OGRE  1.12.9
Object-Oriented Graphics Rendering Engine
Ogre::Frustum Class Reference

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 Types

typedef Vector3 Corners[8]
 
- Public Types inherited from Ogre::ShadowCaster
typedef std::vector< ShadowRenderable * > ShadowRenderableList
 
typedef VectorIterator< ShadowRenderableListShadowRenderableListIterator
 
- Public Types inherited from Ogre::Renderable
enum  { DEFAULT_PRIORITY = 100 }
 
typedef SharedPtr< RenderSystemDataRenderSystemDataPtr
 

Public Member Functions

 Frustum (const String &name=BLANKSTRING)
 Named constructor. More...
 
virtual ~Frustum ()
 
void _notifyCurrentCamera (Camera *cam) override
 Internal method to notify the object of the camera to be used for the next rendering operation. More...
 
void _updateRenderQueue (RenderQueue *queue) override
 Internal method by which the movable object must add Renderable subclass instances to the rendering queue. More...
 
void calcViewMatrixRelative (const Vector3 &relPos, Matrix4 &matToUpdate) const
 Calculate a view matrix for this frustum, relative to a potentially dynamic point. More...
 
void disableCustomNearClipPlane (void)
 Disables any custom near clip plane. More...
 
void disableReflection (void)
 Disables reflection modification previously turned on with enableReflection. More...
 
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...
 
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...
 
void enableReflection (const MovablePlane *p)
 Modifies this frustum so it always renders from the reflection of itself through the plane specified. More...
 
void enableReflection (const Plane &p)
 Modifies this frustum so it always renders from the reflection of itself through the plane specified. More...
 
Real getAspectRatio (void) const
 Retrieves the current aspect ratio. More...
 
const AxisAlignedBoxgetBoundingBox (void) const override
 Retrieves the local axis-aligned bounding box for this object. More...
 
Real getBoundingRadius (void) const override
 Retrieves the radius of the origin-centered bounding sphere for this object. More...
 
const ColourValuegetDebugColour () const
 
Real getFarClipDistance (void) const
 Retrieves the distance from the frustum to the far clipping plane. More...
 
Real getFocalLength () const
 Returns focal length of frustum. More...
 
const RadiangetFOVy (void) const
 Retrieves the frustums Y-dimension Field Of View (FOV). More...
 
RealRect getFrustumExtents () const
 Get the extents of the frustum in view space. More...
 
void getFrustumExtents (Real &outleft, Real &outright, Real &outtop, Real &outbottom) const
 
const Vector2getFrustumOffset () const
 Retrieves the frustum offsets. More...
 
virtual const PlanegetFrustumPlane (unsigned short plane) const
 Retrieves a specified plane of the frustum (world space). More...
 
virtual const PlanegetFrustumPlanes (void) const
 Retrieves the clipping planes of the frustum (world space). More...
 
const LightListgetLights (void) const override
 Gets a list of lights, ordered relative to how close they are to this renderable. More...
 
const MaterialPtrgetMaterial (void) const override
 Retrieves a weak reference to the material this renderable object uses. More...
 
const StringgetMovableType (void) const override
 Returns the type name of this object. More...
 
Real getNearClipDistance (void) const
 Sets the position of the near clipping plane. More...
 
virtual const QuaterniongetOrientationForViewUpdate (void) const
 Get the derived orientation of this frustum. More...
 
OrientationMode getOrientationMode () const
 Get the orientation mode of the frustum. More...
 
Real getOrthoWindowHeight () const
 Gets the orthographic window height, for use with orthographic rendering only. More...
 
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 Vector3getPositionForViewUpdate (void) const
 Get the derived position of this frustum. More...
 
const Matrix4getProjectionMatrix (void) 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...
 
const Matrix4getProjectionMatrixRS (void) const
 Gets the projection matrix for this frustum adjusted for the current rendersystem specifics (may be right or left-handed, depth range may vary). More...
 
const Matrix4getProjectionMatrixWithRSDepth (void) const
 Gets the depth-adjusted projection matrix for the current rendersystem, but one which still conforms to right-hand rules. More...
 
ProjectionType getProjectionType (void) const
 Retrieves info on the type of projection used (orthographic or perspective). More...
 
const Affine3getReflectionMatrix (void) const
 Returns the reflection matrix of the frustum if appropriate. More...
 
const PlanegetReflectionPlane (void) const
 Returns the reflection plane of the frustum if appropriate. More...
 
void getRenderOperation (RenderOperation &op) override
 Gets the render operation required to send this object to the frame buffer. More...
 
Real getSquaredViewDepth (const Camera *cam) const override
 Returns the camera-relative squared depth of this renderable. More...
 
uint32 getTypeFlags (void) const override
 Get the 'type flags' for this MovableObject. More...
 
const Affine3getViewMatrix (void) const
 Gets the view matrix for this frustum. More...
 
virtual const CornersgetWorldSpaceCorners (void) const
 Gets the world space corners of the frustum. More...
 
void getWorldTransforms (Matrix4 *xform) const override
 Gets the world transform matrix / matrices for this renderable object. More...
 
bool isCustomNearClipPlaneEnabled (void) const
 Is a custom near clip plane in use? More...
 
bool isCustomProjectionMatrixEnabled (void) const
 Returns whether a custom projection matrix is in use. More...
 
bool isCustomViewMatrixEnabled (void) const
 Returns whether a custom view matrix is in use. More...
 
bool isReflected (void) 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...
 
void resetFrustumExtents ()
 Reset the frustum extents to be automatically derived from other params. More...
 
void setAspectRatio (Real ratio)
 Sets the aspect ratio for the frustum viewport. More...
 
void setCustomProjectionMatrix (bool enable, const Matrix4 &projectionMatrix=Matrix4::IDENTITY)
 Set whether to use a custom projection matrix on this frustum. More...
 
void setCustomViewMatrix (bool enable, const Affine3 &viewMatrix=Affine3::IDENTITY)
 Set whether to use a custom view matrix on this frustum. More...
 
void setDebugColour (const ColourValue &col)
 
void setFarClipDistance (Real farDist)
 Sets the distance to the far clipping plane. More...
 
void setFocalLength (Real focalLength=1.0)
 Sets frustum focal length (used in stereo rendering). More...
 
void setFOVy (const Radian &fovy)
 Sets the Y-dimension Field Of View (FOV) of the frustum. More...
 
void setFrustumExtents (Real left, Real right, Real top, Real bottom)
 Manually set the extents of the frustum. More...
 
void setFrustumOffset (const Vector2 &offset)
 Sets frustum offsets, used in stereo rendering. More...
 
void setFrustumOffset (Real horizontal=0.0, Real vertical=0.0)
 Sets frustum offsets, used in stereo rendering. More...
 
void setMaterial (const MaterialPtr &mat)
 
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...
 
void setOrthoWindow (Real w, Real h)
 Sets the orthographic window settings, for use with orthographic rendering only. More...
 
void setOrthoWindowHeight (Real h)
 Sets the orthographic window height, for use with orthographic rendering only. More...
 
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...
 
void visitRenderables (Renderable::Visitor *visitor, bool debugRenderables=false)
 Method to allow a caller to abstractly iterate over the Renderable instances that this MovableObject will add to the render queue when asked, if any. More...
 
- Public Member Functions inherited from Ogre::MovableObject
 MovableObject ()
 Constructor. More...
 
 MovableObject (const String &name)
 Named constructor. More...
 
virtual ~MovableObject ()
 Virtual destructor - read Scott Meyers if you don't know why this is needed. More...
 
MovableObjectFactory_getCreator (void) const
 Get the creator of this object, if any (internal use only) More...
 
LightList_getLightList ()
 Returns a pointer to the current list of lights for this object. More...
 
SceneManager_getManager (void) const
 Get the manager of this object, if any (internal use only) More...
 
virtual const Affine3_getParentNodeFullTransform (void) const
 Return the full transformation of the parent sceneNode or the attachingPoint node. More...
 
virtual void _notifyAttached (Node *parent, bool isTagPoint=false)
 Internal method called to notify the object that it has been attached to a node. More...
 
virtual void _notifyCreator (MovableObjectFactory *fact)
 Notify the object of it's creator (internal use only) More...
 
virtual void _notifyManager (SceneManager *man)
 Notify the object of it's manager (internal use only) More...
 
virtual void _notifyMoved (void)
 Internal method called to notify the object that it has been moved. 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...
 
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 (void)
 Detaches an object from a parent SceneNode or TagPoint, if attached. More...
 
bool getCastShadows (void) const
 Returns whether shadow casting is enabled for this object. More...
 
const AxisAlignedBoxgetDarkCapBounds (const Light &light, Real dirLightExtrusionDist) const override
 Gets the world space bounding box of the dark cap, as extruded using the light provided. More...
 
EdgeDatagetEdgeList (void)
 Returns details of the edges which might be used to determine a silhouette. More...
 
const AxisAlignedBoxgetLightCapBounds (void) const override
 Gets the world space bounding box of the light cap. More...
 
uint32 getLightMask () const
 Get a bitwise mask which will filter the lights affecting this object. More...
 
ListenergetListener (void) const
 Gets the current listener for this object. More...
 
const StringgetName (void) const
 Returns the name of this object. More...
 
NodegetParentNode (void) const
 Returns the node to which this object is attached. More...
 
SceneNodegetParentSceneNode (void) const
 Returns the scene node to which this object is attached. More...
 
Real getPointExtrusionDistance (const Light *l) const
 Get the distance to extrude for a point/spot light. More...
 
uint32 getQueryFlags (void) const
 Returns the query flags relevant for this object. More...
 
bool getReceivesShadows ()
 Returns whether the Material of any Renderable that this MovableObject will add to the render queue will receive shadows. More...
 
Real getRenderingDistance (void) 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 (void) const
 Gets the queue group for this entity. More...
 
const ShadowRenderableListgetShadowVolumeRenderableList (ShadowTechnique shadowTechnique, const Light *light, HardwareIndexBufferSharedPtr *indexBuffer, size_t *indexBufferUsedSize, bool extrudeVertices, Real extrusionDist, unsigned long flags=0)
 Define a default implementation of method from ShadowCaster which implements no shadows. More...
 
const AnygetUserAny (void) const
 
UserObjectBindingsgetUserObjectBindings ()
 Return an instance of user objects binding associated with this class. More...
 
const UserObjectBindingsgetUserObjectBindings () const
 Return an instance of user objects binding associated with this class. More...
 
uint32 getVisibilityFlags (void) const
 Returns the visibility flags relevant for this object. More...
 
bool getVisible (void) const
 Gets this object whether to be visible or not, if it has a renderable component. More...
 
virtual const AxisAlignedBoxgetWorldBoundingBox (bool derive=false) const
 Retrieves the axis-aligned bounding box for this object in world coordinates. More...
 
virtual const SpheregetWorldBoundingSphere (bool derive=false) const
 Retrieves the worldspace bounding sphere for this object. More...
 
bool isAttached (void) const
 Returns true if this object is attached to a SceneNode or TagPoint. More...
 
bool isDebugDisplayEnabled (void) const
 Gets whether debug display of this object is enabled. More...
 
virtual bool isInScene (void) const
 Returns true if this object is attached to a SceneNode or TagPoint, and this SceneNode / TagPoint is currently in an active part of the scene graph. More...
 
bool isParentTagPoint () const
 Gets whether the parent node is a TagPoint (or a SceneNode) More...
 
virtual bool isVisible (void) const
 Returns whether or not this object is supposed to be visible or not. More...
 
const LightListqueryLights (void) 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 setCastShadows (bool enabled)
 Sets whether or not this object will cast shadows. More...
 
void setDebugDisplayEnabled (bool enabled)
 Sets whether or not the debug display of this object is enabled. 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 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...
 
virtual void setRenderQueueGroupAndPriority (uint8 queueID, ushort priority)
 Sets the render queue group and group priority this entity will be rendered through. More...
 
void setUserAny (const Any &anything)
 
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::ShadowCaster
virtual ~ShadowCaster ()
 
virtual ShadowRenderableListIterator getShadowVolumeRenderableIterator (ShadowTechnique shadowTechnique, const Light *light, HardwareIndexBufferSharedPtr *indexBuffer, size_t *indexBufferUsedSize, bool extrudeVertices, Real extrusionDistance, unsigned long flags=0)
 
bool hasEdgeList ()
 Returns whether the object has a valid edge list. 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 StringVectorgetAnimableValueNames (void) const
 Gets a list of animable value names for this object. More...
 
- Public Member Functions inherited from Ogre::Renderable
 Renderable ()
 
virtual ~Renderable ()
 Virtual destructor needed as class has virtual methods. 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...
 
virtual bool getCastsShadows (void) const
 Method which reports whether this renderable would normally cast a shadow. More...
 
const Vector4getCustomParameter (size_t index) const
 Gets the custom value associated with this Renderable at the given index. More...
 
virtual unsigned short getNumWorldTransforms (void) const
 Returns the number of world transform matrices this renderable requires. More...
 
bool getPolygonModeOverrideable (void) const
 Gets whether this renderable's chosen detail level can be overridden (downgraded) by the camera setting. More...
 
const RenderSystemDataPtrgetRenderSystemData () const
 
virtual TechniquegetTechnique (void) const
 Retrieves a pointer to the Material Technique this renderable object uses. More...
 
bool getUseIdentityProjection (void) const
 Returns whether or not to use an 'identity' projection. More...
 
bool getUseIdentityView (void) const
 Returns whether or not to use an 'identity' view. More...
 
const AnygetUserAny (void) const
 
UserObjectBindingsgetUserObjectBindings ()
 Return an instance of user objects binding associated with this class. More...
 
const UserObjectBindingsgetUserObjectBindings () const
 Return an instance of user objects binding associated with this class. More...
 
bool hasCustomParameter (size_t index) const
 Checks whether a custom value is associated with this Renderable at the given index. More...
 
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 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...
 
void setPolygonModeOverrideable (bool override)
 Sets whether this renderable's chosen detail level can be overridden (downgraded) by the camera setting. More...
 
void setRenderSystemData (RenderSystemDataPtr val) const
 
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...
 
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...
 

Additional Inherited Members

- Static Public Member Functions inherited from Ogre::MovableObject
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 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 Public Member Functions inherited from Ogre::ShadowCaster
static void clearShadowRenderableList (ShadowRenderableList &shadowRenderables)
 Common implementation of releasing shadow renderables. More...
 
static void extrudeVertices (const HardwareVertexBufferSharedPtr &vertexBuffer, size_t originalVertexCount, const Vector4 &lightPos, Real extrudeDist)
 Utility method for extruding vertices based on a light. 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.

Member Typedef Documentation

◆ Corners

typedef Vector3 Ogre::Frustum::Corners[8]

Constructor & Destructor Documentation

◆ Frustum()

Ogre::Frustum::Frustum ( const String name = BLANKSTRING)

Named constructor.

◆ ~Frustum()

virtual Ogre::Frustum::~Frustum ( )
virtual

Member Function Documentation

◆ setFOVy()

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

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).

◆ getFOVy()

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

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

◆ setNearClipDistance()

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

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

◆ getNearClipDistance()

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

Sets the position of the near clipping plane.

◆ setFarClipDistance()

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

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
farDistThe 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.

◆ getFarClipDistance()

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

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

◆ setAspectRatio()

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

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.

◆ getAspectRatio()

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

Retrieves the current aspect ratio.

◆ setFrustumOffset() [1/2]

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

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
offsetThe horizontal and vertical plane offsets.

◆ setFrustumOffset() [2/2]

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

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
horizontalThe horizontal plane offset.
verticalThe vertical plane offset.

◆ getFrustumOffset()

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

Retrieves the frustum offsets.

◆ setFocalLength()

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

Sets frustum focal length (used in stereo rendering).

Parameters
focalLengthThe distance to the focal plane from the frustum in world coordinates.

◆ getFocalLength()

Real Ogre::Frustum::getFocalLength ( ) const

Returns focal length of frustum.

◆ setFrustumExtents()

void Ogre::Frustum::setFrustumExtents ( Real  left,
Real  right,
Real  top,
Real  bottom 
)

Manually set the extents of the frustum.

Parameters
left,right,top,bottomThe position where the side clip planes intersect the near clip plane, in eye space

◆ resetFrustumExtents()

void Ogre::Frustum::resetFrustumExtents ( )

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

◆ getFrustumExtents() [1/2]

RealRect Ogre::Frustum::getFrustumExtents ( ) const

Get the extents of the frustum in view space.

◆ getFrustumExtents() [2/2]

void Ogre::Frustum::getFrustumExtents ( Real outleft,
Real outright,
Real outtop,
Real outbottom 
) const
Deprecated:
This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

◆ getProjectionMatrixRS()

const Matrix4& Ogre::Frustum::getProjectionMatrixRS ( void  ) const

Gets the projection matrix for this frustum adjusted for the current rendersystem specifics (may be right or left-handed, depth range may vary).

Remarks
This method retrieves the rendering-API dependent version of the projection matrix. If you want a 'typical' projection matrix then use getProjectionMatrix.

◆ getProjectionMatrixWithRSDepth()

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

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], and the range must be kept the same between programmable and fixed-function pipelines.

◆ getProjectionMatrix()

const Matrix4& Ogre::Frustum::getProjectionMatrix ( void  ) 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].

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.

◆ getViewMatrix()

const Affine3& Ogre::Frustum::getViewMatrix ( void  ) const

Gets the view matrix for this frustum.

Mainly for use by OGRE internally.

◆ calcViewMatrixRelative()

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

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)

◆ setCustomViewMatrix()

void Ogre::Frustum::setCustomViewMatrix ( bool  enable,
const Affine3 viewMatrix = Affine3::IDENTITY 
)

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
enableIf 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.
viewMatrixThe custom view matrix to use
See also
Frustum::setCustomProjectionMatrix

◆ isCustomViewMatrixEnabled()

bool Ogre::Frustum::isCustomViewMatrixEnabled ( void  ) const
inline

Returns whether a custom view matrix is in use.

◆ setCustomProjectionMatrix()

void Ogre::Frustum::setCustomProjectionMatrix ( bool  enable,
const Matrix4 projectionMatrix = Matrix4::IDENTITY 
)

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 it's position and orientation.
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.
Parameters
enableIf 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.
projectionMatrixThe custom view matrix to use.
See also
Frustum::setCustomViewMatrix

◆ isCustomProjectionMatrixEnabled()

bool Ogre::Frustum::isCustomProjectionMatrixEnabled ( void  ) const
inline

Returns whether a custom projection matrix is in use.

◆ getFrustumPlanes()

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

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

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

◆ 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.

◆ 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
boundBounding box to be checked (world space).
culledByOptional 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, and Ogre::PCZCamera.

◆ 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
boundBounding sphere to be checked (world space).
culledByOptional 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
vertVertex to be checked (world space).
culledByOptional 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.

◆ getTypeFlags()

uint32 Ogre::Frustum::getTypeFlags ( void  ) const
overridevirtual

Get the 'type flags' for this MovableObject.

Remarks
A type flag identifies the type of the MovableObject as a bitpattern. This is used for categorical inclusion / exclusion in SceneQuery objects. By default, this method returns all ones for objects not created by a MovableObjectFactory (hence always including them); otherwise it returns the value assigned to the MovableObjectFactory. Custom objects which don't use MovableObjectFactory will need to override this if they want to be included in queries.

Reimplemented from Ogre::MovableObject.

◆ getBoundingBox()

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

Retrieves the local axis-aligned bounding box for this object.

Remarks
This bounding box is in local coordinates.

Implements Ogre::MovableObject.

Reimplemented in Ogre::PCZCamera.

◆ getBoundingRadius()

Real Ogre::Frustum::getBoundingRadius ( void  ) const
overridevirtual

Retrieves the radius of the origin-centered bounding sphere for this object.

Implements Ogre::MovableObject.

◆ _updateRenderQueue()

void Ogre::Frustum::_updateRenderQueue ( RenderQueue queue)
overridevirtual

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.

Implements Ogre::MovableObject.

◆ getMovableType()

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

Returns the type name of this object.

Implements Ogre::MovableObject.

◆ _notifyCurrentCamera()

void Ogre::Frustum::_notifyCurrentCamera ( Camera cam)
overridevirtual

Internal method to notify the object of the camera to be used for the next rendering operation.

Remarks
Certain objects may want to do specific processing based on the camera position. This method notifies them in case they wish to do this.

Reimplemented from Ogre::MovableObject.

◆ setMaterial()

void Ogre::Frustum::setMaterial ( const MaterialPtr mat)
Deprecated:
use setDebugColour

◆ setDebugColour()

void Ogre::Frustum::setDebugColour ( const ColourValue col)
inline

◆ getDebugColour()

const ColourValue& Ogre::Frustum::getDebugColour ( ) const
inline

◆ getMaterial()

const MaterialPtr& Ogre::Frustum::getMaterial ( void  ) const
overridevirtual

Retrieves a weak reference to the material this renderable object uses.

Remarks
Note that the Renderable also has the option to override the getTechnique method to specify a particular Technique to use instead of the best one available.

Implements Ogre::Renderable.

◆ getRenderOperation()

void Ogre::Frustum::getRenderOperation ( RenderOperation op)
overridevirtual

Gets the render operation required to send this object to the frame buffer.

Implements Ogre::Renderable.

◆ getWorldTransforms()

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

Gets the world transform matrix / matrices for this renderable object.

Remarks
If the object has any derived transforms, these are expected to be up to date as long as all the SceneNode structures have been updated before this is called.
This method will populate transform with 1 matrix if it does not use vertex blending. If it does use vertex blending it will fill the passed in pointer with an array of matrices, the length being the value returned from getNumWorldTransforms.
Note
Internal Ogre never supports non-affine matrix for world transform matrix/matrices, the behavior is undefined if returns non-affine matrix here.

Implements Ogre::Renderable.

◆ getSquaredViewDepth()

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

Returns the camera-relative squared depth of this renderable.

Remarks
Used to sort transparent objects. Squared depth is used rather than actual depth to avoid having to perform a square root on the result.

Implements Ogre::Renderable.

◆ getLights()

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

Gets a list of lights, ordered relative to how close they are to this renderable.

Remarks
Directional lights, which have no position, will always be first on this list.

Implements Ogre::Renderable.

◆ getWorldSpaceCorners()

virtual const Corners& Ogre::Frustum::getWorldSpaceCorners ( void  ) 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.

◆ setProjectionType()

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

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

Default is perspective.

Reimplemented in Ogre::PCZCamera.

◆ getProjectionType()

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

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

◆ setOrthoWindow()

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

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
wThe width of the view window in world units.
hThe height of the view window in world units.

◆ setOrthoWindowHeight()

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

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
hThe height of the view window in world units.

◆ setOrthoWindowWidth()

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

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
wThe width of the view window in world units.

◆ getOrthoWindowHeight()

Real Ogre::Frustum::getOrthoWindowHeight ( ) const

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

◆ getOrthoWindowWidth()

Real Ogre::Frustum::getOrthoWindowWidth ( ) const

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

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

◆ enableReflection() [1/2]

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

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.

◆ enableReflection() [2/2]

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

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.

◆ disableReflection()

void Ogre::Frustum::disableReflection ( void  )

Disables reflection modification previously turned on with enableReflection.

◆ isReflected()

bool Ogre::Frustum::isReflected ( void  ) const
inline

Returns whether this frustum is being reflected.

◆ getReflectionMatrix()

const Affine3& Ogre::Frustum::getReflectionMatrix ( void  ) const
inline

Returns the reflection matrix of the frustum if appropriate.

◆ getReflectionPlane()

const Plane& Ogre::Frustum::getReflectionPlane ( void  ) const
inline

Returns the reflection plane of the frustum if appropriate.

◆ 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
sphereThe world-space sphere to project.
leftPointers to destination values, these will be completed with the normalised device coordinates (in the range {-1,1}).
topPointers to destination values, these will be completed with the normalised device coordinates (in the range {-1,1}).
rightPointers to destination values, these will be completed with the normalised device coordinates (in the range {-1,1}).
bottomPointers 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.

◆ enableCustomNearClipPlane() [1/2]

void Ogre::Frustum::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.

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
planeThe 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]

void Ogre::Frustum::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.

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
planeThe 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.

◆ disableCustomNearClipPlane()

void Ogre::Frustum::disableCustomNearClipPlane ( void  )

Disables any custom near clip plane.

◆ isCustomNearClipPlaneEnabled()

bool Ogre::Frustum::isCustomNearClipPlaneEnabled ( void  ) const
inline

Is a custom near clip plane in use?

◆ visitRenderables()

void Ogre::Frustum::visitRenderables ( Renderable::Visitor visitor,
bool  debugRenderables = false 
)
virtual

Method to allow a caller to abstractly iterate over the Renderable instances that this MovableObject will add to the render queue when asked, if any.

Parameters
visitorPointer to a class implementing the Renderable::Visitor interface which will be called back for each Renderable which will be queued. Bear in mind that the state of the Renderable instances may not be finalised depending on when you call this.
debugRenderablesIf false, only regular renderables will be visited (those for normal display). If true, debug renderables will be included too.

Implements Ogre::MovableObject.

◆ getPositionForViewUpdate()

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

Get the derived position of this frustum.

Reimplemented in Ogre::Camera.

◆ getOrientationForViewUpdate()

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

Get the derived orientation of this frustum.

Reimplemented in Ogre::Camera.

◆ getPlaneBoundedVolume()

PlaneBoundedVolume Ogre::Frustum::getPlaneBoundedVolume ( )

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

◆ 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.

◆ 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.

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: