Class Description

This class represents the coordinate system of the scene and can convert scenes to other coordinate systems.

By default the FbxScene uses a Y-Up axis system. If the calling application wishes to change the default axis it will need to define the new axis system and call the convert method with the scene as argument. The appropriate transforms will be applied to the first level objects of the scene only (objects whose parent is the scene itself). Child objects do not need to be transformed since they inherit from their parents. The adjustment will affect the translation animation curves and the objects pivots values (the rotation transformation is applied as a pre-rotation transform therefore the rotation animation curves do not need to be transformed). Once converted, the scene will have its axis definition changed to the new system.

For example:

        FbxScene* lScene = FbxScene::Create(sdkmanager, "MyScene");
        ...
        // the scene is filled with objects

        int dir;
        lScene->GetGlobalSettings().GetAxisSystem().GetUpVector(dir); // this returns the equivalent of FbxAxisSystem::eYAxis

        FbxAxisSystem max; // we desire to convert the scene from Y-Up to Z-Up
        max.ConvertScene(lScene);

        lScene->GetGlobalSettings().GetAxisSystem().GetUpVector(dir); // this will now return the equivalent of FbxAxisSystem::eZAxis

No conversion will take place if the scene current axis system is equal to the new one.

The EUpVector specifies which axis has the up and down direction in the system (typically this is the Y or Z axis). The sign of the EUpVector is applied to represent the direction (1 is up and -1 is down relative to the observer).

The EFrontVector specifies which axis has the front and back direction in the system. It is not an independent variable, which means it depends on EUpVector. The enum values ParityEven and ParityOdd denote the first one and the second one of the remain two axes in addition to the up axis.

For example if the up axis is X, the remain two axes will be Y And Z, so the ParityEven is Y, and the ParityOdd is Z ; If the up axis is Y, the remain two axes will X And Z, so the ParityEven is X, and the ParityOdd is Z; If the up axis is Z, the remain two axes will X And Y, so the ParityEven is X, and the ParityOdd is Y.

There still needs a parameter to denote the direction of the EFrontVector just as the EUpVector. And the sign of the EFrontVector represents the direction (1 is front and -1 is back relative to observer).

If the front axis and the up axis are determined, the third axis will be automatically determined as the left one. The ECoordSystem enum is a parameter to determine the direction of the third axis just as the EUpVector sign. It determines if the axis system is right-handed or left-handed just as the enum values.

Some code for reconstructing a FbxAxisSystem object from reference scene.

        //the reference scene
        FbxScene* lSceneReference = FbxScene::Create(sdkmanager, "ReferenceScene");
        ...
        // the scene is filled with objects

        FbxAxisSystem lAxisSytemReference = lSceneReference->GetGlobalSettings().GetAxisSystem();

        int lUpVectorSign = 1;
        int lFrontVectorSign = 1;

        //get upVector and its sign.
        EUpVector lUpVector = lAxisSsytemReference.getUpVector( lUpVectorSign );

        //get FrontVector and its sign.
        EFrontVector lFrontVector = lAxisSsytemReference.getFrontVector( lFrontVectorSign );

        //get uCoorSystem. 
        ECoordSystem lCoorSystem = lAxisSsytemReference.GetCoorSystem();

        //The FbxAxisSystem object to reconstruct back by saved parameter
        FbxAxisSystem lAxisSytemReconstruct( lUpVectorSign * lUpVector, 
                                                                              lFrontVectorSign * lFrontVector,
                                                                              lCoorSystem);

Examples:: ViewScene/SceneContext.cxx.

Definition at line 97 of file fbxaxissystem.h.

List of all members.

Public Types
enum	EUpVector { eXAxis = 1, eYAxis = 2, eZAxis = 3 }
	Specifies which canonical axis represents up in the system (typically Y or Z). More...
enum	EFrontVector { eParityEven = 1, eParityOdd = 2 }
	Vector with origin at the screen pointing toward the camera. More...
enum	ECoordSystem { eRightHanded, eLeftHanded }
	Specifies the third vector of the system. More...
enum	EPreDefinedAxisSystem { eMayaZUp, eMayaYUp, eMax, eMotionBuilder, eOpenGL, eDirectX, eLightwave }
	Enumeration that can be used to initialize a new instance of this class with predefined configurations (see the "Predefined axis systems" section). More...
Public Member Functions
FbxAxisSystem &	operator= (const FbxAxisSystem &pAxisSystem)
	Assignment operation.
void	ConvertScene (FbxScene *pScene) const
	Convert a scene to this axis system.
void	ConvertScene (FbxScene pScene, FbxNode pFbxRoot) const
	Convert a scene to this axis system by using the specified node as an Fbx_Root.
EFrontVector	GetFrontVector (int &pSign) const
	Get the EFrontVector and its sign of this axis system.
EUpVector	GetUpVector (int &pSign) const
	Get the EUpVector and its sign of this axis system.
ECoordSystem	GetCoorSystem () const
	Accessor to the ECoordSystem of this object.
void	ConvertChildren (FbxNode *pRoot, const FbxAxisSystem &pSrcSystem) const
	Converts the children of the given node to this axis system.
Constructor and Destructor
	FbxAxisSystem ()
	FbxAxisSystem (EUpVector pUpVector, EFrontVector pFrontVector, ECoordSystem pCoorSystem)
	Constructor!
	FbxAxisSystem (const FbxAxisSystem &pAxisSystem)
	Copy constructor!
	FbxAxisSystem (const EPreDefinedAxisSystem pAxisSystem)
	Constructor!
virtual	~FbxAxisSystem ()
	Destructor.
Boolean operation.
bool	operator== (const FbxAxisSystem &pAxisSystem) const
	Equivalence operator.
bool	operator!= (const FbxAxisSystem &pAxisSystem) const
	Non-equivalence operator.
Predefined axis systems.
These static members define the axis system of the most popular applications.
static const FbxAxisSystem	MayaZUp
	Predefined axis system: MayaZUp (UpVector = +Z, FrontVector = -Y, CoordSystem = +X (RightHanded))
static const FbxAxisSystem	MayaYUp
	Predefined axis system: MayaYUp (UpVector = +Y, FrontVector = +Z, CoordSystem = +X (RightHanded))
static const FbxAxisSystem	Max
	Predefined axis system: Max (UpVector = +Z, FrontVector = -Y, CoordSystem = +X (RightHanded))
static const FbxAxisSystem	Motionbuilder
	Predefined axis system: Motionbuilder (UpVector = +Y, FrontVector = +Z, CoordSystem = +X (RightHanded))
static const FbxAxisSystem	OpenGL
	Predefined axis system: OpenGL (UpVector = +Y, FrontVector = +Z, CoordSystem = +X (RightHanded))
static const FbxAxisSystem	DirectX
	Predefined axis system: DirectX (UpVector = +Y, FrontVector = +Z, CoordSystem = -X (LeftHanded))
static const FbxAxisSystem	Lightwave
	Predefined axis system: Lightwave (UpVector = +Y, FrontVector = +Z, CoordSystem = -X (LeftHanded))

eXAxis	Search for all occurrences
eYAxis	Search for all occurrences
eZAxis	Search for all occurrences

eParityEven	Search for all occurrences
eParityOdd	Search for all occurrences

eRightHanded	Search for all occurrences
eLeftHanded	Search for all occurrences

eMayaZUp	UpVector = ZAxis, FrontVector = -ParityOdd, CoordSystem = RightHanded. Search for all occurrences
eMayaYUp	UpVector = YAxis, FrontVector = ParityOdd, CoordSystem = RightHanded. Search for all occurrences
eMax	UpVector = ZAxis, FrontVector = -ParityOdd, CoordSystem = RightHanded. Search for all occurrences
eMotionBuilder	UpVector = YAxis, FrontVector = ParityOdd, CoordSystem = RightHanded. Search for all occurrences
eOpenGL	UpVector = YAxis, FrontVector = ParityOdd, CoordSystem = RightHanded. Search for all occurrences
eDirectX	UpVector = YAxis, FrontVector = ParityOdd, CoordSystem = LeftHanded. Search for all occurrences
eLightwave	UpVector = YAxis, FrontVector = ParityOdd, CoordSystem = LeftHanded. Search for all occurrences

FbxAxisSystem	(	EUpVector	pUpVector,
		EFrontVector	pFrontVector,
		ECoordSystem	pCoorSystem
	)

pUpVector	Specify the up vector.
pFrontVector	Specify the front vector.
pCoorSystem	Specify RightHanded coordinate system or LeftHanded coordinate system.

void ConvertScene	(	FbxScene *	pScene,
		FbxNode *	pFbxRoot
	)		const

pScene	The scene to convert
pFbxRoot	The Fbx_Root node that will be transformed.

void ConvertChildren	(	FbxNode *	pRoot,
		const FbxAxisSystem &	pSrcSystem
	)		const

pRoot	The node whose children are converted.
pSrcSystem	The source axis system.

Class Description

Public Types

Public Member Functions

Constructor and Destructor

Boolean operation.

Predefined axis systems.

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation