This reference page is linked to from the following overview topics: Geometry data.

Detailed Description

Base Class for User-defined Dependency Graph Geometry Data Types.

This class is used to provide a wrapper or container for some arbitrary geometry type that you have defined. This allows your data type to exist as typed attributes on dependency nodes and to be passed through dependency graph connections.

MP`xGeometryData is similar to MPxData but includes methods to support sets (also known as groups) and component iteration.

For user defined shapes (MPxSurfaceShape derived classes), in order to support maya's deformers you must declare an MPxGeometryData class as well as a geometry iterator (MPxGeometryIterator).

To register geometry data use MFnPlugin::registerData with the type argument equal to MPxData::kGeometryData.

Examples:: apiMeshData.h.

#include <MPxGeometryData.h>

Inheritance diagram for MPxGeometryData:

[legend]

List of all members.

Public Member Functions
	MPxGeometryData ()
	Class Constructor.
virtual	~MPxGeometryData ()
	Class Destructor.
virtual MPxGeometryIterator *	iterator (MObjectArray &componentList, MObject &component, bool useComponents)
	Associates a control point based geometry iterator with this data.
virtual MPxGeometryIterator *	iterator (MObjectArray &componentList, MObject &component, bool useComponents, bool world) const
	Associates a control point based geometry iterator with this data.
virtual bool	updateCompleteVertexGroup (MObject &component) const
	This method is used in conjunction with MPxSurfaceShape classes which support maya's deformations.
virtual bool	deleteComponent (const MObjectArray &compList)
	This method should be overridden if this data is to support component deletion.
virtual bool	deleteComponentsFromGroups (const MObjectArray &compList, MIntArray &groupIdArray, MObjectArray &groupComponentArray)
	This method should be overridden to modify the groups that flows along with the geometry, as part of the data, based on the components being deleted.
virtual void	smartCopy (const MPxGeometryData *srcGeom)
	This method is used in conjunction with MPxSurfaceShape classes which support maya's deformations.
virtual void	copy (const MPxData &src)=0
	This method initializes an instance of an MPxGeometryData derived class from another existing instance.
virtual MTypeId	typeId () const =0
	Determines the type id of the Data object.
virtual MString	name () const =0
	Determines the type name of the Data object.
void	setMatrix (const MMatrix &)
	Store the matrix associated to MPxGeometryData.
const MMatrix &	matrix () const
	Return the matrix associated to MPxGeometryData.
bool	matrix (MMatrix &) const
	Return the matrix associated to MPxGeometryData.

Member Function Documentation

MPxGeometryIterator * iterator	(	MObjectArray &	componentList,
		MObject &	component,
		bool	useComponents
	)		`[virtual]`

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Associates a control point based geometry iterator with this data.

This method is used in conjunction with MPxSurfaceShape and should be overridden if your shape is to support maya's deformations.

The useComponents argument specifies whether the iteration is over the given componentList or the component.

Parameters:

[in]	componentList	a list of components that are to be iterated over
[in]	component	a component to be iterator over
[in]	useComponents	if true then componentList is to be iterated over, otherwise the iteration is on component.

Returns:: A pointer to an iterator for your geometry

Examples:: apiMeshData.h.

MPxGeometryIterator * iterator	(	MObjectArray &	componentList,
		MObject &	component,
		bool	useComponents,
		bool	world
	)		const `[virtual]`

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Associates a control point based geometry iterator with this data.

This method is used in conjunction with MPxSurfaceShape and should be overridden if your shape is to support maya's deformations.

The useComponents argument specifies whether the iteration is over the given componentList or the component.

This iterator method is called when the iteration is for read only purposes.

Parameters:

[in]	componentList	a list of components that are to be iterated over
[in]	component	a component to be iterator over
[in]	useComponents	if true then componentList is to be iterated over, otherwise the iteration is on component.
[in]	world	specifies whether the iteration is for world space data

Returns:: A pointer to an iterator for your geometry

bool updateCompleteVertexGroup ( MObject & component ) const [virtual]

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This method is used in conjunction with MPxSurfaceShape classes which support maya's deformations.

This method should make sure that complete vertex group data is up-to-date. If the given component is not complete (i.e. it represents all elements of your geometry) then you must mark is as complete using the methods of MFnComponent and return true if the component was updated, false if it was already complete.

This method is used by deformers when deforming the "whole" object and not just selected components.

Parameters:

[in] component the component to test

Returns:: Returns true if the component was updated, false if it was already complete

Examples:: apiMeshData.h.

bool deleteComponent ( const MObjectArray & compList ) [virtual]

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This method should be overridden if this data is to support component deletion.

For user defined shapes (MPxSurfaceShape) which support components, this method must be overridden if component deletion is to be supported when the shape has history.

Parameters:

[in] compList a list of components that are to be deleted

Returns:: true if the deletion was successfull, false otherwise

bool deleteComponentsFromGroups	(	const MObjectArray &	compList,
		MIntArray &	groupIdArray,
		MObjectArray &	groupComponentArray
	)		`[virtual]`

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This method should be overridden to modify the groups that flows along with the geometry, as part of the data, based on the components being deleted.

It should intelligently update the groups based on what gets deleted. The class MFnGeometryData can be used to access and modify grouping information for data.

The groupIdArray and groupComponentArray should contain the updated grouping information after the deletion has occurred.

Parameters:

[in]	compList	a list of components that are to be deleted
[in]	groupIdArray	array of group id's
[in]	groupComponentArray	array of updated components, one for each group id

Returns:: true if the deletion was successfull, false otherwise

void smartCopy ( const MPxGeometryData * srcGeom ) [virtual]

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This method is used in conjunction with MPxSurfaceShape classes which support maya's deformations.

This method is used to prvoide maya with an efficient way to copy the source data into the memory of this data with as little memory allocation as possible.

This method is not mandatory and only needs to be overridden to improve performance of deformations on shapes.

Parameters:

[in] srcGeom a pointer to the data to be copied

void copy ( const MPxData & src ) [pure virtual]

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This method initializes an instance of an MPxGeometryData derived class from another existing instance.

This method can be thought of as the second half of a copy constructor for the class. The default constructor has already been called for the instance, and this method is used to set the private data by copying the values from an existing instance. This is a pure virtual method, and must be overridden in derived classes.

Parameters:

[in] src The object from which to copy the private data

Implements MPxData.