class SG_EXPORT osg::Camera

Camera class for encapsulating the view position and orientation and projection (lens) used.

Inheritance:

Public Methods

Camera()

virtual ~Camera()

const ProjectionType getProjectionType() const

Get the projection type set by setOtho,setOtho2D,setFrustum, and set perspective methods

void setOrtho(const double left, const double right, const double bottom, const double top, const double zNear, const double zFar)

Set a orthographics projection.

void setOrtho2D(const double left, const double right, const double bottom, const double top)

Set a 2D orthographics projection.

void setFrustum(const double left, const double right, const double bottom, const double top, const double zNear, const double zFar)

Set a perspective projection.

void setPerspective(const double fovy, const double aspectRatio, const double zNear, const double zFar)

Set a sysmetical perspective projection, See gluPerspective for further details.

void setNearFar(const double zNear, const double zFar)

Set the near and far clipping planes

void adjustAspectRatio(const double newAspectRatio, const AdjustAxis aa = ADJUST_HORIZONTAL)

Adjust the clipping planes to account for a new window aspcect ratio.

const double left() const

const double right() const

const double top() const

const double bottom() const

const double zNear() const

const double zFar() const

const double calc_fovy() const

Calculate and return the equivilant fovx for the current project setting.

const double calc_fovx() const

Calculate and return the equivilant fovy for the current project setting.

const double calc_aspectRatio() const

Calculate and return the projection aspect ratio.

const Matrix& getProjectionMatrix() const

const LookAtType getLookAtType() const

void home()

hardwired home view for now, looking straight down the Z axis at the origin, with 'up' being the y axis

void setView(const Vec3& eyePoint, const Vec3& lookPoint, const Vec3& upVector)

Set the View, the up vector should be orthogonal to the look vector.

void setLookAt(const Vec3& eye, const Vec3& center, const Vec3& up)

set the position and orientaion of the camera, using the same convention as gluLookAt

void setLookAt(const double eyeX, const double eyeY, const double eyeZ, const double centerX, const double centerY, const double centerZ, const double upX, const double upY, const double upZ)

set the position and orientaion of the camera, using the same convention as gluLookAt

void transformLookAt(const Matrix& matrix)

post multiple the existing eye point and orientation by matrix.

void ensureOrthogonalUpVector()

inline const Vec3& getEyePoint() const

get the eye point.

inline const Vec3& getCenterPoint() const

get the center point.

inline const Vec3& getUpVector() const

get the up vector

const Vec3 getLookVector() const

calculate look vector

const Vec3 getSideVector() const

calculate side vector

inline const float getFocalLength() const

get focal distance

void attachTransform(const TransformMode mode, Matrix* modelTransform=0)

Attach a transform matrix which is applied after the camera look at.

void dirtyTransform()

must be called after you modify an attachedTransform.

Matrix* getTransform(const TransformMode mode)

const Matrix* getTransform(const TransformMode mode) const

const Vec3 getEyePoint_Model() const

const Vec3 getCenterPoint_Model() const

const Vec3 getLookVector_Model() const

const Vec3 getUpVector_Model() const

const Vec3 getSideVector_Model() const

const Matrix& getModelViewMatrix() const

Get the ModelView matrix.

void setUseNearClippingPlane(const bool use)

const bool getUseNearClippingPlane() const

void setUseFarClippingPlane(const bool use)

const bool getUseFarClippingPlane() const

const ClippingVolume& getClippingVolume() const

get the view frustum clipping in model coordinates

const bool project(const Vec3& obj, const int* viewport, Vec3& win) const

Map object coordinates into windows coordinates.

const bool unproject(const Vec3& win, const int* viewport, Vec3& obj) const

Map window coordinates into object coordinates.

Public Members

enum ProjectionType

Range of projection types.

enum AdjustAxis

Use in combination with adjustAspectRatio, to control the change in frustum clipping planes to account for changes in windows aspect ratio,

enum LookAtType

enum TransformMode

Protected Fields

ProjectionType _projectionType

double _left

double _right

double _bottom

double _top

double _zNear

double _zFar

LookAtType _lookAtType

Vec3 _eye

Vec3 _center

Vec3 _up

double _focalLength

TransformMode _attachedTransformMode

ref_ptr<Matrix> _eyeToModelTransform

ref_ptr<Matrix> _modelToEyeTransform

bool _useNearClippingPlane

bool _useFarClippingPlane

mutable bool _dirty

mutable ref_ptr<Matrix> _projectionMatrix

mutable ref_ptr<Matrix> _modelViewMatrix

mutable ClippingVolume _clippingVolume

mutable ref_ptr<Matrix> _MP

mutable ref_ptr<Matrix> _inverseMP

Protected Methods

Camera(const Camera&)

Camera& operator=(const Camera&)

void calculateMatricesAndClippingVolume() const

Inherited from Referenced:

Public Methods

inline Referenced& operator = (Referenced&)

inline void ref() const

inline void unref() const

inline const int referenceCount() const

Protected Fields

mutable int _refCount

Documentation

Camera class for encapsulating the view position and orientation and projection (lens) used. Creates a projection and modelview matrices which can be used to set OpenGL's PROJECTION and MODELVIEW matrices represectively.

Camera()

virtual ~Camera()

enum ProjectionType

Range of projection types. OTHO2D is a special case of OTHO where the near and far planes are equal to -1 and 1 respectively. PRESPECTIVE is a special case of FRUSTUM where the left & right and bottom and top and symetrical.

ORTHO

ORTHO2D

FRUSTUM

PERSPECTIVE

const ProjectionType getProjectionType() const

Get the projection type set by setOtho,setOtho2D,setFrustum, and set perspective methods

void setOrtho(const double left, const double right, const double bottom, const double top, const double zNear, const double zFar)

Set a orthographics projection. See glOrtho for further details.

void setOrtho2D(const double left, const double right, const double bottom, const double top)

Set a 2D orthographics projection. See gluOrtho2D for further details.

void setFrustum(const double left, const double right, const double bottom, const double top, const double zNear, const double zFar)

Set a perspective projection. See glFrustum for further details.

void setPerspective(const double fovy, const double aspectRatio, const double zNear, const double zFar)

Set a sysmetical perspective projection, See gluPerspective for further details. Aspect ratio is defined as width/height.

void setNearFar(const double zNear, const double zFar)

Set the near and far clipping planes

enum AdjustAxis

Use in combination with adjustAspectRatio, to control the change in frustum clipping planes to account for changes in windows aspect ratio,

ADJUST_VERTICAL

ADJUST_HORIZONTAL

void adjustAspectRatio(const double newAspectRatio, const AdjustAxis aa = ADJUST_HORIZONTAL)

Adjust the clipping planes to account for a new window aspcect ratio. Typicall used after resizeing a window. Aspect ratio is defined as width/height.

const double left() const

const double right() const

const double top() const

const double bottom() const

const double zNear() const

const double zFar() const

const double calc_fovy() const

Calculate and return the equivilant fovx for the current project setting. This value is only valid for when a symetric persepctive projection exists. i.e. getProjectionType()==PERSPECTIVE.

const double calc_fovx() const

Calculate and return the equivilant fovy for the current project setting. This value is only valid for when a symetric persepctive projection exists. i.e. getProjectionType()==PERSPECTIVE.

const double calc_aspectRatio() const

Calculate and return the projection aspect ratio. Aspect ratio is defined as width/height.

const Matrix& getProjectionMatrix() const

enum LookAtType

USE_HOME_POSITON

USE_EYE_AND_QUATERNION

USE_EYE_CENTER_AND_UP

const LookAtType getLookAtType() const

void home()

hardwired home view for now, looking straight down the Z axis at the origin, with 'up' being the y axis

void setView(const Vec3& eyePoint, const Vec3& lookPoint, const Vec3& upVector)

Set the View, the up vector should be orthogonal to the look vector. setView is now mapped to setLookAt(eye,center,up), and is only kept for backwards compatibility.

void setLookAt(const Vec3& eye, const Vec3& center, const Vec3& up)

set the position and orientaion of the camera, using the same convention as gluLookAt

void setLookAt(const double eyeX, const double eyeY, const double eyeZ, const double centerX, const double centerY, const double centerZ, const double upX, const double upY, const double upZ)

set the position and orientaion of the camera, using the same convention as gluLookAt

void transformLookAt(const Matrix& matrix)

post multiple the existing eye point and orientation by matrix. note, does not affect any ModelTransforms that are applied.

void ensureOrthogonalUpVector()

inline const Vec3& getEyePoint() const

get the eye point.

inline const Vec3& getCenterPoint() const

get the center point.

inline const Vec3& getUpVector() const

get the up vector

const Vec3 getLookVector() const

calculate look vector

const Vec3 getSideVector() const

calculate side vector

inline const float getFocalLength() const

get focal distance

enum TransformMode

EYE_TO_MODEL

MODEL_TO_EYE

NO_ATTACHED_TRANSFORM

void attachTransform(const TransformMode mode, Matrix* modelTransform=0)

Attach a transform matrix which is applied after the camera look at. The attached matrix can work in two ways, either as transform of the eye into the model coordinates - EYE_TO_MODEL, or as a transform of the model to the eye - MODEL_TO_EYE. The former is equivilant to attaching a camera internal to the scene graph. The later is equivilant to adding a osg::Transform at root of the scene to move the scene to the eye point. Typical used in conjunction with the LookAt position set to home, in which case it is simply treated as a model view matrix. If the same behaviour as IRIS Performer's setViewMat is desired then set the LookAt to be (0,0,0),(0,1,0),(0,0,1) since Performer's default direction is along the y axis, unlike OpenGL and the default OSG. If modelTransfor is NULL then do not use any model transform - just use the basic LookAt values. note: Camera internals maintains the both EYE_TO_MODEL and MODEL_TO_EYE internally and ensures that they are the inverse of one another. However, if you modify the attached transform then you must call dirtyTransform, to allow the OSG to update matrices accordingly.

void dirtyTransform()

must be called after you modify an attachedTransform.

Matrix* getTransform(const TransformMode mode)

const Matrix* getTransform(const TransformMode mode) const

const Vec3 getEyePoint_Model() const

const Vec3 getCenterPoint_Model() const

const Vec3 getLookVector_Model() const

const Vec3 getUpVector_Model() const

const Vec3 getSideVector_Model() const

const Matrix& getModelViewMatrix() const

Get the ModelView matrix. If a ModelTransform is supplied then the ModelView matrix is created by multipling the current LookAt by ModelTransform. Otherwise it is simply created by using the current LookAt, equivialent to using gluLookAt.

void setUseNearClippingPlane(const bool use)

const bool getUseNearClippingPlane() const

void setUseFarClippingPlane(const bool use)

const bool getUseFarClippingPlane() const

const ClippingVolume& getClippingVolume() const

get the view frustum clipping in model coordinates

const bool project(const Vec3& obj, const int* viewport, Vec3& win) const

Map object coordinates into windows coordinates. Equivilant to gluProject(...).

const bool unproject(const Vec3& win, const int* viewport, Vec3& obj) const

Map window coordinates into object coordinates. Equivilant to gluUnProject(...).

Camera(const Camera&)

Camera& operator=(const Camera&)

ProjectionType _projectionType

double _left

double _right

double _bottom

double _top

double _zNear

double _zFar

LookAtType _lookAtType

Vec3 _eye

Vec3 _center

Vec3 _up

double _focalLength

TransformMode _attachedTransformMode

ref_ptr<Matrix> _eyeToModelTransform

ref_ptr<Matrix> _modelToEyeTransform

bool _useNearClippingPlane

bool _useFarClippingPlane

mutable bool _dirty

mutable ref_ptr<Matrix> _projectionMatrix

mutable ref_ptr<Matrix> _modelViewMatrix

mutable ClippingVolume _clippingVolume

mutable ref_ptr<Matrix> _MP

mutable ref_ptr<Matrix> _inverseMP

void calculateMatricesAndClippingVolume() const

This class has no child classes.

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