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vtkExtractSurface Class Reference

generate zero-crossing isosurface from truncated signed distance volume More...

#include <vtkExtractSurface.h>

Inheritance diagram for vtkExtractSurface:
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Collaboration diagram for vtkExtractSurface:
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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...
 
vtkExtractSurfaceNewInstance () const
 
void PrintSelf (ostream &os, vtkIndent indent) override
 Methods invoked by print to print information about the object including superclasses. More...
 
virtual void SetRadius (double)
 Specify the radius of influence of the signed distance function. More...
 
virtual double GetRadius ()
 
virtual void SetHoleFilling (bool)
 Enable hole filling. More...
 
virtual bool GetHoleFilling ()
 
virtual void HoleFillingOn ()
 
virtual void HoleFillingOff ()
 
virtual void SetComputeNormals (vtkTypeBool)
 Set/Get the computation of normals. More...
 
virtual vtkTypeBool GetComputeNormals ()
 
virtual void ComputeNormalsOn ()
 
virtual void ComputeNormalsOff ()
 
virtual void SetComputeGradients (vtkTypeBool)
 Set/Get the computation of gradients. More...
 
virtual vtkTypeBool GetComputeGradients ()
 
virtual void ComputeGradientsOn ()
 
virtual void ComputeGradientsOff ()
 
- 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 vtkExtractSurfaceNew ()
 Standard methods for instantiating the class, providing type information, and printing. More...
 
static vtkTypeBool IsTypeOf (const char *type)
 
static vtkExtractSurfaceSafeDownCast (vtkObjectBase *o)
 
- 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 Member Functions

virtual vtkObjectBaseNewInstanceInternal () const
 
 vtkExtractSurface ()
 
 ~vtkExtractSurface () override
 
int RequestData (vtkInformation *, vtkInformationVector **, vtkInformationVector *) override
 This is called by the superclass. More...
 
int RequestUpdateExtent (vtkInformation *, vtkInformationVector **, vtkInformationVector *) override
 This is called by the superclass. More...
 
int FillInputPortInformation (int port, vtkInformation *info) override
 Fill the input port information objects for this algorithm. More...
 
- Protected Member Functions inherited from vtkPolyDataAlgorithm
 vtkPolyDataAlgorithm ()
 
 ~vtkPolyDataAlgorithm () override
 
virtual int RequestInformation (vtkInformation *request, vtkInformationVector **inputVector, vtkInformationVector *outputVector)
 
int FillOutputPortInformation (int port, vtkInformation *info) override
 Fill the output 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 Radius
 
bool HoleFilling
 
vtkTypeBool ComputeNormals
 
vtkTypeBool ComputeGradients
 
- 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
 

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

generate zero-crossing isosurface from truncated signed distance volume

This filter extracts the zero-crossing isosurface from a truncated signed distance function TSDF. The TSDF is sampled across a volume, and is extracted using a modified version of the Flying Edges (FE) algorithm for increased speed, and to support multithreading. To use the filter, an input volume should be assigned, which may have special values indicating empty and/or unseen portions of the volume. These values are equal to +/- radius value of the signed distance function, and should be consistent with any filters used to generate the input volume (e.g., vtkSignedDistance).

The Flying Edges algorithm is modified to deal with the nature of the truncated, signed distance function. Being truncated, the distance function typically is not computed throughout the volume, rather the special data values "unseen" and/or "empty" maybe assigned to distant or bordering voxels. The implications of this are that this implementation may produce non-closed, non-manifold surfaces, which is what is required to extract surfaces.

More specifically, voxels may exist in one of three states: 1) within the TSDF, which extends +/-Radius from a generating geometry (typically a point cloud); 2) in the empty state, in which it is known that the surface does not exist; and 3) the unseen state, where a surface may exist but not enough information is known to be certain. Such situations arise, for example, when laser scanners generate point clouds, and the propagation of the laser beam "carves" out regions where no geometry exists (thereby defining empty space). Furthermore, areas in which the beam are occluded by geometry are known as "unseen" and the boundary between empty and unseen can be processed to produced a portion of the output isosurface (this is called hole filling).

Warning
This class has been threaded with vtkSMPTools. Using TBB or other non-sequential type (set in the CMake variable VTK_SMP_IMPLEMENTATION_TYPE) may improve performance significantly.
Empty regions are expected to have a data value -(this->Radius+FLT_EPSILON). Unseen regions are expected to have a data value (this->Radius+FLT_EPSILON). Near regions have data values d such that: -(this->Radius+FLT_EPSILON) < d (this->Radius+FLT_EPSILON).
  Notes on the implementation:
  1. This is a lightly modified version of vtkFlyingEdges3D. Some design goals
     included minimizing the impact on the FE algorithm, and not adding extra
     memory requirements.
  2. It presumes an isocontour value=0.0 (the zero crossing of a signed
     distance function).
  3. The major modifications are to the edge cases. In Flying Edges, a single
     byte represents the case of an edge, and within that byte only 2 bits
     are needed (the extra six bytes are not used). Here, these unused bytes
     are repurposed to represent the "state" of the edge, whether it is
     1) near to the TSDF; 2) in an empty state; or 3) unseen state.
  4. Since these now-used bits encode extra state information, masking and
     related methods are modified from FE to tease apart the edge cases from
     the edge state.
  5. Voxels with edges marked "empty" are not processed, i.e., no output
     triangle primitives are generated. Depending on whether hole filling is
     enabled, voxels with edges marked "unseen" may not be processed either.
  6. As a result of #1 and #5, and the desire to keep the implementation simple,
     it is possible to produce output points which are not used by any output
     triangle.
*
This algorithm loosely follows the most excellent paper by Curless and Levoy: "A Volumetric Method for Building Complex Models from Range Images."
This algorithm differs from the paper cited above in an important way. The Curless & Levoy algorithm is designed to create watertight surfaces, while this modified algorithm may not do so as the generating surface is not assumed to be closed.
See also
vtkSignedDistance vtkFlyingEdges3D

Definition at line 110 of file vtkExtractSurface.h.

Member Typedef Documentation

◆ Superclass

Definition at line 119 of file vtkExtractSurface.h.

Constructor & Destructor Documentation

◆ vtkExtractSurface()

vtkExtractSurface::vtkExtractSurface ( )
protected

◆ ~vtkExtractSurface()

vtkExtractSurface::~vtkExtractSurface ( )
overrideprotected

Member Function Documentation

◆ New()

static vtkExtractSurface* vtkExtractSurface::New ( )
static

Standard methods for instantiating the class, providing type information, and printing.

◆ IsTypeOf()

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

◆ IsA()

virtual vtkTypeBool vtkExtractSurface::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 vtkExtractSurface* vtkExtractSurface::SafeDownCast ( vtkObjectBase o)
static

◆ NewInstanceInternal()

virtual vtkObjectBase* vtkExtractSurface::NewInstanceInternal ( ) const
protectedvirtual

Reimplemented from vtkPolyDataAlgorithm.

◆ NewInstance()

vtkExtractSurface* vtkExtractSurface::NewInstance ( ) const

◆ PrintSelf()

void vtkExtractSurface::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.

◆ SetRadius()

virtual void vtkExtractSurface::SetRadius ( double  )
virtual

Specify the radius of influence of the signed distance function.

Data values (which are distances) that are greater than the radius (i.e., d > Radius) are considered empty voxels; those voxel data values d < -Radius are considered unseen voxels.

◆ GetRadius()

virtual double vtkExtractSurface::GetRadius ( )
virtual

◆ SetHoleFilling()

virtual void vtkExtractSurface::SetHoleFilling ( bool  )
virtual

Enable hole filling.

This generates separating surfaces between the empty and unseen portions of the volume.

◆ GetHoleFilling()

virtual bool vtkExtractSurface::GetHoleFilling ( )
virtual

◆ HoleFillingOn()

virtual void vtkExtractSurface::HoleFillingOn ( )
virtual

◆ HoleFillingOff()

virtual void vtkExtractSurface::HoleFillingOff ( )
virtual

◆ SetComputeNormals()

virtual void vtkExtractSurface::SetComputeNormals ( vtkTypeBool  )
virtual

Set/Get the computation of normals.

Normal computation is fairly expensive in both time and storage. If the output data will be processed by filters that modify topology or geometry, it may be wise to turn Normals and Gradients off.

◆ GetComputeNormals()

virtual vtkTypeBool vtkExtractSurface::GetComputeNormals ( )
virtual

◆ ComputeNormalsOn()

virtual void vtkExtractSurface::ComputeNormalsOn ( )
virtual

◆ ComputeNormalsOff()

virtual void vtkExtractSurface::ComputeNormalsOff ( )
virtual

◆ SetComputeGradients()

virtual void vtkExtractSurface::SetComputeGradients ( vtkTypeBool  )
virtual

Set/Get the computation of gradients.

Gradient computation is fairly expensive in both time and storage. Note that if ComputeNormals is on, gradients will have to be calculated, but will not be stored in the output dataset. If the output data will be processed by filters that modify topology or geometry, it may be wise to turn Normals and Gradients off.

◆ GetComputeGradients()

virtual vtkTypeBool vtkExtractSurface::GetComputeGradients ( )
virtual

◆ ComputeGradientsOn()

virtual void vtkExtractSurface::ComputeGradientsOn ( )
virtual

◆ ComputeGradientsOff()

virtual void vtkExtractSurface::ComputeGradientsOff ( )
virtual

◆ RequestData()

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

This is called by the superclass.

This is the method you should override.

Reimplemented from vtkPolyDataAlgorithm.

◆ RequestUpdateExtent()

int vtkExtractSurface::RequestUpdateExtent ( vtkInformation ,
vtkInformationVector **  ,
vtkInformationVector  
)
overrideprotectedvirtual

This is called by the superclass.

This is the method you should override.

Reimplemented from vtkPolyDataAlgorithm.

◆ FillInputPortInformation()

int vtkExtractSurface::FillInputPortInformation ( int  port,
vtkInformation info 
)
overrideprotectedvirtual

Fill the input port information objects for this algorithm.

This is invoked by the first call to GetInputPortInformation for each port so subclasses can specify what they can handle.

Reimplemented from vtkPolyDataAlgorithm.

Member Data Documentation

◆ Radius

double vtkExtractSurface::Radius
protected

Definition at line 174 of file vtkExtractSurface.h.

◆ HoleFilling

bool vtkExtractSurface::HoleFilling
protected

Definition at line 175 of file vtkExtractSurface.h.

◆ ComputeNormals

vtkTypeBool vtkExtractSurface::ComputeNormals
protected

Definition at line 176 of file vtkExtractSurface.h.

◆ ComputeGradients

vtkTypeBool vtkExtractSurface::ComputeGradients
protected

Definition at line 177 of file vtkExtractSurface.h.


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