Forward declaration. More...

#include <Graphic3d_Camera.hxx>

Inheritance diagram for Graphic3d_Camera:

Public Types
enum	Projection { Projection_Orthographic , Projection_Perspective , Projection_Stereo , Projection_MonoLeftEye , Projection_MonoRightEye }
	Enumerates supported monographic projections. More...

enum	FocusType { FocusType_Absolute , FocusType_Relative }
	Enumerates approaches to define stereographic focus. More...

enum	IODType { IODType_Absolute , IODType_Relative }
	Enumerates approaches to define Intraocular distance. More...

Public Types inherited from Standard_Transient
typedef void	base_type
	Returns a type descriptor about this object.

Public Member Functions
	Graphic3d_Camera ()
	Default constructor. Initializes camera with the following properties: Eye (0, 0, -2); Center (0, 0, 0); Up (0, 1, 0); Type (Orthographic); FOVy (45); Scale (1000); IsStereo(false); ZNear (0.001); ZFar (3000.0); Aspect(1); ZFocus(1.0); ZFocusType(Relative); IOD(0.05); IODType(Relative)

	Graphic3d_Camera (const Handle< Graphic3d_Camera > &theOther)
	Copy constructor.

void	CopyMappingData (const Handle< Graphic3d_Camera > &theOtherCamera)
	Initialize mapping related parameters from other camera handle.

void	CopyOrientationData (const Handle< Graphic3d_Camera > &theOtherCamera)
	Initialize orientation related parameters from other camera handle.

void	Copy (const Handle< Graphic3d_Camera > &theOther)
	Copy properties of another camera.

Public camera properties
const gp_Dir &	Direction () const
	Get camera look direction.

void	SetDirectionFromEye (const gp_Dir &theDir)
	Sets camera look direction preserving the current Eye() position. WARNING! This method does NOT verify that the current Up() vector is orthogonal to the new Direction.

void	SetDirection (const gp_Dir &theDir)
	Sets camera look direction and computes the new Eye position relative to current Center. WARNING! This method does NOT verify that the current Up() vector is orthogonal to the new Direction.

const gp_Dir &	Up () const
	Get camera Up direction vector.

void	SetUp (const gp_Dir &theUp)
	Sets camera Up direction vector, orthogonal to camera direction. WARNING! This method does NOT verify that the new Up vector is orthogonal to the current Direction().

void	OrthogonalizeUp ()
	Orthogonalize up direction vector.

gp_Dir	OrthogonalizedUp () const
	Return a copy of orthogonalized up direction vector.

gp_Dir	SideRight () const
	Right side direction.

const gp_Pnt &	Eye () const
	Get camera Eye position.

void	MoveEyeTo (const gp_Pnt &theEye)
	Sets camera Eye position. Unlike SetEye(), this method only changes Eye point and preserves camera direction.

void	SetEyeAndCenter (const gp_Pnt &theEye, const gp_Pnt &theCenter)
	Sets camera Eye and Center positions.

void	SetEye (const gp_Pnt &theEye)
	Sets camera Eye position. WARNING! For backward compatibility reasons, this method also changes view direction, so that the new direction is computed from new Eye position to old Center position.

gp_Pnt	Center () const
	Get Center of the camera, e.g. the point where camera looks at. This point is computed as Eye() translated along Direction() at Distance().

void	SetCenter (const gp_Pnt &theCenter)
	Sets Center of the camera, e.g. the point where camera looks at. This methods changes camera direction, so that the new direction is computed from current Eye position to specified Center position.

Standard_Real	Distance () const
	Get distance of Eye from camera Center.

void	SetDistance (const Standard_Real theDistance)
	Set distance of Eye from camera Center.

Standard_Real	Scale () const
	Get camera scale.

void	SetScale (const Standard_Real theScale)
	Sets camera scale. For orthographic projection the scale factor corresponds to parallel scale of view mapping (i.e. size of viewport). For perspective camera scale is converted to distance. The scale specifies equal size of the view projection in both dimensions assuming that the aspect is 1.0. The projection height and width are specified with the scale and correspondingly multiplied by the aspect.

const gp_XYZ &	AxialScale () const
	Get camera axial scale.

void	SetAxialScale (const gp_XYZ &theAxialScale)
	Set camera axial scale.

void	SetProjectionType (const Projection theProjection)
	Change camera projection type. When switching to perspective projection from orthographic one, the ZNear and ZFar are reset to default values (0.001, 3000.0) if less than 0.0.

Projection	ProjectionType () const

Standard_Boolean	IsOrthographic () const
	Check that the camera projection is orthographic.

Standard_Boolean	IsStereo () const
	Check whether the camera projection is stereo. Please note that stereo rendering is now implemented with support of Quad buffering.

void	SetFOVy (const Standard_Real theFOVy)
	Set Field Of View (FOV) in y axis for perspective projection. Field of View in x axis is automatically scaled from view aspect ratio.

Standard_Real	FOVy () const
	Get Field Of View (FOV) in y axis.

Standard_Real	FOVx () const
	Get Field Of View (FOV) in x axis.

Standard_Real	FOV2d () const
	Get Field Of View (FOV) restriction for 2D on-screen elements; 180 degrees by default. When 2D FOV is smaller than FOVy or FOVx, 2D elements defined within offset from view corner will be extended to fit into specified 2D FOV. This can be useful to make 2D elements sharply visible, like in case of HMD normally having extra large FOVy.

void	SetFOV2d (Standard_Real theFOV)
	Set Field Of View (FOV) restriction for 2D on-screen elements.

bool	FitMinMax (const Bnd_Box &theBox, const Standard_Real theResolution, const bool theToEnlargeIfLine)
	Adjust camera to fit in specified AABB.

bool	ZFitAll (const Standard_Real theScaleFactor, const Bnd_Box &theMinMax, const Bnd_Box &theGraphicBB, Standard_Real &theZNear, Standard_Real &theZFar) const
	Estimate Z-min and Z-max planes of projection volume to match the displayed objects. The methods ensures that view volume will be close by depth range to the displayed objects. Fitting assumes that for orthogonal projection the view volume contains the displayed objects completely. For zoomed perspective view, the view volume is adjusted such that it contains the objects or their parts, located in front of the camera.

void	ZFitAll (const Standard_Real theScaleFactor, const Bnd_Box &theMinMax, const Bnd_Box &theGraphicBB)
	Change Z-min and Z-max planes of projection volume to match the displayed objects.

void	SetZRange (const Standard_Real theZNear, const Standard_Real theZFar)
	Change the Near and Far Z-clipping plane positions. For orthographic projection, theZNear, theZFar can be negative or positive. For perspective projection, only positive values are allowed. Program error exception is raised if non-positive values are specified for perspective projection or theZNear >= theZFar.

Standard_Real	ZNear () const
	Get the Near Z-clipping plane position.

Standard_Real	ZFar () const
	Get the Far Z-clipping plane position.

Standard_Boolean	IsZeroToOneDepth () const
	Return TRUE if camera should calculate projection matrix for [0, 1] depth range or for [-1, 1] range. FALSE by default.

void	SetZeroToOneDepth (Standard_Boolean theIsZeroToOne)
	Set using [0, 1] depth range or [-1, 1] range.

void	SetAspect (const Standard_Real theAspect)
	Changes width / height display ratio.

Standard_Real	Aspect () const
	Get camera display ratio.

void	SetZFocus (const FocusType theType, const Standard_Real theZFocus)
	Sets stereographic focus distance.

Standard_Real	ZFocus () const
	Get stereographic focus value.

FocusType	ZFocusType () const
	Get stereographic focus definition type.

void	SetIOD (const IODType theType, const Standard_Real theIOD)
	Sets Intraocular distance.

Standard_Real	IOD () const
	Get Intraocular distance value.

IODType	GetIODType () const
	Get Intraocular distance definition type.

const Graphic3d_CameraTile &	Tile () const
	Get current tile.

void	SetTile (const Graphic3d_CameraTile &theTile)
	Sets the Tile defining the drawing sub-area within View. Note that tile defining a region outside the view boundaries is also valid - use method Graphic3d_CameraTile::Cropped() to assign a cropped copy.

void	SetIdentityOrientation ()
	Sets camera parameters to make current orientation matrix identity one.

Basic camera operations
void	Transform (const gp_Trsf &theTrsf)
	Transform orientation components of the camera: Eye, Up and Center points.

gp_XYZ	ViewDimensions () const
	Calculate view plane size at center (target) point and distance between ZFar and ZNear planes.

gp_XYZ	ViewDimensions (const Standard_Real theZValue) const
	Calculate view plane size at center point with specified Z offset and distance between ZFar and ZNear planes.

Standard_Real	NDC2dOffsetX () const
	Return offset to the view corner in NDC space within dimension X for 2d on-screen elements, which is normally 0.5. Can be clamped when FOVx exceeds FOV2d.

Standard_Real	NDC2dOffsetY () const
	Return offset to the view corner in NDC space within dimension X for 2d on-screen elements, which is normally 0.5. Can be clamped when FOVy exceeds FOV2d.

void	Frustum (gp_Pln &theLeft, gp_Pln &theRight, gp_Pln &theBottom, gp_Pln &theTop, gp_Pln &theNear, gp_Pln &theFar) const
	Calculate WCS frustum planes for the camera projection volume. Frustum is a convex volume determined by six planes directing inwards. The frustum planes are usually used as inputs for camera algorithms. Thus, if any changes to projection matrix calculation are necessary, the frustum planes calculation should be also touched.

Projection methods
gp_Pnt	Project (const gp_Pnt &thePnt) const
	Project point from world coordinate space to normalized device coordinates (mapping).

gp_Pnt	UnProject (const gp_Pnt &thePnt) const
	Unproject point from normalized device coordinates to world coordinate space.

gp_Pnt	ConvertView2Proj (const gp_Pnt &thePnt) const
	Convert point from view coordinate space to projection coordinate space.

gp_Pnt	ConvertProj2View (const gp_Pnt &thePnt) const
	Convert point from projection coordinate space to view coordinate space.

gp_Pnt	ConvertWorld2View (const gp_Pnt &thePnt) const
	Convert point from world coordinate space to view coordinate space.

gp_Pnt	ConvertView2World (const gp_Pnt &thePnt) const
	Convert point from view coordinate space to world coordinates.

Camera modification state
const Graphic3d_WorldViewProjState &	WorldViewProjState () const

Standard_Size	ProjectionState () const
	Returns modification state of camera projection matrix.

Standard_Size	WorldViewState () const
	Returns modification state of camera world view transformation matrix.

Lazily-computed orientation and projection matrices derived from camera parameters
const Graphic3d_Mat4d &	OrientationMatrix () const
	Get orientation matrix.

const Graphic3d_Mat4 &	OrientationMatrixF () const
	Get orientation matrix of Standard_ShortReal precision.

const Graphic3d_Mat4d &	ProjectionMatrix () const
	Get monographic or middle point projection matrix used for monographic rendering and for point projection / unprojection.

const Graphic3d_Mat4 &	ProjectionMatrixF () const
	Get monographic or middle point projection matrix of Standard_ShortReal precision used for monographic rendering and for point projection / unprojection.

const Graphic3d_Mat4d &	ProjectionStereoLeft () const

const Graphic3d_Mat4 &	ProjectionStereoLeftF () const

const Graphic3d_Mat4d &	ProjectionStereoRight () const

const Graphic3d_Mat4 &	ProjectionStereoRightF () const

void	InvalidateProjection ()
	Invalidate state of projection matrix. The matrix will be updated on request.

void	InvalidateOrientation ()
	Invalidate orientation matrix. The matrix will be updated on request.

void	StereoProjection (Graphic3d_Mat4d &theProjL, Graphic3d_Mat4d &theHeadToEyeL, Graphic3d_Mat4d &theProjR, Graphic3d_Mat4d &theHeadToEyeR) const
	Get stereo projection matrices.

void	StereoProjectionF (Graphic3d_Mat4 &theProjL, Graphic3d_Mat4 &theHeadToEyeL, Graphic3d_Mat4 &theProjR, Graphic3d_Mat4 &theHeadToEyeR) const
	Get stereo projection matrices.

void	ResetCustomProjection ()
	Unset all custom frustums and projection matrices.

bool	IsCustomStereoFrustum () const
	Return TRUE if custom stereo frustums are set.

void	SetCustomStereoFrustums (const Aspect_FrustumLRBT< Standard_Real > &theFrustumL, const Aspect_FrustumLRBT< Standard_Real > &theFrustumR)
	Set custom stereo frustums. These can be retrieved from APIs like OpenVR.

bool	IsCustomStereoProjection () const
	Return TRUE if custom stereo projection matrices are set.

void	SetCustomStereoProjection (const Graphic3d_Mat4d &theProjL, const Graphic3d_Mat4d &theHeadToEyeL, const Graphic3d_Mat4d &theProjR, const Graphic3d_Mat4d &theHeadToEyeR)
	Set custom stereo projection matrices.

bool	IsCustomMonoProjection () const
	Return TRUE if custom projection matrix is set.

void	SetCustomMonoProjection (const Graphic3d_Mat4d &theProj)
	Set custom projection matrix.

void	DumpJson (Standard_OStream &theOStream, Standard_Integer theDepth=-1) const
	Dumps the content of me into the stream.

Public Member Functions inherited from Standard_Transient
	Standard_Transient ()
	Empty constructor.

	Standard_Transient (const Standard_Transient &)
	Copy constructor – does nothing.

Standard_Transient &	operator= (const Standard_Transient &)
	Assignment operator, needed to avoid copying reference counter.

virtual	~Standard_Transient ()
	Destructor must be virtual.

virtual const opencascade::handle< Standard_Type > &	DynamicType () const
	Returns a type descriptor about this object.

Standard_Boolean	IsInstance (const opencascade::handle< Standard_Type > &theType) const
	Returns a true value if this is an instance of Type.

Standard_Boolean	IsInstance (const Standard_CString theTypeName) const
	Returns a true value if this is an instance of TypeName.

Standard_Boolean	IsKind (const opencascade::handle< Standard_Type > &theType) const
	Returns true if this is an instance of Type or an instance of any class that inherits from Type. Note that multiple inheritance is not supported by OCCT RTTI mechanism.

Standard_Boolean	IsKind (const Standard_CString theTypeName) const
	Returns true if this is an instance of TypeName or an instance of any class that inherits from TypeName. Note that multiple inheritance is not supported by OCCT RTTI mechanism.

Standard_Transient *	This () const
	Returns non-const pointer to this object (like const_cast). For protection against creating handle to objects allocated in stack or call from constructor, it will raise exception Standard_ProgramError if reference counter is zero.

Standard_Integer	GetRefCount () const noexcept
	Get the reference counter of this object.

void	IncrementRefCounter () noexcept
	Increments the reference counter of this object.

Standard_Integer	DecrementRefCounter () noexcept
	Decrements the reference counter of this object; returns the decremented value.

virtual void	Delete () const
	Memory deallocator for transient classes.

Static Public Member Functions
static void	Interpolate (const Handle< Graphic3d_Camera > &theStart, const Handle< Graphic3d_Camera > &theEnd, const double theT, Handle< Graphic3d_Camera > &theCamera)
	Linear interpolation tool for camera orientation and position. This tool interpolates camera parameters scale, eye, center, rotation (up and direction vectors) independently.

Static Public Member Functions inherited from Standard_Transient
static constexpr const char *	get_type_name ()
	Returns a type descriptor about this object.

static const opencascade::handle< Standard_Type > &	get_type_descriptor ()
	Returns type descriptor of Standard_Transient class.

Managing projection and orientation cache
enum	{ FrustumVert_LeftBottomNear , FrustumVert_LeftBottomFar , FrustumVert_LeftTopNear , FrustumVert_LeftTopFar , FrustumVert_RightBottomNear , FrustumVert_RightBottomFar , FrustumVert_RightTopNear , FrustumVert_RightTopFar , FrustumVerticesNB }
	Enumerates vertices of view volume. More...

void	FrustumPoints (NCollection_Array1< Graphic3d_Vec3d > &thePoints, const Graphic3d_Mat4d &theModelWorld=Graphic3d_Mat4d()) const
	Fill array of current view frustum corners. The size of this array is equal to FrustumVerticesNB. The order of vertices is as defined in FrustumVert_* enumeration.

Detailed Description

Forward declaration.

Camera class provides object-oriented approach to setting up projection and orientation properties of 3D view.

Member Enumeration Documentation

◆ anonymous enum

anonymous enum

Enumerates vertices of view volume.

Enumerator
FrustumVert_LeftBottomNear
FrustumVert_LeftBottomFar
FrustumVert_LeftTopNear
FrustumVert_LeftTopFar
FrustumVert_RightBottomNear
FrustumVert_RightBottomFar
FrustumVert_RightTopNear
FrustumVert_RightTopFar
FrustumVerticesNB

◆ FocusType

enum Graphic3d_Camera::FocusType

Enumerates approaches to define stereographic focus.

FocusType_Absolute : focus is specified as absolute value.
FocusType_Relative : focus is specified relative to (as coefficient of) camera focal length.

Enumerator
FocusType_Absolute
FocusType_Relative

◆ IODType

enum Graphic3d_Camera::IODType

Enumerates approaches to define Intraocular distance.

IODType_Absolute : Intraocular distance is defined as absolute value.
IODType_Relative : Intraocular distance is defined relative to (as coefficient of) camera focal length.

Enumerator
IODType_Absolute
IODType_Relative

◆ Projection

enum Graphic3d_Camera::Projection

Enumerates supported monographic projections.

Projection_Orthographic : orthographic projection.
Projection_Perspective : perspective projection.
Projection_Stereo : stereographic projection.
Projection_MonoLeftEye : mono projection for stereo left eye.
Projection_MonoRightEye : mono projection for stereo right eye.

Enumerator
Projection_Orthographic
Projection_Perspective
Projection_Stereo
Projection_MonoLeftEye
Projection_MonoRightEye

Constructor & Destructor Documentation

◆ Graphic3d_Camera() [1/2]

Graphic3d_Camera::Graphic3d_Camera ( )

Default constructor. Initializes camera with the following properties: Eye (0, 0, -2); Center (0, 0, 0); Up (0, 1, 0); Type (Orthographic); FOVy (45); Scale (1000); IsStereo(false); ZNear (0.001); ZFar (3000.0); Aspect(1); ZFocus(1.0); ZFocusType(Relative); IOD(0.05); IODType(Relative)

◆ Graphic3d_Camera() [2/2]

Graphic3d_Camera::Graphic3d_Camera ( const Handle< Graphic3d_Camera > & theOther )

Copy constructor.

Parameters

theOther [in] the camera to copy from.

Member Function Documentation

◆ Aspect()

Standard_Real Graphic3d_Camera::Aspect ( ) const

inline

Get camera display ratio.

Returns: display ratio.

◆ AxialScale()

const gp_XYZ & Graphic3d_Camera::AxialScale ( ) const

inline

Get camera axial scale.

Returns: Camera's axial scale.

◆ Center()

gp_Pnt Graphic3d_Camera::Center ( ) const

inline

Get Center of the camera, e.g. the point where camera looks at. This point is computed as Eye() translated along Direction() at Distance().

Returns: the point where the camera looks at.

◆ ConvertProj2View()

gp_Pnt Graphic3d_Camera::ConvertProj2View ( const gp_Pnt & thePnt ) const

Convert point from projection coordinate space to view coordinate space.

Parameters

thePnt [in] the point in NDC.

Returns: point in VCS.

◆ ConvertView2Proj()

gp_Pnt Graphic3d_Camera::ConvertView2Proj ( const gp_Pnt & thePnt ) const

Convert point from view coordinate space to projection coordinate space.

Parameters

thePnt [in] the point in VCS.

Returns: point in NDC.

◆ ConvertView2World()

gp_Pnt Graphic3d_Camera::ConvertView2World ( const gp_Pnt & thePnt ) const

Convert point from view coordinate space to world coordinates.

Parameters

thePnt [in] the 3D point in VCS.

Returns: point in WCS.

◆ ConvertWorld2View()

gp_Pnt Graphic3d_Camera::ConvertWorld2View ( const gp_Pnt & thePnt ) const

Convert point from world coordinate space to view coordinate space.

Parameters

thePnt [in] the 3D point in WCS.

Returns: point in VCS.

◆ Copy()

void Graphic3d_Camera::Copy ( const Handle< Graphic3d_Camera > & theOther )

Copy properties of another camera.

Parameters

theOther [in] the camera to copy from.

◆ CopyMappingData()

void Graphic3d_Camera::CopyMappingData ( const Handle< Graphic3d_Camera > & theOtherCamera )

Initialize mapping related parameters from other camera handle.

◆ CopyOrientationData()

void Graphic3d_Camera::CopyOrientationData ( const Handle< Graphic3d_Camera > & theOtherCamera )

Initialize orientation related parameters from other camera handle.

◆ Direction()

const gp_Dir & Graphic3d_Camera::Direction ( ) const

inline

Get camera look direction.

Returns: camera look direction.

◆ Distance()

Standard_Real Graphic3d_Camera::Distance ( ) const

inline

Get distance of Eye from camera Center.

Returns: the distance.

◆ DumpJson()

void Graphic3d_Camera::DumpJson	(	Standard_OStream &	theOStream,
		Standard_Integer	theDepth = `-1`
	)		const

Dumps the content of me into the stream.

◆ Eye()

const gp_Pnt & Graphic3d_Camera::Eye ( ) const

inline

Get camera Eye position.

Returns: camera eye location.

◆ FitMinMax()

bool Graphic3d_Camera::FitMinMax	(	const Bnd_Box &	theBox,
		const Standard_Real	theResolution,
		const bool	theToEnlargeIfLine
	)

Adjust camera to fit in specified AABB.

◆ FOV2d()

Standard_Real Graphic3d_Camera::FOV2d ( ) const

inline

Get Field Of View (FOV) restriction for 2D on-screen elements; 180 degrees by default. When 2D FOV is smaller than FOVy or FOVx, 2D elements defined within offset from view corner will be extended to fit into specified 2D FOV. This can be useful to make 2D elements sharply visible, like in case of HMD normally having extra large FOVy.

◆ FOVx()

Standard_Real Graphic3d_Camera::FOVx ( ) const

inline

Get Field Of View (FOV) in x axis.

Returns: the FOV value in degrees.

◆ FOVy()

Standard_Real Graphic3d_Camera::FOVy ( ) const

inline

Get Field Of View (FOV) in y axis.

Returns: the FOV value in degrees.

◆ Frustum()

void Graphic3d_Camera::Frustum	(	gp_Pln &	theLeft,
		gp_Pln &	theRight,
		gp_Pln &	theBottom,
		gp_Pln &	theTop,
		gp_Pln &	theNear,
		gp_Pln &	theFar
	)		const

Calculate WCS frustum planes for the camera projection volume. Frustum is a convex volume determined by six planes directing inwards. The frustum planes are usually used as inputs for camera algorithms. Thus, if any changes to projection matrix calculation are necessary, the frustum planes calculation should be also touched.

Parameters

theLeft	[out] the frustum plane for left side of view.
theRight	[out] the frustum plane for right side of view.
theBottom	[out] the frustum plane for bottom side of view.
theTop	[out] the frustum plane for top side of view.
theNear	[out] the frustum plane for near side of view.
theFar	[out] the frustum plane for far side of view.

◆ FrustumPoints()

void Graphic3d_Camera::FrustumPoints	(	NCollection_Array1< Graphic3d_Vec3d > &	thePoints,
		const Graphic3d_Mat4d &	theModelWorld = `Graphic3d_Mat4d()`
	)		const

Fill array of current view frustum corners. The size of this array is equal to FrustumVerticesNB. The order of vertices is as defined in FrustumVert_* enumeration.

◆ GetIODType()

IODType Graphic3d_Camera::GetIODType ( ) const

inline

Get Intraocular distance definition type.

Returns: definition type used for Intraocular distance.

◆ Interpolate()

static void Graphic3d_Camera::Interpolate	(	const Handle< Graphic3d_Camera > &	theStart,
		const Handle< Graphic3d_Camera > &	theEnd,
		const double	theT,
		Handle< Graphic3d_Camera > &	theCamera
	)

static

Linear interpolation tool for camera orientation and position. This tool interpolates camera parameters scale, eye, center, rotation (up and direction vectors) independently.

See also: Graphic3d_CameraLerp

Eye/Center interpolation is performed through defining an anchor point in-between Center and Eye. The anchor position is defined as point near to the camera point which has smaller translation part. The main idea is to keep the distance between Center and Eye (which will change if Center and Eye translation will be interpolated independently). E.g.:

When both Center and Eye are moved at the same vector -> both will be just translated by straight line;
When Center is not moved -> camera Eye will move around Center through arc;
When Eye is not moved -> camera Center will move around Eye through arc;
When both Center and Eye are move by different vectors -> transformation will be something in between, and will try interpolate linearly the distance between Center and Eye.

This transformation might be not in line with user expectations. In this case, application might define intermediate camera positions for interpolation or implement own interpolation logic.

Parameters

theStart	[in] initial camera position
theEnd	[in] final camera position
theT	[in] step between initial and final positions within [0,1] range
theCamera	[out] interpolation result

◆ InvalidateOrientation()

void Graphic3d_Camera::InvalidateOrientation ( )

Invalidate orientation matrix. The matrix will be updated on request.

◆ InvalidateProjection()

void Graphic3d_Camera::InvalidateProjection ( )

Invalidate state of projection matrix. The matrix will be updated on request.

◆ IOD()

Standard_Real Graphic3d_Camera::IOD ( ) const

inline

Get Intraocular distance value.

Returns: absolute or relative IOD value depending on its definition type.

◆ IsCustomMonoProjection()

bool Graphic3d_Camera::IsCustomMonoProjection ( ) const

inline

Return TRUE if custom projection matrix is set.

◆ IsCustomStereoFrustum()

bool Graphic3d_Camera::IsCustomStereoFrustum ( ) const

inline

Return TRUE if custom stereo frustums are set.

◆ IsCustomStereoProjection()

bool Graphic3d_Camera::IsCustomStereoProjection ( ) const

inline

Return TRUE if custom stereo projection matrices are set.

◆ IsOrthographic()

Standard_Boolean Graphic3d_Camera::IsOrthographic ( ) const

inline

Check that the camera projection is orthographic.

Returns: boolean flag that indicates whether the camera's projection is orthographic or not.

◆ IsStereo()

Standard_Boolean Graphic3d_Camera::IsStereo ( ) const

inline

Check whether the camera projection is stereo. Please note that stereo rendering is now implemented with support of Quad buffering.

Returns: boolean flag indicating whether the stereographic L/R projection is chosen.

◆ IsZeroToOneDepth()

Standard_Boolean Graphic3d_Camera::IsZeroToOneDepth ( ) const

inline

Return TRUE if camera should calculate projection matrix for [0, 1] depth range or for [-1, 1] range. FALSE by default.

◆ MoveEyeTo()

void Graphic3d_Camera::MoveEyeTo ( const gp_Pnt & theEye )

Sets camera Eye position. Unlike SetEye(), this method only changes Eye point and preserves camera direction.

Parameters

theEye [in] the location of camera's Eye.

See also: SetEye()

◆ NDC2dOffsetX()

Standard_Real Graphic3d_Camera::NDC2dOffsetX ( ) const

inline

Return offset to the view corner in NDC space within dimension X for 2d on-screen elements, which is normally 0.5. Can be clamped when FOVx exceeds FOV2d.

◆ NDC2dOffsetY()

Standard_Real Graphic3d_Camera::NDC2dOffsetY ( ) const

inline

Return offset to the view corner in NDC space within dimension X for 2d on-screen elements, which is normally 0.5. Can be clamped when FOVy exceeds FOV2d.

◆ OrientationMatrix()

const Graphic3d_Mat4d & Graphic3d_Camera::OrientationMatrix ( ) const

Get orientation matrix.

Returns: camera orientation matrix.

◆ OrientationMatrixF()

const Graphic3d_Mat4 & Graphic3d_Camera::OrientationMatrixF ( ) const

Get orientation matrix of Standard_ShortReal precision.

Returns: camera orientation matrix.

◆ OrthogonalizedUp()

gp_Dir Graphic3d_Camera::OrthogonalizedUp ( ) const

Return a copy of orthogonalized up direction vector.

◆ OrthogonalizeUp()

void Graphic3d_Camera::OrthogonalizeUp ( )

Orthogonalize up direction vector.

◆ Project()

gp_Pnt Graphic3d_Camera::Project ( const gp_Pnt & thePnt ) const

Project point from world coordinate space to normalized device coordinates (mapping).

Parameters

thePnt [in] the 3D point in WCS.

Returns: mapped point in NDC.

◆ ProjectionMatrix()

const Graphic3d_Mat4d & Graphic3d_Camera::ProjectionMatrix ( ) const

Get monographic or middle point projection matrix used for monographic rendering and for point projection / unprojection.

Returns: monographic projection matrix.

◆ ProjectionMatrixF()

const Graphic3d_Mat4 & Graphic3d_Camera::ProjectionMatrixF ( ) const

Get monographic or middle point projection matrix of Standard_ShortReal precision used for monographic rendering and for point projection / unprojection.

Returns: monographic projection matrix.

◆ ProjectionState()

Standard_Size Graphic3d_Camera::ProjectionState ( ) const

inline

Returns modification state of camera projection matrix.

◆ ProjectionStereoLeft()

const Graphic3d_Mat4d & Graphic3d_Camera::ProjectionStereoLeft ( ) const

Returns: stereographic matrix computed for left eye. Please note that this method is used for rendering for Projection_Stereo.

◆ ProjectionStereoLeftF()

const Graphic3d_Mat4 & Graphic3d_Camera::ProjectionStereoLeftF ( ) const

Returns: stereographic matrix of Standard_ShortReal precision computed for left eye. Please note that this method is used for rendering for Projection_Stereo.

◆ ProjectionStereoRight()

const Graphic3d_Mat4d & Graphic3d_Camera::ProjectionStereoRight ( ) const

Returns: stereographic matrix computed for right eye. Please note that this method is used for rendering for Projection_Stereo.

◆ ProjectionStereoRightF()

const Graphic3d_Mat4 & Graphic3d_Camera::ProjectionStereoRightF ( ) const

Returns: stereographic matrix of Standard_ShortReal precision computed for right eye. Please note that this method is used for rendering for Projection_Stereo.

◆ ProjectionType()

Projection Graphic3d_Camera::ProjectionType ( ) const

inline

Returns: camera projection type.

◆ ResetCustomProjection()

void Graphic3d_Camera::ResetCustomProjection ( )

Unset all custom frustums and projection matrices.

◆ Scale()

Standard_Real Graphic3d_Camera::Scale ( ) const

Get camera scale.

Returns: camera scale factor.

◆ SetAspect()

void Graphic3d_Camera::SetAspect ( const Standard_Real theAspect )

Changes width / height display ratio.

Parameters

theAspect [in] the display ratio.

◆ SetAxialScale()

void Graphic3d_Camera::SetAxialScale ( const gp_XYZ & theAxialScale )

Set camera axial scale.

Parameters

theAxialScale [in] the axial scale vector.

◆ SetCenter()

void Graphic3d_Camera::SetCenter ( const gp_Pnt & theCenter )

Sets Center of the camera, e.g. the point where camera looks at. This methods changes camera direction, so that the new direction is computed from current Eye position to specified Center position.

Parameters

theCenter [in] the point where the camera looks at.

◆ SetCustomMonoProjection()

void Graphic3d_Camera::SetCustomMonoProjection ( const Graphic3d_Mat4d & theProj )

Set custom projection matrix.

◆ SetCustomStereoFrustums()

void Graphic3d_Camera::SetCustomStereoFrustums	(	const Aspect_FrustumLRBT< Standard_Real > &	theFrustumL,
		const Aspect_FrustumLRBT< Standard_Real > &	theFrustumR
	)

Set custom stereo frustums. These can be retrieved from APIs like OpenVR.

◆ SetCustomStereoProjection()

void Graphic3d_Camera::SetCustomStereoProjection	(	const Graphic3d_Mat4d &	theProjL,
		const Graphic3d_Mat4d &	theHeadToEyeL,
		const Graphic3d_Mat4d &	theProjR,
		const Graphic3d_Mat4d &	theHeadToEyeR
	)

Set custom stereo projection matrices.

Parameters

theProjL	[in] left eye projection matrix
theHeadToEyeL	[in] left head to eye translation matrix
theProjR	[in] right eye projection matrix
theHeadToEyeR	[in] right head to eye translation matrix

◆ SetDirection()

void Graphic3d_Camera::SetDirection ( const gp_Dir & theDir )

Sets camera look direction and computes the new Eye position relative to current Center. WARNING! This method does NOT verify that the current Up() vector is orthogonal to the new Direction.

Parameters

theDir [in] the direction.

◆ SetDirectionFromEye()

void Graphic3d_Camera::SetDirectionFromEye ( const gp_Dir & theDir )

Sets camera look direction preserving the current Eye() position. WARNING! This method does NOT verify that the current Up() vector is orthogonal to the new Direction.

Parameters

theDir [in] the direction.

◆ SetDistance()

void Graphic3d_Camera::SetDistance ( const Standard_Real theDistance )

Set distance of Eye from camera Center.

Parameters

theDistance [in] the distance.

◆ SetEye()

void Graphic3d_Camera::SetEye ( const gp_Pnt & theEye )

Sets camera Eye position. WARNING! For backward compatibility reasons, this method also changes view direction, so that the new direction is computed from new Eye position to old Center position.

Parameters

theEye [in] the location of camera's Eye.

See also: MoveEyeTo(), SetEyeAndCenter()

◆ SetEyeAndCenter()

void Graphic3d_Camera::SetEyeAndCenter	(	const gp_Pnt &	theEye,
		const gp_Pnt &	theCenter
	)

Sets camera Eye and Center positions.

Parameters

theEye	[in] the location of camera's Eye
theCenter	[in] the location of camera's Center

◆ SetFOV2d()

void Graphic3d_Camera::SetFOV2d ( Standard_Real theFOV )

Set Field Of View (FOV) restriction for 2D on-screen elements.

◆ SetFOVy()

void Graphic3d_Camera::SetFOVy ( const Standard_Real theFOVy )

Set Field Of View (FOV) in y axis for perspective projection. Field of View in x axis is automatically scaled from view aspect ratio.

Parameters

theFOVy [in] the FOV in degrees.

◆ SetIdentityOrientation()

void Graphic3d_Camera::SetIdentityOrientation ( )

Sets camera parameters to make current orientation matrix identity one.

◆ SetIOD()

void Graphic3d_Camera::SetIOD	(	const IODType	theType,
		const Standard_Real	theIOD
	)

Sets Intraocular distance.

Parameters

theType	[in] the IOD definition type. IOD can be defined as absolute value or relatively to (as coefficient of) camera focal length.
theIOD	[in] the Intraocular distance.

◆ SetProjectionType()

void Graphic3d_Camera::SetProjectionType ( const Projection theProjection )

Change camera projection type. When switching to perspective projection from orthographic one, the ZNear and ZFar are reset to default values (0.001, 3000.0) if less than 0.0.

Parameters

[in] theProjection the camera projection type.

◆ SetScale()

void Graphic3d_Camera::SetScale ( const Standard_Real theScale )

Sets camera scale. For orthographic projection the scale factor corresponds to parallel scale of view mapping (i.e. size of viewport). For perspective camera scale is converted to distance. The scale specifies equal size of the view projection in both dimensions assuming that the aspect is 1.0. The projection height and width are specified with the scale and correspondingly multiplied by the aspect.

Parameters

theScale [in] the scale factor.

◆ SetTile()

void Graphic3d_Camera::SetTile ( const Graphic3d_CameraTile & theTile )

Sets the Tile defining the drawing sub-area within View. Note that tile defining a region outside the view boundaries is also valid - use method Graphic3d_CameraTile::Cropped() to assign a cropped copy.

Parameters

theTile tile definition

◆ SetUp()

void Graphic3d_Camera::SetUp ( const gp_Dir & theUp )

Sets camera Up direction vector, orthogonal to camera direction. WARNING! This method does NOT verify that the new Up vector is orthogonal to the current Direction().

Parameters

theUp [in] the Up direction vector.

See also: OrthogonalizeUp().

◆ SetZeroToOneDepth()

void Graphic3d_Camera::SetZeroToOneDepth ( Standard_Boolean theIsZeroToOne )

inline

Set using [0, 1] depth range or [-1, 1] range.

◆ SetZFocus()

void Graphic3d_Camera::SetZFocus	(	const FocusType	theType,
		const Standard_Real	theZFocus
	)

Sets stereographic focus distance.

Parameters

theType	[in] the focus definition type. Focus can be defined as absolute value or relatively to (as coefficient of) coefficient of camera focal length.
theZFocus	[in] the focus absolute value or coefficient depending on the passed definition type.

◆ SetZRange()

void Graphic3d_Camera::SetZRange	(	const Standard_Real	theZNear,
		const Standard_Real	theZFar
	)

Change the Near and Far Z-clipping plane positions. For orthographic projection, theZNear, theZFar can be negative or positive. For perspective projection, only positive values are allowed. Program error exception is raised if non-positive values are specified for perspective projection or theZNear >= theZFar.

Parameters

theZNear	[in] the distance of the plane from the Eye.
theZFar	[in] the distance of the plane from the Eye.

◆ SideRight()

gp_Dir Graphic3d_Camera::SideRight ( ) const

inline

Right side direction.

◆ StereoProjection()

void Graphic3d_Camera::StereoProjection	(	Graphic3d_Mat4d &	theProjL,
		Graphic3d_Mat4d &	theHeadToEyeL,
		Graphic3d_Mat4d &	theProjR,
		Graphic3d_Mat4d &	theHeadToEyeR
	)		const

Get stereo projection matrices.

Parameters

theProjL	[out] left eye projection matrix
theHeadToEyeL	[out] left head to eye translation matrix
theProjR	[out] right eye projection matrix
theHeadToEyeR	[out] right head to eye translation matrix

◆ StereoProjectionF()

void Graphic3d_Camera::StereoProjectionF	(	Graphic3d_Mat4 &	theProjL,
		Graphic3d_Mat4 &	theHeadToEyeL,
		Graphic3d_Mat4 &	theProjR,
		Graphic3d_Mat4 &	theHeadToEyeR
	)		const

Get stereo projection matrices.

Parameters

theProjL	[out] left eye projection matrix
theHeadToEyeL	[out] left head to eye translation matrix
theProjR	[out] right eye projection matrix
theHeadToEyeR	[out] right head to eye translation matrix

◆ Tile()

const Graphic3d_CameraTile & Graphic3d_Camera::Tile ( ) const

inline

Get current tile.

◆ Transform()

void Graphic3d_Camera::Transform ( const gp_Trsf & theTrsf )

Transform orientation components of the camera: Eye, Up and Center points.

Parameters

theTrsf [in] the transformation to apply.

◆ UnProject()

gp_Pnt Graphic3d_Camera::UnProject ( const gp_Pnt & thePnt ) const

Unproject point from normalized device coordinates to world coordinate space.

Parameters

thePnt [in] the NDC point.

Returns: 3D point in WCS.

◆ Up()

const gp_Dir & Graphic3d_Camera::Up ( ) const

inline

Get camera Up direction vector.

Returns: Camera's Up direction vector.

◆ ViewDimensions() [1/2]

gp_XYZ Graphic3d_Camera::ViewDimensions ( ) const

inline

Calculate view plane size at center (target) point and distance between ZFar and ZNear planes.

Returns: values in form of gp_Pnt (Width, Height, Depth).

◆ ViewDimensions() [2/2]

gp_XYZ Graphic3d_Camera::ViewDimensions ( const Standard_Real theZValue ) const

Calculate view plane size at center point with specified Z offset and distance between ZFar and ZNear planes.

Parameters

theZValue [in] the distance from the eye in eye-to-center direction

Returns: values in form of gp_Pnt (Width, Height, Depth).

◆ WorldViewProjState()

const Graphic3d_WorldViewProjState & Graphic3d_Camera::WorldViewProjState ( ) const

inline

Returns: projection modification state of the camera.

◆ WorldViewState()

Standard_Size Graphic3d_Camera::WorldViewState ( ) const

inline

Returns modification state of camera world view transformation matrix.

◆ ZFar()

Standard_Real Graphic3d_Camera::ZFar ( ) const

inline

Get the Far Z-clipping plane position.

Returns: the distance of the plane from the Eye.

◆ ZFitAll() [1/2]

void Graphic3d_Camera::ZFitAll	(	const Standard_Real	theScaleFactor,
		const Bnd_Box &	theMinMax,
		const Bnd_Box &	theGraphicBB
	)

inline

Change Z-min and Z-max planes of projection volume to match the displayed objects.

◆ ZFitAll() [2/2]

bool Graphic3d_Camera::ZFitAll	(	const Standard_Real	theScaleFactor,
		const Bnd_Box &	theMinMax,
		const Bnd_Box &	theGraphicBB,
		Standard_Real &	theZNear,
		Standard_Real &	theZFar
	)		const

Estimate Z-min and Z-max planes of projection volume to match the displayed objects. The methods ensures that view volume will be close by depth range to the displayed objects. Fitting assumes that for orthogonal projection the view volume contains the displayed objects completely. For zoomed perspective view, the view volume is adjusted such that it contains the objects or their parts, located in front of the camera.

Parameters

[in]	theScaleFactor	the scale factor for Z-range. The range between Z-min, Z-max projection volume planes evaluated by z fitting method will be scaled using this coefficient. Program error exception is thrown if negative or zero value is passed.
[in]	theMinMax	applicative min max boundaries.
[in]	theGraphicBB	real graphical boundaries (not accounting infinite flag).

◆ ZFocus()

Standard_Real Graphic3d_Camera::ZFocus ( ) const

inline

Get stereographic focus value.

Returns: absolute or relative stereographic focus value depending on its definition type.

◆ ZFocusType()

FocusType Graphic3d_Camera::ZFocusType ( ) const

inline

Get stereographic focus definition type.

Returns: definition type used for stereographic focus.

◆ ZNear()

Standard_Real Graphic3d_Camera::ZNear ( ) const

inline

Get the Near Z-clipping plane position.

Returns: the distance of the plane from the Eye.

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

Graphic3d_Camera.hxx

Public Types

Public Member Functions

Static Public Member Functions

Managing projection and orientation cache

Detailed Description

Member Enumeration Documentation

◆ anonymous enum

◆ FocusType

◆ IODType

◆ Projection

Constructor & Destructor Documentation

◆ Graphic3d_Camera() [1/2]

◆ Graphic3d_Camera() [2/2]

Member Function Documentation

◆ Aspect()

◆ AxialScale()

◆ Center()

◆ ConvertProj2View()

◆ ConvertView2Proj()

◆ ConvertView2World()

◆ ConvertWorld2View()

◆ Copy()

◆ CopyMappingData()

◆ CopyOrientationData()

◆ Direction()

◆ Distance()

◆ DumpJson()

◆ Eye()

◆ FitMinMax()

◆ FOV2d()

◆ FOVx()

◆ FOVy()

◆ Frustum()

◆ FrustumPoints()

◆ GetIODType()

◆ Interpolate()

◆ InvalidateOrientation()

◆ InvalidateProjection()

◆ IOD()

◆ IsCustomMonoProjection()

◆ IsCustomStereoFrustum()

◆ IsCustomStereoProjection()

◆ IsOrthographic()

◆ IsStereo()

◆ IsZeroToOneDepth()

◆ MoveEyeTo()

◆ NDC2dOffsetX()

◆ NDC2dOffsetY()

◆ OrientationMatrix()

◆ OrientationMatrixF()

◆ OrthogonalizedUp()

◆ OrthogonalizeUp()

◆ Project()

◆ ProjectionMatrix()

◆ ProjectionMatrixF()

◆ ProjectionState()

◆ ProjectionStereoLeft()

◆ ProjectionStereoLeftF()

◆ ProjectionStereoRight()

◆ ProjectionStereoRightF()

◆ ProjectionType()

◆ ResetCustomProjection()

◆ Scale()

◆ SetAspect()

◆ SetAxialScale()

◆ SetCenter()

◆ SetCustomMonoProjection()

◆ SetCustomStereoFrustums()

◆ SetCustomStereoProjection()

◆ SetDirection()

◆ SetDirectionFromEye()

◆ SetDistance()

◆ SetEye()

◆ SetEyeAndCenter()

◆ SetFOV2d()

◆ SetFOVy()

◆ SetIdentityOrientation()

◆ SetIOD()

◆ SetProjectionType()

◆ SetScale()