MPxConstraint Class Reference
[OpenMayaAnim - API module for animation, Proxy classes]

#include <MPxConstraint.h>
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List of all members.

Detailed Description

Proxy constraint node.

MPxConstraint is the parent class for user defined constraint nodes. Position, orientation or scale of an object can be constrained by other objects. This class works in conjunction with the MPxConstraintCommand class.

Examples:

geometrySurfaceConstraint.cpp, and geometrySurfaceConstraint.h.


Public Types
enum   UpVectorType {
   kScene = 0, kObject, kObjectRotation, kVector,
   kLast
}
  The type of up vector. More...

Public Member Functions
  MPxConstraint ()
virtual  ~MPxConstraint ()
virtual const MObject  weightAttribute () const
virtual const MObject  targetAttribute () const
virtual const MObject  constraintRotateOrderAttribute () const

Static Public Attributes
static MObject  enableRestPosition

Protected Member Functions
virtual const MObject  passiveOutputAttribute () const
virtual void  getOutputAttributes (MObjectArray &attributeArray)
MStatus  closestPoint (const MObject &dataGeometryObject, const MPoint &toThisPoint, MPoint &theClosestPoint) const
MStatus  closestNormal (const MObject &dataGeometryObject, const MPoint &toThisPoint, MVector &theNormal) const
MStatus  closestTangent (const MObject &dataGeometryObject, const MPoint &toThisPoint, MVector &theTangent) const
MEulerRotation  computeAim (const MMatrix &parentInverseMatrix, const MVector &targetVector, const MVector &aimVector, const MVector &upVector, const MVector &wupVector, MEulerRotation::RotationOrder order=MEulerRotation::kXYZ, const MQuaternion &jointOrient=MQuaternion::identity, MStatus *ResultStatus=NULL) const
MVector  worldUpVector (MPxConstraint::UpVectorType upType, const MVector &upVector, const MMatrix &upMatrix, const MPoint &constrPoint, MStatus *ResultStatus=NULL) const
MPoint  worldConstraintPoint (const MMatrix &parentInverseMatrix, const MVector &translate, const MVector &rotatePivot, const MVector &rotatePivotTranslate, MStatus *ResultStatus=NULL) const

Member Enumeration Documentation

enum MPxConstraint::UpVectorType

The type of up vector.

Enumerator:
kScene  Scene up vector.
kObject  Object up vector.
kObjectRotation  Object rotation up vector.
kVector  Specified vector.
kLast  Last value, used for counting.

Constructor & Destructor Documentation

MPxConstraint::MPxConstraint (  ) 

Constructor.

The constructor should never call any methods from MPxConstraint or make any calls that require the existence of the MObject associated with the user defined node. The postConstructor method should be used to do any initialization of this kind.

MPxConstraint::~MPxConstraint (  )  [virtual]

Destructor.

Member Function Documentation

const MObject MPxConstraint::weightAttribute (  )  const [virtual]

Returns the weight attribute for the constraint. Default implementation returns MObject::kNullObj.

Examples:
geometrySurfaceConstraint.h.

const MObject MPxConstraint::targetAttribute (  )  const [virtual]

Returns the target attribute for the constraint. Default implementation returns MObject::kNullObj.

Examples:
geometrySurfaceConstraint.h.

const MObject MPxConstraint::constraintRotateOrderAttribute (  )  const [virtual]

Returns the rotate order attribute for the constraint. Default implementation returns MObject::kNullObj.

If is only necessary to override this method if the constraint will control rotation.

const MObject MPxConstraint::passiveOutputAttribute (  )  const [protected, virtual]

Returns the passive output attribute for the constraint. Default implementation returns MObject::kNullObj.

Passive output attributes do not prevent value modifications to the destination attribute when connected.

void MPxConstraint::getOutputAttributes ( MObjectArray &  attributeArray  )  [protected, virtual]

Returns output attributes for the constraint. Default implementation clears the input attributeArray and returns.

Examples:
geometrySurfaceConstraint.h.

MStatus MPxConstraint::closestPoint ( const MObject &  dataGeometryObject,
const MPoint &  toThisPoint,
MPoint &  theClosestPoint  
) const [protected]

Returns the closest point on this surface to the given point.

Parameters:
[in]  dataGeometryObject  surface
[in]  toThisPoint  the point to evaluate from
[out]  theClosestPoint  the calculated closest point
Returns:
Status code
Status Codes:

MStatus MPxConstraint::closestNormal ( const MObject &  dataGeometryObject,
const MPoint &  toThisPoint,
MVector &  theNormal  
) const [protected]

Returns the closest normal on this surface to the given point.

Parameters:
[in]  dataGeometryObject  surface
[in]  toThisPoint  the point to evaluate from
[out]  theNormal  the calculated closest normal
Returns:
Status code
Status Codes:

MStatus MPxConstraint::closestTangent ( const MObject &  dataGeometryObject,
const MPoint &  toThisPoint,
MVector &  theTangent  
) const [protected]

Returns the closest tangent on this surface to the given point.

Parameters:
[in]  dataGeometryObject  surface
[in]  toThisPoint  the point to evaluate from
[out]  theTangent  the calculated closest tangent
Returns:
Status code
Status Codes:

MEulerRotation MPxConstraint::computeAim ( const MMatrix &  parentInverseMatrix,
const MVector &  targetVector,
const MVector &  aimVector,
const MVector &  upVector,
const MVector &  wUpVector,
MEulerRotation::RotationOrder  order = MEulerRotation::kXYZ,
const MQuaternion &  jointOrient = MQuaternion::identity,
MStatus *  ResultStatus = NULL  
) const [protected]

Returns the rotation which aligns the aimVector in local space with the targetVector in local space while keeping the upVector in local space and the wUpVector world space aligned as closely as possible.

Parameters:
[in]  parentInverseMatrix 
[in]  targetVector 
[in]  aimVector 
[in]  upVector 
[in]  wUpVector 
[in]  order 
[in]  jointOrient 
[out]  ResultStatus 
Returns:
Aim rotation.
Status Codes:

MVector MPxConstraint::worldUpVector ( MPxConstraint::UpVectorType  upType,
const MVector &  upVector,
const MMatrix &  upMatrix,
const MPoint &  constrPoint,
MStatus *  ResultStatus = NULL  
) const [protected]

Returns the world up vector based on the requested up type.

Parameters:
[in]  upType 
[in]  upVector 
[in]  upMatrix 
[in]  constrPoint 
[out]  ResultStatus 
Returns:
World up vector.
Status Codes:

MPoint MPxConstraint::worldConstraintPoint ( const MMatrix &  parentInverseMatrix,
const MVector &  translate,
const MVector &  rotatePivot,
const MVector &  rotatePivotTranslate,
MStatus *  ResultStatus = NULL  
) const [protected]

Returns the world constraint point.

Parameters:
[in]  parentInverseMatrix 
[in]  translate 
[in]  rotatePivot 
[in]  rotatePivotTranslate 
[out]  ResultStatus 
Returns:
World constraint point.
Status Codes:

Member Data Documentation

MObject MPxConstraint::enableRestPosition [static]

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