Hardware-Assisted Visibility Sorting unstructured grid mapper, OpenGL implementation. More...

#include <vtkOpenGLHAVSVolumeMapper.h>

Inheritance diagram for vtkOpenGLHAVSVolumeMapper:

Collaboration diagram for vtkOpenGLHAVSVolumeMapper:

Public Types
typedef vtkHAVSVolumeMapper	Superclass

Public Types inherited from vtkHAVSVolumeMapper
typedef vtkUnstructuredGridVolumeMapper	Superclass

Public Types inherited from vtkUnstructuredGridVolumeMapper
enum	{ COMPOSITE_BLEND, MAXIMUM_INTENSITY_BLEND }

typedef vtkAbstractVolumeMapper	Superclass

Public Types inherited from vtkAbstractVolumeMapper
typedef vtkAbstractMapper3D	Superclass

Public Types inherited from vtkAbstractMapper3D
typedef vtkAbstractMapper	Superclass

Public Types inherited from vtkAbstractMapper
typedef vtkAlgorithm	Superclass

Public Types inherited from vtkAlgorithm
typedef vtkObject	Superclass

enum	DesiredOutputPrecision { SINGLE_PRECISION, DOUBLE_PRECISION, DEFAULT_PRECISION }

Public Types inherited from vtkObject
typedef vtkObjectBase	Superclass

Public Member Functions
virtual int	IsA (const char *type)

vtkOpenGLHAVSVolumeMapper *	NewInstance () const

virtual void	PrintSelf (ostream &os, vtkIndent indent)

virtual void	Render (vtkRenderer ren, vtkVolume vol)

virtual void	ReleaseGraphicsResources (vtkWindow *)

virtual void	SetGPUDataStructures (bool)


virtual bool	SupportedByHardware (vtkRenderer *r)

Public Member Functions inherited from vtkHAVSVolumeMapper
vtkHAVSVolumeMapper *	NewInstance () const

virtual void	SetPartiallyRemoveNonConvexities (bool)

virtual bool	GetPartiallyRemoveNonConvexities ()

virtual void	SetLevelOfDetailTargetTime (float)

virtual float	GetLevelOfDetailTargetTime ()

virtual void	SetLevelOfDetail (bool)

virtual bool	GetLevelOfDetail ()

void	SetLevelOfDetailMethod (int)

virtual int	GetLevelOfDetailMethod ()

void	SetLevelOfDetailMethodField ()

void	SetLevelOfDetailMethodArea ()

virtual void	SetKBufferSize (int)

virtual int	GetKBufferSize ()

void	SetKBufferSizeTo2 ()

void	SetKBufferSizeTo6 ()

virtual bool	SupportedByHardware (vtkRenderer *vtkNotUsed(r))

virtual bool	GetGPUDataStructures ()

Public Member Functions inherited from vtkUnstructuredGridVolumeMapper
vtkUnstructuredGridVolumeMapper *	NewInstance () const

virtual void	SetBlendMode (int)

void	SetBlendModeToComposite ()

void	SetBlendModeToMaximumIntensity ()

virtual int	GetBlendMode ()

virtual void	SetInputData (vtkUnstructuredGridBase *)

virtual void	SetInputData (vtkDataSet *)

vtkUnstructuredGridBase *	GetInput ()

Public Member Functions inherited from vtkAbstractVolumeMapper
vtkAbstractVolumeMapper *	NewInstance () const

const char *	GetScalarModeAsString ()

vtkDataSet *	GetDataSetInput ()

vtkDataObject *	GetDataObjectInput ()

virtual double *	GetBounds ()

virtual void	GetBounds (double bounds[6])

virtual void	SetScalarMode (int)

virtual int	GetScalarMode ()

void	SetScalarModeToDefault ()

void	SetScalarModeToUsePointData ()

void	SetScalarModeToUseCellData ()

void	SetScalarModeToUsePointFieldData ()

void	SetScalarModeToUseCellFieldData ()

virtual void	SelectScalarArray (int arrayNum)

virtual void	SelectScalarArray (const char *arrayName)

virtual char *	GetArrayName ()

virtual int	GetArrayId ()

virtual int	GetArrayAccessMode ()

virtual float	GetGradientMagnitudeScale ()

virtual float	GetGradientMagnitudeBias ()

virtual float	GetGradientMagnitudeScale (int)

virtual float	GetGradientMagnitudeBias (int)

Public Member Functions inherited from vtkAbstractMapper3D
vtkAbstractMapper3D *	NewInstance () const

double	GetLength ()

int	GetNumberOfClippingPlanes ()

double *	GetCenter ()

void	GetCenter (double center[3])

virtual int	IsARayCastMapper ()

virtual int	IsARenderIntoImageMapper ()

void	GetClippingPlaneInDataCoords (vtkMatrix4x4 *propMatrix, int i, double planeEquation[4])

Public Member Functions inherited from vtkAbstractMapper
vtkAbstractMapper *	NewInstance () const

virtual unsigned long	GetMTime ()

void	SetClippingPlanes (vtkPlanes *planes)

void	ShallowCopy (vtkAbstractMapper *m)

virtual double	GetTimeToDraw ()

void	AddClippingPlane (vtkPlane *plane)

void	RemoveClippingPlane (vtkPlane *plane)

void	RemoveAllClippingPlanes ()

virtual void	SetClippingPlanes (vtkPlaneCollection *)

virtual vtkPlaneCollection *	GetClippingPlanes ()

Public Member Functions inherited from vtkAlgorithm
vtkAlgorithm *	NewInstance () const

int	HasExecutive ()

vtkExecutive *	GetExecutive ()

virtual void	SetExecutive (vtkExecutive *executive)

virtual int	ModifyRequest (vtkInformation *request, int when)

vtkInformation *	GetInputPortInformation (int port)

vtkInformation *	GetOutputPortInformation (int port)

int	GetNumberOfInputPorts ()

int	GetNumberOfOutputPorts ()

void	UpdateProgress (double amount)

vtkInformation *	GetInputArrayInformation (int idx)

void	RemoveAllInputs ()

vtkDataObject *	GetOutputDataObject (int port)

virtual void	RemoveInputConnection (int port, vtkAlgorithmOutput *input)

virtual void	RemoveInputConnection (int port, int idx)

virtual void	RemoveAllInputConnections (int port)

int	GetNumberOfInputConnections (int port)

int	GetTotalNumberOfInputConnections ()

vtkAlgorithmOutput *	GetInputConnection (int port, int index)

vtkAlgorithm *	GetInputAlgorithm (int port, int index, int &algPort)

vtkAlgorithm *	GetInputAlgorithm (int port, int index)

vtkExecutive *	GetInputExecutive (int port, int index)

vtkInformation *	GetInputInformation (int port, int index)

vtkInformation *	GetOutputInformation (int port)

virtual void	UpdateInformation ()

virtual void	UpdateDataObject ()

virtual void	PropagateUpdateExtent ()

virtual void	UpdateWholeExtent ()

void	ConvertTotalInputToPortConnection (int ind, int &port, int &conn)

int	SetUpdateExtentToWholeExtent (int port)

int	SetUpdateExtentToWholeExtent ()

void	SetUpdateExtent (int port, int extent[6])

virtual int	ProcessRequest (vtkInformation request, vtkInformationVector inInfo, vtkInformationVector outInfo)

int	ProcessRequest (vtkInformation request, vtkCollection inInfo, vtkInformationVector *outInfo)

virtual int	ComputePipelineMTime (vtkInformation request, vtkInformationVector inInfoVec, vtkInformationVector outInfoVec, int requestFromOutputPort, unsigned long *mtime)

virtual vtkInformation *	GetInformation ()

virtual void	SetInformation (vtkInformation *)

virtual void	Register (vtkObjectBase *o)

virtual void	UnRegister (vtkObjectBase *o)

virtual void	SetAbortExecute (int)

virtual int	GetAbortExecute ()

virtual void	AbortExecuteOn ()

virtual void	AbortExecuteOff ()

virtual void	SetProgress (double)

virtual double	GetProgress ()

void	SetProgressText (const char *ptext)

virtual char *	GetProgressText ()

virtual unsigned long	GetErrorCode ()

virtual void	SetInputArrayToProcess (int idx, int port, int connection, int fieldAssociation, const char *name)

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)

vtkDataObject *	GetInputDataObject (int port, int connection)

virtual void	SetInputConnection (int port, vtkAlgorithmOutput *input)

virtual void	SetInputConnection (vtkAlgorithmOutput *input)

virtual void	AddInputConnection (int port, vtkAlgorithmOutput *input)

virtual void	AddInputConnection (vtkAlgorithmOutput *input)

virtual void	SetInputDataObject (int port, vtkDataObject *data)

virtual void	SetInputDataObject (vtkDataObject *data)

virtual void	AddInputDataObject (int port, vtkDataObject *data)

virtual void	AddInputDataObject (vtkDataObject *data)

vtkAlgorithmOutput *	GetOutputPort (int index)

vtkAlgorithmOutput *	GetOutputPort ()

vtkAlgorithm *	GetInputAlgorithm ()

vtkExecutive *	GetInputExecutive ()

vtkInformation *	GetInputInformation ()

virtual void	Update (int port)

virtual void	Update ()

virtual void	SetReleaseDataFlag (int)

virtual int	GetReleaseDataFlag ()

void	ReleaseDataFlagOn ()

void	ReleaseDataFlagOff ()

int	UpdateExtentIsEmpty (vtkInformation pinfo, vtkDataObject output)

int	UpdateExtentIsEmpty (vtkInformation *pinfo, int extentType)

void	SetUpdateExtent (int port, int piece, int numPieces, int ghostLevel)

void	SetUpdateExtent (int piece, int numPieces, int ghostLevel)

void	SetUpdateExtent (int extent[6])

int *	GetUpdateExtent ()

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 ()

int	GetUpdatePiece (int port)

int	GetUpdateNumberOfPieces ()

int	GetUpdateNumberOfPieces (int port)

int	GetUpdateGhostLevel ()

int	GetUpdateGhostLevel (int port)

void	SetProgressObserver (vtkProgressObserver *)

virtual vtkProgressObserver *	GetProgressObserver ()

Public Member Functions inherited from vtkObject
vtkObject *	NewInstance () const

virtual void	DebugOn ()

virtual void	DebugOff ()

bool	GetDebug ()

void	SetDebug (bool debugFlag)

virtual void	Modified ()

unsigned long	AddObserver (unsigned long event, vtkCommand *, float priority=0.0f)

unsigned long	AddObserver (const char event, vtkCommand , float priority=0.0f)

vtkCommand *	GetCommand (unsigned long tag)

void	RemoveObserver (vtkCommand *)

void	RemoveObservers (unsigned long event, vtkCommand *)

void	RemoveObservers (const char event, vtkCommand )

int	HasObserver (unsigned long event, vtkCommand *)

int	HasObserver (const char event, vtkCommand )

void	RemoveObserver (unsigned long tag)

void	RemoveObservers (unsigned long event)

void	RemoveObservers (const char *event)

void	RemoveAllObservers ()

int	HasObserver (unsigned long event)

int	HasObserver (const char *event)

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, void(T::*callback)(), float priority=0.0f)

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)

int	InvokeEvent (unsigned long event, void *callData)

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

virtual void	Delete ()

virtual void	FastDelete ()

void	Print (ostream &os)

void	SetReferenceCount (int)

void	PrintRevisions (ostream &)

virtual void	PrintHeader (ostream &os, vtkIndent indent)

virtual void	PrintTrailer (ostream &os, vtkIndent indent)

int	GetReferenceCount ()

Static Public Member Functions
static vtkOpenGLHAVSVolumeMapper *	New ()

static int	IsTypeOf (const char *type)

static vtkOpenGLHAVSVolumeMapper *	SafeDownCast (vtkObjectBase *o)

Static Public Member Functions inherited from vtkHAVSVolumeMapper
static vtkHAVSVolumeMapper *	New ()

static int	IsTypeOf (const char *type)

static vtkHAVSVolumeMapper *	SafeDownCast (vtkObjectBase *o)

Static Public Member Functions inherited from vtkUnstructuredGridVolumeMapper
static int	IsTypeOf (const char *type)

static vtkUnstructuredGridVolumeMapper *	SafeDownCast (vtkObjectBase *o)

Static Public Member Functions inherited from vtkAbstractVolumeMapper
static int	IsTypeOf (const char *type)

static vtkAbstractVolumeMapper *	SafeDownCast (vtkObjectBase *o)

Static Public Member Functions inherited from vtkAbstractMapper3D
static int	IsTypeOf (const char *type)

static vtkAbstractMapper3D *	SafeDownCast (vtkObjectBase *o)

Static Public Member Functions inherited from vtkAbstractMapper
static int	IsTypeOf (const char *type)

static vtkAbstractMapper *	SafeDownCast (vtkObjectBase *o)

static vtkDataArray *	GetScalars (vtkDataSet input, int scalarMode, int arrayAccessMode, int arrayId, const char arrayName, int &cellFlag)

static vtkAbstractArray *	GetAbstractScalars (vtkDataSet input, int scalarMode, int arrayAccessMode, int arrayId, const char arrayName, int &cellFlag)

Static Public Member Functions inherited from vtkAlgorithm
static vtkAlgorithm *	New ()

static int	IsTypeOf (const char *type)

static vtkAlgorithm *	SafeDownCast (vtkObjectBase *o)

static vtkInformationIntegerKey *	INPUT_IS_OPTIONAL ()

static vtkInformationIntegerKey *	INPUT_IS_REPEATABLE ()

static vtkInformationInformationVectorKey *	INPUT_REQUIRED_FIELDS ()

static vtkInformationStringVectorKey *	INPUT_REQUIRED_DATA_TYPE ()

static vtkInformationInformationVectorKey *	INPUT_ARRAYS_TO_PROCESS ()

static vtkInformationIntegerKey *	INPUT_PORT ()

static vtkInformationIntegerKey *	INPUT_CONNECTION ()

static vtkInformationIntegerKey *	CAN_PRODUCE_SUB_EXTENT ()

static vtkInformationIntegerKey *	CAN_HANDLE_PIECE_REQUEST ()

static void	SetDefaultExecutivePrototype (vtkExecutive *proto)

Static Public Member Functions inherited from vtkObject
static int	IsTypeOf (const char *type)

static vtkObject *	SafeDownCast (vtkObjectBase *o)

static vtkObject *	New ()

static void	BreakOnError ()

static void	SetGlobalWarningDisplay (int val)

static void	GlobalWarningDisplayOn ()

static void	GlobalWarningDisplayOff ()

static int	GetGlobalWarningDisplay ()

Static Public Member Functions inherited from vtkObjectBase
static int	IsTypeOf (const char *name)

static vtkObjectBase *	New ()

Protected Member Functions
virtual vtkObjectBase *	NewInstanceInternal () const

	vtkOpenGLHAVSVolumeMapper ()

	~vtkOpenGLHAVSVolumeMapper ()

virtual int	FillInputPortInformation (int port, vtkInformation *info)

virtual void	Initialize (vtkRenderer ren, vtkVolume vol)

virtual void	InitializeLookupTables (vtkVolume *vol)

void	InitializeGPUDataStructures ()

void	InitializeShaders ()

void	DeleteShaders ()

void	InitializeFramebufferObject ()

void	RenderHAVS (vtkRenderer *ren)

void	SetupFBOZBuffer (int screenWidth, int screenHeight, float depthNear, float depthFar, float *zbuffer)

void	SetupFBOMRT ()

void	DrawFBOInit (int screenWidth, int screenHeight, float depthNear, float depthFar)

void	DrawFBOGeometry ()

void	DrawFBOFlush (int screenWidth, int screenHeight, float depthNear, float depthFar)

void	DrawBlend (int screenWidth, int screenHeight, float depthNear, float depthFar)

void	CheckOpenGLError (const char *str)

Protected Member Functions inherited from vtkHAVSVolumeMapper
	vtkHAVSVolumeMapper ()

	~vtkHAVSVolumeMapper ()

void	InitializePrimitives (vtkVolume *vol)

void	InitializeScalars ()

void	InitializeLevelOfDetail ()

void	InitializeLookupTables (vtkVolume *vol)

void	FRadixSort (vtkHAVSSortedFace array, vtkHAVSSortedFace temp, int lo, int up)

void	FRadix (int byte, int len, vtkHAVSSortedFace source, vtkHAVSSortedFace dest, int *count)

void	UpdateLevelOfDetail (float targetTime)

void	PartialVisibilitySort (float *eye)

bool	CheckInitializationError ()

Protected Member Functions inherited from vtkUnstructuredGridVolumeMapper
	vtkUnstructuredGridVolumeMapper ()

	~vtkUnstructuredGridVolumeMapper ()

Protected Member Functions inherited from vtkAbstractVolumeMapper
	vtkAbstractVolumeMapper ()

	~vtkAbstractVolumeMapper ()

Protected Member Functions inherited from vtkAbstractMapper3D
	vtkAbstractMapper3D ()

	~vtkAbstractMapper3D ()

Protected Member Functions inherited from vtkAbstractMapper
	vtkAbstractMapper ()

	~vtkAbstractMapper ()

Protected Member Functions inherited from vtkAlgorithm
	vtkAlgorithm ()

	~vtkAlgorithm ()

virtual int	FillOutputPortInformation (int port, vtkInformation *info)

virtual void	SetNumberOfInputPorts (int n)

virtual void	SetNumberOfOutputPorts (int n)

int	InputPortIndexInRange (int index, const char *action)

int	OutputPortIndexInRange (int index, const char *action)

int	GetInputArrayAssociation (int idx, vtkInformationVector **inputVector)

virtual vtkExecutive *	CreateDefaultExecutive ()

virtual void	ReportReferences (vtkGarbageCollector *)

virtual void	SetNumberOfInputConnections (int port, int n)

int	GetInputArrayAssociation (int idx, int connection, vtkInformationVector **inputVector)

int	GetInputArrayAssociation (int idx, vtkDataObject *input)

vtkDataArray *	GetInputArrayToProcess (int idx, vtkInformationVector **inputVector)

vtkDataArray *	GetInputArrayToProcess (int idx, vtkInformationVector **inputVector, int &association)

vtkDataArray *	GetInputArrayToProcess (int idx, int connection, vtkInformationVector **inputVector)

vtkDataArray *	GetInputArrayToProcess (int idx, int connection, vtkInformationVector **inputVector, int &association)

vtkDataArray *	GetInputArrayToProcess (int idx, vtkDataObject *input)

vtkDataArray *	GetInputArrayToProcess (int idx, vtkDataObject *input, int &association)

vtkAbstractArray *	GetInputAbstractArrayToProcess (int idx, vtkInformationVector **inputVector)

vtkAbstractArray *	GetInputAbstractArrayToProcess (int idx, vtkInformationVector **inputVector, int &association)

vtkAbstractArray *	GetInputAbstractArrayToProcess (int idx, int connection, vtkInformationVector **inputVector)

vtkAbstractArray *	GetInputAbstractArrayToProcess (int idx, int connection, vtkInformationVector **inputVector, int &association)

vtkAbstractArray *	GetInputAbstractArrayToProcess (int idx, vtkDataObject *input)

vtkAbstractArray *	GetInputAbstractArrayToProcess (int idx, vtkDataObject *input, int &association)

vtkInformation *	GetInputArrayFieldInformation (int idx, vtkInformationVector **inputVector)

virtual void	SetNthInputConnection (int port, int index, vtkAlgorithmOutput *input)

void	SetInputDataInternal (int port, vtkDataObject *input)

void	AddInputDataInternal (int port, vtkDataObject *input)

virtual void	SetErrorCode (unsigned long)

Protected Member Functions inherited from vtkObject
	vtkObject ()

virtual	~vtkObject ()

virtual void	RegisterInternal (vtkObjectBase *, int check)

virtual void	UnRegisterInternal (vtkObjectBase *, int check)

void	InternalGrabFocus (vtkCommand mouseEvents, vtkCommand keypressEvents=NULL)

void	InternalReleaseFocus ()

Protected Member Functions inherited from vtkObjectBase
	vtkObjectBase ()

virtual	~vtkObjectBase ()

virtual void	CollectRevisions (ostream &)

	vtkObjectBase (const vtkObjectBase &)

void	operator= (const vtkObjectBase &)

Protected Attributes
unsigned int	VBOVertexName

unsigned int	VBOTexCoordName

unsigned int	VBOVertexIndexName

unsigned int	VertexProgram

unsigned int	FragmentProgramBegin

unsigned int	FragmentProgram

unsigned int	FragmentProgramEnd

unsigned int	FramebufferObject

int	FramebufferObjectSize

unsigned int	FramebufferTextures [4]

unsigned int	DepthTexture

unsigned int	PsiTableTexture

unsigned int	TransferFunctionTexture

vtkWeakPointer< vtkRenderWindow >	RenderWindow

Protected Attributes inherited from vtkHAVSVolumeMapper
float *	Vertices

float *	Scalars

double	ScalarRange [2]

unsigned int *	Triangles

unsigned int *	OrderedTriangles

vtkHAVSSortedFace *	SortedFaces

vtkHAVSSortedFace *	RadixTemp

float *	Centers

unsigned int	NumberOfVertices

unsigned int	NumberOfCells

unsigned int	NumberOfScalars

unsigned int	NumberOfTriangles

unsigned int	NumberOfBoundaryTriangles

unsigned int	NumberOfInternalTriangles

unsigned int *	BoundaryTriangles

unsigned int *	InternalTriangles

unsigned int	LevelOfDetailTriangleCount

float	CurrentLevelOfDetail

float	LevelOfDetailTargetTime

bool	LevelOfDetail

int	LevelOfDetailMethod

int	KBufferState

float	MaxEdgeLength

float	LevelOfDetailMaxEdgeLength

float	UnitDistance

bool	GPUDataStructures

float	Diagonal

bool	PartiallyRemoveNonConvexities

int	KBufferSize

float *	TransferFunction

int	TransferFunctionSize

bool	Initialized

int	InitializationError

int	FrameNumber

float	TotalRenderTime

vtkTimeStamp	ColorTransferFunctionMTime

vtkTimeStamp	AlphaTransferFunctionMTime

vtkTimeStamp	UnstructuredGridMTime

vtkTimeStamp	ScalarsMTime

vtkVolume *	LastVolume

Protected Attributes inherited from vtkUnstructuredGridVolumeMapper
int	BlendMode

Protected Attributes inherited from vtkAbstractVolumeMapper
int	ScalarMode

char *	ArrayName

int	ArrayId

int	ArrayAccessMode

Protected Attributes inherited from vtkAbstractMapper3D
double	Bounds [6]

double	Center [3]

Protected Attributes inherited from vtkAbstractMapper
vtkTimerLog *	Timer

double	TimeToDraw

vtkWindow *	LastWindow

vtkPlaneCollection *	ClippingPlanes

Protected Attributes inherited from vtkAlgorithm
vtkInformation *	Information

double	Progress

char *	ProgressText

vtkProgressObserver *	ProgressObserver

unsigned long	ErrorCode

Protected Attributes inherited from vtkObject
bool	Debug

vtkTimeStamp	MTime

vtkSubjectHelper *	SubjectHelper

Protected Attributes inherited from vtkObjectBase
vtkAtomicInt32	ReferenceCount

vtkWeakPointerBase **	WeakPointers

Additional Inherited Members
Public Attributes inherited from vtkAlgorithm
int	AbortExecute

Protected Types inherited from vtkHAVSVolumeMapper
enum	{ NO_INIT_ERROR =0, NON_TETRAHEDRA =1, UNSUPPORTED_EXTENSIONS =2, NO_SCALARS =3, CELL_DATA =4, NO_CELLS =5 }

Static Protected Member Functions inherited from vtkAlgorithm
static vtkInformationIntegerKey *	PORT_REQUIREMENTS_FILLED ()

Static Protected Attributes inherited from vtkAlgorithm
static vtkExecutive *	DefaultExecutivePrototype

Detailed Description

Hardware-Assisted Visibility Sorting unstructured grid mapper, OpenGL implementation.

vtkHAVSVolumeMapper is a class that renders polygonal data (represented as an unstructured grid) using the Hardware-Assisted Visibility Sorting (HAVS) algorithm. First the unique triangles are sorted in object space, then they are sorted in image space using a fixed size A-buffer implemented on the GPU called the k-buffer. The HAVS algorithm excels at rendering large datasets quickly. The trade-off is that the algorithm may produce some rendering artifacts due to an insufficient k size (currently 2 or 6 is supported) or read/write race conditions.

A built in level-of-detail (LOD) approach samples the geometry using one of two heuristics (field or area). If LOD is enabled, the amount of geometry that is sampled and rendered changes dynamically to stay within the target frame rate. The field sampling method generally works best for datasets with cell sizes that don't vary much in size. On the contrary, the area sampling approach gives better approximations when the volume has a lot of variation in cell size.

The HAVS algorithm uses several advanced features on graphics hardware. The k-buffer sorting network is implemented using framebuffer objects (FBOs) with multiple render targets (MRTs). Therefore, only cards that support these features can run the algorithm (at least an ATI 9500 or an NVidia NV40 (6600)).

Attention: Several issues had to be addressed to get the HAVS algorithm working within the vtk framework. These additions forced the code to forsake speed for the sake of compliance and robustness.; The HAVS algorithm operates on the triangles that compose the mesh. Therefore, before rendering, the cells are decomposed into unique triangles and stored on the GPU for efficient rendering. The use of GPU data structures is only recommended if the entire geometry can fit in graphics memory. Otherwise this feature should be disabled.; Another new feature is the handling of mixed data types (eg., polygonal data with volume data). This is handled by reading the z-buffer from the current window and copying it into the framebuffer object for off-screen rendering. The depth test is then enabled so that the volume only appears over the opaque geometry. Finally, the results of the off-screen rendering are blended into the framebuffer as a transparent, view-aligned texture.; Instead of using a preintegrated 3D lookup table for storing the ray integral, this implementation uses partial pre-integration. This improves the performance of dynamic transfer function updates by avoiding a costly preprocess of the table.; A final change to the original algorithm is the handling of non-convexities in the mesh. Due to read/write hazards that may create undesired artifacts with non-convexities when using a inside/outside toggle in the fragment program, another approach was employed. To handle non-convexities, the fragment shader determines if a ray-gap is larger than the max cell size and kill the fragment if so. This approximation performs rather well in practice but may miss small non-convexities.; For more information on the HAVS algorithm see:; "Hardware-Assisted Visibility Sorting for Unstructured Volume Rendering" by S. P. Callahan, M. Ikits, J. L. D. Comba, and C. T. Silva, IEEE Transactions of Visualization and Computer Graphics; May/June 2005.; For more information on the Level-of-Detail algorithm, see:; "Interactive Rendering of Large Unstructured Grids Using Dynamic Level-of-Detail" by S. P. Callahan, J. L. D. Comba, P. Shirley, and C. T. Silva, Proceedings of IEEE Visualization '05, Oct. 2005.

Acknowledgments:: This code was developed by Steven P. Callahan under the supervision of Prof. Claudio T. Silva. The code also contains contributions from Milan Ikits, Linh Ha, Huy T. Vo, Carlos E. Scheidegger, and Joao L. D. Comba.

Acknowledgments:: The work was supported by grants, contracts, and gifts from the National Science Foundation, the Department of Energy, the Army Research Office, and IBM.

Acknowledgments:: The port of HAVS to VTK and ParaView has been primarily supported by Sandia National Labs.

Definition at line 128 of file vtkOpenGLHAVSVolumeMapper.h.

Member Typedef Documentation

typedef vtkHAVSVolumeMapper vtkOpenGLHAVSVolumeMapper::Superclass

Definition at line 134 of file vtkOpenGLHAVSVolumeMapper.h.

Constructor & Destructor Documentation

vtkOpenGLHAVSVolumeMapper::vtkOpenGLHAVSVolumeMapper ( )

protected

vtkOpenGLHAVSVolumeMapper::~vtkOpenGLHAVSVolumeMapper ( )

protected

Member Function Documentation

static vtkOpenGLHAVSVolumeMapper* vtkOpenGLHAVSVolumeMapper::New ( )

static

static int vtkOpenGLHAVSVolumeMapper::IsTypeOf ( const char * type )

static

virtual int vtkOpenGLHAVSVolumeMapper::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 vtkHAVSVolumeMapper.

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

static

virtual vtkObjectBase* vtkOpenGLHAVSVolumeMapper::NewInstanceInternal ( ) const

protectedvirtual

Reimplemented from vtkHAVSVolumeMapper.

vtkOpenGLHAVSVolumeMapper* vtkOpenGLHAVSVolumeMapper::NewInstance ( ) const

virtual void vtkOpenGLHAVSVolumeMapper::PrintSelf	(	ostream &	os,
		vtkIndent	indent
	)

virtual

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 vtkHAVSVolumeMapper.

virtual void vtkOpenGLHAVSVolumeMapper::Render	(	vtkRenderer *	ren,
		vtkVolume *	vol
	)

virtual

Render the volume

Implements vtkUnstructuredGridVolumeMapper.

virtual void vtkOpenGLHAVSVolumeMapper::ReleaseGraphicsResources ( vtkWindow * )

virtual

Release any graphics resources that are being consumed by this volume renderer.

Reimplemented from vtkUnstructuredGridVolumeMapper.

virtual void vtkOpenGLHAVSVolumeMapper::SetGPUDataStructures ( bool )

virtual

Set/get whether or not the data structures should be stored on the GPU for better peformance.

Implements vtkHAVSVolumeMapper.

virtual bool vtkOpenGLHAVSVolumeMapper::SupportedByHardware ( vtkRenderer * r )

virtual

Check hardware support for the HAVS algorithm. Necessary features include off-screen rendering, 32-bit fp textures, multiple render targets, and framebuffer objects. Subclasses must override this method to indicate if supported by Hardware.

virtual int vtkOpenGLHAVSVolumeMapper::FillInputPortInformation	(	int	port,
		vtkInformation *	info
	)

protectedvirtual

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 vtkUnstructuredGridVolumeMapper.