Graphic3d_Camera Class Reference

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...
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 occ::handle< Graphic3d_Camera > &theOther)
	Copy constructor.
void	CopyMappingData (const occ::handle< Graphic3d_Camera > &theOtherCamera)
	Initialize mapping related parameters from other camera handle.
void	CopyOrientationData (const occ::handle< Graphic3d_Camera > &theOtherCamera)
	Initialize orientation related parameters from other camera handle.
void	Copy (const occ::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.
double	Distance () const
	Get distance of Eye from camera Center.
void	SetDistance (const double theDistance)
	Set distance of Eye from camera Center.
double	Scale () const
	Get camera scale.
void	SetScale (const double 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
bool	IsOrthographic () const
	Check that the camera projection is orthographic.
bool	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 double 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.
double	FOVy () const
	Get Field Of View (FOV) in y axis.
double	FOVx () const
	Get Field Of View (FOV) in x axis.
double	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 (double theFOV)
	Set Field Of View (FOV) restriction for 2D on-screen elements.
bool	FitMinMax (const Bnd_Box &theBox, const double theResolution, const bool theToEnlargeIfLine)
	Adjust camera to fit in specified AABB.
bool	ZFitAll (const double theScaleFactor, const Bnd_Box &theMinMax, const Bnd_Box &theGraphicBB, double &theZNear, double &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 double 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 double theZNear, const double 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.
double	ZNear () const
	Get the Near Z-clipping plane position.
double	ZFar () const
	Get the Far Z-clipping plane position.
bool	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 (bool theIsZeroToOne)
	Set using [0, 1] depth range or [-1, 1] range.
void	SetAspect (const double theAspect)
	Changes width / height display ratio.
double	Aspect () const
	Get camera display ratio.
void	SetZFocus (const FocusType theType, const double theZFocus)
	Sets stereographic focus distance.
double	ZFocus () const
	Get stereographic focus value.
FocusType	ZFocusType () const
	Get stereographic focus definition type.
void	SetIOD (const IODType theType, const double theIOD)
	Sets Intraocular distance.
double	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 double theZValue) const
	Calculate view plane size at center point with specified Z offset and distance between ZFar and ZNear planes.
double	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.
double	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
size_t	ProjectionState () const
	Returns modification state of camera projection matrix.
size_t	WorldViewState () const
	Returns modification state of camera world view transformation matrix.
Lazily-computed orientation and projection matrices derived from camera parameters
const NCollection_Mat4< double > &	OrientationMatrix () const
	Get orientation matrix.
const NCollection_Mat4< float > &	OrientationMatrixF () const
	Get orientation matrix of float precision.
const NCollection_Mat4< double > &	ProjectionMatrix () const
	Get monographic or middle point projection matrix used for monographic rendering and for point projection / unprojection.
const NCollection_Mat4< float > &	ProjectionMatrixF () const
	Get monographic or middle point projection matrix of float precision used for monographic rendering and for point projection / unprojection.
const NCollection_Mat4< double > &	ProjectionStereoLeft () const
const NCollection_Mat4< float > &	ProjectionStereoLeftF () const
const NCollection_Mat4< double > &	ProjectionStereoRight () const
const NCollection_Mat4< float > &	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 (NCollection_Mat4< double > &theProjL, NCollection_Mat4< double > &theHeadToEyeL, NCollection_Mat4< double > &theProjR, NCollection_Mat4< double > &theHeadToEyeR) const
	Get stereo projection matrices.
void	StereoProjectionF (NCollection_Mat4< float > &theProjL, NCollection_Mat4< float > &theHeadToEyeL, NCollection_Mat4< float > &theProjR, NCollection_Mat4< float > &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< double > &theFrustumL, const Aspect_FrustumLRBT< double > &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 NCollection_Mat4< double > &theProjL, const NCollection_Mat4< double > &theHeadToEyeL, const NCollection_Mat4< double > &theProjR, const NCollection_Mat4< double > &theHeadToEyeR)
	Set custom stereo projection matrices.
bool	IsCustomMonoProjection () const
	Return TRUE if custom projection matrix is set.
void	SetCustomMonoProjection (const NCollection_Mat4< double > &theProj)
	Set custom projection matrix.
void	DumpJson (Standard_OStream &theOStream, int 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 ()=default
	Destructor must be virtual.
virtual const opencascade::handle< Standard_Type > &	DynamicType () const
	Returns a type descriptor about this object.
bool	IsInstance (const opencascade::handle< Standard_Type > &theType) const
	Returns a true value if this is an instance of Type.
bool	IsInstance (const char *const theTypeName) const
	Returns a true value if this is an instance of TypeName.
bool	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.
bool	IsKind (const char *const 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.
int	GetRefCount () const noexcept
	Get the reference counter of this object.
void	IncrementRefCounter () noexcept
	Increments the reference counter of this object. Uses relaxed memory ordering since incrementing only requires atomicity, not synchronization with other memory operations.
int	DecrementRefCounter () noexcept
	Decrements the reference counter of this object; returns the decremented value. Uses release ordering for the decrement to ensure all writes to the object are visible before the count reaches zero. An acquire fence is added only when the count reaches zero, ensuring proper synchronization before deletion. This is more efficient than using acq_rel for every decrement.
virtual void	Delete () const
	Memory deallocator for transient classes.

Static Public Member Functions
static void	Interpolate (const occ::handle< Graphic3d_Camera > &theStart, const occ::handle< Graphic3d_Camera > &theEnd, const double theT, occ::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 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< NCollection_Vec3< double > > &thePoints, const NCollection_Mat4< double > &theModelWorld=NCollection_Mat4< double >()) 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 occ::handle< Graphic3d_Camera > &

theOther

)

Copy constructor.

Parameters

[in]

theOther

the camera to copy from.

Member Function Documentation

Aspect()

double 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

[in]

thePnt

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

[in]

thePnt

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

[in]

thePnt

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

[in]

thePnt

the 3D point in WCS.

Returns

point in VCS.

Copy()

void Graphic3d_Camera::Copy

(

const occ::handle< Graphic3d_Camera > &

theOther

)

Copy properties of another camera.

Parameters

[in]

theOther

the camera to copy from.

CopyMappingData()

void Graphic3d_Camera::CopyMappingData

(

const occ::handle< Graphic3d_Camera > &

theOtherCamera

)

Initialize mapping related parameters from other camera handle.

CopyOrientationData()

void Graphic3d_Camera::CopyOrientationData

(

const occ::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()

double Graphic3d_Camera::Distance ( ) const

inline

Get distance of Eye from camera Center.

Returns

the distance.

DumpJson()

void Graphic3d_Camera::DumpJson	(	Standard_OStream &	theOStream,
		int	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 double	theResolution,
		const bool	theToEnlargeIfLine )

Adjust camera to fit in specified AABB.

FOV2d()

double 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()

double Graphic3d_Camera::FOVx ( ) const

inline

Get Field Of View (FOV) in x axis.

Returns

the FOV value in degrees.

FOVy()

double 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

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

FrustumPoints()

void Graphic3d_Camera::FrustumPoints	(	NCollection_Array1< NCollection_Vec3< double > > &	thePoints,
		const NCollection_Mat4< double > &	theModelWorld = NCollection_Mat4< double >() ) 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()

void Graphic3d_Camera::Interpolate ( const occ::handle< Graphic3d_Camera > & theStart, const occ::handle< Graphic3d_Camera > & theEnd, const double theT, occ::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

NCollection_Lerp<occ::handle<Graphic3d_Camera>>

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

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

double 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()

bool 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()

bool 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()

bool 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

[in]

theEye

the location of camera's Eye.

See also

SetEye()

NDC2dOffsetX()

double 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()

double 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 NCollection_Mat4< double > & Graphic3d_Camera::OrientationMatrix

(

)

const

Get orientation matrix.

Returns

camera orientation matrix.

OrientationMatrixF()

const NCollection_Mat4< float > & Graphic3d_Camera::OrientationMatrixF

(

)

const

Get orientation matrix of float 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

[in]

thePnt

the 3D point in WCS.

Returns

mapped point in NDC.

ProjectionMatrix()

const NCollection_Mat4< double > & 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 NCollection_Mat4< float > & Graphic3d_Camera::ProjectionMatrixF

(

)

const

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

Returns

monographic projection matrix.

ProjectionState()

size_t Graphic3d_Camera::ProjectionState ( ) const

inline

Returns modification state of camera projection matrix.

ProjectionStereoLeft()

const NCollection_Mat4< double > & 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 NCollection_Mat4< float > & Graphic3d_Camera::ProjectionStereoLeftF

(

)

const

Returns

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

ProjectionStereoRight()

const NCollection_Mat4< double > & 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 NCollection_Mat4< float > & Graphic3d_Camera::ProjectionStereoRightF

(

)

const

Returns

stereographic matrix of float 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()

double Graphic3d_Camera::Scale

(

)

const

Get camera scale.

Returns

camera scale factor.

SetAspect()

void Graphic3d_Camera::SetAspect

(

const double

theAspect

)

Changes width / height display ratio.

Parameters

[in]

theAspect

the display ratio.

SetAxialScale()

void Graphic3d_Camera::SetAxialScale

(

const gp_XYZ &

theAxialScale

)

Set camera axial scale.

Parameters

[in]

theAxialScale

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

[in]

theCenter

the point where the camera looks at.

SetCustomMonoProjection()

void Graphic3d_Camera::SetCustomMonoProjection

(

const NCollection_Mat4< double > &

theProj

)

Set custom projection matrix.

SetCustomStereoFrustums()

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

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

SetCustomStereoProjection()

void Graphic3d_Camera::SetCustomStereoProjection	(	const NCollection_Mat4< double > &	theProjL,
		const NCollection_Mat4< double > &	theHeadToEyeL,
		const NCollection_Mat4< double > &	theProjR,
		const NCollection_Mat4< double > &	theHeadToEyeR )

Set custom stereo projection matrices.

Parameters

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

[in]

theDir

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

[in]

theDir

the direction.

SetDistance()

void Graphic3d_Camera::SetDistance

(

const double

theDistance

)

Set distance of Eye from camera Center.

Parameters

[in]

theDistance

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

[in]

theEye

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

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

SetFOV2d()

void Graphic3d_Camera::SetFOV2d

(

double

theFOV

)

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

SetFOVy()

void Graphic3d_Camera::SetFOVy

(

const double

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

[in]

theFOVy

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 double	theIOD )

Sets Intraocular distance.

Parameters

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

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

[in]

theScale

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

[in]

theUp

the Up direction vector.

See also

OrthogonalizeUp().

SetZeroToOneDepth()

void Graphic3d_Camera::SetZeroToOneDepth ( bool theIsZeroToOne )

inline

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

SetZFocus()

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

Sets stereographic focus distance.

Parameters

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

SetZRange()

void Graphic3d_Camera::SetZRange	(	const double	theZNear,
		const double	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

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

SideRight()

gp_Dir Graphic3d_Camera::SideRight ( ) const

inline

Right side direction.

StereoProjection()

void Graphic3d_Camera::StereoProjection	(	NCollection_Mat4< double > &	theProjL,
		NCollection_Mat4< double > &	theHeadToEyeL,
		NCollection_Mat4< double > &	theProjR,
		NCollection_Mat4< double > &	theHeadToEyeR ) const

Get stereo projection matrices.

Parameters

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

StereoProjectionF()

void Graphic3d_Camera::StereoProjectionF	(	NCollection_Mat4< float > &	theProjL,
		NCollection_Mat4< float > &	theHeadToEyeL,
		NCollection_Mat4< float > &	theProjR,
		NCollection_Mat4< float > &	theHeadToEyeR ) const

Get stereo projection matrices.

Parameters

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

[in]

theTrsf

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

[in]

thePnt

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 double

theZValue

)

const

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

Parameters

[in]

theZValue

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()

size_t Graphic3d_Camera::WorldViewState ( ) const

inline

Returns modification state of camera world view transformation matrix.

ZFar()

double 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 double 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 double	theScaleFactor,
		const Bnd_Box &	theMinMax,
		const Bnd_Box &	theGraphicBB,
		double &	theZNear,
		double &	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()

double 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()

double 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