A frustum represents a pyramid, capped at the near and far end which is used to represent either a visible area or a projection area. More...

#include <OgreFrustum.h>

Inheritance diagram for Ogre::Frustum:

Public Member Functions
	Frustum (IdType id, ObjectMemoryManager *objectMemoryManager)
	Named constructor. More...

	~Frustum () override

const Plane *	_getCachedFrustumPlanes () const
	Returns the frustum planes, doesn't check if dirty. More...

const Vector3 *	_getCachedWorldSpaceCorners () const

virtual void	calcViewMatrixRelative (const Vector3 &relPos, Matrix4 &matToUpdate) const
	Calculate a view matrix for this frustum, relative to a potentially dynamic point. More...

virtual void	disableCustomNearClipPlane ()
	Disables any custom near clip plane. More...

virtual void	disableReflection ()
	Disables reflection modification previously turned on with enableReflection. More...

virtual void	enableCustomNearClipPlane (const MovablePlane *plane)
	Links the frustum to a custom near clip plane, which can be used to clip geometry in a custom manner without using user clip planes. More...

virtual void	enableCustomNearClipPlane (const Plane &plane)
	Links the frustum to a custom near clip plane, which can be used to clip geometry in a custom manner without using user clip planes. More...

virtual void	enableReflection (const MovablePlane *p)
	Modifies this frustum so it always renders from the reflection of itself through the plane specified. More...

virtual void	enableReflection (const Plane &p)
	Modifies this frustum so it always renders from the reflection of itself through the plane specified. More...

virtual Real	getAspectRatio () const
	Retrieves the current aspect ratio. More...

const AxisAlignedBox &	getBoundingBox () const
	Overridden from MovableObject. More...

void	getCustomWorldSpaceCorners (ArrayVector3 outCorners[(8+ARRAY_PACKED_REALS - 1)/ARRAY_PACKED_REALS], Real customFarPlane) const

virtual Real	getFarClipDistance () const
	Retrieves the distance from the frustum to the far clipping plane. More...

virtual Real	getFocalLength () const
	Returns focal length of frustum. More...

virtual const Radian &	getFOVy () const
	Retrieves the frustums Y-dimension Field Of View (FOV). More...

virtual void	getFrustumExtents (Real &outleft, Real &outright, Real &outtop, Real &outbottom, FrustrumExtentsType frustrumExtentsType=FET_PROJ_PLANE_POS) const
	Get the extents of the frustum in view space. More...

bool	getFrustumExtentsManuallySet () const

virtual const Vector2 &	getFrustumOffset () const
	Retrieves the frustum offsets. More...

virtual const Plane &	getFrustumPlane (unsigned short plane) const
	Retrieves a specified plane of the frustum (world space). More...

const Plane *	getFrustumPlanes () const
	Retrieves the clipping planes of the frustum (world space). More...

const LightList &	getLights () const override
	Overridden from Renderable. More...

const String &	getMovableType () const override
	Overridden from MovableObject. More...

virtual Real	getNearClipDistance () const
	Sets the position of the near clipping plane. More...

virtual const Quaternion &	getOrientationForViewUpdate () const
	Get the derived orientation of this frustum. More...

OrientationMode	getOrientationMode () const
	Get the orientation mode of the frustum. More...

Radian	getOrientationModeAngle () const
	Get the orientation mode angle of the frustum. More...

virtual Real	getOrthoWindowHeight () const
	Gets the orthographic window height, for use with orthographic rendering only. More...

virtual Real	getOrthoWindowWidth () const
	Gets the orthographic window width, for use with orthographic rendering only. More...

PlaneBoundedVolume	getPlaneBoundedVolume ()
	Gets a world-space list of planes enclosing the frustum. More...

virtual const Vector3 &	getPositionForViewUpdate () const
	Get the derived position of this frustum. More...

virtual const Matrix4 &	getProjectionMatrix () const
	Gets the normal projection matrix for this frustum, ie the projection matrix which conforms to standard right-handed rules and uses depth range [-1,+1]. More...

virtual const Matrix4 &	getProjectionMatrixWithRSDepth () const
	Gets the depth-adjusted projection matrix for the current rendersystem, but one which still conforms to right-hand rules. More...

Vector2	getProjectionParamsAB () const
	Returns the terms projectionA and projectionB in .x and .y respectively, which can be used to reconstruct linear depth from a Z buffer. More...

virtual ProjectionType	getProjectionType () const
	Retrieves info on the type of projection used (orthographic or perspective). More...

virtual const Matrix4 &	getReflectionMatrix () const
	Returns the reflection matrix of the frustum if appropriate. More...

virtual const Plane &	getReflectionPlane () const
	Returns the reflection plane of the frustum if appropriate. More...

void	getRenderOperation (v1::RenderOperation &op, bool casterPass) override
	Overridden from Renderable. More...

Real	getSquaredViewDepth (const Camera *cam) const
	Overridden from Renderable. More...

virtual const Matrix4 &	getViewMatrix () const
	Gets the view matrix for this frustum. More...

virtual const Vector3 *	getWorldSpaceCorners () const
	Gets the world space corners of the frustum. More...

void	getWorldTransforms (Matrix4 *xform) const override
	Overridden from Renderable. More...

virtual bool	isCustomNearClipPlaneEnabled () const
	Is a custom near clip plane in use? More...

virtual bool	isCustomProjectionMatrixEnabled () const
	Returns whether a custom projection matrix is in use. More...

virtual bool	isCustomViewMatrixEnabled () const
	Returns whether a custom view matrix is in use. More...

virtual bool	isReflected () const
	Returns whether this frustum is being reflected. More...

virtual bool	isVisible (const AxisAlignedBox &bound, FrustumPlane *culledBy=0) const
	Tests whether the given container is visible in the Frustum. More...

virtual bool	isVisible (const Sphere &bound, FrustumPlane *culledBy=0) const
	Tests whether the given container is visible in the Frustum. More...

virtual bool	isVisible (const Vector3 &vert, FrustumPlane *culledBy=0) const
	Tests whether the given vertex is visible in the Frustum. More...

virtual bool	projectSphere (const Sphere &sphere, Real left, Real top, Real right, Real bottom) const
	Project a sphere onto the near plane and get the bounding rectangle. More...

virtual void	resetFrustumExtents ()
	Reset the frustum extents to be automatically derived from other params. More...

virtual void	setAspectRatio (Real ratio)
	Sets the aspect ratio for the frustum viewport. More...

virtual void	setCustomProjectionMatrix (bool enable, const Matrix4 &projectionMatrix=Matrix4::IDENTITY, bool alternateDepthRange=false)
	Set whether to use a custom projection matrix on this frustum. More...

virtual void	setCustomViewMatrix (bool enable, const Matrix4 &viewMatrix=Matrix4::IDENTITY)
	Set whether to use a custom view matrix on this frustum. More...

virtual void	setFarClipDistance (Real farDist)
	Sets the distance to the far clipping plane. More...

virtual void	setFocalLength (Real focalLength=1.0)
	Sets frustum focal length (used in stereo rendering). More...

virtual void	setFOVy (const Radian &fovy)
	Sets the Y-dimension Field Of View (FOV) of the frustum. More...

virtual void	setFrustumExtents (Real left, Real right, Real top, Real bottom, FrustrumExtentsType frustrumExtentsType=FET_PROJ_PLANE_POS)
	Manually set the extents of the frustum. More...

virtual void	setFrustumOffset (const Vector2 &offset)
	Sets frustum offsets, used in stereo rendering. More...

virtual void	setFrustumOffset (Real horizontal=0.0, Real vertical=0.0)
	Sets frustum offsets, used in stereo rendering. More...

virtual void	setNearClipDistance (Real nearDist)
	Sets the position of the near clipping plane. More...

void	setOrientationMode (OrientationMode orientationMode)
	Set the orientation mode of the frustum. More...

virtual void	setOrthoWindow (Real w, Real h)
	Sets the orthographic window settings, for use with orthographic rendering only. More...

virtual void	setOrthoWindowHeight (Real h)
	Sets the orthographic window height, for use with orthographic rendering only. More...

virtual void	setOrthoWindowWidth (Real w)
	Sets the orthographic window width, for use with orthographic rendering only. More...

virtual void	setProjectionType (ProjectionType pt)
	Sets the type of projection to use (orthographic or perspective). More...

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

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

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

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

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

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

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

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

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

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. More...

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

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

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

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

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

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

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

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

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

unsigned char	getCurrentMeshLod () const

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

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

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

float	getLocalRadius () const
	See getLocalAabb and getWorldRadius. More...

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

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

SceneNode *	getParentSceneNode () const

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

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

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

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

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

SkeletonInstance *	getSkeletonInstance () const

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

void	resetMeshLod ()
	Sets mCurrentMeshLod to 0. More...

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

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

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

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

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

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

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

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

virtual void	setRenderQueueGroup (uint8 queueID)
	Sets the render queue group this entity will be rendered through. More...

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

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

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

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

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

virtual	~AnimableObject ()

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

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

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

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

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

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

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

virtual	~Renderable ()
	Virtual destructor needed as class has virtual methods. More...

virtual void	_setHlmsHashes (uint32 hash, uint32 casterHash)
	Manually sets the hlms hashes. Don't call this directly. More...

virtual void	_setNullDatablock ()
	Sets the datablock to a null pointer. More...

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

void	addPoseWeight (size_t index, float w)

virtual bool	getCastsShadows () const
	Method which reports whether this renderable would normally cast a shadow. More...

uint8	getCurrentMaterialLod () const

const Vector4 &	getCustomParameter (size_t index) const
	Gets the custom value associated with this Renderable at the given index. More...

const CustomParameterMap &	getCustomParameters () const

HlmsDatablock *	getDatablock () const

const String &	getDatablockOrMaterialName () const

uint32	getHlmsCasterHash () const

uint32	getHlmsHash () const

MaterialPtr	getMaterial () const
	Retrieves the material this renderable object uses. More...

unsigned short	getNumPoses () const

virtual unsigned short	getNumWorldTransforms () const
	Returns the number of world transform matrices this renderable requires. More...

virtual ParticleType::ParticleType	getParticleType () const
	Used by ParticleSystemDef to indicate Hlms they want specific shader code. More...

virtual bool	getPolygonModeOverrideable () const
	Gets whether this renderable's chosen detail level can be overridden (downgraded) by the camera setting. More...

bool	getPoseHalfPrecision () const

bool	getPoseNormals () const

TexBufferPacked *	getPoseTexBuffer () const

float	getPoseWeight (size_t index) const

float *	getPoseWeights () const

uint8	getRenderQueueSubGroup () const

bool	getUseIdentityProjection () const
	Returns whether or not to use an 'identity' projection. More...

bool	getUseIdentityView () const
	Returns whether or not to use an 'identity' view. More...

virtual bool	getUseIdentityViewProjMatrixIsDynamic () const
	Returns whether the Hlms implementation should evaluate getUseIdentityProjection per object at runtime, or if it can assume the Renderable will remain with the same setting until the datablock is flushed (performance optimization) More...

virtual bool	getUseIdentityWorldMatrix () const
	Returns whether the world matrix is an identity matrix. More...

virtual OGRE_DEPRECATED const Any &	getUserAny () const

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

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

const VertexArrayObjectArray &	getVaos (VertexPass vertexPass) const

bool	hasCustomParameter (size_t index) const
	Checks whether a custom value is associated with this Renderable at the given index. More...

bool	hasSkeletonAnimation () const

virtual void	postRender (SceneManager sm, RenderSystem rsys)
	Called immediately after the Renderable has been rendered. More...

virtual bool	preRender (SceneManager sm, RenderSystem rsys)
	Called just prior to the Renderable being rendered. More...

void	removeCustomParameter (size_t index)
	Removes a custom value which is associated with this Renderable at the given index. More...

void	resetMaterialLod ()
	Sets mCurrentMaterialLod to 0. More...

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

virtual void	setDatablock (HlmsDatablock *datablock)
	Assigns a datablock (i.e. HLMS Material) to this renderable. More...

void	setDatablock (IdString datablockName)
	Assigns a datablock (i.e. More...

void	setDatablockOrMaterialName (String materialName, String groupName)
	First tries to see if an HLMS datablock exist with the given name, if not, tries to search among low level materials. More...

virtual void	setMaterial (const MaterialPtr &material)
	Sets the given material. Overrides HLMS materials. More...

void	setMaterialName (const String &name, const String &groupName)
	Sets the name of the Material to be used. Prefer using HLMS. More...

virtual void	setPolygonModeOverrideable (bool override)
	Sets whether this renderable's chosen detail level can be overridden (downgraded) by the camera setting. More...

void	setPoseWeight (size_t index, float w)

void	setRenderQueueSubGroup (uint8 subGroup)
	Sets the render queue sub group. More...

void	setUseIdentityProjection (bool useIdentityProjection)
	Sets whether or not to use an 'identity' projection. More...

void	setUseIdentityView (bool useIdentityView)
	Sets whether or not to use an 'identity' view. More...

virtual OGRE_DEPRECATED void	setUserAny (const Any &anything)

Static Public Attributes
static const Real	INFINITE_FAR_PLANE_ADJUST
	Small constant used to reduce far plane projection to avoid inaccuracies. More...

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

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

Public Types inherited from Ogre::Renderable
typedef map< size_t, Vector4 >::type	CustomParameterMap

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, MovableObjectArray &outCulledObjects, const CullFrustumPreparedData &pd)

static void	cullFrustumPrepare (const Camera frustum, uint32 sceneVisibilityFlags, const Camera lodCamera, CullFrustumPreparedData &pd)

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. More...

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

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

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

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

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

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

static void	updateAllBounds (const size_t numNodes, ObjectData t)

Static Public Member Functions inherited from Ogre::Renderable
static uint8	getDefaultRenderQueueSubGroup ()

static void	setDefaultRenderQueueSubGroup (uint8 subGroup)
	Sets the default render queue sub group for all future Renderable instances. More...

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). More...

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). More...

RenderableArray	mRenderables

Public Attributes inherited from Ogre::Renderable
uint8	mCustomParameter

uint32	mHlmsGlobalIndex
	Index in the vector holding this Rendrable reference in the HLMS datablock. More...

bool	mRenderableVisible
	Control visibility at Renderable (e.g. More...

Detailed Description

A frustum represents a pyramid, capped at the near and far end which is used to represent either a visible area or a projection area.

Can be used for a number of applications.

Constructor & Destructor Documentation

◆ Frustum()

Ogre::Frustum::Frustum	(	IdType	id,
		ObjectMemoryManager *	objectMemoryManager
	)

Named constructor.

◆ ~Frustum()

Ogre::Frustum::~Frustum ( )

override

Member Function Documentation

◆ _getCachedFrustumPlanes()

const Plane* Ogre::Frustum::_getCachedFrustumPlanes ( ) const

inline

Returns the frustum planes, doesn't check if dirty.

◆ _getCachedWorldSpaceCorners()

const Vector3* Ogre::Frustum::_getCachedWorldSpaceCorners ( ) const

inline

◆ calcViewMatrixRelative()

virtual void Ogre::Frustum::calcViewMatrixRelative	(	const Vector3 &	relPos,
		Matrix4 &	matToUpdate
	)		const

virtual

Calculate a view matrix for this frustum, relative to a potentially dynamic point.

Mainly for use by OGRE internally when using camera-relative rendering for frustums that are not the centre (e.g. texture projection)

◆ disableCustomNearClipPlane()

virtual void Ogre::Frustum::disableCustomNearClipPlane ( )

virtual

Disables any custom near clip plane.

◆ disableReflection()

virtual void Ogre::Frustum::disableReflection ( )

virtual

Disables reflection modification previously turned on with enableReflection.

◆ enableCustomNearClipPlane() [1/2]

virtual void Ogre::Frustum::enableCustomNearClipPlane ( const MovablePlane * plane )

virtual

Links the frustum to a custom near clip plane, which can be used to clip geometry in a custom manner without using user clip planes.

Remarks: There are several applications for clipping a scene arbitrarily by a single plane; the most common is when rendering a reflection to a texture, and you only want to render geometry that is above the water plane (to do otherwise results in artefacts). Whilst it is possible to use user clip planes, they are not supported on all cards, and sometimes are not hardware accelerated when they are available. Instead, where a single clip plane is involved, this technique uses a 'fudging' of the near clip plane, which is available and fast on all hardware, to perform as the arbitrary clip plane. This does change the shape of the frustum, leading to some depth buffer loss of precision, but for many of the uses of this technique that is not an issue.

: This version of the method links to a plane, rather than requiring a by-value plane definition, and therefore you can make changes to the plane (e.g. by moving / rotating the node it is attached to) and they will automatically affect this object.

Note: This technique only works for perspective projection.

Parameters

plane The plane to link to to perform the clipping. This plane must continue to exist while the camera is linked to it; do not destroy it before the frustum.

◆ enableCustomNearClipPlane() [2/2]

virtual void Ogre::Frustum::enableCustomNearClipPlane ( const Plane & plane )

virtual

Links the frustum to a custom near clip plane, which can be used to clip geometry in a custom manner without using user clip planes.

Remarks: There are several applications for clipping a scene arbitrarily by a single plane; the most common is when rendering a reflection to a texture, and you only want to render geometry that is above the water plane (to do otherwise results in artefacts). Whilst it is possible to use user clip planes, they are not supported on all cards, and sometimes are not hardware accelerated when they are available. Instead, where a single clip plane is involved, this technique uses a 'fudging' of the near clip plane, which is available and fast on all hardware, to perform as the arbitrary clip plane. This does change the shape of the frustum, leading to some depth buffer loss of precision, but for many of the uses of this technique that is not an issue.

Note: This technique only works for perspective projection.

Parameters

plane The plane to link to to perform the clipping. This plane must continue to exist while the camera is linked to it; do not destroy it before the frustum.

◆ enableReflection() [1/2]

virtual void Ogre::Frustum::enableReflection ( const MovablePlane * p )

virtual

Modifies this frustum so it always renders from the reflection of itself through the plane specified.

Note that this version of the method links to a plane so that changes to it are picked up automatically. It is important that this plane continues to exist whilst this object does; do not destroy the plane before the frustum.

Remarks: This is obviously useful for performing planar reflections.

◆ enableReflection() [2/2]

virtual void Ogre::Frustum::enableReflection ( const Plane & p )

virtual

Modifies this frustum so it always renders from the reflection of itself through the plane specified.

Remarks: This is obviously useful for performing planar reflections.

◆ getAspectRatio()

virtual Real Ogre::Frustum::getAspectRatio ( ) const

virtual

Retrieves the current aspect ratio.

◆ getBoundingBox()

const AxisAlignedBox& Ogre::Frustum::getBoundingBox ( ) const

Overridden from MovableObject.

◆ getCustomWorldSpaceCorners()

void Ogre::Frustum::getCustomWorldSpaceCorners	(	ArrayVector3	outCorners[(8+ARRAY_PACKED_REALS - 1)/ARRAY_PACKED_REALS],
		Real	customFarPlane
	)		const

◆ getFarClipDistance()

virtual Real Ogre::Frustum::getFarClipDistance ( ) const

virtual

Retrieves the distance from the frustum to the far clipping plane.

Reimplemented in Ogre::Camera.

◆ getFocalLength()

virtual Real Ogre::Frustum::getFocalLength ( ) const

virtual

Returns focal length of frustum.

◆ getFOVy()

virtual const Radian& Ogre::Frustum::getFOVy ( ) const

virtual

Retrieves the frustums Y-dimension Field Of View (FOV).

◆ getFrustumExtents()

virtual void Ogre::Frustum::getFrustumExtents	(	Real &	outleft,
		Real &	outright,
		Real &	outtop,
		Real &	outbottom,
		FrustrumExtentsType	frustrumExtentsType = `FET_PROJ_PLANE_POS`
	)		const

virtual

Get the extents of the frustum in view space.

Parameters

outleft,outright,outtop,outbottom	The position where the side clip planes intersect the near clip plane, in eye space OR the tangent of the half angles from the eye to the edges of the near clip plane
frustrumExtentsType	Specifies in what format the extents are returned. See OgreFrustrum::setFrustumExtents for more information

◆ getFrustumExtentsManuallySet()

bool Ogre::Frustum::getFrustumExtentsManuallySet ( ) const

◆ getFrustumOffset()

virtual const Vector2& Ogre::Frustum::getFrustumOffset ( ) const

virtual

Retrieves the frustum offsets.

◆ getFrustumPlane()

virtual const Plane& Ogre::Frustum::getFrustumPlane ( unsigned short plane ) const

virtual

Retrieves a specified plane of the frustum (world space).

Remarks: Gets a reference to one of the planes which make up the frustum frustum, e.g. for clipping purposes.

Reimplemented in Ogre::Camera.

◆ getFrustumPlanes()

const Plane* Ogre::Frustum::getFrustumPlanes ( ) const

Retrieves the clipping planes of the frustum (world space).

Remarks: The clipping planes are ordered as declared in enumerate constants FrustumPlane.

◆ getLights()

const LightList& Ogre::Frustum::getLights ( ) const

overridevirtual

Overridden from Renderable.

Implements Ogre::Renderable.

◆ getMovableType()

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

overridevirtual

Overridden from MovableObject.

Implements Ogre::MovableObject.

◆ getNearClipDistance()

virtual Real Ogre::Frustum::getNearClipDistance ( ) const

virtual

Sets the position of the near clipping plane.

Reimplemented in Ogre::Camera.

◆ getOrientationForViewUpdate()

virtual const Quaternion& Ogre::Frustum::getOrientationForViewUpdate ( ) const

virtual

Get the derived orientation of this frustum.

Reimplemented in Ogre::Camera.

◆ getOrientationMode()

OrientationMode Ogre::Frustum::getOrientationMode ( ) const

Get the orientation mode of the frustum.

Remarks: Getting the orientation of a frustum is only supported on iOS at this time. An exception is thrown on other platforms.

◆ getOrientationModeAngle()

Radian Ogre::Frustum::getOrientationModeAngle ( ) const

Get the orientation mode angle of the frustum.

Remarks: Getting the orientation of a frustum is only supported on iOS at this time. An exception is thrown on other platforms.

◆ getOrthoWindowHeight()

virtual Real Ogre::Frustum::getOrthoWindowHeight ( ) const

virtual

Gets the orthographic window height, for use with orthographic rendering only.

◆ getOrthoWindowWidth()

virtual Real Ogre::Frustum::getOrthoWindowWidth ( ) const

virtual

Gets the orthographic window width, for use with orthographic rendering only.

Note: This is calculated from the orthographic height and the aspect ratio

◆ getPlaneBoundedVolume()

PlaneBoundedVolume Ogre::Frustum::getPlaneBoundedVolume ( )

Gets a world-space list of planes enclosing the frustum.

◆ getPositionForViewUpdate()

virtual const Vector3& Ogre::Frustum::getPositionForViewUpdate ( ) const

virtual

Get the derived position of this frustum.

Reimplemented in Ogre::Camera.

◆ getProjectionMatrix()

virtual const Matrix4& Ogre::Frustum::getProjectionMatrix ( ) const

virtual

Gets the normal projection matrix for this frustum, ie the projection matrix which conforms to standard right-handed rules and uses depth range [-1,+1].

Remarks: This differs from the rendering-API dependent getProjectionMatrixRS in that it always returns a right-handed projection matrix with depth range [-1,+1], result no matter what rendering API is being used - this is required for some uniform algebra for example.

◆ getProjectionMatrixWithRSDepth()

virtual const Matrix4& Ogre::Frustum::getProjectionMatrixWithRSDepth ( ) const

virtual

Gets the depth-adjusted projection matrix for the current rendersystem, but one which still conforms to right-hand rules.

Remarks: This differs from the rendering-API dependent getProjectionMatrix in that it always returns a right-handed projection matrix result no matter what rendering API is being used - this is required for vertex and fragment programs for example. However, the resulting depth range may still vary between render systems since D3D uses [0,1] and GL uses [-1,1].

◆ getProjectionParamsAB()

Vector2 Ogre::Frustum::getProjectionParamsAB ( ) const

Returns the terms projectionA and projectionB in .x and .y respectively, which can be used to reconstruct linear depth from a Z buffer.

If the projection type is PT_PERSPECTIVE, use the following formula:

linearDepth = projectionParams.y / (fDepth - projectionParams.x);

But if the projection type is PT_ORTHOGRAPHIC, use the formula:

linearDepth = (fDepth - projectionParams.x) / projectionParams.y;

◆ getProjectionType()

virtual ProjectionType Ogre::Frustum::getProjectionType ( ) const

virtual

Retrieves info on the type of projection used (orthographic or perspective).

◆ getReflectionMatrix()

virtual const Matrix4& Ogre::Frustum::getReflectionMatrix ( ) const

inlinevirtual

Returns the reflection matrix of the frustum if appropriate.

◆ getReflectionPlane()

virtual const Plane& Ogre::Frustum::getReflectionPlane ( ) const

inlinevirtual

Returns the reflection plane of the frustum if appropriate.

◆ getRenderOperation()

void Ogre::Frustum::getRenderOperation	(	v1::RenderOperation &	op,
		bool	casterPass
	)

overridevirtual

Overridden from Renderable.

Implements Ogre::Renderable.

◆ getSquaredViewDepth()

Real Ogre::Frustum::getSquaredViewDepth ( const Camera * cam ) const

Overridden from Renderable.

◆ getViewMatrix()

virtual const Matrix4& Ogre::Frustum::getViewMatrix ( ) const

virtual

Gets the view matrix for this frustum.

Mainly for use by OGRE internally.

Reimplemented in Ogre::Camera.

◆ getWorldSpaceCorners()

virtual const Vector3* Ogre::Frustum::getWorldSpaceCorners ( ) const

virtual

Gets the world space corners of the frustum.

Remarks: The corners are ordered as follows: top-right near, top-left near, bottom-left near, bottom-right near, top-right far, top-left far, bottom-left far, bottom-right far.

Reimplemented in Ogre::Camera.

◆ getWorldTransforms()

void Ogre::Frustum::getWorldTransforms ( Matrix4 * xform ) const

overridevirtual

Overridden from Renderable.

Implements Ogre::Renderable.

◆ isCustomNearClipPlaneEnabled()

virtual bool Ogre::Frustum::isCustomNearClipPlaneEnabled ( ) const

inlinevirtual

Is a custom near clip plane in use?

◆ isCustomProjectionMatrixEnabled()

virtual bool Ogre::Frustum::isCustomProjectionMatrixEnabled ( ) const

inlinevirtual

Returns whether a custom projection matrix is in use.

◆ isCustomViewMatrixEnabled()

virtual bool Ogre::Frustum::isCustomViewMatrixEnabled ( ) const

inlinevirtual

Returns whether a custom view matrix is in use.

◆ isReflected()

virtual bool Ogre::Frustum::isReflected ( ) const

inlinevirtual

Returns whether this frustum is being reflected.

◆ isVisible() [1/3]

virtual bool Ogre::Frustum::isVisible	(	const AxisAlignedBox &	bound,
		FrustumPlane *	culledBy = `0`
	)		const

virtual

Tests whether the given container is visible in the Frustum.

Parameters

bound	Bounding box to be checked (world space).
culledBy	Optional pointer to an int which will be filled by the plane number which culled the box if the result was `false`;

Returns: If the box was visible, true is returned.

: Otherwise, false is returned.

Reimplemented in Ogre::Camera.

◆ isVisible() [2/3]

virtual bool Ogre::Frustum::isVisible	(	const Sphere &	bound,
		FrustumPlane *	culledBy = `0`
	)		const

virtual

Tests whether the given container is visible in the Frustum.

Parameters

bound	Bounding sphere to be checked (world space).
culledBy	Optional pointer to an int which will be filled by the plane number which culled the box if the result was `false`;

Returns: If the sphere was visible, true is returned.

: Otherwise, false is returned.

Reimplemented in Ogre::Camera.

◆ isVisible() [3/3]

virtual bool Ogre::Frustum::isVisible	(	const Vector3 &	vert,
		FrustumPlane *	culledBy = `0`
	)		const

virtual

Tests whether the given vertex is visible in the Frustum.

Parameters

vert	Vertex to be checked (world space).
culledBy	Optional pointer to an int which will be filled by the plane number which culled the box if the result was `false`;

Returns: If the sphere was visible, true is returned.

: Otherwise, false is returned.

Reimplemented in Ogre::Camera.

◆ projectSphere()

virtual bool Ogre::Frustum::projectSphere	(	const Sphere &	sphere,
		Real *	left,
		Real *	top,
		Real *	right,
		Real *	bottom
	)		const

virtual

Project a sphere onto the near plane and get the bounding rectangle.

Parameters

sphere	The world-space sphere to project.
left	Pointers to destination values, these will be completed with the normalised device coordinates (in the range {-1,1}).
top	Pointers to destination values, these will be completed with the normalised device coordinates (in the range {-1,1}).
right	Pointers to destination values, these will be completed with the normalised device coordinates (in the range {-1,1}).
bottom	Pointers to destination values, these will be completed with the normalised device coordinates (in the range {-1,1}).

Returns: true if the sphere was projected to a subset of the near plane, false if the entire near plane was contained.

Reimplemented in Ogre::Camera.

◆ resetFrustumExtents()

virtual void Ogre::Frustum::resetFrustumExtents ( )

virtual

Reset the frustum extents to be automatically derived from other params.

◆ setAspectRatio()

virtual void Ogre::Frustum::setAspectRatio ( Real ratio )

virtual

Sets the aspect ratio for the frustum viewport.

Remarks: The ratio between the x and y dimensions of the rectangular area visible through the frustum is known as aspect ratio: aspect = width / height .

: The default for most fullscreen windows is 1.3333 - this is also assumed by Ogre unless you use this method to state otherwise.

◆ setCustomProjectionMatrix()

virtual void Ogre::Frustum::setCustomProjectionMatrix	(	bool	enable,
		const Matrix4 &	projectionMatrix = `Matrix4::IDENTITY`,
		bool	alternateDepthRange = `false`
	)

virtual

Set whether to use a custom projection matrix on this frustum.

Remarks: This is an advanced method which allows you to manually set the projection matrix on this frustum, rather than having it calculate itself based on the clipping distances or the field of view.

See Frustum::setCustomViewMatrix

Note: After enabling a custom projection matrix, the frustum will no longer update on its own based on field of view and near / far distance changes. You are completely responsible for keeping the projection matrix up to date if those values change. The custom matrix will be returned from getProjectionMatrix and derivative functions. Even when using a custom projection matrix, you should still call the methods that update the ner / far distances and field of view.

Parameters

enable	If `true`, the custom projection matrix passed as the second parameter will be used in preference to an auto calculated one. If `false`, the frustum will revert to auto calculating the projection matrix.
projectionMatrix	The custom view matrix to use.
alternateDepthRange	Set this to true if the input projectionMatrix has the depth in range [0; 1] instead of the range [-1; 1] that Ogre expects.

Projection matrices obtained from Oculus SDK's need to set this to true.

Note that we will internally convert the projection matrix by performing the range conversion, so don't expect Frustum::getProjectionMatrix to return you exactly the same projection matrix you passed to us!

◆ setCustomViewMatrix()

virtual void Ogre::Frustum::setCustomViewMatrix	(	bool	enable,
		const Matrix4 &	viewMatrix = `Matrix4::IDENTITY`
	)

virtual

Set whether to use a custom view matrix on this frustum.

Remarks: This is an advanced method which allows you to manually set the view matrix on this frustum, rather than having it calculate itself based on it's position and orientation.

Note: After enabling a custom view matrix, the frustum will no longer update on its own based on position / orientation changes. You are completely responsible for keeping the view matrix up to date. The custom matrix will be returned from getViewMatrix.

Parameters

enable	If `true`, the custom view matrix passed as the second parameter will be used in preference to an auto calculated one. If false, the frustum will revert to auto calculating the view matrix.
viewMatrix	The custom view matrix to use, the matrix must be an affine matrix.

See also: Frustum::setCustomProjectionMatrix, Matrix4::isAffine

◆ setFarClipDistance()

virtual void Ogre::Frustum::setFarClipDistance ( Real farDist )

virtual

Sets the distance to the far clipping plane.

Remarks: The view frustum is a pyramid created from the frustum position and the edges of the viewport. This method sets the distance for the far end of that pyramid. Different applications need different values: e.g. a flight sim needs a much further far clipping plane than a first-person shooter. An important point here is that the larger the ratio between near and far clipping planes, the lower the accuracy of the Z-buffer used to depth-cue pixels. This is because the Z-range is limited to the size of the Z buffer (16 or 32-bit) and the max values must be spread over the gap between near and far clip planes. As it happens, you can affect the accuracy far more by altering the near distance rather than the far distance, but keep this in mind.

Parameters

farDist The distance to the far clipping plane from the frustum in world coordinates.If you specify 0, this means an infinite view distance which is useful especially when projecting shadows; but be careful not to use a near distance too close.

◆ setFocalLength()

virtual void Ogre::Frustum::setFocalLength ( Real focalLength = 1.0 )

virtual

Sets frustum focal length (used in stereo rendering).

Parameters

focalLength The distance to the focal plane from the frustum in world coordinates.

◆ setFOVy()

virtual void Ogre::Frustum::setFOVy ( const Radian & fovy )

virtual

Sets the Y-dimension Field Of View (FOV) of the frustum.

Remarks: Field Of View (FOV) is the angle made between the frustum's position, and the edges of the 'screen' onto which the scene is projected. High values (90+ degrees) result in a wide-angle, fish-eye kind of view, low values (30- degrees) in a stretched, telescopic kind of view. Typical values are between 45 and 60 degrees.

: This value represents the VERTICAL field-of-view. The horizontal field of view is calculated from this depending on the dimensions of the viewport (they will only be the same if the viewport is square).

Note: Setting the FOV overrides the value supplied for frustum::setNearClipPlane.

◆ setFrustumExtents()

virtual void Ogre::Frustum::setFrustumExtents	(	Real	left,
		Real	right,
		Real	top,
		Real	bottom,
		FrustrumExtentsType	frustrumExtentsType = `FET_PROJ_PLANE_POS`
	)

virtual

Manually set the extents of the frustum.

Parameters

left,right,top,bottom	The position where the side clip planes intersect the near clip plane, in eye space OR the tangent of the half angles from the eye to the edges of the near clip plane
frustrumExtentsType	Specifies how the extents are represented. Be default they are the positions on near clip plane. However if this is a scene camera it is recommended that you actually use the tangent of the half angles. ie Half the FoV angles. This is because Ogre uses this camera setup to calculate custom clipping planes for PSSM algorithms, and Forward+ algorithms, but alter the near and far clip distances.

: If you supply extents as positions on the projection plane the near clip distance has already been calculated as part of the supplied extents, however if they are tangent of the half angles Ogre can apply different near clip distances dynamically.

◆ setFrustumOffset() [1/2]

virtual void Ogre::Frustum::setFrustumOffset ( const Vector2 & offset )

virtual

Sets frustum offsets, used in stereo rendering.

Remarks: You can set both horizontal and vertical plane offsets of "eye"; in stereo rendering frustum is moved in horizontal plane. To be able to render from two "eyes" you'll need two cameras rendering on two RenderTargets.

: The frustum offsets is in world coordinates, and default to (0, 0) - no offsets.

Parameters

offset The horizontal and vertical plane offsets.

◆ setFrustumOffset() [2/2]

virtual void Ogre::Frustum::setFrustumOffset	(	Real	horizontal = `0.0`,
		Real	vertical = `0.0`
	)

virtual

Sets frustum offsets, used in stereo rendering.

Remarks: You can set both horizontal and vertical plane offsets of "eye"; in stereo rendering frustum is moved in horizontal plane. To be able to render from two "eyes" you'll need two cameras rendering on two RenderTargets.

: The frustum offsets is in world coordinates, and default to (0, 0) - no offsets.

Parameters

horizontal	The horizontal plane offset.
vertical	The vertical plane offset.

◆ setNearClipDistance()

virtual void Ogre::Frustum::setNearClipDistance ( Real nearDist )

virtual

Sets the position of the near clipping plane.

Remarks: The position of the near clipping plane is the distance from the frustums position to the screen on which the world is projected. The near plane distance, combined with the field-of-view and the aspect ratio, determines the size of the viewport through which the world is viewed (in world co-ordinates). Note that this world viewport is different to a screen viewport, which has it's dimensions expressed in pixels. The frustums viewport should have the same aspect ratio as the screen viewport it renders into to avoid distortion.

Parameters

nearDist The distance to the near clipping plane from the frustum in world coordinates.

◆ setOrientationMode()

void Ogre::Frustum::setOrientationMode ( OrientationMode orientationMode )

Set the orientation mode of the frustum.

Default is OR_DEGREE_0

Remarks: Setting the orientation of a frustum is only supported on iOS at this time. An exception is thrown on other platforms.

◆ setOrthoWindow()

virtual void Ogre::Frustum::setOrthoWindow	(	Real	w,
		Real	h
	)

virtual

Sets the orthographic window settings, for use with orthographic rendering only.

Note: Calling this method will recalculate the aspect ratio, use setOrthoWindowHeight or setOrthoWindowWidth alone if you wish to preserve the aspect ratio but just fit one or other dimension to a particular size.

Parameters

w	The width of the view window in world units.
h	The height of the view window in world units.

◆ setOrthoWindowHeight()

virtual void Ogre::Frustum::setOrthoWindowHeight ( Real h )

virtual

Sets the orthographic window height, for use with orthographic rendering only.

Note: The width of the window will be calculated from the aspect ratio.

Parameters

h	The height of the view window in world units.

◆ setOrthoWindowWidth()

virtual void Ogre::Frustum::setOrthoWindowWidth ( Real w )

virtual

Sets the orthographic window width, for use with orthographic rendering only.

Note: The height of the window will be calculated from the aspect ratio.

Parameters

w	The width of the view window in world units.

◆ setProjectionType()

virtual void Ogre::Frustum::setProjectionType ( ProjectionType pt )

virtual

Sets the type of projection to use (orthographic or perspective).

Default is perspective.

Member Data Documentation

◆ INFINITE_FAR_PLANE_ADJUST

const Real Ogre::Frustum::INFINITE_FAR_PLANE_ADJUST

static

Small constant used to reduce far plane projection to avoid inaccuracies.

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

OgreFrustum.h

Public Member Functions

Static Public Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ Frustum()

◆ ~Frustum()

Member Function Documentation

◆ _getCachedFrustumPlanes()

◆ _getCachedWorldSpaceCorners()

◆ calcViewMatrixRelative()

◆ disableCustomNearClipPlane()

◆ disableReflection()

◆ enableCustomNearClipPlane() [1/2]

◆ enableCustomNearClipPlane() [2/2]

◆ enableReflection() [1/2]

◆ enableReflection() [2/2]

◆ getAspectRatio()

◆ getBoundingBox()

◆ getCustomWorldSpaceCorners()

◆ getFarClipDistance()

◆ getFocalLength()

◆ getFOVy()

◆ getFrustumExtents()

◆ getFrustumExtentsManuallySet()

◆ getFrustumOffset()

◆ getFrustumPlane()

◆ getFrustumPlanes()

◆ getLights()

◆ getMovableType()

◆ getNearClipDistance()

◆ getOrientationForViewUpdate()

◆ getOrientationMode()

◆ getOrientationModeAngle()

◆ getOrthoWindowHeight()

◆ getOrthoWindowWidth()

◆ getPlaneBoundedVolume()

◆ getPositionForViewUpdate()

◆ getProjectionMatrix()

◆ getProjectionMatrixWithRSDepth()

◆ getProjectionParamsAB()

◆ getProjectionType()

◆ getReflectionMatrix()

◆ getReflectionPlane()

◆ getRenderOperation()

◆ getSquaredViewDepth()

◆ getViewMatrix()

◆ getWorldSpaceCorners()

◆ getWorldTransforms()

◆ isCustomNearClipPlaneEnabled()

◆ isCustomProjectionMatrixEnabled()

◆ isCustomViewMatrixEnabled()

◆ isReflected()

◆ isVisible() [1/3]

◆ isVisible() [2/3]

◆ isVisible() [3/3]

◆ projectSphere()

◆ resetFrustumExtents()

◆ setAspectRatio()

◆ setCustomProjectionMatrix()

◆ setCustomViewMatrix()

◆ setFarClipDistance()

◆ setFocalLength()

◆ setFOVy()

◆ setFrustumExtents()

◆ setFrustumOffset() [1/2]

◆ setFrustumOffset() [2/2]

◆ setNearClipDistance()

◆ setOrientationMode()

◆ setOrthoWindow()

◆ setOrthoWindowHeight()

◆ setOrthoWindowWidth()

◆ setProjectionType()

Member Data Documentation

◆ INFINITE_FAR_PLANE_ADJUST