Representation of a dynamic light source in the scene. More...

#include <OgreLight.h>

Inheritance diagram for Ogre::Light:

Public Types
enum	LightTypes { LT_DIRECTIONAL = 0 , LT_POINT = 1 , LT_SPOTLIGHT = 2 , LT_VPL = 3 , MAX_FORWARD_PLUS_LIGHTS = 4 , LT_AREA_APPROX = 4 , LT_AREA_LTC = 5 , NUM_LIGHT_TYPES }
	Defines the type of light. More...

Public Types inherited from Ogre::MovableObject
typedef FastArray< MovableObject * >	MovableObjectArray

Public Types inherited from Ogre::TextureGpuListener
enum	Reason { Unknown , FromStorageToSysRam , FromSysRamToStorage , GainedResidency , LostResidency , PoolTextureSlotChanged , ResidentToSysRamSync , MetadataCacheOutOfDate , ExceptionThrown , FsaaSettingAlteredByApi , ReadyForRendering , Deleted }

Public Member Functions
	Light (IdType id, ObjectMemoryManager objectMemoryManager, SceneManager manager)
	Normal constructor.

	~Light () override
	Standard destructor.

void	_calcTempSquareDist (const Vector3 &worldPos)
	Internal method for calculating current squared distance from some world position.

Real	_deriveShadowFarClipDistance (const Camera *maincam) const
	Derive a shadow camera far distance from either the light, or from the main camera if the light doesn't have its own setting.

Real	_deriveShadowNearClipDistance (const Camera *maincam) const
	Derive a shadow camera near distance from either the light, or from the main camera if the light doesn't have its own setting.

bool	_getOwnShadowFarDistance () const

void	_setLightProfileIdx (uint16 profileIdx)

virtual void	_updateCustomGpuParameter (uint16 paramIndex, const GpuProgramParameters_AutoConstantEntry &constantEntry, GpuProgramParameters *params) const
	Update a custom GpuProgramParameters constant which is derived from information only this Light knows.

void	_updateRenderQueue (RenderQueue queue, Camera camera, const Camera *lodCamera) override
	Internal method by which the movable object must add Renderable subclass instances to the rendering queue.

AnimableValuePtr	createAnimableValue (const String &valueName) override
	Create a reference-counted AnimableValuePtr for the named value.

bool	getAffectParentNode () const

Vector4	getAs4DVector () const
	Tells this object whether to be visible or not, if it has a renderable component.

Real	getAttenuationConstant () const
	Returns the constant factor in the attenuation formula.

Real	getAttenuationLinear () const
	Returns the linear factor in the attenuation formula.

Real	getAttenuationQuadric () const
	Returns the quadric factor in the attenuation formula.

Real	getAttenuationRange () const
	Returns the absolute upper range of the light.

const Vector4 &	getCustomParameter (uint16 index) const
	Gets the custom value associated with this Light at the given index.

const Vector4 *	getCustomParameterNoThrow (uint16 index) const

Vector3	getDerivedDirection () const
	Retrieves the direction of the light including any transform from nodes it is attached to.

Vector3	getDerivedDirectionUpdated () const

Vector2	getDerivedRectSize () const

const ColourValue &	getDiffuseColour () const
	Returns the colour of the diffuse light given off by this light source (see setDiffuseColour for more info).

Vector3	getDirection () const
	Returns the light's direction.

bool	getDoubleSided () const

uint16	getLightProfileIdx () const

const String &	getMovableType () const override
	Returns the type name of this object.

Real	getPowerScale () const
	Set the scaling factor which indicates the relative power of a light.

const Vector2 &	getRectSize () const

Real	getShadowFarClipDistance () const
	Get the far clip plane distance to be used by the shadow camera, if this light casts texture shadows.

Real	getShadowFarDistance () const
	Gets the maximum distance away from the camera that shadows by this light will be visible.

Real	getShadowFarDistanceSquared () const

Real	getShadowNearClipDistance () const
	Get the near clip plane distance to be used by the shadow camera, if this light casts texture shadows.

const ColourValue &	getSpecularColour () const
	Returns the colour of specular light given off by this light source.

Real	getSpotlightFalloff () const
	Returns the falloff between the inner and outer cones of the spotlight.

const Radian &	getSpotlightInnerAngle () const
	Returns the angle covered by the spotlights inner cone.

Real	getSpotlightNearClipDistance () const
	Get the near clip plane distance to be used by spotlights that use light clipping.

const Radian &	getSpotlightOuterAngle () const
	Returns the angle covered by the spotlights outer cone.

Real	getSpotlightTanHalfAngle () const

TextureGpu *	getTexture () const

LightTypes	getType () const
	Returns the light type.

bool	isInLightRange (const Ogre::AxisAlignedBox &container) const
	Check whether a bounding box is included in the lighted area of the light.

bool	isInLightRange (const Ogre::Sphere &sphere) const
	Check whether a sphere is included in the lighted area of the light.

void	notifyTextureChanged (TextureGpu texture, TextureGpuListener::Reason reason, void extraData) override
	Called when a TextureGpu changed in a way that affects how it is displayed:

void	resetShadowFarDistance ()
	Tells the light to use the shadow far distance of the SceneManager.

void	setAffectParentNode (bool bAffect)
	A Light must always have a Node attached to it.

void	setAttenuation (Real range, Real constant, Real linear, Real quadratic)
	Sets the attenuation parameters of the light source i.e.

void	setAttenuationBasedOnRadius (Real radius, Real lumThreshold)
	Sets the attenuation parameters (range, constant, linear & quadratic,.

void	setCustomParameter (uint16 index, const Vector4 &value)
	Sets a custom parameter for this Light, which may be used to drive calculations for this specific Renderable, like GPU program parameters.

void	setDiffuseColour (const ColourValue &colour)
	Sets the colour of the diffuse light given off by this source.

void	setDiffuseColour (Real red, Real green, Real blue)
	Sets the colour of the diffuse light given off by this source.

void	setDirection (const Vector3 &vec)
	Sets the direction in which a light points.

void	setDoubleSided (bool bDoubleSided)
	For area lights and custom 2d shapes, specifies whether the light lits in both directions (positive & negative sides of the plane) or if only towards one.

void	setPowerScale (Real power)
	Set a scaling factor to indicate the relative power of a light.

void	setRectSize (Vector2 rectSize)
	For custom 2D shape and area lights, sets the dimensions of the rectangle.

void	setRenderQueueGroup (uint8 queueID) override
	Overload to avoid it. Light::setType uses the RenderQueue ID to classify lights per type.

void	setShadowFarClipDistance (Real farClip)
	Set the far clip plane distance to be used by the shadow camera, if this light casts texture shadows.

void	setShadowFarDistance (Real distance)
	Sets the maximum distance away from the camera that shadows by this light will be visible.

void	setShadowNearClipDistance (Real nearClip)
	Set the near clip plane distance to be used by the shadow camera, if this light casts texture shadows.

void	setSpecularColour (const ColourValue &colour)
	Sets the colour of the specular light given off by this source.

void	setSpecularColour (Real red, Real green, Real blue)
	Sets the colour of the specular light given off by this source.

void	setSpotlightFalloff (Real val)
	Sets the falloff between the inner and outer cones of the spotlight.

void	setSpotlightInnerAngle (const Radian &val)
	Sets the angle covered by the spotlights inner cone.

void	setSpotlightNearClipDistance (Real nearClip)
	Set the near clip plane distance to be used by spotlights that use light clipping, allowing you to render spots as if they start from further down their frustum.

void	setSpotlightOuterAngle (const Radian &val)
	Sets the angle covered by the spotlights outer cone.

void	setSpotlightRange (const Radian &innerAngle, const Radian &outerAngle, Real falloff=1.0)
	Sets the range of a spotlight, i.e.

void	setTexture (TextureGpu *texture)
	Sets a textured for types of light that support it.

void	setTextureRaw (TextureGpu *texture, uint32 sliceIdx)

void	setType (LightTypes type)
	Sets the type of light - see LightTypes for more info.

Public Member Functions inherited from Ogre::MovableObject
	MovableObject (IdType id, ObjectMemoryManager objectMemoryManager, SceneManager manager, uint8 renderQueueId)
	Constructor.

	MovableObject (ObjectData *objectDataPtrs)
	Don't use this constructor unless you know what you're doing.

virtual	~MovableObject ()
	Virtual destructor - read Scott Meyers if you don't know why this is needed.

LightList *	_getLightList ()
	Returns a pointer to the current list of lights for this object.

SceneManager *	_getManager () const
	Get the manager of this object, if any (internal use only)

ObjectData &	_getObjectData ()
	Returns a direct access to the ObjectData state.

const Matrix4 &	_getParentNodeFullTransform () const
	Returns the full transformation of the parent sceneNode or the attachingPoint node.

virtual void	_notifyAttached (Node *parent)
	Internal method called to notify the object that it has been attached to a node.

void	_notifyManager (SceneManager *man)
	Notify the object of it's manager (internal use only)

virtual void	_notifyParentNodeMemoryChanged ()

virtual void	_notifyStaticDirty () const
	Called by SceneManager when it is telling we're a static MovableObject being dirty Don't call this directly.

virtual void	_releaseManualHardwareResources ()
	Notifies the movable object that hardware resources were lost.

virtual void	_restoreManualHardwareResources ()
	Notifies the movable object that hardware resources should be restored.

void	addQueryFlags (uint32 flags)
	As setQueryFlags, except the flags passed as parameters are appended to the existing flags on this object.

void	addVisibilityFlags (uint32 flags)
	As setVisibilityFlags, except the flags passed as parameters are appended to the existing flags on this object.

void	detachFromParent ()
	Detaches an object from a parent SceneNode if attached.

RealAsUint	getCachedDistanceToCamera () const
	Returns the distance to camera as calculated in cullFrustum()

Real	getCachedDistanceToCameraAsReal () const
	Returns the distance to camera as calculated in cullFrustum()

bool	getCastShadows () const
	Returns whether shadow casting is enabled for this object.

unsigned char	getCurrentMeshLod () const

uint32	getLightMask () const
	Get a bitwise mask which will filter the lights affecting this object.

Listener *	getListener () const
	Gets the current listener for this object.

Aabb	getLocalAabb () const
	Retrieves the local axis-aligned bounding box for this object.

float	getLocalRadius () const
	See getLocalAabb and getWorldRadius.

const String &	getName () const
	Returns the name of this object.

Node *	getParentNode () const
	Returns the node to which this object is attached.

SceneNode *	getParentSceneNode () const

uint32	getQueryFlags () const
	Returns the query flags relevant for this object.

Real	getRenderingDistance () const
	Gets the distance at which batches are no longer rendered.

Real	getRenderingMinPixelSize () const
	Returns the minimum pixel size an object needs to be in both screen axes in order to be rendered.

uint8	getRenderQueueGroup () const
	Gets the queue group for this entity, see setRenderQueueGroup for full details.

Real	getShadowRenderingDistance () const
	Gets the distance at which batches are no longer casting shadows.

SkeletonInstance *	getSkeletonInstance () const

UserObjectBindings &	getUserObjectBindings ()
	Return an instance of user objects binding associated with this class.

const UserObjectBindings &	getUserObjectBindings () const
	Return an instance of user objects binding associated with this class.

uint32	getVisibilityFlags () const
	Returns the visibility flags relevant for this object.

bool	getVisible () const
	Gets this object whether to be visible or not, if it has a renderable component.

Aabb	getWorldAabb () const
	Gets the axis aligned box in world space.

Aabb	getWorldAabbUpdated ()
	Gets the axis aligned box in world space.

float	getWorldRadius () const
	Gets the bounding Radius scaled by max( scale.x, scale.y, scale.z ).

float	getWorldRadiusUpdated ()
	Gets the bounding Radius scaled by max( scale.x, scale.y, scale.z ).

virtual void	instanceBatchCullFrustumThreaded (const Frustum frustum, const Camera lodCamera, uint32 combinedVisibilityFlags)

bool	isAttached () const
	Returns true if this object is attached to a Node.

bool	isStatic () const
	Checks whether this MovableObject is static.

bool	isVisible () const
	Returns whether or not this object is supposed to be visible or not.

const LightList &	queryLights () const
	Gets a list of lights, ordered relative to how close they are to this movable object.

void	removeQueryFlags (uint32 flags)
	As setQueryFlags, except the flags passed as parameters are removed from the existing flags on this object.

void	removeVisibilityFlags (uint32 flags)
	As setVisibilityFlags, except the flags passed as parameters are removed from the existing flags on this object.

void	setCastShadows (bool enabled)
	Sets whether or not this object will cast shadows.

void	setLightMask (uint32 lightMask)
	Set a bitwise mask which will filter the lights affecting this object.

void	setListener (Listener *listener)
	Sets a listener for this object.

void	setLocalAabb (const Aabb box)
	Sets the local axis-aligned bounding box for this object.

void	setName (const String &name)
	Sets a custom name for this node.

void	setQueryFlags (uint32 flags)
	Sets the query flags for this object.

void	setRenderingDistance (Real dist)
	Sets the distance at which the object is no longer rendered.

void	setRenderingMinPixelSize (Real pixelSize)
	Sets the minimum pixel size an object needs to be in both screen axes in order to be rendered.

void	setShadowRenderingDistance (Real dist)
	Sets the distance at which the object is no longer casting shadows.

bool	setStatic (bool bStatic)
	Turns this Node into static or dynamic.

void	setVisibilityFlags (uint32 flags)
	Sets the visibility flags for this object.

void	setVisible (bool visible)
	Tells this object whether to be visible or not, if it has a renderable component.

Public Member Functions inherited from Ogre::AnimableObject
	AnimableObject ()

virtual	~AnimableObject ()

const StringVector &	getAnimableValueNames () const
	Gets a list of animable value names for this object.

Public Member Functions inherited from Ogre::IdObject
	IdObject (IdType id)
	We don't call generateNewId() here, to prevent objects in the stack (i.e.

IdType	getId () const
	Get the unique id of this object.

bool	operator() (const IdObject &left, const IdObject &right)

bool	operator() (const IdObject left, const IdObject right)

Public Member Functions inherited from Ogre::TextureGpuListener
virtual	~TextureGpuListener ()

virtual bool	shouldStayLoaded (TextureGpu *texture)
	Return true if this TextureGpu should likely stay loaded or else graphical changes could occur.

Public Attributes
uint16	mTexLightMaskDiffuseMipStart
	Control the start of mip level for diffuse component for area lights The value is UNORM, thus the range [0; 65535] maps to [0; 1] where 1.0 means to use the highest mip level, and 0 the lowest mip.

uint16	mTextureLightMaskIdx

Real	tempSquareDist
	Temp tag used for sorting.

Public Attributes inherited from Ogre::MovableObject
size_t	mGlobalIndex
	Index in the vector holding this MO reference (could be our parent node, or a global array tracking all movable objecst to avoid memory leaks).

size_t	mParentIndex
	Index in the vector holding this MO reference (could be our parent node, or a global array tracking all movable objecst to avoid memory leaks).

RenderableArray	mRenderables

Additional Inherited Members
Static Public Member Functions inherited from Ogre::MovableObject
static void	buildLightList (const size_t numNodes, ObjectData t, const LightListInfo &globalLightList)

static void	calculateCastersBox (const size_t numNodes, ObjectData t, uint32 sceneVisibilityFlags, AxisAlignedBox *outBox)

static void	cullFrustum (const size_t numNodes, ObjectData t, const Camera frustum, uint32 sceneVisibilityFlags, MovableObjectArray &outCulledObjects, const Camera lodCamera)

static void	cullLights (const size_t numNodes, ObjectData t, uint32 sceneLightMask, LightListInfo &outGlobalLightList, const FrustumVec &frustums, const FrustumVec &cubemapFrustums)
	See SceneManager::cullLights & see MovableObject::cullFrustum.

static uint32	getDefaultLightMask ()
	Get the default light mask for all future MovableObject instances.

static uint32	getDefaultQueryFlags ()
	Get the default query flags for all future MovableObject instances.

static uint32	getDefaultVisibilityFlags ()
	Get the default visibility flags for all future MovableObject instances.

static void	setDefaultLightMask (uint32 mask)
	Set the default light mask for all future MovableObject instances.

static void	setDefaultQueryFlags (uint32 flags)
	Set the default query flags for all future MovableObject instances.

static void	setDefaultVisibilityFlags (uint32 flags)
	Set the default visibility flags for all future MovableObject instances.

static void	updateAllBounds (const size_t numNodes, ObjectData t)

Static Public Attributes inherited from Ogre::MovableObject
static const FastArray< Real >	c_DefaultLodMesh

Detailed Description

Representation of a dynamic light source in the scene.

Remarks: Lights are added to the scene like any other object. They contain various parameters like type, position, attenuation (how light intensity fades with distance), colour etc.

: The defaults when a light is created is pure white diffuse light, with no attenuation (does not decrease with distance) and a range of 1000 world units.

: Lights are created by using the SceneManager::createLight method. Starting Ogre 2.0 all Lights must be associated to a SceneNode in order to work; which holds the position and direction. Light::setDirection and Light::getDirection will redirect to the SceneNode and assert or crash if not attached to one.

: Remember also that dynamic lights rely on modifying the colour of vertices based on the position of the light compared to an object's vertex normals. Dynamic lighting will only look good if the object being lit has a fair level of tessellation and the normals are properly set. This is particularly true for the spotlight which will only look right on highly tessellated models. In the future OGRE may be extended for certain scene types so an alternative to the standard dynamic lighting may be used, such as dynamic lightmaps.

Member Enumeration Documentation

◆ LightTypes

enum Ogre::Light::LightTypes

Defines the type of light.

Enumerator
LT_DIRECTIONAL	Directional lights simulate parallel light beams from a distant source, hence have direction but no position.
LT_POINT	Point light sources give off light equally in all directions, so require only position not direction.
LT_SPOTLIGHT	Spotlights simulate a cone of light from a source so require position and direction, plus extra values for falloff.
LT_VPL	Virtual point lights, used for Instant Radiosity (Global Illumination fake / approximation)
MAX_FORWARD_PLUS_LIGHTS
LT_AREA_APPROX	Non-PBR version of Area lights. Not an accurate approximation, but they're flexible, useful & cheap. They aren't physically correct at all.
LT_AREA_LTC	PBR version of Area lights using Linearly Transformed Cosines as researched by Eric Heitz, Jonathan Dupuy, Stephen Hill and David Neubelt. It's slower than LT_AREA_APPROX, and does not currently support textures. However it's physically accurate.
NUM_LIGHT_TYPES

Constructor & Destructor Documentation

◆ Light()

Ogre::Light::Light	(	IdType	id,
		ObjectMemoryManager *	objectMemoryManager,
		SceneManager *	manager
	)

Normal constructor.

Should not be called directly, but rather the SceneManager::createLight method should be used.

◆ ~Light()

Ogre::Light::~Light ( )

override

Standard destructor.

Member Function Documentation

◆ _calcTempSquareDist()

void Ogre::Light::_calcTempSquareDist ( const Vector3 & worldPos )

Internal method for calculating current squared distance from some world position.

◆ _deriveShadowFarClipDistance()

Real Ogre::Light::_deriveShadowFarClipDistance ( const Camera * maincam ) const

Derive a shadow camera far distance from either the light, or from the main camera if the light doesn't have its own setting.

◆ _deriveShadowNearClipDistance()

Real Ogre::Light::_deriveShadowNearClipDistance ( const Camera * maincam ) const

Derive a shadow camera near distance from either the light, or from the main camera if the light doesn't have its own setting.

◆ _getOwnShadowFarDistance()

bool Ogre::Light::_getOwnShadowFarDistance ( ) const

◆ _setLightProfileIdx()

void Ogre::Light::_setLightProfileIdx ( uint16 profileIdx )

inline

◆ _updateCustomGpuParameter()

virtual void Ogre::Light::_updateCustomGpuParameter	(	uint16	paramIndex,
		const GpuProgramParameters_AutoConstantEntry &	constantEntry,
		GpuProgramParameters *	params
	)		const

virtual

Update a custom GpuProgramParameters constant which is derived from information only this Light knows.

Remarks: This method allows a Light to map in a custom GPU program parameter based on it's own data. This is represented by a GPU auto parameter of ACT_LIGHT_CUSTOM, and to allow there to be more than one of these per Light, the 'data' field on the auto parameter will identify which parameter is being updated and on which light. The implementation of this method must identify the parameter being updated, and call a 'setConstant' method on the passed in GpuProgramParameters object.

: You do not need to override this method if you're using the standard sets of data associated with the Renderable as provided by setCustomParameter and getCustomParameter. By default, the implementation will map from the value indexed by the 'constantEntry.data' parameter to a value previously set by setCustomParameter. But custom Renderables are free to override this if they want, in any case.

Parameters

paramIndex	The index of the constant being updated
constantEntry	The auto constant entry from the program parameters
params	The parameters object which this method should call to set the updated parameters.

◆ _updateRenderQueue()

void Ogre::Light::_updateRenderQueue	(	RenderQueue *	queue,
		Camera *	camera,
		const Camera *	lodCamera
	)

inlineoverridevirtual

Internal method by which the movable object must add Renderable subclass instances to the rendering queue.

Remarks: The engine will call this method when this object is to be rendered. The object must then create one or more Renderable subclass instances which it places on the passed in Queue for rendering.

Reimplemented from Ogre::MovableObject.

◆ createAnimableValue()

AnimableValuePtr Ogre::Light::createAnimableValue ( const String & valueName )

overridevirtual

Create a reference-counted AnimableValuePtr for the named value.

Remarks: You can use the returned object to animate a value on this object, using AnimationTrack. Subclasses must override this if they wish to support animation of their values.

Reimplemented from Ogre::AnimableObject.

◆ getAffectParentNode()

bool Ogre::Light::getAffectParentNode ( ) const

inline

◆ getAs4DVector()

Vector4 Ogre::Light::getAs4DVector ( ) const

Tells this object whether to be visible or not, if it has a renderable component.

Note: An alternative approach of making an object invisible is to detach it from it's SceneNode, or to remove the SceneNode entirely. Detaching a node means that structurally the scene graph changes. Once this change has taken place, the objects / nodes that have been removed have less overhead to the visibility detection pass than simply making the object invisible, so if you do this and leave the objects out of the tree for a long time, it's faster. However, the act of detaching / reattaching nodes is in itself more expensive than setting an object visibility flag, since in the latter case structural changes are not made. Therefore, small or frequent visibility changes are best done using this method; large or more longer term changes are best done by detaching.

Remarks: Although lights themselves are not 'visible', setting a light to invisible means it no longer affects the scene. Gets the details of this light as a 4D vector.; Getting details of a light as a 4D vector can be useful for doing general calculations between different light types; for example the vector can represent both position lights (w=1.0f) and directional lights (w=0.0f) and be used in the same calculations.

◆ getAttenuationConstant()

Real Ogre::Light::getAttenuationConstant ( ) const

inline

Returns the constant factor in the attenuation formula.

◆ getAttenuationLinear()

Real Ogre::Light::getAttenuationLinear ( ) const

inline

Returns the linear factor in the attenuation formula.

◆ getAttenuationQuadric()

Real Ogre::Light::getAttenuationQuadric ( ) const

inline

Returns the quadric factor in the attenuation formula.

◆ getAttenuationRange()

Real Ogre::Light::getAttenuationRange ( ) const

inline

Returns the absolute upper range of the light.

◆ getCustomParameter()

const Vector4 & Ogre::Light::getCustomParameter ( uint16 index ) const

Gets the custom value associated with this Light at the given index.

Parameters

index Index of the parameter to retrieve

See also: setCustomParameter for full details.

◆ getCustomParameterNoThrow()

const Vector4 * Ogre::Light::getCustomParameterNoThrow ( uint16 index ) const

◆ getDerivedDirection()

Vector3 Ogre::Light::getDerivedDirection ( ) const

Retrieves the direction of the light including any transform from nodes it is attached to.

◆ getDerivedDirectionUpdated()

Vector3 Ogre::Light::getDerivedDirectionUpdated ( ) const

◆ getDerivedRectSize()

Vector2 Ogre::Light::getDerivedRectSize ( ) const

◆ getDiffuseColour()

const ColourValue & Ogre::Light::getDiffuseColour ( ) const

inline

Returns the colour of the diffuse light given off by this light source (see setDiffuseColour for more info).

◆ getDirection()

Vector3 Ogre::Light::getDirection ( ) const

Returns the light's direction.

Remarks: Applicable only to the spotlight and directional light types. Try to cache the value instead of calling it multiple times in the same scope

◆ getDoubleSided()

bool Ogre::Light::getDoubleSided ( ) const

inline

◆ getLightProfileIdx()

uint16 Ogre::Light::getLightProfileIdx ( ) const

inline

◆ getMovableType()

const String & Ogre::Light::getMovableType ( ) const

overridevirtual

Returns the type name of this object.

Implements Ogre::MovableObject.

◆ getPowerScale()

Real Ogre::Light::getPowerScale ( ) const

inline

Set the scaling factor which indicates the relative power of a light.

◆ getRectSize()

const Vector2 & Ogre::Light::getRectSize ( ) const

inline

◆ getShadowFarClipDistance()

Real Ogre::Light::getShadowFarClipDistance ( ) const

inline

Get the far clip plane distance to be used by the shadow camera, if this light casts texture shadows.

Remarks: May be zero if the light doesn't have it's own far distance set; use _deriveShadowfarDistance for a version guaranteed to give a result.

◆ getShadowFarDistance()

Real Ogre::Light::getShadowFarDistance ( ) const

Gets the maximum distance away from the camera that shadows by this light will be visible.

◆ getShadowFarDistanceSquared()

Real Ogre::Light::getShadowFarDistanceSquared ( ) const

◆ getShadowNearClipDistance()

Real Ogre::Light::getShadowNearClipDistance ( ) const

inline

Get the near clip plane distance to be used by the shadow camera, if this light casts texture shadows.

Remarks: May be zero if the light doesn't have it's own near distance set; use _deriveShadowNearDistance for a version guaranteed to give a result.

◆ getSpecularColour()

const ColourValue & Ogre::Light::getSpecularColour ( ) const

inline

Returns the colour of specular light given off by this light source.

◆ getSpotlightFalloff()

Real Ogre::Light::getSpotlightFalloff ( ) const

inline

Returns the falloff between the inner and outer cones of the spotlight.

◆ getSpotlightInnerAngle()

const Radian & Ogre::Light::getSpotlightInnerAngle ( ) const

inline

Returns the angle covered by the spotlights inner cone.

◆ getSpotlightNearClipDistance()

Real Ogre::Light::getSpotlightNearClipDistance ( ) const

inline

Get the near clip plane distance to be used by spotlights that use light clipping.

◆ getSpotlightOuterAngle()

const Radian & Ogre::Light::getSpotlightOuterAngle ( ) const

inline

Returns the angle covered by the spotlights outer cone.

◆ getSpotlightTanHalfAngle()

Real Ogre::Light::getSpotlightTanHalfAngle ( ) const

inline

◆ getTexture()

TextureGpu * Ogre::Light::getTexture ( ) const

inline

◆ getType()

LightTypes Ogre::Light::getType ( ) const

inline

Returns the light type.

◆ isInLightRange() [1/2]

bool Ogre::Light::isInLightRange ( const Ogre::AxisAlignedBox & container ) const

Check whether a bounding box is included in the lighted area of the light.

Note: The function trades accuracy for efficiency. As a result you may get false-positives (The function should not return any false-negatives).

◆ isInLightRange() [2/2]

bool Ogre::Light::isInLightRange ( const Ogre::Sphere & sphere ) const

Check whether a sphere is included in the lighted area of the light.

Note: The function trades accuracy for efficiency. As a result you may get false-positives (The function should not return any false-negatives).

◆ notifyTextureChanged()

void Ogre::Light::notifyTextureChanged	(	TextureGpu *	texture,
		TextureGpuListener::Reason	reason,
		void *	extraData
	)

overridevirtual

Called when a TextureGpu changed in a way that affects how it is displayed:

TextureGpu::notifyDataIsReady got called (texture is ready to be displayed)
Texture changed residency status.
Texture is being deleted. It won't be a valid pointer after this call.

Implements Ogre::TextureGpuListener.

◆ resetShadowFarDistance()

void Ogre::Light::resetShadowFarDistance ( )

Tells the light to use the shadow far distance of the SceneManager.

◆ setAffectParentNode()

void Ogre::Light::setAffectParentNode ( bool bAffect )

A Light must always have a Node attached to it.

The direction is taken from the node's orientation, and thus setDirection modifies the attached node directly.

: However, when changing the range and the spot falloff; the node is not affected. This is intentional in case you want to create (e.g.) a node for a flashlight, and attach both the flashlight entity and the light to the same node; thus controlling the node moves both the flashlight and its visual effect.

: Despite this, there are cases where you want the changes to this light to be reflected in the parent node: The most common example are light volumes in deferred shading setups, and debug objects.

Remarks: This setting is only useful for non-directional lights. For point lights, the scale is calculated as setSize( range, range, range ) which means a light volume should be a sphere of radius = 1;

: For spot lights, the scale is calc. as setSize( tan( outerAngle * 0.5 * range ), tan( outerAngle * 0.5 * range ), range ); which means a light volume should be a cone with Z = 1, and X & Y = 2

Parameters

bAffect When true, the scene node is affected and modified by changes to range and falloff.

◆ setAttenuation()

void Ogre::Light::setAttenuation	(	Real	range,
		Real	constant,
		Real	linear,
		Real	quadratic
	)

Sets the attenuation parameters of the light source i.e.

how it diminishes with distance.

Remarks: Lights normally get fainter the further they are away. Also, each light is given a maximum range beyond which it cannot affect any objects.

: Light attenuation is not applicable to directional lights since they have an infinite range and constant intensity.

: This follows a standard attenuation approach - see any good 3D text for the details of what they mean since i don't have room here!

Parameters

range	The absolute upper range of the light in world units.
constant	The constant factor in the attenuation formula: 1.0 means never attenuate, 0.0 is complete attenuation.
linear	The linear factor in the attenuation formula: 1 means attenuate evenly over the distance.
quadratic	The quadratic factor in the attenuation formula: adds a curvature to the attenuation formula.

◆ setAttenuationBasedOnRadius()

void Ogre::Light::setAttenuationBasedOnRadius	(	Real	radius,
		Real	lumThreshold
	)

Sets the attenuation parameters (range, constant, linear & quadratic,.

See also: setAttenuation) based on a given radius.

Remarks: The actual attenuation formula is:

1

(distance / radius)² * 0.5 + 0.5

The original formula never ends, that is the range is infinity. This function calculates a range based on "lumThreshold": When the luminosity past certain distance is below the established threshold, the light calculations are cut.

Parameters

radius	The radius of the light. i.e. A light bulb is a couple centimeters, the sun is ~696km; but be sure to be consistent in the unit of measurement you use (i.e. don't use km if your default unit is in meters). Note: Having a radius = 2 means that at distance = 2 the pixel is lit 100% Anything inside that radius (which is supposedly impossible) will have more than 100% light power.
lumThreshold	Value in the range [0; 1) Sets range at which the luminance (in percentage) of a point would go below the threshold. For example lumThreshold = 0 means the attenuation range is infinity; lumThreshold = 1 means the range is set to 0.

: The value you want as threshold to use depends on your HDR pipeline and the power of the light. For example, with a power = 1 in LDR, a lumThreshold < 1 / 255 (roughly 0.00392) is pointless. Past that point the actual RGB value will always be (0, 0, 0). But for an LDR pipeline with a light power of 50, lumThreshold < 1 / (255 * 50) is pointless. For an HDR pipeline, the answer is more faint, as it depends on the threshold of your HDR tonemapping past which it stops adjusting the exposure.

◆ setCustomParameter()

void Ogre::Light::setCustomParameter	(	uint16	index,
		const Vector4 &	value
	)

Sets a custom parameter for this Light, which may be used to drive calculations for this specific Renderable, like GPU program parameters.

Remarks: Calling this method simply associates a numeric index with a 4-dimensional value for this specific Light. This is most useful if the material which this Renderable uses a vertex or fragment program, and has an ACT_LIGHT_CUSTOM parameter entry. This parameter entry can refer to the index you specify as part of this call, thereby mapping a custom parameter for this renderable to a program parameter.

Parameters

index	The index with which to associate the value. Note that this does not have to start at 0, and can include gaps. It also has no direct correlation with a GPU program parameter index - the mapping between the two is performed by the ACT_LIGHT_CUSTOM entry, if that is used.
value	The value to associate.

◆ setDiffuseColour() [1/2]

void Ogre::Light::setDiffuseColour ( const ColourValue & colour )

inline

Sets the colour of the diffuse light given off by this source.

Remarks: Material objects have ambient, diffuse and specular values which indicate how much of each type of light an object reflects. This value denotes the amount and colour of this type of light the light exudes into the scene. The actual appearance of objects is a combination of the two.

: Diffuse light simulates the typical light emanating from light sources and affects the base colour of objects together with ambient light.

◆ setDiffuseColour() [2/2]

void Ogre::Light::setDiffuseColour	(	Real	red,
		Real	green,
		Real	blue
	)

inline

Sets the colour of the diffuse light given off by this source.

Remarks: Material objects have ambient, diffuse and specular values which indicate how much of each type of light an object reflects. This value denotes the amount and colour of this type of light the light exudes into the scene. The actual appearance of objects is a combination of the two.

: Diffuse light simulates the typical light emanating from light sources and affects the base colour of objects together with ambient light.

◆ setDirection()

void Ogre::Light::setDirection ( const Vector3 & vec )

Sets the direction in which a light points.

Remarks: Applicable only to the spotlight and directional light types.

Note: This direction will be concatenated with the parent SceneNode.

◆ setDoubleSided()

void Ogre::Light::setDoubleSided ( bool bDoubleSided )

For area lights and custom 2d shapes, specifies whether the light lits in both directions (positive & negative sides of the plane) or if only towards one.

Parameters

bDoubleSided True to enable. Default: false.

◆ setPowerScale()

void Ogre::Light::setPowerScale ( Real power )

Set a scaling factor to indicate the relative power of a light.

Remarks: This factor is only useful in High Dynamic Range (HDR) rendering. You can bind it to a shader variable to take it into account,

See also: GpuProgramParameters

Parameters

power The power rating of this light, default is 1.0.

◆ setRectSize()

void Ogre::Light::setRectSize ( Vector2 rectSize )

For custom 2D shape and area lights, sets the dimensions of the rectangle.

Parameters

rectSize Dimensions of light area.

◆ setRenderQueueGroup()

void Ogre::Light::setRenderQueueGroup ( uint8 queueID )

overridevirtual

Overload to avoid it. Light::setType uses the RenderQueue ID to classify lights per type.

Reimplemented from Ogre::MovableObject.

◆ setShadowFarClipDistance()

void Ogre::Light::setShadowFarClipDistance ( Real farClip )

inline

Set the far clip plane distance to be used by the shadow camera, if this light casts texture shadows.

Remarks: This is different from the 'shadow far distance', which is always measured from the main camera. This distance is the far clip plane of the light camera.

Parameters

farClip The distance, or -1 to use the main camera setting.

◆ setShadowFarDistance()

void Ogre::Light::setShadowFarDistance ( Real distance )

Sets the maximum distance away from the camera that shadows by this light will be visible.

Remarks: Shadow techniques can be expensive, therefore it is a good idea to limit them to being rendered close to the camera if possible, and to skip the expense of rendering shadows for distance objects. This method allows you to set the distance at which shadows will no longer be rendered.

Note: Each shadow technique can interpret this subtely differently. For example, one technique may use this to eliminate casters, another might use it to attenuate the shadows themselves. You should tweak this value to suit your chosen shadow technique and scene setup.

◆ setShadowNearClipDistance()

void Ogre::Light::setShadowNearClipDistance ( Real nearClip )

inline

Set the near clip plane distance to be used by the shadow camera, if this light casts texture shadows.

Parameters

nearClip The distance, or -1 to use the main camera setting.

◆ setSpecularColour() [1/2]

void Ogre::Light::setSpecularColour ( const ColourValue & colour )

inline

Sets the colour of the specular light given off by this source.

Remarks: Material objects have ambient, diffuse and specular values which indicate how much of each type of light an object reflects. This value denotes the amount and colour of this type of light the light exudes into the scene. The actual appearance of objects is a combination of the two.

: Specular light affects the appearance of shiny highlights on objects, and is also dependent on the 'shininess' Material value.

◆ setSpecularColour() [2/2]

void Ogre::Light::setSpecularColour	(	Real	red,
		Real	green,
		Real	blue
	)

inline

Sets the colour of the specular light given off by this source.

Remarks: Material objects have ambient, diffuse and specular values which indicate how much of each type of light an object reflects. This value denotes the amount and colour of this type of light the light exudes into the scene. The actual appearance of objects is a combination of the two.

: Specular light affects the appearance of shiny highlights on objects, and is also dependent on the 'shininess' Material value.

◆ setSpotlightFalloff()

void Ogre::Light::setSpotlightFalloff ( Real val )

inline

Sets the falloff between the inner and outer cones of the spotlight.

◆ setSpotlightInnerAngle()

void Ogre::Light::setSpotlightInnerAngle ( const Radian & val )

Sets the angle covered by the spotlights inner cone.

◆ setSpotlightNearClipDistance()

void Ogre::Light::setSpotlightNearClipDistance ( Real nearClip )

inline

Set the near clip plane distance to be used by spotlights that use light clipping, allowing you to render spots as if they start from further down their frustum.

Parameters

nearClip The near distance.

◆ setSpotlightOuterAngle()

void Ogre::Light::setSpotlightOuterAngle ( const Radian & val )

Sets the angle covered by the spotlights outer cone.

◆ setSpotlightRange()

void Ogre::Light::setSpotlightRange	(	const Radian &	innerAngle,
		const Radian &	outerAngle,
		Real	falloff = `1.0`
	)

Sets the range of a spotlight, i.e.

the angle of the inner and outer cones and the rate of falloff between them.

Parameters

innerAngle Angle covered by the bright inner cone

Note: The inner cone applicable only to Direct3D, it'll always treat as zero in OpenGL.

Parameters

outerAngle	Angle covered by the outer cone
falloff	The rate of falloff between the inner and outer cones. 1.0 means a linear falloff, less means slower falloff, higher means faster falloff.

◆ setTexture()

void Ogre::Light::setTexture ( TextureGpu * texture )

Sets a textured for types of light that support it.

At the time of writing only LT_AREA_APPROX supports it.

Remarks: Note that HlmsPbs only supports one 2D Array texture active at a time. i.e. you must call hlmsPbs->setAreaLightMasks( texture ); and if that texture belongs to a different pool as the one you're inputting here, the wrong texture will be displayed!

Parameters

texture	Texture. Can be monochrome or coloured. For Raw version must be a 2D Array texture. For non-Raw version, must be a 2D texture.
sliceIdx	Slice to the texture.

◆ setTextureRaw()

void Ogre::Light::setTextureRaw	(	TextureGpu *	texture,
		uint32	sliceIdx
	)

◆ setType()

void Ogre::Light::setType ( LightTypes type )

Sets the type of light - see LightTypes for more info.

Member Data Documentation

◆ mTexLightMaskDiffuseMipStart

uint16 Ogre::Light::mTexLightMaskDiffuseMipStart

Control the start of mip level for diffuse component for area lights The value is UNORM, thus the range [0; 65535] maps to [0; 1] where 1.0 means to use the highest mip level, and 0 the lowest mip.

◆ mTextureLightMaskIdx

uint16 Ogre::Light::mTextureLightMaskIdx

◆ tempSquareDist

Real Ogre::Light::tempSquareDist

Temp tag used for sorting.

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

OgreLight.h

Public Types

Public Member Functions

Public Attributes

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ LightTypes

Constructor & Destructor Documentation

◆ Light()

◆ ~Light()

Member Function Documentation

◆ _calcTempSquareDist()

◆ _deriveShadowFarClipDistance()

◆ _deriveShadowNearClipDistance()

◆ _getOwnShadowFarDistance()

◆ _setLightProfileIdx()

◆ _updateCustomGpuParameter()

◆ _updateRenderQueue()

◆ createAnimableValue()

◆ getAffectParentNode()

◆ getAs4DVector()

◆ getAttenuationConstant()

◆ getAttenuationLinear()

◆ getAttenuationQuadric()

◆ getAttenuationRange()

◆ getCustomParameter()

◆ getCustomParameterNoThrow()

◆ getDerivedDirection()

◆ getDerivedDirectionUpdated()

◆ getDerivedRectSize()

◆ getDiffuseColour()

◆ getDirection()

◆ getDoubleSided()

◆ getLightProfileIdx()

◆ getMovableType()

◆ getPowerScale()

◆ getRectSize()

◆ getShadowFarClipDistance()

◆ getShadowFarDistance()

◆ getShadowFarDistanceSquared()

◆ getShadowNearClipDistance()

◆ getSpecularColour()

◆ getSpotlightFalloff()

◆ getSpotlightInnerAngle()

◆ getSpotlightNearClipDistance()

◆ getSpotlightOuterAngle()

◆ getSpotlightTanHalfAngle()

◆ getTexture()

◆ getType()

◆ isInLightRange() [1/2]

◆ isInLightRange() [2/2]

◆ notifyTextureChanged()

◆ resetShadowFarDistance()

◆ setAffectParentNode()

◆ setAttenuation()

◆ setAttenuationBasedOnRadius()

1

◆ setCustomParameter()

◆ setDiffuseColour() [1/2]

◆ setDiffuseColour() [2/2]

◆ setDirection()

◆ setDoubleSided()

◆ setPowerScale()

◆ setRectSize()

◆ setRenderQueueGroup()

◆ setShadowFarClipDistance()

◆ setShadowFarDistance()

◆ setShadowNearClipDistance()

◆ setSpecularColour() [1/2]

◆ setSpecularColour() [2/2]

◆ setSpotlightFalloff()

◆ setSpotlightInnerAngle()

◆ setSpotlightNearClipDistance()

◆ setSpotlightOuterAngle()

◆ setSpotlightRange()

◆ setTexture()

◆ setTextureRaw()

◆ setType()

Member Data Documentation

◆ mTexLightMaskDiffuseMipStart