Ogre::PSSMShadowCameraSetup Class Reference

Parallel Split Shadow Map (PSSM) shadow camera setup. More...

#include <OgreShadowCameraSetupPSSM.h>

Inheritance diagram for Ogre::PSSMShadowCameraSetup:

Public Types
typedef vector< Real >::type	SplitPointList

Public Member Functions
	PSSMShadowCameraSetup ()
	Constructor, defaults to 3 splits.
	~PSSMShadowCameraSetup () override
void	calculateSplitPoints (uint splitCount, Real nearDist, Real farDist, Real lambda=Real(0.95), Real blend=Real(0.125), Real fade=Real(0.313))
	Calculate a new splitting scheme.
uint32	getNumStableSplits () const
void	getShadowCamera (const Ogre::SceneManager *sm, const Ogre::Camera *cam, const Ogre::Light *light, Ogre::Camera *texCam, size_t iteration, const Vector2 &viewportRealSize) const override
	Returns a LiSPSM shadow camera with PSSM splits base on iteration.
const SplitPointList &	getSplitBlendPoints () const
	Returns the calculated split blend points.
uint	getSplitCount () const
	Get the number of splits.
const Real &	getSplitFadePoint () const
	Returns the calculated split fade point.
Real	getSplitPadding () const
	Get the padding factor to apply to the near & far distances when matching up splits to one another, to avoid 'cracks'.
const SplitPointList &	getSplitPoints () const
	Returns the calculated split points.
void	setNumStableSplits (uint32 numStableSplits)
	PSSM tends to be very unstable to camera rotation changes.
void	setOptimalAdjustFactor (size_t splitIndex, Real factor)
	Set the LiSPSM optimal adjust factor for a given split (call after configuring splits).
void	setSplitPadding (Real pad)
	Set the padding factor to apply to the near & far distances when matching up splits to one another, to avoid 'cracks'.
void	setSplitPoints (const SplitPointList &newSplitPoints, Real blend=Real(0.125), Real fade=Real(0.313))
	Manually configure a new splitting scheme.
Public Member Functions inherited from Ogre::FocusedShadowCameraSetup
	FocusedShadowCameraSetup ()
	Default constructor.
	~FocusedShadowCameraSetup () override
	Default destructor.
Real	getXYPadding () const
	See FocusedShadowCameraSetup::setXYPadding.
void	setXYPadding (Real pad)
	setXYPadding FocusedShadowCameraSetup tries to make the shadow mapping camera fit the casters as tight as possible to minimize aliasing.
Public Member Functions inherited from Ogre::DefaultShadowCameraSetup
	DefaultShadowCameraSetup ()
	Default constructor.
	~DefaultShadowCameraSetup () override
	Destructor.
Public Member Functions inherited from Ogre::ShadowCameraSetup
	ShadowCameraSetup ()
virtual	~ShadowCameraSetup ()
	Need virtual destructor in case subclasses use it.
Real	getMaxDistance () const
Real	getMinDistance () const

Additional Inherited Members
Static Public Member Functions inherited from Ogre::ShadowCameraSetup
static void	setUseEsm (bool useEsm)

Detailed Description

Parallel Split Shadow Map (PSSM) shadow camera setup.

Remarks

A PSSM shadow system uses multiple shadow maps per light and maps each texture into a region of space, progressing away from the camera. As such it is most appropriate for directional light setups. This particular version also uses LiSPSM projection for each split to maximise the quality.

Note

Because PSSM uses multiple shadow maps per light, you will need to increase the number of shadow textures available (via SceneManager) to match the number of shadow maps required (default is 3 per light).

Member Typedef Documentation

SplitPointList

typedef vector<Real>::type Ogre::PSSMShadowCameraSetup::SplitPointList

Constructor & Destructor Documentation

PSSMShadowCameraSetup()

Ogre::PSSMShadowCameraSetup::PSSMShadowCameraSetup

(

)

Constructor, defaults to 3 splits.

~PSSMShadowCameraSetup()

Ogre::PSSMShadowCameraSetup::~PSSMShadowCameraSetup ( )

override

Member Function Documentation

calculateSplitPoints()

void Ogre::PSSMShadowCameraSetup::calculateSplitPoints	(	uint	splitCount,
		Real	nearDist,
		Real	farDist,
		Real	lambda = Real(0.95),
		Real	blend = Real(0.125),
		Real	fade = Real(0.313)
	)

Calculate a new splitting scheme.

Parameters

splitCount	The number of splits to use
nearDist	The near plane to use for the first split
farDist	The far plane to use for the last split
lambda	Factor to use to reduce the split size
blend	Factor to use to reduce the split seams
fade	Factor to use to fade out the last split

getNumStableSplits()

uint32 Ogre::PSSMShadowCameraSetup::getNumStableSplits ( ) const

inline

getShadowCamera()

void Ogre::PSSMShadowCameraSetup::getShadowCamera ( const Ogre::SceneManager *  sm, const Ogre::Camera *  cam, const Ogre::Light *  light, Ogre::Camera *  texCam, size_t  iteration, const Vector2 &  viewportRealSize  ) const

overridevirtual

Returns a LiSPSM shadow camera with PSSM splits base on iteration.

Reimplemented from Ogre::FocusedShadowCameraSetup.

getSplitBlendPoints()

const SplitPointList & Ogre::PSSMShadowCameraSetup::getSplitBlendPoints ( ) const

inline

Returns the calculated split blend points.

getSplitCount()

uint Ogre::PSSMShadowCameraSetup::getSplitCount ( ) const

inline

Get the number of splits.

getSplitFadePoint()

const Real & Ogre::PSSMShadowCameraSetup::getSplitFadePoint ( ) const

inline

Returns the calculated split fade point.

getSplitPadding()

Real Ogre::PSSMShadowCameraSetup::getSplitPadding ( ) const

inline

Get the padding factor to apply to the near & far distances when matching up splits to one another, to avoid 'cracks'.

getSplitPoints()

const SplitPointList & Ogre::PSSMShadowCameraSetup::getSplitPoints ( ) const

inline

Returns the calculated split points.

setNumStableSplits()

void Ogre::PSSMShadowCameraSetup::setNumStableSplits ( uint32  numStableSplits )

inline

PSSM tends to be very unstable to camera rotation changes.

Rotate the camera around and the shadow mapping artifacts keep changing.

setNumStableSplits allows you to fix that problem; by switching to ConcentricShadowCamera for the first N splits you specify; while the rest of the splits will use FocusedShadowCameraSetup.

We achieve rotation stability by sacrificing overall quality. Using ConcentricShadowCamera on higher splits means sacrificing exponentially a lot more quality (and even performance); thus the recommended values are numStableSplits = 1 or numStableSplits = 2

The default is numStableSplits = 0 which disables the feature

setOptimalAdjustFactor()

void Ogre::PSSMShadowCameraSetup::setOptimalAdjustFactor	(	size_t	splitIndex,
		Real	factor
	)

Set the LiSPSM optimal adjust factor for a given split (call after configuring splits).

setSplitPadding()

void Ogre::PSSMShadowCameraSetup::setSplitPadding ( Real  pad )

inline

Set the padding factor to apply to the near & far distances when matching up splits to one another, to avoid 'cracks'.

setSplitPoints()

void Ogre::PSSMShadowCameraSetup::setSplitPoints	(	const SplitPointList &	newSplitPoints,
		Real	blend = Real(0.125),
		Real	fade = Real(0.313)
	)

Manually configure a new splitting scheme.

Parameters

newSplitPoints	A list which is splitCount + 1 entries long, containing the split points. The first value is the near point, the last value is the far point, and each value in between is both a far point of the previous split, and a near point for the next one.
blend	Factor to use to reduce the split seams.
fade	Factor to use to fade out the last split.

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

• OgreShadowCameraSetupPSSM.h