Detailed Description

geometry filter function set

MFnGeometryFilter is the function set for geometry filters, the node that is the base class for deformers. Geometry filter nodes include clusters, ffds, nonlinears, user-defined deformers, sculpts, wires and blendShapes. The purpose of the geometry filter is to connect to the geometry that is deformed. The geometry filter is independent of any algorithm that calculates the deformation.

This function set provides methods for finding out which geometries are connected to geometry filter nodes.

#include <MFnGeometryFilter.h>

Inheritance diagram for MFnGeometryFilter:

[legend]

List of all members.

Public Member Functions
virtual MFn::Type	type () const
	Function set type.
virtual	~MFnGeometryFilter ()
	Destructor.
	MFnGeometryFilter ()
	Default constructor.
	MFnGeometryFilter (MObject &object, MStatus *ReturnStatus=NULL)
	Constructor.
MStatus	getInputGeometry (MObjectArray &objects) const
	This method returns the input geometry for the deformer by traversing the graph to find upstream shape nodes.
MStatus	getOutputGeometry (MObjectArray &objects) const
	The output geometry is packed into the provided list of MObjects.
MObject	inputShapeAtIndex (unsigned int index, MStatus *ReturnStatus=NULL) const
	Returns the input shape corresponding to the plug index.
MObject	outputShapeAtIndex (unsigned int index, MStatus *ReturnStatus=NULL) const
	Returns the output shape corresponding to the plug index.
unsigned int	indexForOutputShape (const MObject &shape, MStatus *ReturnStatus=NULL) const
	Returns the plug index for the specified output shape.
MStatus	getPathAtIndex (unsigned int index, MDagPath &path) const
	The DAG path of the output geometry at the specified plug index is put in the dagPath argument.
unsigned int	indexForGroupId (unsigned int groupId, MStatus *ReturnStatus=NULL) const
	Returns the plug index corresponding to the groupId.
unsigned int	groupIdAtIndex (unsigned int index, MStatus *ReturnStatus=NULL) const
	Returns the groupId at the specified plug index.
unsigned int	numOutputConnections (MStatus *ReturnStatus=NULL) const
	Returns the number of output geometries connected to this node.
unsigned int	indexForOutputConnection (unsigned int connectionIndex, MStatus *ReturnStatus=NULL) const
	Returns the plug index corresponding to the connection index.
MObject	deformerSet (MStatus *ReturnStatus=NULL) const
	Returns the set containing the objects that are deformed.
float	envelope (MStatus *ReturnStatus=NULL) const
	Returns the envelope value.
MStatus	setEnvelope (float envelope)
	Sets the envelope value.
	MFnGeometryFilter (const MObject &object, MStatus *ReturnStatus=NULL)
	Constructor.
Protected Member Functions
virtual const char *	className () const
	Class name. Search for all occurrences

Constructor & Destructor Documentation

MFnGeometryFilter	(	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

MFnGeometryFilter	(	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]

Search for all occurrences

Function set type.

Return the class type : MFn::kGeometryFilt.

Reimplemented from MFnDependencyNode.

Reimplemented in MFnSkinCluster, and MFnWeightGeometryFilter.

MStatus getInputGeometry ( MObjectArray & geomList ) const

Search for all occurrences

This method returns the input geometry for the deformer by traversing the graph to find upstream shape nodes.

It is possible for there to be nodes in between the shape and the deformer so that the returned shape may have a different topology or tweaks then the input data to the deformer. If the actual input geometry data for the deformer is required, this information can be accessed by using MPlug::getValue() to query the inputGeometry attribute on the deformer.

The input geometry is packed into the provided list of MObjects. Each of the MObjects will be a DAG node.

Parameters:

[out] geomList storage for the returned array

Returns:

MS::kSuccess operation successful
MS::kFailure function set does not have a valid object
MS::kInsufficientMemory out of memory

MStatus getOutputGeometry ( MObjectArray & geomList ) const

Search for all occurrences

The output geometry is packed into the provided list of MObjects.

Each of the MObjects will be a DAG node.

Parameters:

[out] geomList storage for the returned array

Returns:

MS::kSuccess operation successful
MS::kFailure function set does not have a valid object
MS::kInsufficientMemory out of memory

MObject inputShapeAtIndex	(	unsigned int	index,
		MStatus *	ReturnStatus = `NULL`
	)		const

Search for all occurrences

Returns the input shape corresponding to the plug index.

Parameters:

[in]	index	the plug index for the input shape
[out]	ReturnStatus	return status

Returns:: The input shape corresponding to the plug index

Status Codes:

MS::kSuccess operation successful
MS::kFailure operation failed

MObject outputShapeAtIndex	(	unsigned int	index,
		MStatus *	ReturnStatus = `NULL`
	)		const

Search for all occurrences

Returns the output shape corresponding to the plug index.

Parameters:

[in]	index	the plug index for the output shape
[out]	ReturnStatus	return status

Returns:: The output shape corresponding to the plug index

Status Codes:

MS::kSuccess operation successful
MS::kFailure operation failed

unsigned int indexForOutputShape	(	const MObject &	shape,
		MStatus *	ReturnStatus = `NULL`
	)		const

Search for all occurrences

Returns the plug index for the specified output shape.

Parameters:

[in]	shape	the shape for which the plug index is requested
[out]	ReturnStatus	return status

Returns:: The plug index leading to the specified shape

Status Codes:

MS::kSuccess operation successful
MS::kFailure operation failed
MS::kInvalidParameter shape parameter is invalid

MStatus getPathAtIndex	(	unsigned int	index,
		MDagPath &	dagPath
	)		const

Search for all occurrences

The DAG path of the output geometry at the specified plug index is put in the dagPath argument.

Parameters:

[in]	index	the plug index
[out]	dagPath	the DAG path whose index is requested

Returns:

MS::kSuccess operation successful
MS::kFailure function set does not have a valid object

unsigned int indexForGroupId	(	unsigned int	groupId,
		MStatus *	ReturnStatus = `NULL`
	)		const

Search for all occurrences

Returns the plug index corresponding to the groupId.

This ID can change from one Maya session to another, but it is unique for each Maya session.

Parameters:

[in]	groupId	the groupId for the plug index
[out]	ReturnStatus	return status

Returns:: The plug index corresponding to the groupId

Status Codes:

MS::kSuccess operation successful
MS::kFailure operation failed

unsigned int groupIdAtIndex	(	unsigned int	index,
		MStatus *	ReturnStatus = `NULL`
	)		const

Search for all occurrences

Returns the groupId at the specified plug index.

Parameters:

[in]	index	the plug index for which the groupId is requested
[out]	ReturnStatus	return status

Returns:: The groupId at the specified index

Status Codes:

MS::kSuccess operation successful
MS::kFailure operation failed

unsigned int numOutputConnections ( MStatus * ReturnStatus = NULL ) const

Search for all occurrences

Returns the number of output geometries connected to this node.

This is typically equal to the number of input geometries unless an input or output geometry has been deleted, or a connection to an input or output geometry has been broken.

This method is useful in conjunction with indexForOutputConnection to iterate through the affected objects.

For example:

    MFnGeometryFilter Fn(mObject);
    unsigned int numConnections = Fn.numOutputConnections();
    for (unsigned int i = 0; i < numConnections; i++) {
        unsigned int plugIndex = Fn.indexForOutputConnection(i);
        // perform an operation on that plugIndex
    }

Parameters:

[out] ReturnStatus return status

Returns:: The number of outputs

Status Codes:

MS::kSuccess operation successful
MS::kFailure function set does not have a valid object

unsigned int indexForOutputConnection	(	unsigned int	connectionIndex,
		MStatus *	ReturnStatus = `NULL`
	)		const

Search for all occurrences

Returns the plug index corresponding to the connection index.

The connection index is the index specifying the nth output connection. The plug index (logical index) is the sparse array index used by many of MFnGeometryFilter's methods and in MEL scripts. The connection index is 0-based, hence, the maximum value of the connection index is numOutputs - 1.

Parameters:

[in]	connectionIndex	the connection index
[out]	ReturnStatus	return status

Returns:: The plug index corresponding to the connection index

Status Codes:

MS::kSuccess operation successful
MS::kFailure operation failed

MObject deformerSet ( MStatus * ReturnStatus = NULL ) const

Search for all occurrences

Returns the set containing the objects that are deformed.

Adding new components to the deformer set will cause them to be deformed. Removing components from the deformer set will prevent them from being influenced by the deformer.

Note that the wrap deformer and the skinCluster deformers are special cases. They allow only a single object to be deformed per wrap/skinCluster, so adding additional geometries to a wrap or skinCluster node will have no effect.

Parameters:

[out] ReturnStatus return status

Returns:: The set containing the objects that are deformed

Status Codes:

MS::kSuccess operation successful
MS::kFailure operation failed

float envelope ( MStatus * ReturnStatus = NULL ) const

Search for all occurrences

Returns the envelope value.

The envelope is a global scale factor that is applied to all the values.

Parameters:

[out] ReturnStatus return status

Returns:: The envelope value

Status Codes:

MS::kSuccess operation successful
MS::kFailure operation failed

MStatus setEnvelope ( float envelope )

Search for all occurrences

Sets the envelope value.

The envelope is a global scale factor that is applied to all the values.

Parameters:

[in] envelope envelope value

Returns:

MS::kSuccess operation successful
MS::kFailure operation failed

MFnGeometryFilter Class Reference

OpenMayaAnim - API module for animation | FunctionSet classes

Detailed Description

Public Member Functions

Protected Member Functions

Constructor & Destructor Documentation

Member Function Documentation