The ScreenRatioPixelCountLodStrategy class Implement a strategy which calculates LOD ratios based on coverage in screen ratios in the range [-1.0; 0.0] where -1.0 means the object is covering the whole screen and 0 covering almost nothing in the screen (very tiny). More...

#include <OgrePixelCountLodStrategy.h>

Inheritance diagram for Ogre::ScreenRatioPixelCountLodStrategy:

Public Member Functions
	ScreenRatioPixelCountLodStrategy ()
	Default constructor.

Real	getValueImpl (const MovableObject movableObject, const Camera camera) const override
	Compute the LOD value for a given movable object relative to a given camera.

void	lodUpdateImpl (const size_t numNodes, ObjectData t, const Camera *camera, Real bias) const override

Public Member Functions inherited from Ogre::PixelCountLodStrategyBase
	PixelCountLodStrategyBase (const String &name)
	Default constructor.

Real	getBaseValue () const override
	Get the value of the first (highest) level of detail.

Real	transformBias (Real factor) const override
	Transform LOD bias so it only needs to be multiplied by the LOD value.

Real	transformUserValue (Real userValue) const override
	Transform user supplied value to internal value.

Public Member Functions inherited from Ogre::LodStrategy
	LodStrategy (const String &name)
	Constructor accepting name.

virtual	~LodStrategy ()
	Virtual destructor.

const String &	getName () const
	Get the name of this strategy.

Real	getValue (const MovableObject movableObject, const Camera camera) const
	Compute the LOD value for a given movable object relative to a given camera.

Public Member Functions inherited from Ogre::Singleton< ScreenRatioPixelCountLodStrategy >
	Singleton ()

	~Singleton ()

Static Public Member Functions
static ScreenRatioPixelCountLodStrategy &	getSingleton ()
	Override standard Singleton retrieval.

static ScreenRatioPixelCountLodStrategy *	getSingletonPtr ()
	Override standard Singleton retrieval.

Static Public Member Functions inherited from Ogre::LodStrategy
static void	lodSet (ObjectData &t, Real lodValues[ARRAY_PACKED_REALS])

Static Public Member Functions inherited from Ogre::Singleton< ScreenRatioPixelCountLodStrategy >
static ScreenRatioPixelCountLodStrategy &	getSingleton ()

static ScreenRatioPixelCountLodStrategy *	getSingletonPtr ()

Detailed Description

The ScreenRatioPixelCountLodStrategy class Implement a strategy which calculates LOD ratios based on coverage in screen ratios in the range [-1.0; 0.0] where -1.0 means the object is covering the whole screen and 0 covering almost nothing in the screen (very tiny).

Note however that:

Values beyond -1.0 are possible (it just means the object is bigger than the screen)
It's an approximation

Constructor & Destructor Documentation

◆ ScreenRatioPixelCountLodStrategy()

Ogre::ScreenRatioPixelCountLodStrategy::ScreenRatioPixelCountLodStrategy ( )

Default constructor.

Member Function Documentation

◆ getSingleton()

static ScreenRatioPixelCountLodStrategy & Ogre::ScreenRatioPixelCountLodStrategy::getSingleton ( )

static

Override standard Singleton retrieval.

Remarks: Why do we do this? Well, it's because the Singleton implementation is in a .h file, which means it gets compiled into anybody who includes it. This is needed for the Singleton template to work, but we actually only want it compiled into the implementation of the class based on the Singleton, not all of them. If we don't change this, we get link errors when trying to use the Singleton-based class from an outside dll.

: This method just delegates to the template version anyway, but the implementation stays in this single compilation unit, preventing link errors.

◆ getSingletonPtr()

static ScreenRatioPixelCountLodStrategy * Ogre::ScreenRatioPixelCountLodStrategy::getSingletonPtr ( )

static

Override standard Singleton retrieval.

Remarks: Why do we do this? Well, it's because the Singleton implementation is in a .h file, which means it gets compiled into anybody who includes it. This is needed for the Singleton template to work, but we actually only want it compiled into the implementation of the class based on the Singleton, not all of them. If we don't change this, we get link errors when trying to use the Singleton-based class from an outside dll.

: This method just delegates to the template version anyway, but the implementation stays in this single compilation unit, preventing link errors.

◆ getValueImpl()

Real Ogre::ScreenRatioPixelCountLodStrategy::getValueImpl	(	const MovableObject *	movableObject,
		const Camera *	camera
	)		const

overridevirtual

Compute the LOD value for a given movable object relative to a given camera.

Implements Ogre::LodStrategy.

◆ lodUpdateImpl()

void Ogre::ScreenRatioPixelCountLodStrategy::lodUpdateImpl	(	const size_t	numNodes,
		ObjectData	t,
		const Camera *	camera,
		Real	bias
	)		const