An object to control sort-last parallel rendering. More...

#include <vtkCompositeRenderManager.h>

Inheritance diagram for vtkCompositeRenderManager:

Collaboration diagram for vtkCompositeRenderManager:

Public Types
typedef vtkParallelRenderManager	Superclass

Public Types inherited from vtkParallelRenderManager
enum	{ NEAREST, LINEAR }

enum	Tags { RENDER_RMI_TAG =34532, COMPUTE_VISIBLE_PROP_BOUNDS_RMI_TAG =54636, WIN_INFO_TAG =87834, REN_INFO_TAG =87836, LIGHT_INFO_TAG =87838, REN_ID_TAG =58794, BOUNDS_TAG =23543 }

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...

vtkCompositeRenderManager *	NewInstance () const

void	PrintSelf (ostream &os, vtkIndent indent) override
	Methods invoked by print to print information about the object including superclasses. More...


void	SetCompositer (vtkCompositer *c)
	Set/Get the composite algorithm. More...

virtual vtkCompositer *	GetCompositer ()
	Set/Get the composite algorithm. More...

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

void	PrintSelf (ostream &os, vtkIndent indent) override
	Methods invoked by print to print information about the object including superclasses. More...

virtual vtkRenderWindow *	MakeRenderWindow ()
	Builds a vtkRenderWindow compatible with this render manager. More...

virtual vtkRenderer *	MakeRenderer ()
	Builds a vtkRenderer compatible with this render manager. More...

virtual void	InitializePieces ()
	This method sets the piece and number of pieces for each actor with a polydata mapper. More...

virtual void	InitializeOffScreen ()
	Make all rendering windows not viewable set as off screen rendering. More...

virtual void	StartInteractor ()
	Initializes the RMIs and then, if on root node, starts the interactor on the attached render window. More...

virtual void	StartServices ()
	If on node other than root, starts serving RMI requests for parallel renders. More...

virtual void	StopServices ()
	If on root node, stops the RMI processing on all service nodes. More...

virtual void	InitializeRMIs ()

virtual void	ResetAllCameras ()
	Resets the camera of each renderer contained in the RenderWindow. More...

virtual void	ComputeVisiblePropBounds (vtkRenderer *ren, double bounds[6])
	Calculates the bounds by gathering information from all processes. More...

virtual void	SetMaxImageReductionFactor (double)

virtual double	GetMaxImageReductionFactor ()

virtual void	SetImageReductionFactorForUpdateRate (double DesiredUpdateRate)
	Sets the ReductionFactor based on the given desired update rate and the rendering metrics taken from the last time UpdateServerInfo was called. More...

void	TileWindows (int xsize, int ysize, int nColumns)
	Given the x and y size of the render windows, reposition them in a tile of n columns. More...

virtual void	CheckForAbortRender ()

virtual int	CheckForAbortComposite ()

virtual vtkRenderWindow *	GetRenderWindow ()
	Set/Get the RenderWindow to use for compositing. More...

virtual void	SetRenderWindow (vtkRenderWindow *renWin)
	Set/Get the RenderWindow to use for compositing. More...

virtual vtkMultiProcessController *	GetController ()
	Set/Get the vtkMultiProcessController which will handle communications for the parallel rendering. More...

virtual void	SetController (vtkMultiProcessController *controller)
	Set/Get the vtkMultiProcessController which will handle communications for the parallel rendering. More...

virtual void	StartRender ()
	Callbacks that initialize and finish rendering and other tasks. More...

virtual void	EndRender ()
	Callbacks that initialize and finish rendering and other tasks. More...

virtual void	SatelliteStartRender ()
	Callbacks that initialize and finish rendering and other tasks. More...

virtual void	SatelliteEndRender ()
	Callbacks that initialize and finish rendering and other tasks. More...

virtual void	RenderRMI ()
	Callbacks that initialize and finish rendering and other tasks. More...

virtual void	ResetCamera (vtkRenderer *ren)
	Callbacks that initialize and finish rendering and other tasks. More...

virtual void	ResetCameraClippingRange (vtkRenderer *ren)
	Callbacks that initialize and finish rendering and other tasks. More...

virtual void	ComputeVisiblePropBoundsRMI (int renderId)
	Callbacks that initialize and finish rendering and other tasks. More...

virtual void	SetParallelRendering (int)
	Turns on/off parallel rendering. More...

virtual int	GetParallelRendering ()
	Turns on/off parallel rendering. More...

virtual void	ParallelRenderingOn ()
	Turns on/off parallel rendering. More...

virtual void	ParallelRenderingOff ()
	Turns on/off parallel rendering. More...

virtual void	SetRenderEventPropagation (int)
	Turns on/off render event propagation. More...

virtual int	GetRenderEventPropagation ()
	Turns on/off render event propagation. More...

virtual void	RenderEventPropagationOn ()
	Turns on/off render event propagation. More...

virtual void	RenderEventPropagationOff ()
	Turns on/off render event propagation. More...

virtual void	SetUseCompositing (int)
	This is used for tiled display rendering. More...

virtual int	GetUseCompositing ()
	This is used for tiled display rendering. More...

virtual void	UseCompositingOn ()
	This is used for tiled display rendering. More...

virtual void	UseCompositingOff ()
	This is used for tiled display rendering. More...

virtual void	SetImageReductionFactor (double factor)
	Set/Get the reduction factor (for sort-last based parallel renderers). More...

virtual double	GetImageReductionFactor ()
	Set/Get the reduction factor (for sort-last based parallel renderers). More...

virtual void	SetAutoImageReductionFactor (int)
	If on, the ReductionFactor is automatically adjusted to best meet the the DesiredUpdateRate in the current RenderWindow based on metrics from the last render. More...

virtual int	GetAutoImageReductionFactor ()
	If on, the ReductionFactor is automatically adjusted to best meet the the DesiredUpdateRate in the current RenderWindow based on metrics from the last render. More...

virtual void	AutoImageReductionFactorOn ()
	If on, the ReductionFactor is automatically adjusted to best meet the the DesiredUpdateRate in the current RenderWindow based on metrics from the last render. More...

virtual void	AutoImageReductionFactorOff ()
	If on, the ReductionFactor is automatically adjusted to best meet the the DesiredUpdateRate in the current RenderWindow based on metrics from the last render. More...

virtual double	GetRenderTime ()
	Get rendering metrics. More...

virtual double	GetImageProcessingTime ()
	Get rendering metrics. More...

virtual int	GetSyncRenderWindowRenderers ()
	By default, the state of all renderers in the root's render window is propagated to the rest of the processes. More...

virtual void	SetSyncRenderWindowRenderers (int)
	By default, the state of all renderers in the root's render window is propagated to the rest of the processes. More...

virtual void	SyncRenderWindowRenderersOn ()
	By default, the state of all renderers in the root's render window is propagated to the rest of the processes. More...

virtual void	SyncRenderWindowRenderersOff ()
	By default, the state of all renderers in the root's render window is propagated to the rest of the processes. More...

virtual void	AddRenderer (vtkRenderer *)
	By default, the state of all renderers in the root's render window is propagated to the rest of the processes. More...

virtual void	RemoveRenderer (vtkRenderer *)
	By default, the state of all renderers in the root's render window is propagated to the rest of the processes. More...

virtual void	RemoveAllRenderers ()
	By default, the state of all renderers in the root's render window is propagated to the rest of the processes. More...

virtual void	SetWriteBackImages (int)
	If on (the default), the result of any image space manipulations are written back to the render window frame buffer. More...

virtual int	GetWriteBackImages ()
	If on (the default), the result of any image space manipulations are written back to the render window frame buffer. More...

virtual void	WriteBackImagesOn ()
	If on (the default), the result of any image space manipulations are written back to the render window frame buffer. More...

virtual void	WriteBackImagesOff ()
	If on (the default), the result of any image space manipulations are written back to the render window frame buffer. More...

virtual void	SetMagnifyImages (int)
	If on (the default), when the ImageReductionFactor is greater than 1 and WriteBackImages is on, the image will be magnified to fill the entire render window. More...

virtual int	GetMagnifyImages ()
	If on (the default), when the ImageReductionFactor is greater than 1 and WriteBackImages is on, the image will be magnified to fill the entire render window. More...

virtual void	MagnifyImagesOn ()
	If on (the default), when the ImageReductionFactor is greater than 1 and WriteBackImages is on, the image will be magnified to fill the entire render window. More...

virtual void	MagnifyImagesOff ()
	If on (the default), when the ImageReductionFactor is greater than 1 and WriteBackImages is on, the image will be magnified to fill the entire render window. More...

virtual void	SetMagnifyImageMethod (int method)
	Sets the method used to magnify images. More...

virtual int	GetMagnifyImageMethod ()
	Sets the method used to magnify images. More...

void	SetMagnifyImageMethodToNearest ()
	Sets the method used to magnify images. More...

void	SetMagnifyImageMethodToLinear ()
	Sets the method used to magnify images. More...

virtual void	GetPixelData (vtkUnsignedCharArray *data)
	The most appropriate way to retrieve full size image data after a render. More...

virtual void	GetPixelData (int x1, int y1, int x2, int y2, vtkUnsignedCharArray *data)
	The most appropriate way to retrieve full size image data after a render. More...

virtual void	GetReducedPixelData (vtkUnsignedCharArray *data)
	The most appropriate way to retrieve reduced size image data after a render. More...

virtual void	GetReducedPixelData (int x1, int y1, int x2, int y2, vtkUnsignedCharArray *data)
	The most appropriate way to retrieve reduced size image data after a render. More...

virtual int *	GetFullImageSize ()
	Returns the full image size calculated at the last render. More...

virtual void	GetFullImageSize (int &, int &)
	Returns the full image size calculated at the last render. More...

virtual void	GetFullImageSize (int[2])
	Returns the full image size calculated at the last render. More...

virtual int *	GetReducedImageSize ()
	Returns the reduced image size calculated at the last render. More...

virtual void	GetReducedImageSize (int &, int &)
	Returns the reduced image size calculated at the last render. More...

virtual void	GetReducedImageSize (int[2])
	Returns the reduced image size calculated at the last render. More...

virtual void	SetUseRGBA (int)
	Get/Set if all Images must use RGBA instead of RGB. More...

virtual int	GetUseRGBA ()
	Get/Set if all Images must use RGBA instead of RGB. More...

virtual void	SetForceRenderWindowSize (int)
	If ForceRenderWindowSize is set to true, the render manager will use the RenderWindowSize ivar instead of getting the size from the render window. More...

virtual int	GetForceRenderWindowSize ()
	If ForceRenderWindowSize is set to true, the render manager will use the RenderWindowSize ivar instead of getting the size from the render window. More...

virtual void	SetForcedRenderWindowSize (int, int)
	If ForceRenderWindowSize is set to true, the render manager will use the Size ivar instead of getting the size from the render window. More...

void	SetForcedRenderWindowSize (int[2])
	If ForceRenderWindowSize is set to true, the render manager will use the Size ivar instead of getting the size from the render window. More...

virtual int *	GetForcedRenderWindowSize ()
	If ForceRenderWindowSize is set to true, the render manager will use the Size ivar instead of getting the size from the render window. More...

virtual void	GetForcedRenderWindowSize (int &, int &)
	If ForceRenderWindowSize is set to true, the render manager will use the Size ivar instead of getting the size from the render window. More...

virtual void	GetForcedRenderWindowSize (int[2])
	If ForceRenderWindowSize is set to true, the render manager will use the Size ivar instead of getting the size from the render window. More...

virtual void	SetUseBackBuffer (int)
	The default is to allow the use of the back buffer for compositing. More...

virtual int	GetUseBackBuffer ()
	The default is to allow the use of the back buffer for compositing. More...

virtual void	UseBackBufferOn ()
	The default is to allow the use of the back buffer for compositing. More...

virtual void	UseBackBufferOff ()
	The default is to allow the use of the back buffer for compositing. More...

virtual void	SetSynchronizeTileProperties (int)
	When set the render manager will synchronize the TileViewport and TileScale properties. More...

virtual int	GetSynchronizeTileProperties ()
	When set the render manager will synchronize the TileViewport and TileScale properties. More...

virtual void	SynchronizeTilePropertiesOn ()
	When set the render manager will synchronize the TileViewport and TileScale properties. More...

virtual void	SynchronizeTilePropertiesOff ()
	When set the render manager will synchronize the TileViewport and TileScale properties. More...

virtual void	GenericStartRenderCallback ()
	INTERNAL METHODS (DON NOT USE). More...

virtual void	GenericEndRenderCallback ()
	INTERNAL METHODS (DON NOT USE). More...

virtual void	MagnifyImage (vtkUnsignedCharArray fullImage, const int fullImageSize[2], vtkUnsignedCharArray reducedImage, const int reducedImageSize[2], const int fullImageViewport[4]=nullptr, const int reducedImageViewport[4]=nullptr)
	Convenience functions for magnifying images. More...

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...

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)

int	InvokeEvent (unsigned long event)

int	InvokeEvent (const char *event)

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)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

vtkCommand *	GetCommand (unsigned long tag)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

void	RemoveObserver (vtkCommand *)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

void	RemoveObservers (unsigned long event, vtkCommand *)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

void	RemoveObservers (const char event, vtkCommand )
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

vtkTypeBool	HasObserver (unsigned long event, vtkCommand *)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

vtkTypeBool	HasObserver (const char event, vtkCommand )
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

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)
	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, 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)
	This method invokes an event and return whether the event was aborted or not. More...

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	Register (vtkObjectBase *o)
	Increase the reference count (mark as used by another object). More...

virtual void	UnRegister (vtkObjectBase *o)
	Decrease the reference count (release by another object). More...

int	GetReferenceCount ()
	Return the current reference count of this object. More...

void	SetReferenceCount (int)
	Sets the reference count. More...

void	PrintRevisions (ostream &)
	Legacy. More...

virtual void	PrintHeader (ostream &os, vtkIndent indent)
	Methods invoked by print to print information about the object including superclasses. More...

virtual void	PrintTrailer (ostream &os, vtkIndent indent)
	Methods invoked by print to print information about the object including superclasses. More...

Static Public Member Functions
static vtkTypeBool	IsTypeOf (const char *type)

static vtkCompositeRenderManager *	SafeDownCast (vtkObjectBase *o)

static vtkCompositeRenderManager *	New ()

Static Public Member Functions inherited from vtkParallelRenderManager
static vtkTypeBool	IsTypeOf (const char *type)

static vtkParallelRenderManager *	SafeDownCast (vtkObjectBase *o)

static void	SetDefaultRenderEventPropagation (bool val)
	Get/Set the default value used for RenderEventPropagation when a new instance of vtkParallelRenderManager is created. More...

static bool	GetDefaultRenderEventPropagation ()

static void	MagnifyImageNearest (vtkUnsignedCharArray fullImage, const int fullImageSize[2], vtkUnsignedCharArray reducedImage, const int reducedImageSize[2], const int fullImageViewport[4]=nullptr, const int reducedImageViewport[4]=nullptr)
	Convenience functions for magnifying images. More...

static void	MagnifyImageLinear (vtkUnsignedCharArray fullImage, const int fullImageSize[2], vtkUnsignedCharArray reducedImage, const int reducedImageSize[2], const int fullImageViewport[4]=nullptr, const int reducedImageViewport[4]=nullptr)
	Convenience functions for magnifying images. More...

Static Public Member Functions inherited from vtkObject
static vtkObject *	New ()
	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 ()
	This is a global flag that controls whether any debug, warning or error messages are displayed. More...

static void	GlobalWarningDisplayOff ()
	This is a global flag that controls whether any debug, warning or error messages are displayed. More...

static int	GetGlobalWarningDisplay ()
	This is a global flag that controls whether any debug, warning or error messages are displayed. More...

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 vtkObjectBase *	New ()
	Create an object with Debug turned off, modified time initialized to zero, and reference counting on. More...

Protected Member Functions
virtual vtkObjectBase *	NewInstanceInternal () const

	vtkCompositeRenderManager ()

	~vtkCompositeRenderManager () override

void	PreRenderProcessing () override
	Here is a good place to handle processing of data before and after render. More...

void	PostRenderProcessing () override
	Here is a good place to handle processing of data before and after render. More...

Protected Member Functions inherited from vtkParallelRenderManager
	vtkParallelRenderManager ()

	~vtkParallelRenderManager () override

virtual vtkRendererCollection *	GetRenderers ()

virtual void	SendWindowInformation ()
	Used to synchronize rendering information per frame. More...

virtual void	ReceiveWindowInformation ()

virtual void	SendRendererInformation (vtkRenderer *)

virtual void	ReceiveRendererInformation (vtkRenderer *)

virtual void	CollectWindowInformation (vtkMultiProcessStream &)
	Subclass should override these methods (instead of SendWindowInformation/ReceiveWindowInformation or SendRendererInformation/ReceiveRendererInformation) to collect or process meta-data to synchronize rendering information per frame. More...

virtual bool	ProcessWindowInformation (vtkMultiProcessStream &)

virtual void	CollectRendererInformation (vtkRenderer *, vtkMultiProcessStream &)

virtual bool	ProcessRendererInformation (vtkRenderer *, vtkMultiProcessStream &)

virtual void	SetRenderWindowSize ()
	Called in satellites to set the render window size to the current FullImageSize and ReducedImageSize (or vice versa). More...

virtual void	LocalComputeVisiblePropBounds (vtkRenderer *ren, double bounds[6])
	Called by ComputeVisiblePropBoundsRMI to get the bounds of a local renderer. More...

virtual void	MagnifyReducedImage ()
	When called, fills FullImage. More...

virtual void	WriteFullImage ()
	Write the full image back to the RenderWindow. More...

virtual void	ReadReducedImage ()
	Reads in the reduced image from the RenderWindow. More...

virtual int	LastRenderInFrontBuffer ()
	Returns 1 if the RenderWindow's last image is in the front buffer, 0 if it is in the back. More...

virtual int	ChooseBuffer ()
	Select buffer to read from / render into. More...

virtual void	SetRenderWindowPixelData (vtkUnsignedCharArray *pixels, const int pixelDimensions[2])
	Sets the current render window's pixel data. More...

virtual int	ImageReduceRenderer (vtkRenderer *)
	Returns true if the image for the given renderer should be rendered at a reduced size to be magnified later. More...

void	AddRenderWindowEventHandlers ()
	Add/Remove event handlers for the render window. More...

void	RemoveRenderWindowEventHandlers ()
	Add/Remove event handlers for the render window. More...

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 ()
	These methods allow a command to exclusively grab all events. More...

Protected Member Functions inherited from vtkObjectBase
	vtkObjectBase ()

virtual	~vtkObjectBase ()

virtual void	CollectRevisions (ostream &)

virtual void	ReportReferences (vtkGarbageCollector *)

	vtkObjectBase (const vtkObjectBase &)

void	operator= (const vtkObjectBase &)

Protected Attributes
vtkCompositer *	Compositer

vtkFloatArray *	DepthData

vtkUnsignedCharArray *	TmpPixelData

vtkFloatArray *	TmpDepthData

int	SavedMultiSamplesSetting

Protected Attributes inherited from vtkParallelRenderManager
vtkRenderWindow *	RenderWindow

vtkMultiProcessController *	Controller

vtkRendererCollection *	Renderers

int	ForceRenderWindowSize

int	ForcedRenderWindowSize [2]

int	RootProcessId
	The "root" node's process id. More...

int	ObservingRenderWindow

int	ObservingAbort

unsigned long	StartRenderTag

unsigned long	EndRenderTag

unsigned long	ResetCameraTag

unsigned long	ResetCameraClippingRangeTag

unsigned long	AbortRenderCheckTag

double	ImageReductionFactor

double	MaxImageReductionFactor

int	AutoImageReductionFactor

int	WriteBackImages

int	MagnifyImages

int	MagnifyImageMethod

int	UseRGBA

int	SynchronizeTileProperties

int	FullImageSize [2]

int	ReducedImageSize [2]

vtkUnsignedCharArray *	FullImage

vtkUnsignedCharArray *	ReducedImage

int	FullImageUpToDate

int	ReducedImageUpToDate

int	RenderWindowImageUpToDate

vtkDoubleArray *	Viewports

int	Lock

int	ParallelRendering

int	RenderEventPropagation

int	UseCompositing

int	SyncRenderWindowRenderers

vtkTimerLog *	Timer

double	RenderTime

double	ImageProcessingTime

double	AverageTimePerPixel
	Used by SetImageReductionFactorForUpdateRate to smooth transitions transitions between image reduction factors. More...

int	AddedRMIs

unsigned long	RenderRMIId

unsigned long	BoundsRMIId

int	UseBackBuffer

Protected Attributes inherited from vtkObject
bool	Debug

vtkTimeStamp	MTime

vtkSubjectHelper *	SubjectHelper

Protected Attributes inherited from vtkObjectBase
vtkAtomicInt32	ReferenceCount

vtkWeakPointerBase **	WeakPointers

Additional Inherited Members
Static Protected Attributes inherited from vtkParallelRenderManager
static bool	DefaultRenderEventPropagation

Detailed Description

An object to control sort-last parallel rendering.

vtkCompositeRenderManager is a subclass of vtkParallelRenderManager that uses compositing to do parallel rendering. This class has replaced vtkCompositeManager.