Base class for component function sets. More...

#include <MFnComponent.h>

Inheritance diagram for MFnComponent:

Public Member Functions
virtual MFn::Type	type () const
	Function set type. More...

virtual	~MFnComponent ()
	Destructor.

	MFnComponent (MObject &object, MStatus *ReturnStatus=NULL)
	Constructor. More...

	MFnComponent ()
	Default class constructor.

int	elementCount (MStatus *ReturnStatus=NULL) const
	Returns the number of elements that this component contains. More...

MFn::Type	componentType (MStatus *ReturnStatus=NULL) const
	Returns the MFn type of the component. More...

bool	isEmpty (MStatus *ReturnStatus=NULL) const
	Determines if this component is empty, i.e. More...

bool	isEqual (MObject &, MStatus *ReturnStatus=NULL) const
	Compares this component with the given component. More...

bool	isComplete (MStatus *ReturnStatus=NULL) const
	Returns the complete state of the component. More...

MStatus	setComplete (bool)
	Sets the complete state of the component. More...

bool	hasWeights () const
	Query this component for the existance of attached weight data. More...

MWeight	weight (int index, MStatus *ReturnStatus=NULL) const
	Return the weight data for a given element within this component. More...

MStatus	setWeight (int index, const MWeight &weight)
	Set the weight data for a given element within this component. More...

MStatus	setWeights (const MWeight &weight)
	Set the weight data for all elements within this component. More...

	MFnComponent (const MObject &object, MStatus *ReturnStatus=NULL)
	Constructor. More...

MFn::Type	type (MStatus *ReturnStatus=NULL)
	Deprecated in 2019.0 More...

Public Member Functions inherited from MFnBase
virtual	~MFnBase ()
	Class Destructor. More...

bool	hasObj (MFn::Type) const
	Determines whether or not the Function Set is compatible with the specified Maya Object within the API RTTI system. More...

bool	hasObj (const MObject &) const
	Determines whether or not the Function Set is compatible with the specified Maya Object within the API RTTI system. More...

MObject	object (MStatus *ReturnStatus=nullptr) const
	Returns the MObject that is attached to the Function Set. More...

virtual MStatus	setObject (MObject &object)
	Attaches the Function Set to the specified Maya Object. More...

virtual MStatus	setObject (const MObject &object)
	NO SCRIPT SUPPORT. More...

Static Public Member Functions
static const char *	className ()
	Returns the name of this class. More...

Static Public Member Functions inherited from MFnBase
static const char *	className ()
	Returns the name of this class. More...

static const char *	typeString (MFn::Type)
	Introduced in 2020.0 More...

static bool	isValid (MFn::Type)
	Introduced in 2020.0 More...

Detailed Description

Base class for component function sets.

This is the base class for all function sets which deal with component objects.

Components are MObjects which hold index information for shapes. The component object does not contain any information about the shape, it just contains index values and type information.

Components can be marked as complete meaning that the component represents a complete set of indices from 0 to numElements-1;

Components come is 3 varieties based upon the dimensions of the index. The types are single, double, and triple indexed. Examples of these types are mesh vertices (single indexed), nurbs surface CVs (double indexed), and lattice points (triple indexed).

To create, edit, or query a specific type of component, use the derived classes MFnSingleIndexedComponent, MFnDoubleIndexedComponent, and MFnTripleIndexedComponent.

Examples:: componentScaleManip/componentScaleManip.cpp, and listRichSelectionCmd/listRichSelectionCmd.cpp.

Constructor & Destructor Documentation

MFnComponent	(	MObject &	object,
		MStatus *	ReturnStatus = `NULL`
	)

Constructor.

Class constructor that initializes the function set to the given MObject.

Parameters

[in]	object	The MObject to attach the function set to
[out]	ReturnStatus	the return status

Status Codes:

MS::kSuccess if the function set is successfully attached
MS::kInvalidParameter if the MObject does not represent a valid Maya object or if the function set is not allowed to attach to this MObject

MFnComponent	(	const MObject &	object,
		MStatus *	ReturnStatus = `NULL`
	)

Constructor.

Class constructor that initializes the function set to the given MObject.

Parameters

[in]	object	The MObject to attach the function set to
[out]	ReturnStatus	the return status

Status Codes:

MS::kSuccess if the function set is successfully attached
MS::kInvalidParameter if the MObject does not represent a valid Maya object or if the function set is not allowed to attach to this MObject

Member Function Documentation

MFn::Type type ( ) const

virtual

Function set type.

Return the class type : MFn::kComponent.

Returns: the class type.

Reimplemented from MFnBase.

Reimplemented in MFnDoubleIndexedComponent, MFnSingleIndexedComponent, MFnTripleIndexedComponent, and MFnUint64SingleIndexedComponent.

OPENMAYA_MAJOR_NAMESPACE_OPEN const char * className ( )

static

Returns the name of this class.

Return the class name : "MFnComponent".

Returns: Name of this class.

int elementCount ( MStatus * ReturnStatus = NULL ) const

Returns the number of elements that this component contains.

Parameters

[out] ReturnStatus Status code

Returns: The number of elements

Status Codes:

MS::kSuccess The operation succeeded
MS::kFailure Object error

Examples:: apiMeshShape/apiMeshShape.cpp, and paintCallback/paintCallback.cpp.

MFn::Type componentType ( MStatus * ReturnStatus = NULL ) const

Returns the MFn type of the component.

Parameters

[out] ReturnStatus Status code

Returns: The type

Status Codes:

MS::kSuccess The operation succeeded
MS::kFailure Object error

Examples:: apiMeshShape/apiMeshSubSceneOverride.cpp.

bool isEmpty ( MStatus * ReturnStatus = NULL ) const

Determines if this component is empty, i.e.

there are no index elements.

Parameters

[out] ReturnStatus Status code

Returns: True if empty, false otherwise

Status Codes:

MS::kSuccess The operation succeeded
MS::kFailure Object error

bool isEqual	(	MObject &	component,
		MStatus *	ReturnStatus = `NULL`
	)		const

Compares this component with the given component.

Parameters

[in]	component	component to compare
[out]	ReturnStatus	Status code

Returns: True if the components are equal, false otherwise

Status Codes:

MS::kSuccess The operation succeeded
MS::kFailure Object error

bool isComplete ( MStatus * ReturnStatus = NULL ) const

Returns the complete state of the component.

Components can be marked as complete meaning that the component represents a complete set of indices from 0 to numElements-1;

Parameters

[out] ReturnStatus Status code

Returns: True if this component is complete, false otherwise

Status Codes:

MS::kSuccess The operation succeeded
MS::kFailure Object error

MStatus setComplete ( bool complete )

Sets the complete state of the component.

Components can be marked as complete meaning that the component represents a complete set of indices from 0 to numElements-1;

Important: if the component is set as complete, setCompleteData must also be called with the appropriate parameter (the total number of elements in the object). Note that setCompleteData(...) also sets the component as complete, thus 'setComplete(true)' may never need to appear in your code.

setCompleteData(...) is defined in derived classes.

Parameters

[in] complete true sets the component as complete

Returns: Status code

Status Codes:

MS::kSuccess The operation succeeded
MS::kFailure Object error

bool hasWeights ( ) const

Query this component for the existance of attached weight data.

Weight data will be added to a component as part of soft selection and/or symmetry. Note that this method does not test for the existance of external weight information (e.g. deformer weights stored in separate attributes).

Returns: True if the component includes weight data, false otherwise

Examples:: apiMeshShape/apiMeshShape.cpp.

MWeight weight	(	int	index,
		MStatus *	ReturnStatus = `NULL`
	)		const

Return the weight data for a given element within this component.

Note that this method does not return external weight data (e.g. deformer weights stored in separate attributes).

Parameters

[in]	index	The element to return weight data for (note that this is the linear index between 0 and elementCount()-1)
[out]	ReturnStatus	Status code

Returns: The element weight data.

Status Codes:

MS::kSuccess The operation succeeded
MS::kFailure Object error

Examples:: apiMeshShape/apiMeshShape.cpp.

MStatus setWeight	(	int	index,
		const MWeight &	weight
	)

Set the weight data for a given element within this component.

Parameters

[in]	index	The element to set weight data for (note that this is the linear index between 0 and elementCount()-1)
[in]	weight	The new weight for the element

Returns: Status code

Status Codes:

MS::kSuccess The operation succeeded
MS::kInvalidParameter index out of range
MS::kFailure Object error

MStatus setWeights ( const MWeight & weight )

Set the weight data for all elements within this component.

Parameters

[in] weight The new weight for all element

Returns: Status code

Status Codes:

MS::kSuccess The operation succeeded
MS::kFailure Object error

MFn::Type type ( MStatus * ReturnStatus = NULL )

Deprecated in 2019.0

Not available in Python.

Deprecated:: Use the MFnComponent::componentType method instead.

2019.0:: Deprecated in this version.

Parameters

[out] ReturnStatus Return status.

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

MFnComponent.h
MFnComponent.cpp

Public Member Functions

Static Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation