetProgressText (const char *ptext)
 Set the current text message associated with the progress state. More...
 
virtual char * GetProgressText ()
 
virtual unsigned long GetErrorCode ()
 The error code contains a possible error that occurred while reading or writing the file. More...
 
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...
 
virtual void SetInputArrayToProcess (int idx, int port, int connection, int fieldAssociation, int fieldAttributeType)
 
virtual void SetInputArrayToProcess (int idx, vtkInformation *info)
 
virtual void SetInputArrayToProcess (int idx, int port, int connection, const char *fieldAssociation, const char *attributeTypeorName)
 String based versions of SetInputArrayToProcess(). More...
 
vtkInformationGetInputArrayInformation (int idx)
 Get the info object for the specified input array to this algorithm. More...
 
void RemoveAllInputs ()
 Remove all the input data. More...
 
vtkDataObjectGetOutputDataObject (int port)
 Get the data object that will contain the algorithm output for the given port. More...
 
vtkDataObjectGetInputDataObject (int port, int connection)
 Get the data object that will contain the algorithm input for the given port and given connection. More...
 
virtual void SetInputConnection (int port, vtkAlgorithmOutput *input)
 Set the connection for the given input port index. More...
 
virtual void SetInputConnection (vtkAlgorithmOutput *input)
 
virtual void AddInputConnection (int port, vtkAlgorithmOutput *input)
 Add a connection to the given input port index. More...
 
virtual void AddInputConnection (vtkAlgorithmOutput *input)
 
virtual void RemoveInputConnection (int port, vtkAlgorithmOutput *input)
 Remove a connection from the given input port index. More...
 
virtual void RemoveInputConnection (int port, int idx)
 Remove a connection given by index idx. More...
 
virtual void RemoveAllInputConnections (int port)
 Removes all input connections. More...
 
virtual void SetInputDataObject (int port, vtkDataObject *data)
 Sets the data-object as an input on the given port index. More...
 
virtual void SetInputDataObject (vtkDataObject *data)
 
virtual void AddInputDataObject (int port, vtkDataObject *data)
 Add the data-object as an input to this given port. More...
 
virtual void AddInputDataObject (vtkDataObject *data)
 
vtkAlgorithmOutputGetOutputPort (int index)
 Get a proxy object corresponding to the given output port of this algorithm. More...
 
vtkAlgorithmOutputGetOutputPort ()
 
int GetNumberOfInputConnections (int port)
 Get the number of inputs currently connected to a port. More...
 
int GetTotalNumberOfInputConnections ()
 Get the total number of inputs for this algorithm. More...
 
vtkAlgorithmOutputGetInputConnection (int port, int index)
 Get the algorithm output port connected to an input port. More...
 
vtkAlgorithmGetInputAlgorithm (int port, int index, int &algPort)
 Returns the algorithm and the output port index of that algorithm connected to a port-index pair. More...
 
vtkAlgorithmGetInputAlgorithm (int port, int index)
 Returns the algorithm connected to a port-index pair. More...
 
vtkAlgorithmGetInputAlgorithm ()
 Equivalent to GetInputAlgorithm(0, 0). More...
 
vtkExecutiveGetInputExecutive (int port, int index)
 Returns the executive associated with a particular input connection. More...
 
vtkExecutiveGetInputExecutive ()
 Equivalent to GetInputExecutive(0, 0) More...
 
vtkInformationGetInputInformation (int port, int index)
 Return the information object that is associated with a particular input connection. More...
 
vtkInformationGetInputInformation ()
 Equivalent to GetInputInformation(0, 0) More...
 
vtkInformationGetOutputInformation (int port)
 Return the information object that is associated with a particular output port. More...
 
virtual void Update (int port)
 Bring this algorithm's outputs up-to-date. More...
 
virtual void Update ()
 
virtual vtkTypeBool 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...
 
virtual vtkTypeBool Update (vtkInformation *requests)
 Convenience method to update an algorithm after passing requests to its first output port. More...
 
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...
 
virtual int UpdateExtent (const int extents[6])
 Convenience method to update an algorithm after passing requests to its first output port. More...
 
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...
 
virtual void UpdateInformation ()
 Bring the algorithm's information up-to-date. More...
 
virtual void UpdateDataObject ()
 Create output object(s). More...
 
virtual void PropagateUpdateExtent ()
 Propagate meta-data upstream. More...
 
virtual void UpdateWholeExtent ()
 Bring this algorithm's outputs up-to-date. More...
 
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...
 
virtual void SetReleaseDataFlag (int)
 Turn release data flag on or off for all output ports. More...
 
virtual int GetReleaseDataFlag ()
 
void ReleaseDataFlagOn ()
 
void ReleaseDataFlagOff ()
 
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...
 
int UpdateExtentIsEmpty (vtkInformation *pinfo, int extentType)
 
int * GetUpdateExtent ()
 These functions return the update extent for output ports that use 3D extents. More...
 
int * GetUpdateExtent (int port)
 
void GetUpdateExtent (int &x0, int &x1, int &y0, int &y1, int &z0, int &z1)
 
void GetUpdateExtent (int port, int &x0, int &x1, int &y0, int &y1, int &z0, int &z1)
 
void GetUpdateExtent (int extent[6])
 
void GetUpdateExtent (int port, int extent[6])
 
int GetUpdatePiece ()
 These functions return the update extent for output ports that use piece extents. More...
 
int GetUpdatePiece (int port)
 
int GetUpdateNumberOfPieces ()
 
int GetUpdateNumberOfPieces (int port)
 
int GetUpdateGhostLevel ()
 
int GetUpdateGhostLevel (int port)
 
void SetProgressObserver (vtkProgressObserver *)
 If an ProgressObserver is set, the algorithm will report progress through it rather than directly. More...
 
virtual vtkProgressObserverGetProgressObserver ()
 
- Public Member Functions inherited from vtkObject
 vtkBaseTypeMacro (vtkObject, vtkObjectBase)
 
virtual void DebugOn ()
 Turn debugging output on. More...
 
virtual void DebugOff ()
 Turn debugging output off. More...
 
bool GetDebug ()
 Get the value of the debug flag. More...
 
void SetDebug (bool debugFlag)
 Set the value of the debug flag. More...
 
virtual void Modified ()
 Update the modification time for this object. More...
 
virtual vtkMTimeType GetMTime ()
 Return this object's modified time. More...
 
unsigned long AddObserver (unsigned long event, vtkCommand *, float priority=0.0f)
 Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...
 
unsigned long AddObserver (const char *event, vtkCommand *, float priority=0.0f)
 
vtkCommandGetCommand (unsigned long tag)
 
void RemoveObserver (vtkCommand *)
 
void RemoveObservers (unsigned long event, vtkCommand *)
 
void RemoveObservers (const char *event, vtkCommand *)
 
vtkTypeBool HasObserver (unsigned long event, vtkCommand *)
 
vtkTypeBool HasObserver (const char *event, vtkCommand *)
 
void RemoveObserver (unsigned long tag)
 
void RemoveObservers (unsigned long event)
 
void RemoveObservers (const char *event)
 
void RemoveAllObservers ()
 
vtkTypeBool HasObserver (unsigned long event)
 
vtkTypeBool HasObserver (const char *event)
 
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...
 
template<class U , class T >
unsigned long AddObserver (unsigned long event, U observer, void(T::*callback)(vtkObject *, unsigned long, void *), float priority=0.0f)
 
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...
 
int InvokeEvent (unsigned long event, void *callData)
 This method invokes an event and return whether the event was aborted or not. More...
 
int InvokeEvent (const char *event, void *callData)
 
int InvokeEvent (unsigned long event)
 
int InvokeEvent (const char *event)
 
- Public Member Functions inherited from vtkObjectBase
const char * GetClassName () const
 Return the class name as a string. More...
 
virtual void Delete ()
 Delete a VTK object. More...
 
virtual void FastDelete ()
 Delete a reference to this object. More...
 
void InitializeObjectBase ()
 
void Print (ostream &os)
 Print an object to an ostream. More...
 
virtual void PrintHeader (ostream &os, vtkIndent indent)
 
virtual void PrintTrailer (ostream &os, vtkIndent indent)
 
int GetReferenceCount ()
 Return the current reference count of this object. More...
 
void SetReferenceCount (int)
 Sets the reference count. More...
 
void PrintRevisions (ostream &)
 Legacy. More...
 

Static Public Member Functions

static vtkTypeBool IsTypeOf (const char *type)
 
static vtkDecimateProSafeDownCast (vtkObjectBase *o)
 
static vtkDecimateProNew ()
 Create object with specified reduction of 90% and feature angle of 15 degrees. More...
 
- Static Public Member Functions inherited from vtkPolyDataAlgorithm
static vtkPolyDataAlgorithmNew ()
 
static vtkTypeBool IsTypeOf (const char *type)
 
static vtkPolyDataAlgorithmSafeDownCast (vtkObjectBase *o)
 
- Static Public Member Functions inherited from vtkAlgorithm
static vtkAlgorithmNew ()
 
static vtkTypeBool IsTypeOf (const char *type)
 
static vtkAlgorithmSafeDownCast (vtkObjectBase *o)
 
static vtkInformationIntegerKeyINPUT_IS_OPTIONAL ()
 Keys used to specify input port requirements. More...
 
static vtkInformationIntegerKeyINPUT_IS_REPEATABLE ()
 
static vtkInformationInformationVectorKeyINPUT_REQUIRED_FIELDS ()
 
static vtkInformationStringVectorKeyINPUT_REQUIRED_DATA_TYPE ()
 
static vtkInformationInformationVectorKeyINPUT_ARRAYS_TO_PROCESS ()
 
static vtkInformationIntegerKeyINPUT_PORT ()
 
static vtkInformationIntegerKeyINPUT_CONNECTION ()
 
static vtkInformationIntegerKeyCAN_PRODUCE_SUB_EXTENT ()
 This key tells the executive that a particular output port is capable of producing an arbitrary subextent of the whole extent. More...
 
static vtkInformationIntegerKeyCAN_HANDLE_PIECE_REQUEST ()
 Key that tells the pipeline that a particular algorithm can or cannot handle piece request. More...
 
static void SetDefaultExecutivePrototype (vtkExecutive *proto)
 If the DefaultExecutivePrototype is set, a copy of it is created in CreateDefaultExecutive() using NewInstance(). More...
 
- Static Public Member Functions inherited from vtkObject
static vtkObjectNew ()
 Create an object with Debug turned off, modified time initialized to zero, and reference counting on. More...
 
static void BreakOnError ()
 This method is called when vtkErrorMacro executes. More...
 
static void SetGlobalWarningDisplay (int val)
 This is a global flag that controls whether any debug, warning or error messages are displayed. More...
 
static void GlobalWarningDisplayOn ()
 
static void GlobalWarningDisplayOff ()
 
static int GetGlobalWarningDisplay ()
 
- Static Public Member Functions inherited from vtkObjectBase
static vtkTypeBool IsTypeOf (const char *name)
 Return 1 if this class type is the same type of (or a subclass of) the named class. More...
 
static vtkObjectBaseNew ()
 Create an object with Debug turned off, modified time initialized to zero, and reference counting on. More...
 

Protected Types

typedef LocalVertexLocalVertexPtr
 
typedef LocalTriLocalTriPtr
 

Protected Member Functions

virtual vtkObjectBaseNewInstanceInternal () const
 
 vtkDecimatePro ()
 
 ~vtkDecimatePro () override
 
int RequestData (vtkInformation *, vtkInformationVector **, vtkInformationVector *) override
 This is called by the superclass. More...
 
void SplitMesh ()
 
int EvaluateVertex (vtkIdType ptId, vtkIdType numTris, vtkIdType *tris, vtkIdType fedges[2])
 
vtkIdType FindSplit (int type, vtkIdType fedges[2], vtkIdType &pt1, vtkIdType &pt2, vtkIdList *CollapseTris)
 
int IsValidSplit (int index)
 
void SplitLoop (vtkIdType fedges[2], vtkIdType &n1, vtkIdType *l1, vtkIdType &n2, vtkIdType *l2)
 
void SplitVertex (vtkIdType ptId, int type, vtkIdType numTris, vtkIdType *tris, int insert)
 
int CollapseEdge (int type, vtkIdType ptId, vtkIdType collapseId, vtkIdType pt1, vtkIdType pt2, vtkIdList *CollapseTris)
 
void DistributeError (double error)
 
- Protected Member Functions inherited from vtkPolyDataAlgorithm
 vtkPolyDataAlgorithm ()
 
 ~vtkPolyDataAlgorithm () override
 
virtual int RequestInformation (vtkInformation *request, vtkInformationVector **inputVector, vtkInformationVector *outputVector)
 
virtual int RequestUpdateExtent (vtkInformation *, vtkInformationVector **, vtkInformationVector *)
 This is called by the superclass. More...
 
int FillOutputPortInformation (int port, vtkInformation *info) override
 Fill the output port information objects for this algorithm. More...
 
int FillInputPortInformation (int port, vtkInformation *info) override
 Fill the input port information objects for this algorithm. More...
 
- Protected Member Functions inherited from vtkAlgorithm
 vtkAlgorithm ()
 
 ~vtkAlgorithm () override
 
virtual void SetNumberOfInputPorts (int n)
 Set the number of input ports used by the algorithm. More...
 
virtual void SetNumberOfOutputPorts (int n)
 Set the number of output ports provided by the algorithm. More...
 
int InputPortIndexInRange (int index, const char *action)
 
int OutputPortIndexInRange (int index, const char *action)
 
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...
 
int GetInputArrayAssociation (int idx, int connection, vtkInformationVector **inputVector)
 Filters that have multiple connections on one port can use this signature. More...
 
int GetInputArrayAssociation (int idx, vtkDataObject *input)
 
vtkDataArrayGetInputArrayToProcess (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...
 
vtkDataArrayGetInputArrayToProcess (int idx, vtkInformationVector **inputVector, int &association)
 
vtkDataArrayGetInputArrayToProcess (int idx, int connection, vtkInformationVector **inputVector)
 Filters that have multiple connections on one port can use this signature. More...
 
vtkDataArrayGetInputArrayToProcess (int idx, int connection, vtkInformationVector **inputVector, int &association)
 
vtkDataArrayGetInputArrayToProcess (int idx, vtkDataObject *input)
 
vtkDataArrayGetInputArrayToProcess (int idx, vtkDataObject *input, int &association)
 
vtkAbstractArrayGetInputAbstractArrayToProcess (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...
 
vtkAbstractArrayGetInputAbstractArrayToProcess (int idx, vtkInformationVector **inputVector, int &association)
 
vtkAbstractArrayGetInputAbstractArrayToProcess (int idx, int connection, vtkInformationVector **inputVector)
 Filters that have multiple connections on one port can use this signature. More...
 
vtkAbstractArrayGetInputAbstractArrayToProcess (int idx, int connection, vtkInformationVector **inputVector, int &association)
 
vtkAbstractArrayGetInputAbstractArrayToProcess (int idx, vtkDataObject *input)
 
vtkAbstractArrayGetInputAbstractArrayToProcess (int idx, vtkDataObject *input, int &association)
 
vtkInformationGetInputArrayFieldInformation (int idx, vtkInformationVector **inputVector)
 This method takes in an index (as specified in SetInputArrayToProcess) and a pipeline information vector. More...
 
virtual vtkExecutiveCreateDefaultExecutive ()
 Create a default executive. More...
 
virtual void SetErrorCode (unsigned long)
 The error code contains a possible error that occurred while reading or writing the file. More...
 
void ReportReferences (vtkGarbageCollector *) override
 
virtual void SetNthInputConnection (int port, int index, vtkAlgorithmOutput *input)
 Replace the Nth connection on the given input port. More...
 
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...
 
void AddInputDataInternal (int port, vtkDataObject *input)
 
- Protected Member Functions inherited from vtkObject
 vtkObject ()
 
 ~vtkObject () override
 
void RegisterInternal (vtkObjectBase *, vtkTypeBool check) override
 
void UnRegisterInternal (vtkObjectBase *, vtkTypeBool check) override
 
void InternalGrabFocus (vtkCommand *mouseEvents, vtkCommand *keypressEvents=nullptr)
 These methods allow a command to exclusively grab all events. More...
 
void InternalReleaseFocus ()
 
- Protected Member Functions inherited from vtkObjectBase
 vtkObjectBase ()
 
virtual ~vtkObjectBase ()
 
virtual void CollectRevisions (ostream &)
 
 vtkObjectBase (const vtkObjectBase &)
 
void operator= (const vtkObjectBase &)
 

Protected Attributes

double TargetReduction
 
double FeatureAngle
 
double MaximumError
 
double AbsoluteError
 
int ErrorIsAbsolute
 
vtkTypeBool AccumulateError
 
double SplitAngle
 
vtkTypeBool Splitting
 
vtkTypeBool PreSplitMesh
 
vtkTypeBool BoundaryVertexDeletion
 
vtkTypeBool PreserveTopology
 
int Degree
 
double InflectionPointRatio
 
vtkDoubleArrayInflectionPoints
 
int OutputPointsPrecision
 
vtkIdListNeighbors
 
vtkPriorityQueueEdgeLengths
 
- Protected Attributes inherited from vtkAlgorithm
vtkInformationInformation
 
unsigned long ErrorCode
 
double Progress
 
char * ProgressText
 
vtkProgressObserverProgressObserver
 
- Protected Attributes inherited from vtkObject
bool Debug
 
vtkTimeStamp MTime
 
vtkSubjectHelper * SubjectHelper
 
- Protected Attributes inherited from vtkObjectBase
std::atomic< int32_t > ReferenceCount
 
vtkWeakPointerBase ** WeakPointers
 

Friends

class VertexArray
 
class TriArray
 

Additional Inherited Members

- Public Attributes inherited from vtkAlgorithm
vtkTypeBool AbortExecute
 
- Static Protected Member Functions inherited from vtkAlgorithm
static vtkInformationIntegerKeyPORT_REQUIREMENTS_FILLED ()
 
- Static Protected Attributes inherited from vtkAlgorithm
static vtkExecutiveDefaultExecutivePrototype
 

Detailed Description

reduce the number of triangles in a mesh

vtkDecimatePro is a filter to reduce the number of triangles in a triangle mesh, forming a good approximation to the original geometry. The input to vtkDecimatePro is a vtkPolyData object, and only triangles are treated. If you desire to decimate polygonal meshes, first triangulate the polygons with vtkTriangleFilter object.

The implementation of vtkDecimatePro is similar to the algorithm originally described in "Decimation of Triangle Meshes", Proc Siggraph `92, with three major differences. First, this algorithm does not necessarily preserve the topology of the mesh. Second, it is guaranteed to give the a mesh reduction factor specified by the user (as long as certain constraints are not set - see Caveats). Third, it is set up generate progressive meshes, that is a stream of operations that can be easily transmitted and incrementally updated (see Hugues Hoppe's Siggraph '96 paper on progressive meshes).

The algorithm proceeds as follows. Each vertex in the mesh is classified and inserted into a priority queue. The priority is based on the error to delete the vertex and retriangulate the hole. Vertices that cannot be deleted or triangulated (at this point in the algorithm) are skipped. Then, each vertex in the priority queue is processed (i.e., deleted followed by hole triangulation using edge collapse). This continues until the priority queue is empty. Next, all remaining vertices are processed, and the mesh is split into separate pieces along sharp edges or at non-manifold attachment points and reinserted into the priority queue. Again, the priority queue is processed until empty. If the desired reduction is still not achieved, the remaining vertices are split as necessary (in a recursive fashion) so that it is possible to eliminate every triangle as necessary.

To use this object, at a minimum you need to specify the ivar TargetReduction. The algorithm is guaranteed to generate a reduced mesh at this level as long as the following four conditions are met: 1) topology modification is allowed (i.e., the ivar PreserveTopology is off); 2) mesh splitting is enabled (i.e., the ivar Splitting is on); 3) the algorithm is allowed to modify the boundary of the mesh (i.e., the ivar BoundaryVertexDeletion is on); and 4) the maximum allowable error (i.e., the ivar MaximumError) is set to VTK_DOUBLE_MAX. Other important parameters to adjust include the FeatureAngle and SplitAngle ivars, since these can impact the quality of the final mesh. Also, you can set the ivar AccumulateError to force incremental error update and distribution to surrounding vertices as each vertex is deleted. The accumulated error is a conservative global error bounds and decimation error, but requires additional memory and time to compute.

Warning
To guarantee a given level of reduction, the ivar PreserveTopology must be off; the ivar Splitting is on; the ivar BoundaryVertexDeletion is on; and the ivar MaximumError is set to VTK_DOUBLE_MAX.
If PreserveTopology is off, and SplitEdges is off; the mesh topology may be modified by closing holes.
Once mesh splitting begins, the feature angle is set to the split angle.
See also
vtkDecimate vtkQuadricClustering vtkQuadricDecimation

Definition at line 91 of file vtkDecimatePro.h.

Member Typedef Documentation

◆ Superclass

Definition at line 94 of file vtkDecimatePro.h.

◆ LocalVertexPtr

Definition at line 336 of file vtkDecimatePro.h.

◆ LocalTriPtr

Definition at line 346 of file vtkDecimatePro.h.

Constructor & Destructor Documentation

◆ vtkDecimatePro()

vtkDecimatePro::vtkDecimatePro ( )
protected

◆ ~vtkDecimatePro()

vtkDecimatePro::~vtkDecimatePro ( )
overrideprotected

Member Function Documentation

◆ IsTypeOf()

static vtkTypeBool vtkDecimatePro::IsTypeOf ( const char *  type)
static

◆ IsA()

virtual vtkTypeBool vtkDecimatePro::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.

◆ SafeDownCast()

static vtkDecimatePro* vtkDecimatePro::SafeDownCast ( vtkObjectBase o)
static

◆ NewInstanceInternal()

virtual vtkObjectBase* vtkDecimatePro::NewInstanceInternal ( ) const
protectedvirtual

Reimplemented from vtkPolyDataAlgorithm.

◆ NewInstance()

vtkDecimatePro* vtkDecimatePro::NewInstance ( ) const

◆ PrintSelf()

void vtkDecimatePro::PrintSelf ( ostream &  os,
vtkIndent  indent 
)
overridevirtual

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.

◆ New()

static vtkDecimatePro* vtkDecimatePro::New ( )
static

Create object with specified reduction of 90% and feature angle of 15 degrees.

Edge splitting is on, defer splitting is on, and the split angle is 75 degrees. Topology preservation is off, delete boundary vertices is on, and the maximum error is set to VTK_DOUBLE_MAX. The inflection point ratio is 10 and the vertex degree is 25. Error accumulation is turned off.

◆ SetTargetReduction()

virtual void vtkDecimatePro::SetTargetReduction ( double  )
virtual

Specify the desired reduction in the total number of polygons (e.g., if TargetReduction is set to 0.9, this filter will try to reduce the data set to 10% of its original size).

Because of various constraints, this level of reduction may not be realized. If you want to guarantee a particular reduction, you must turn off PreserveTopology, turn on SplitEdges and BoundaryVertexDeletion, and set the MaximumError to VTK_DOUBLE_MAX (these ivars are initialized this way when the object is instantiated).

◆ GetTargetReduction()

virtual double vtkDecimatePro::GetTargetReduction ( )
virtual

◆ SetPreserveTopology()

virtual void vtkDecimatePro::SetPreserveTopology ( vtkTypeBool  )
virtual

Turn on/off whether to preserve the topology of the original mesh.

If on, mesh splitting and hole elimination will not occur. This may limit the maximum reduction that may be achieved.

◆ GetPreserveTopology()

virtual vtkTypeBool vtkDecimatePro::GetPreserveTopology ( )
virtual

◆ PreserveTopologyOn()

virtual void vtkDecimatePro::PreserveTopologyOn ( )
virtual

◆ PreserveTopologyOff()

virtual void vtkDecimatePro::PreserveTopologyOff ( )
virtual

◆ SetFeatureAngle()

virtual void vtkDecimatePro::SetFeatureAngle ( double  )
virtual

Specify the mesh feature angle.

This angle is used to define what an edge is (i.e., if the surface normal between two adjacent triangles is >= FeatureAngle, an edge exists).

◆ GetFeatureAngle()

virtual double vtkDecimatePro::GetFeatureAngle ( )
virtual

◆ SetSplitting()

virtual void vtkDecimatePro::SetSplitting ( vtkTypeBool  )
virtual

Turn on/off the splitting of the mesh at corners, along edges, at non-manifold points, or anywhere else a split is required.

Turning splitting off will better preserve the original topology of the mesh, but you may not obtain the requested reduction.

◆ GetSplitting()

virtual vtkTypeBool vtkDecimatePro::GetSplitting ( )
virtual

◆ SplittingOn()

virtual void vtkDecimatePro::SplittingOn ( )
virtual

◆ SplittingOff()

virtual void vtkDecimatePro::SplittingOff ( )
virtual

◆ SetSplitAngle()

virtual void vtkDecimatePro::SetSplitAngle ( double  )
virtual

Specify the mesh split angle.

This angle is used to control the splitting of the mesh. A split line exists when the surface normals between two edge connected triangles are >= SplitAngle.

◆ GetSplitAngle()

virtual double vtkDecimatePro::GetSplitAngle ( )
virtual

◆ SetPreSplitMesh()

virtual void vtkDecimatePro::SetPreSplitMesh ( vtkTypeBool  )
virtual

In some cases you may wish to split the mesh prior to algorithm execution.

This separates the mesh into semi-planar patches, which are disconnected from each other. This can give superior results in some cases. If the ivar PreSplitMesh ivar is enabled, the mesh is split with the specified SplitAngle. Otherwise mesh splitting is deferred as long as possible.

◆ GetPreSplitMesh()

virtual vtkTypeBool vtkDecimatePro::GetPreSplitMesh ( )
virtual

◆ PreSplitMeshOn()

virtual void vtkDecimatePro::PreSplitMeshOn ( )
virtual

◆ PreSplitMeshOff()

virtual void vtkDecimatePro::PreSplitMeshOff ( )
virtual

◆ SetMaximumError()

virtual void vtkDecimatePro::SetMaximumError ( double  )
virtual

Set the largest decimation error that is allowed during the decimation process.

This may limit the maximum reduction that may be achieved. The maximum error is specified as a fraction of the maximum length of the input data bounding box.

◆ GetMaximumError()

virtual double vtkDecimatePro::GetMaximumError ( )
virtual

◆ SetAccumulateError()

virtual void vtkDecimatePro::SetAccumulateError ( vtkTypeBool  )
virtual

The computed error can either be computed directly from the mesh or the error may be accumulated as the mesh is modified.

If the error is accumulated, then it represents a global error bounds, and the ivar MaximumError becomes a global bounds on mesh error. Accumulating the error requires extra memory proportional to the number of vertices in the mesh. If AccumulateError is off, then the error is not accumulated.

◆ GetAccumulateError()

virtual vtkTypeBool vtkDecimatePro::GetAccumulateError ( )
virtual

◆ AccumulateErrorOn()

virtual void vtkDecimatePro::AccumulateErrorOn ( )
virtual

◆ AccumulateErrorOff()

virtual void vtkDecimatePro::AccumulateErrorOff ( )
virtual

◆ SetErrorIsAbsolute()

virtual void vtkDecimatePro::SetErrorIsAbsolute ( int  )
virtual

The MaximumError is normally defined as a fraction of the dataset bounding diagonal.

By setting ErrorIsAbsolute to 1, the error is instead defined as that specified by AbsoluteError. By default ErrorIsAbsolute=0.

◆ GetErrorIsAbsolute()

virtual int vtkDecimatePro::GetErrorIsAbsolute ( )
virtual

◆ SetAbsoluteError()

virtual void vtkDecimatePro::SetAbsoluteError ( double  )
virtual

Same as MaximumError, but to be used when ErrorIsAbsolute is 1.

◆ GetAbsoluteError()

virtual double vtkDecimatePro::GetAbsoluteError ( )
virtual

◆ SetBoundaryVertexDeletion()

virtual void vtkDecimatePro::SetBoundaryVertexDeletion ( vtkTypeBool  )
virtual

Turn on/off the deletion of vertices on the boundary of a mesh.

This may limit the maximum reduction that may be achieved.

◆ GetBoundaryVertexDeletion()

virtual vtkTypeBool vtkDecimatePro::GetBoundaryVertexDeletion ( )
virtual

◆ BoundaryVertexDeletionOn()

virtual void vtkDecimatePro::BoundaryVertexDeletionOn ( )
virtual

◆ BoundaryVertexDeletionOff()

virtual void vtkDecimatePro::BoundaryVertexDeletionOff ( )
virtual

◆ SetDegree()

virtual void vtkDecimatePro::SetDegree ( int  )
virtual

If the number of triangles connected to a vertex exceeds "Degree", then the vertex will be split.

(NOTE: the complexity of the triangulation algorithm is proportional to Degree^2. Setting degree small can improve the performance of the algorithm.)

◆ GetDegree()

virtual int vtkDecimatePro::GetDegree ( )
virtual

◆ SetInflectionPointRatio()

virtual void vtkDecimatePro::SetInflectionPointRatio ( double  )
virtual

Specify the inflection point ratio.

An inflection point occurs when the ratio of reduction error between two iterations is greater than or equal to the InflectionPointRatio.

◆ GetInflectionPointRatio()

virtual double vtkDecimatePro::GetInflectionPointRatio ( )
virtual

◆ GetNumberOfInflectionPoints()

vtkIdType vtkDecimatePro::GetNumberOfInflectionPoints ( )

Get the number of inflection points.

Only returns a valid value after the filter has executed. The values in the list are mesh reduction values at each inflection point. Note: the first inflection point always occurs right before non-planar triangles are decimated (i.e., as the error becomes non-zero).

◆ GetInflectionPoints() [1/2]

void vtkDecimatePro::GetInflectionPoints ( double *  inflectionPoints)

Get a list of inflection points.

These are double values 0 < r <= 1.0 corresponding to reduction level, and there are a total of NumberOfInflectionPoints() values. You must provide an array (of the correct size) into which the inflection points are written.

◆ GetInflectionPoints() [2/2]

double* vtkDecimatePro::GetInflectionPoints ( )

Get a list of inflection points.

These are double values 0 < r <= 1.0 corresponding to reduction level, and there are a total of NumberOfInflectionPoints() values. You must provide an array (of the correct size) into which the inflection points are written. This method returns a pointer to a list of inflection points.

◆ SetOutputPointsPrecision()

virtual void vtkDecimatePro::SetOutputPointsPrecision ( int  )
virtual

Set/get the desired precision for the output types.

See the documentation for the vtkAlgorithm::DesiredOutputPrecision enum for an explanation of the available precision settings.

◆ GetOutputPointsPrecision()

virtual int vtkDecimatePro::GetOutputPointsPrecision ( )
virtual

◆ RequestData()

int vtkDecimatePro::RequestData ( vtkInformation request,
vtkInformationVector **  inputVector,
vtkInformationVector outputVector 
)
overrideprotectedvirtual

This is called by the superclass.

This is the method you should override.

Reimplemented from vtkPolyDataAlgorithm.

◆ SplitMesh()

void vtkDecimatePro::SplitMesh ( )
protected

◆ EvaluateVertex()

int vtkDecimatePro::EvaluateVertex ( vtkIdType  ptId,
vtkIdType  numTris,
vtkIdType tris,
vtkIdType  fedges[2] 
)
protected

◆ FindSplit()

vtkIdType vtkDecimatePro::FindSplit ( int  type,
vtkIdType  fedges[2],
vtkIdType pt1,
vtkIdType pt2,
vtkIdList CollapseTris 
)
protected

◆ IsValidSplit()

int vtkDecimatePro::IsValidSplit ( int  index)
protected

◆ SplitLoop()

void vtkDecimatePro::SplitLoop ( vtkIdType  fedges[2],
vtkIdType n1,
vtkIdType l1,
vtkIdType n2,
vtkIdType l2 
)
protected

◆ SplitVertex()

void vtkDecimatePro::SplitVertex ( vtkIdType  ptId,
int  type,
vtkIdType  numTris,
vtkIdType tris,
int  insert 
)
protected

◆ CollapseEdge()

int vtkDecimatePro::CollapseEdge ( int  type,
vtkIdType  ptId,
vtkIdType  collapseId,
vtkIdType  pt1,
vtkIdType  pt2,
vtkIdList CollapseTris 
)
protected

◆ DistributeError()

void vtkDecimatePro::DistributeError ( double  error)
protected

Friends And Related Function Documentation

◆ VertexArray

friend class VertexArray
friend

Definition at line 348 of file vtkDecimatePro.h.

◆ TriArray

friend class TriArray
friend

Definition at line 372 of file vtkDecimatePro.h.

Member Data Documentation

◆ TargetReduction

double vtkDecimatePro::TargetReduction
protected

Definition at line 294 of file vtkDecimatePro.h.

◆ FeatureAngle

double vtkDecimatePro::FeatureAngle
protected

Definition at line 295 of file vtkDecimatePro.h.

◆ MaximumError

double vtkDecimatePro::MaximumError
protected

Definition at line 296 of file vtkDecimatePro.h.

◆ AbsoluteError

double vtkDecimatePro::AbsoluteError
protected

Definition at line 297 of file vtkDecimatePro.h.

◆ ErrorIsAbsolute

int vtkDecimatePro::ErrorIsAbsolute
protected

Definition at line 298 of file vtkDecimatePro.h.

◆ AccumulateError

vtkTypeBool vtkDecimatePro::AccumulateError
protected

Definition at line 299 of file vtkDecimatePro.h.

◆ SplitAngle

double vtkDecimatePro::SplitAngle
protected

Definition at line 300 of file vtkDecimatePro.h.

◆ Splitting

vtkTypeBool vtkDecimatePro::Splitting
protected

Definition at line 301 of file vtkDecimatePro.h.

◆ PreSplitMesh

vtkTypeBool vtkDecimatePro::PreSplitMesh
protected

Definition at line 302 of file vtkDecimatePro.h.

◆ BoundaryVertexDeletion

vtkTypeBool vtkDecimatePro::BoundaryVertexDeletion
protected

Definition at line 303 of file vtkDecimatePro.h.

◆ PreserveTopology

vtkTypeBool vtkDecimatePro::PreserveTopology
protected

Definition at line 304 of file vtkDecimatePro.h.

◆ Degree

int vtkDecimatePro::Degree
protected

Definition at line 305 of file vtkDecimatePro.h.

◆ InflectionPointRatio

double vtkDecimatePro::InflectionPointRatio
protected

Definition at line 306 of file vtkDecimatePro.h.

◆ InflectionPoints

vtkDoubleArray* vtkDecimatePro::InflectionPoints
protected

Definition at line 307 of file vtkDecimatePro.h.

◆ OutputPointsPrecision

int vtkDecimatePro::OutputPointsPrecision
protected

Definition at line 308 of file vtkDecimatePro.h.

◆ Neighbors

vtkIdList* vtkDecimatePro::Neighbors
protected

Definition at line 311 of file vtkDecimatePro.h.

◆ EdgeLengths

vtkPriorityQueue* vtkDecimatePro::EdgeLengths
protected

Definition at line 312 of file vtkDecimatePro.h.


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