Open CASCADE Technology  7.3.1.dev
Data Structures | Public Types | Public Member Functions
Graphic3d_Camera Class Reference

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

#include <Graphic3d_Camera.hxx>

Inheritance diagram for Graphic3d_Camera:
Inheritance graph
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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. More...
 

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) More...
 
 Graphic3d_Camera (const Handle< Graphic3d_Camera > &theOther)
 Copy constructor. More...
 
void CopyMappingData (const Handle< Graphic3d_Camera > &theOtherCamera)
 Initialize mapping related parameters from other camera handle. More...
 
void CopyOrientationData (const Handle< Graphic3d_Camera > &theOtherCamera)
 Initialize orientation related parameters from other camera handle. More...
 
void Copy (const Handle< Graphic3d_Camera > &theOther)
 Copy properties of another camera. More...
 
Public camera properties
void SetEye (const gp_Pnt &theEye)
 Sets camera Eye position. More...
 
const gp_PntEye () const
 Get camera Eye position. More...
 
void SetCenter (const gp_Pnt &theCenter)
 Sets Center of the camera. More...
 
const gp_PntCenter () const
 Get Center of the camera. More...
 
void SetUp (const gp_Dir &theUp)
 Sets camera Up direction vector, orthogonal to camera direction. More...
 
void OrthogonalizeUp ()
 Orthogonalize up direction vector. More...
 
gp_Dir OrthogonalizedUp () const
 Return a copy of orthogonalized up direction vector. More...
 
const gp_DirUp () const
 Get camera Up direction vector. More...
 
void SetAxialScale (const gp_XYZ &theAxialScale)
 Set camera axial scale. More...
 
const gp_XYZAxialScale () const
 Get camera axial scale. More...
 
void SetDistance (const Standard_Real theDistance)
 Set distance of Eye from camera Center. More...
 
Standard_Real Distance () const
 Get distance of Eye from camera Center. More...
 
void SetDirection (const gp_Dir &theDir)
 Sets camera look direction. More...
 
gp_Dir Direction () const
 Get camera look direction. More...
 
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. More...
 
Standard_Real Scale () const
 Get camera scale. More...
 
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. More...
 
Projection ProjectionType () const
 
Standard_Boolean IsOrthographic () const
 Check that the camera projection is orthographic. More...
 
Standard_Boolean IsStereo () const
 Check whether the camera projection is stereo. Please note that stereo rendering is now implemented with support of Quad buffering. More...
 
void SetFOVy (const Standard_Real theFOVy)
 Set Field Of View (FOV) in y axis for perspective projection. More...
 
Standard_Real FOVy () const
 Get Field Of View (FOV) in y axis. More...
 
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. More...
 
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. More...
 
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. More...
 
Standard_Real ZNear () const
 Get the Near Z-clipping plane position. More...
 
Standard_Real ZFar () const
 Get the Far Z-clipping plane position. More...
 
void SetAspect (const Standard_Real theAspect)
 Changes width / height display ratio. More...
 
Standard_Real Aspect () const
 Get camera display ratio. More...
 
void SetZFocus (const FocusType theType, const Standard_Real theZFocus)
 Sets stereographic focus distance. More...
 
Standard_Real ZFocus () const
 Get stereographic focus value. More...
 
FocusType ZFocusType () const
 Get stereographic focus definition type. More...
 
void SetIOD (const IODType theType, const Standard_Real theIOD)
 Sets Intraocular distance. More...
 
Standard_Real IOD () const
 Get Intraocular distance value. More...
 
IODType GetIODType () const
 Get Intraocular distance definition type. More...
 
const Graphic3d_CameraTileTile () const
 Get current tile. More...
 
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. More...
 
Basic camera operations
void Transform (const gp_Trsf &theTrsf)
 Transform orientation components of the camera: Eye, Up and Center points. More...
 
gp_XYZ ViewDimensions () const
 Calculate view plane size at center (target) point and distance between ZFar and ZNear planes. More...
 
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. More...
 
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. More...
 
Projection methods
gp_Pnt Project (const gp_Pnt &thePnt) const
 Project point from world coordinate space to normalized device coordinates (mapping). More...
 
gp_Pnt UnProject (const gp_Pnt &thePnt) const
 Unproject point from normalized device coordinates to world coordinate space. More...
 
gp_Pnt ConvertView2Proj (const gp_Pnt &thePnt) const
 Convert point from view coordinate space to projection coordinate space. More...
 
gp_Pnt ConvertProj2View (const gp_Pnt &thePnt) const
 Convert point from projection coordinate space to view coordinate space. More...
 
gp_Pnt ConvertWorld2View (const gp_Pnt &thePnt) const
 Convert point from world coordinate space to view coordinate space. More...
 
gp_Pnt ConvertView2World (const gp_Pnt &thePnt) const
 Convert point from view coordinate space to world coordinates. More...
 
Camera modification state
const Graphic3d_WorldViewProjStateWorldViewProjState () const
 
Standard_Size ProjectionState () const
 Returns modification state of camera projection matrix. More...
 
Standard_Size WorldViewState () const
 Returns modification state of camera world view transformation matrix. More...
 
Lazily-computed orientation and projection matrices derived from camera parameters
const Graphic3d_Mat4dOrientationMatrix () const
 Get orientation matrix. More...
 
const Graphic3d_Mat4OrientationMatrixF () const
 Get orientation matrix of Standard_ShortReal precision. More...
 
const Graphic3d_Mat4dProjectionMatrix () const
 Get monographic or middle point projection matrix used for monographic rendering and for point projection / unprojection. More...
 
const Graphic3d_Mat4ProjectionMatrixF () const
 Get monographic or middle point projection matrix of Standard_ShortReal precision used for monographic rendering and for point projection / unprojection. More...
 
const Graphic3d_Mat4dProjectionStereoLeft () const
 
const Graphic3d_Mat4ProjectionStereoLeftF () const
 
const Graphic3d_Mat4dProjectionStereoRight () const
 
const Graphic3d_Mat4ProjectionStereoRightF () const
 
void InvalidateProjection ()
 Invalidate state of projection matrix. The matrix will be updated on request. More...
 
void InvalidateOrientation ()
 Invalidate orientation matrix. The matrix will be updated on request. More...
 
- Public Member Functions inherited from Standard_Transient
 Standard_Transient ()
 Empty constructor. More...
 
 Standard_Transient (const Standard_Transient &)
 Copy constructor – does nothing. More...
 
Standard_Transientoperator= (const Standard_Transient &)
 Assignment operator, needed to avoid copying reference counter. More...
 
virtual ~Standard_Transient ()
 Destructor must be virtual. More...
 
virtual void Delete () const
 Memory deallocator for transient classes. More...
 
virtual const opencascade::handle< Standard_Type > & DynamicType () const
 Returns a type descriptor about this object. More...
 
Standard_Boolean IsInstance (const opencascade::handle< Standard_Type > &theType) const
 Returns a true value if this is an instance of Type. More...
 
Standard_Boolean IsInstance (const Standard_CString theTypeName) const
 Returns a true value if this is an instance of TypeName. More...
 
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. More...
 
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. More...
 
Standard_TransientThis () 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. More...
 
Standard_Integer GetRefCount () const
 Get the reference counter of this object. More...
 
void IncrementRefCounter () const
 Increments the reference counter of this object. More...
 
Standard_Integer DecrementRefCounter () const
 Decrements the reference counter of this object; returns the decremented value. More...
 

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
 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. More...
 

Additional Inherited Members

- Static Public Member Functions inherited from Standard_Transient
static const char * get_type_name ()
 Returns a type descriptor about this object. More...
 
static const opencascade::handle< Standard_Type > & get_type_descriptor ()
 Returns type descriptor of Standard_Transient class. More...
 

Detailed Description

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

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

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

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()

const gp_Pnt& Graphic3d_Camera::Center ( ) const
inline

Get Center of the camera.

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()

gp_Dir Graphic3d_Camera::Direction ( ) const

Get camera look direction.

Returns
camera look direction.

◆ Distance()

Standard_Real Graphic3d_Camera::Distance ( ) const

Get distance of Eye from camera Center.

Returns
the distance.

◆ Eye()

const gp_Pnt& Graphic3d_Camera::Eye ( ) const
inline

Get camera Eye position.

Returns
camera eye location.

◆ 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

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.

◆ 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.

◆ 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.

◆ 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.

◆ 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.

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

◆ SetDirection()

void Graphic3d_Camera::SetDirection ( const gp_Dir theDir)

Sets camera look 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.

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

◆ SetFOVy()

void Graphic3d_Camera::SetFOVy ( const Standard_Real  theFOVy)

Set Field Of View (FOV) in y axis for perspective projection.

Parameters
theFOVy[in] the FOV in degrees.

◆ 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
theProjectionType[in] 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
theTiletile definition

◆ SetUp()

void Graphic3d_Camera::SetUp ( const gp_Dir theUp)

Sets camera Up direction vector, orthogonal to camera direction.

Parameters
theUp[in] the Up direction vector.

◆ 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.

◆ 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]

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
theScaleFactor[in] 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.
theMinMax[in] applicative min max boundaries.
theScaleFactor[in] real graphical boundaries (not accounting infinite flag).

◆ ZFitAll() [2/2]

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.

◆ 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: