#include <MFnBlendShapeDeformer.h>

Class Description

blend shape deformer function set

MFnBlendShapeDeformer is the function set for blend shape deformers. A blend shape deformer takes a base shape (polygonal surface, curve, surface, or lattice) and blends it with other target shapes based on weight values.

The blend shape deformer is actually a small network of dependency nodes in the dependency graph. This function set is provided to make manipulation of the network easier. The main deformer node should be given to this function set as its object.

There are three parts to a blend shape deformer. There are the base objects, the target objects, and the weight values.

The base objects are the shapes that are to be deformed. There must be at least one base object. The base objects will change form as the targets and deformation parameters are modified.

Each base object has a list of target objects that affect its shape. Each target is associated with one of the the deformer's weight values. When the weight value increases, the target has more influence on the base shape.

There is just one array of weight values between all of the base objects and targets. So, it is possible for targets of different base objects to share the same weight index. When the weight value changes, it will affect all of the base objects that have targets using that weight value.

It is also possible to chain together target shapes so that a base object will deform through each shape one at a time as the weight value increases. This is done by adding multiple targets to a base shape using the same weight index for all of them. When each target is added, a weight value is specified at which that target will be in full effect. Give each target a different full weight value.

For example, one could take a sphere and make it blend into a cone and then into a cylinder. One way to do this is to make sphere the base shape. Then, add the cone as a target for the sphere at weight index 0 with a full effect weight of 0.5. Next, add the cylinder as a second target for the sphere also at weight index 0, but with a full effect weight of 1.0. Now, as the weight goes from 0 to 1, the base shape will start as a sphere, morph into a cone, and then into a cylinder.

It is not necessary for the base shape and its targets to have identical vertex/CV counts, but the blend will be more effective if they do.

Inheritance diagram for MFnBlendShapeDeformer:

Public Types
enum	Origin { kLocalOrigin, kWorldOrigin }
	Specifies the space to use for the deformation origin. More...

enum	HistoryLocation { kFrontOfChain, kNormal, kPost, kOther }
	Specifies where in the shape's history to place the deformer (deformation order). More...

enum	TargetType { kObject, kTangent }
	TODO. More...

Public Types inherited from MFnDependencyNode
enum	MAttrClass { kLocalDynamicAttr = 1, kNormalAttr, kExtensionAttr, kInvalidAttr }
	Specifies the scope of the attribute. More...

enum	MdgTimerState { kTimerOff, kTimerOn, kTimerUninitialized, kTimerInvalidState }
	Possible states for the node's timer. More...

enum	MdgTimerMetric { kTimerMetric_callback, kTimerMetric_compute, kTimerMetric_dirty, kTimerMetric_draw, kTimerMetric_fetch, kTimerMetric_callbackViaAPI, kTimerMetric_callbackNotViaAPI, kTimerMetric_computeDuringCallback, kTimerMetric_computeNotDuringCallback, kTimerMetrics }
	The different timer metrics which can be queried. More...

enum	MdgTimerType { kTimerType_self, kTimerType_inclusive, kTimerType_count, kTimerTypes }
	The types of timers which can be queried. More...

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

virtual	~MFnBlendShapeDeformer ()
	Destructor.

	MFnBlendShapeDeformer ()
	Default constructor.

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

MObject	create (MObject baseObject, Origin originSpace=kLocalOrigin, MStatus *ReturnStatus=NULL)
	Creates a new blend shape deformer in the dependency graph with the specified shape as the baseObject. More...

MObject	create (const MObjectArray &baseObjects, Origin originSpace=kLocalOrigin, HistoryLocation=kNormal, MStatus *ReturnStatus=NULL)
	Creates a new blend shape deformer in the dependency graph. More...

MStatus	addBaseObject (MObject &object)
	Adds a new base object to the deformer. More...

MStatus	getBaseObjects (MObjectArray &objects) const
	Get a list of all of the base objects for this deformer. More...

MStatus	addTarget (const MObject &baseObject, int weightIndex, const MObject &newTarget, double fullWeight, TargetType targetType=kObject)
	Adds a new target object for the given base object. More...

MStatus	addTarget (const MObject &baseObject, int weightIndex, double fullWeight, TargetType targetType=kObject)
	Adds a new delta target object for the given base object. More...

MStatus	removeTarget (const MObject &baseObject, int weightIndex, const MObject &target, double fullWeight)
	Remove a target object for the given base object. More...

MStatus	getTargets (MObject baseObject, int weightIndex, MObjectArray &targetObjects) const
	Get a list of all of the target objects for the given base object that affect it based on the given weight index. More...

unsigned int	numWeights (MStatus *ReturnStatus=NULL) const
	Return the number of weight values that this blend shape deformer has. More...

MStatus	weightIndexList (MIntArray &indexList) const
	Return the array index numbers corresponding to the targets. More...

MStatus	targetItemIndexList (unsigned int weightIndex, MObject baseObject, MIntArray &targetItemIndices) const
	A base object may have more than one target using the same element of the blendShape's 'weights' array. More...

float	weight (unsigned int index, MStatus *ReturnStatus=NULL) const
	Get the weight value at the given index. More...

MStatus	setWeight (unsigned int index, float weight)
	Set the weight value at the given index. More...

float	envelope (MStatus *ReturnStatus=NULL) const
	Gets the envelope value of the deformer. More...

MStatus	setEnvelope (float envelope)
	Sets the envelope value of the deformer. More...

Origin	origin (MStatus *ReturnStatus=NULL) const
	Gets the origin space. More...

MStatus	setOrigin (Origin space)
	Sets the origin space. More...

HistoryLocation	historyLocation (MStatus *ReturnStatus=NULL) const
	Gets the history location (deformation order). More...

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

Public Member Functions inherited from MFnDependencyNode
virtual	~MFnDependencyNode ()
	Destructor.

	MFnDependencyNode ()
	Default constructor.

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

MObject	create (const MTypeId &typeId, MStatus *ReturnStatus=NULL)
	Creates a new dependency node with the given type tag. More...

MObject	create (const MTypeId &typeId, const MString &name, MStatus *ReturnStatus=NULL)
	Creates a new dependency node with the given type tag. More...

MObject	create (const MString &type, MStatus *ReturnStatus=NULL)
	Creates a new dependency node with the given type. More...

MObject	create (const MString &type, const MString &name, MStatus *ReturnStatus=NULL)
	Creates a new dependency node with the given type. More...

MTypeId	typeId (MStatus *ReturnStatus=NULL) const
	Returns the type id of this node. More...

MString	typeName (MStatus *ReturnStatus=NULL) const
	Returns the type name of this node. More...

MString	name (MStatus *ReturnStatus=NULL) const
	Returns the name of this node. More...

MString	absoluteName (MStatus *ReturnStatus=NULL) const
	Returns the absolute name of this node. More...

MString	pluginName (MStatus *ReturnStatus=NULL) const
	Returns the name of the plug-in this MFnDependendencyNode was defined in. More...

MString	setName (const MString &name, bool createNamespace=false, MStatus *ReturnStatus=NULL)
	Sets the name of this node. More...

MUuid	uuid (MStatus *ReturnStatus=NULL) const
	Returns the node's UUID. More...

void	setUuid (const MUuid &uuid, MStatus *ReturnStatus=NULL)
	Sets the node's UUID. More...

MStatus	getConnections (MPlugArray &array) const
	Get all of the current connections to this node as an array of plugs. More...

unsigned int	attributeCount (MStatus *ReturnStatus=NULL) const
	Returns the number of attributes that this node has. More...

MObject	attribute (unsigned int index, MStatus *ReturnStatus=NULL) const
	Finds the attribute of this node at the given index. More...

MObject	reorderedAttribute (unsigned int index, MStatus *ReturnStatus=NULL) const
	Some nodes, such as the various animCurve nodes, require that their attributes be set in a specific order for proper operation. More...

MObject	attribute (const MString &attrName, MStatus *ReturnStatus=NULL) const
	Finds the attribute of this node that has the given name. More...

MAttrClass	attributeClass (const MObject &attr, MStatus *ReturnStatus=NULL) const
	Returns the class (normal, dynamic, extension) of the specified attribute. More...

MStatus	getAffectedAttributes (const MObject &attr, MObjectArray &affectedAttributes) const
	Returns an array of attributes that are affected by the attribute passed in. More...

MStatus	getAffectedByAttributes (const MObject &attr, MObjectArray &affectedByAttributes) const
	Returns an array of attributes that affect the attribute passed in, attr. More...

MPlug	findPlug (const MObject &attr, bool wantNetworkedPlug, MStatus *ReturnStatus=NULL) const
	Attempt to find a plug for the given attribute. More...

MPlug	findPlug (const MString &attrName, bool wantNetworkedPlug, MStatus *ReturnStatus=NULL) const
	Attempt to find a plug for the given attribute. More...

MPlug	findPlug (const MObject &attr, MStatus *ReturnStatus=NULL) const
	This method is obsolete. More...

MPlug	findPlug (const MString &attrName, MStatus *ReturnStatus=NULL) const
	This method is obsolete. More...

MStatus	addAttribute (const MObject &attr)
	Add a new dynamic attibute to this node. More...

MStatus	removeAttribute (const MObject &attr)
	Remove a dynamic attribute from a node. More...

MPxNode *	userNode (MStatus *ReturnStatus=NULL) const
	If the function set's node is a plug-in node, then this method will extract the MPxNode pointer from it. More...

bool	isFromReferencedFile (MStatus *ReturnStatus=NULL) const
	Indicates whether or not this node came from a referenced file. More...

bool	isShared (MStatus *ReturnStatus=NULL) const
	Indicates whether or not this node is shared. More...

bool	isTrackingEdits (MStatus *ReturnStatus=NULL) const
	Returns whether or not edits on the given node are being tracked by the generalized edit system. More...

bool	hasUniqueName (MStatus *ReturnStatus=NULL) const
	Indicates whether or not this node's name is unique within the scene. More...

MString	parentNamespace (MStatus *ReturnStatus=NULL) const
	Returns the name of the namespace in which this node resides. More...

bool	isLocked (MStatus *ReturnStatus=NULL) const
	Indicates whether or not this node is locked. More...

MStatus	setLocked (bool locked)
	Locks or unlocks this node. More...

bool	isNewAttribute (const MObject &attr, MStatus *ReturnStatus=NULL) const
	Indicates whether or not the specified attribute was added to this node within the current scene. More...

MStatus	setFlag (unsigned int flag, bool state)
	Sets the state of the specified flag for the node. More...

bool	isFlagSet (unsigned int flag, MStatus *ReturnStatus=NULL) const
	Retrieves the current state of the specified flag for a node. More...

bool	isDefaultNode (MStatus *ReturnStatus=NULL) const
	Returns true if the node is a default node. More...

MStatus	setDoNotWrite (bool flag)
	Use this method to mark the "do not write" state of this node. More...

bool	canBeWritten (MStatus *ReturnStatus=NULL) const
	Returns the do not write state of the node. More...

bool	hasAttribute (const MString &name, MStatus *ReturnStatus=NULL) const
	Returns true if the node already has an attribute with the given name. More...

MObject	getAliasAttr (bool force, MStatus *ReturnStatus=NULL)
	Returns the node's alias attribute, which is a special attribute used to store information about the node's attribute aliases. More...

bool	setAlias (const MString &alias, const MString &name, const MPlug &plug, bool add=true, MStatus *ReturnStatus=NULL)
	Sets or removes an alias (i.e. More...

bool	findAlias (const MString &alias, MObject &attrObj, MStatus *ReturnStatus=NULL) const
	Retrieves the attribute with the given alias. More...

bool	getAliasList (MStringArray &strArray, MStatus *ReturnStatus=NULL)
	Returns a list of all attribute aliases for this node. More...

MString	plugsAlias (const MPlug &plug, MStatus *ReturnStatus=NULL)
	Returns the alias for the plug's attribute or the empty string if that attribute has no alias. More...

MStatus	setIcon (const MString &filename)
	Associates a custom icon with the node for display in the Maya UI. More...

MString	icon (MStatus *ReturnStatus=NULL) const
	Returns the custom icon filename associated with the node. More...

MStatus	getExternalContent (MExternalContentInfoTable &table) const
	Returns the external content (files) that this node depends on. More...

MStatus	addExternalContentForFileAttr (MExternalContentInfoTable &table, const MObject &attr) const
	Adds content info to the specified table from a file path attribute. More...

MStatus	setExternalContentForFileAttr (const MObject &attr, const MExternalContentLocationTable &table)
	Sets content info in the specified attribute from the table. More...

MStatus	setExternalContent (const MExternalContentLocationTable &table)
	Changes the location of external content. More...

MString	setName (const MString &name, MStatus *ReturnStatus)
	OBSOLETE FUNCTION, NO SCRIPT SUPPORT. More...

	MFnDependencyNode (const MObject &object, MStatus *ReturnStatus=NULL)
	NO SCRIPT SUPPORT. More...

bool	getPlugsAlias (const MPlug &plug, MString &aliasName, MStatus *ReturnStatus=NULL)
	NO SCRIPT SUPPORT. More...

virtual const adsk::Data::Associations *	metadata (MStatus *ReturnStatus=NULL) const
	This method is not available in Python. More...

virtual MStatus	setMetadata (const adsk::Data::Associations &)
	This method is not available in Python. More...

virtual MStatus	deleteMetadata ()
	This method is not available in Python. More...

virtual MStatus	validateMetadata (MString &errors) const
	This method is not available in Python. More...

MStatus	dgTimerOn ()
	Indicates that this node should collect DG timing data whenever DG timing is enabled. More...

MStatus	dgTimerOff ()
	Indicates that this node should no longer collect DG timing data when DG timing is enabled. More...

MdgTimerState	dgTimerQueryState (MStatus *ReturnStatus=NULL)
	The function returns the current on/off state of the node's timer. More...

MStatus	dgTimerReset ()
	The function resets the dependency graph timers and counters for this node to zero. More...

double	dgTimer (const MdgTimerMetric timerMetric, const MdgTimerType timerType, MStatus *ReturnStatus=NULL) const
	The function returns the specified timer value for the current node. More...

MStatus	dgCallbacks (const MdgTimerType type, MStringArray &callbackName, MDoubleArray &value)
	Node callbacks that occur when timing is enabled get logged with the node and can be queried via this method. More...

MStatus	dgCallbackIds (const MdgTimerType type, const MString &callbackName, MCallbackIdArray &callbackId, MDoubleArray &value)
	This method provides a further breakdown of the per-callback time returned via dgCallbacks() by returning the data on a per-callbackId basis. More...

MStatus	addAttribute (const MObject &attr, MAttrClass type)
	This method is obsolete. More...

MStatus	removeAttribute (const MObject &attr, MAttrClass type)
	This method is obsolete. 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=NULL) 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...

Protected Member Functions
virtual const char *	className () const
	Class name.

Additional Inherited Members
Static Public Member Functions inherited from MFnDependencyNode
static MString	classification (const MString &nodeTypeName)
	Retrieves the classification string for a node type. More...

static unsigned int	allocateFlag (const MString pluginName, MStatus *ReturnStatus=NULL)
	Allocates a node flag for sole use by the caller. More...

static MStatus	deallocateFlag (const MString pluginName, unsigned int flag)
	Deallocates a node flag which was previously allocated by a call to allocateFlag. More...

static MStatus	deallocateAllFlags (const MString pluginName)
	Deallocates all of the node flags which are currently allocated to the specified plugin. More...

static void	enableDGTiming (bool enable)
	Globally enables or disables the DG node timing mechanism. More...

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

Member Enumeration Documentation

enum Origin

Specifies the space to use for the deformation origin.

Enumerator
kLocalOrigin
kWorldOrigin

enum HistoryLocation

Specifies where in the shape's history to place the deformer (deformation order).

Enumerator
kFrontOfChain	Pre-Defromation.
kNormal	Automatic deformation order.
kPost	Post-Deformation.
kOther	Other deformation order.

enum TargetType

TODO.

Enumerator
kObject
kTangent

Constructor & Destructor Documentation

MFnBlendShapeDeformer	(	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

MFnBlendShapeDeformer	(	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

MObject create	(	MObject	baseObject,
		Origin	originSpace = `kLocalOrigin`,
		MStatus *	ReturnStatus = `NULL`
	)

Creates a new blend shape deformer in the dependency graph with the specified shape as the baseObject.

Parameters

[in]	baseObject	a base object for the deformer
[in]	originSpace	origin about which to deform
[out]	ReturnStatus	return status

Returns: A handle to the new deformer

Status Codes:

MS::kSuccess operation successful
MS::kInvalidParameter base object is null or is not of the correct type
MS::kLicenseFailure application not licensed for attempted operation
MS::kInsufficientMemory out of memory
MS::kFailure unexpected failure

MObject create	(	const MObjectArray &	baseObjects,
		Origin	originSpace = `kLocalOrigin`,
		HistoryLocation	historyLoc = `kNormal`,
		MStatus *	ReturnStatus = `NULL`
	)

Creates a new blend shape deformer in the dependency graph.

This method differs from the other MFnBlendShapeDeformer::create in that it allows multiple base shapes to be supplied at create time and it allows the use of the front-of-chain history location, which puts the blendShape ahead of other deformers such as skinning deformers.

Parameters

[in]	baseObjects	base object(s) for the deformer
[in]	originSpace	origin about which to deform
[in]	historyLoc	where in the shape's history to place the deformer
[out]	ReturnStatus	return status

Returns: A handle to the new deformer

Status Codes:

MS::kSuccess operation successful
MS::kInvalidParameter base object is not of the correct type
MS::kLicenseFailure application not licensed for attempted operation
MS::kInsufficientMemory out of memory
MS::kFailure unexpected failure

MStatus addBaseObject ( MObject & object )

Adds a new base object to the deformer.

This object will be deformed as targets are added for it and the deformation parameters change.

Parameters

[in] object new base object

Returns: Return status

Status Codes:

MS::kSuccess operation successful
MS::kInvalidParameter base object is null or is not of the correct type
MS::kInsufficientMemory out of memory
MS::kFailure this function set does not have a valid attribute object

MStatus getBaseObjects ( MObjectArray & objects ) const

Get a list of all of the base objects for this deformer.

The objects returned will be the deformed versions of the base objects.

Parameters

[out] objects storage for the array of base objects

Returns: Return status

Status Codes:

MS::kSuccess operation successful
MS::kInvalidParameter base object is null or is not of the correct type
MS::kInsufficientMemory out of memory
MS::kFailure this function set does not have a valid attribute object

MStatus addTarget	(	const MObject &	baseObject,
		int	weightIndex,
		const MObject &	newTarget,
		double	fullWeight,
		TargetType	targetType = `kObject`
	)

Adds a new target object for the given base object.

The weight index says which of the deformer's weight values will control this target's affects on the base object. The full weight argument determines at what weight the target is in full effect. If a base object has no other targets and the weight is set to the 'full weight', then the base object will look just like the target object.

Parameters

[in]	baseObject	base object for the target
[in]	weightIndex	weight index to use for target's effect
[in]	newTarget	new target object for the given base
[in]	fullWeight	weight value at which the target is in full effect
[in]	targetType	target type for the target

Returns: Return status

Status Codes:

MS::kSuccess operation successful
MS::kInvalidParameter base object or target object is null or is not of the correct type
MS::kInsufficientMemory out of memory
MS::kFailure this function set does not have a valid attribute object

MStatus addTarget	(	const MObject &	baseObject,
		int	weightIndex,
		double	fullWeight,
		TargetType	targetType = `kObject`
	)

Adds a new delta target object for the given base object.

The weight index says which of the deformer's weight values will control this target's affects on the base object. The full weight argument determines at what weight the target is in full effect. If a base object has no other targets and the weight is set to the 'full weight', then the base object will look just like the target object.

Parameters

[in]	baseObject	base object for the target
[in]	weightIndex	weight index to use for target's effect
[in]	fullWeight	weight value at which the target is in full effect
[in]	targetType	target type for the target

Returns: Return status

Status Codes:

MS::kSuccess operation successful
MS::kInvalidParameter base object or target object is null or is not of the correct type
MS::kInsufficientMemory out of memory
MS::kFailure this function set does not have a valid attribute object

MStatus removeTarget	(	const MObject &	baseObject,
		int	weightIndex,
		const MObject &	target,
		double	fullWeight
	)

Remove a target object for the given base object.

The weight index specifies the index at which target is connected. The full weight argument specifies at what weight the target is in full effect.

Parameters

[in]	baseObject	base object for the target
[in]	weightIndex	weight index corresponding to the target
[in]	target	target object for the given base to be removed
[in]	fullWeight	weight value at which the target is in full effect

Returns: Return status

Status Codes:

MS::kSuccess operation successful
MS::kInvalidParameter base object or target object is null or is not of the correct type
MS::kInsufficientMemory out of memory
MS::kFailure this function set does not have a valid attribute object

MStatus getTargets	(	MObject	baseObject,
		int	weightIndex,
		MObjectArray &	targetObjects
	)		const

Get a list of all of the target objects for the given base object that affect it based on the given weight index.

Parameters

[in]	baseObject	The base shape of interest.
[in]	weightIndex	The index of the weight attribute. Since the weight indices may be sparse, the weightIndexList method should be used to find the weight indices used by a given blendShape.
[out]	targetObjects	Storage for the returned array of target objects.

Returns: Return status

Status Codes:

MS::kSuccess operation successful
MS::kInvalidParameter base object is null or is not of the correct type, or the weightIndex is invalid.
MS::kInsufficientMemory out of memory
MS::kFailure this function set does not have a valid attribute object

unsigned int numWeights ( MStatus * ReturnStatus = NULL ) const

Return the number of weight values that this blend shape deformer has.

The number of weight values is equal to the number of targets. Targets are either shapes in the dag or baked data on the blendShape node (when a target shape is deleted).

Parameters

[out] ReturnStatus return status

Returns: The number of weight indices

Status Codes:

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

MStatus weightIndexList ( MIntArray & indexList ) const

Return the array index numbers corresponding to the targets.

The resulting index list will be the length of MFnBlendShape::numWeights. This method exists because the indices of the targets can be sparse. For example, if a target has been removed using Deform -> Edit BlendShape -> Remove.

Parameters

[out] indexList the array index numbers for the blendShape targets

Returns: The return status

Status Codes:

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

MStatus targetItemIndexList	(	unsigned int	weightIndex,
		MObject	baseObject,
		MIntArray &	targetItemIndices
	)		const

A base object may have more than one target using the same element of the blendShape's 'weights' array.

We refer to these as the base object's "target items" for that weight index.

Each target item should have a different 'fullWeight' value at which it takes full effect. As the value of the weights array element approaches the lowest of those 'fullWeight' values the associated target item has an increasing effect on the shape of the base object. As the value of the weights array element passes that first 'fullWeight' value and starts to approach the next higher 'fullWeight' value, the next target item starts to gain influence and the influence of the previous one drops off.

In this way, as the weight value increases, influence passes from one target item to another, allowing the target object to morph through a sequence of different target shapes.

Each target item is connected to an element of the blendShape deformer's 'inputTargetItem' array for that base object and weights array index. The inputTargetItem array index is calculated as follows: index = fullWeight * 1000 + 5000.

For example, if a base object has three different targetItems for a given weights array element, having fullWeight values of 0.5, 1.0 and 2.0, they will be connected to inputTargetItem array indices 5500, 6000 and 7000, respectively.

This method returns an array containing the inputTargetItem array indices of all the target items of a given base object which use the specified weight index.

Parameters

[in]	weightIndex	'weights' array index.
[in]	baseObject	The deformed object of interest
[out]	targetItemIndices	'inputTargetItem' array indices of the requested target items.

Returns: Return status

Status Codes:

MS::kSuccess operation successful
MS::kFailure function set does not have a valid object
MS::kInvalidIndex no target exists at the specified target index

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

Get the weight value at the given index.

To be valid, a weight value should only be requested at index values returned by MFnBlendShapeDeformer::weightIndexList.

Parameters

[in]	index	index of weight value
[out]	ReturnStatus	return status

Returns: The weight value

Status Codes:

MS::kSuccess operation successful
MS::kInvalidParameter the weightIndex is invalid.
MS::kFailure function set does not have a valid object

MStatus setWeight	(	unsigned int	index,
		float	weight
	)

Set the weight value at the given index.

Parameters

[in]	index	index of weight value
[in]	weight	new weight value

Returns: Return status

Status Codes:

MS::kSuccess operation successful
MS::kInvalidParameter the weightIndex is invalid.
MS::kFailure function set does not have a valid object

float envelope ( MStatus * ReturnStatus = NULL ) const

Gets the envelope value of the deformer.

The envelope is a global scale factor that is applied to all of the weight values in the deformer. The envelope can be used increase or decrease the effects of all of the targets at the same time.

Parameters

[out] ReturnStatus return status

Returns: Envelope value

Status Codes:

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

MStatus setEnvelope ( float envelope )

Sets the envelope value of the deformer.

The envelope is a global scale factor that is applied to all of the weight values in the deformer. The envelope can be used increase or decrease the effects of all of the targets at the same time.

Parameters

[in] envelope envelope value

Returns: Return status

Status Codes:

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

MFnBlendShapeDeformer::Origin origin ( MStatus * ReturnStatus = NULL ) const

Gets the origin space.

It defines the point around which the differences in the geometry are calculated.

Parameters

[out] ReturnStatus return status

Returns: The origin space

Status Codes:

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

MStatus setOrigin ( Origin space )

Sets the origin space.

It defines the point around which the differences in the geometry are calculated.

Parameters

[in] space origin space

Returns: The origin space

Status Codes:

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

MFnBlendShapeDeformer::HistoryLocation historyLocation ( MStatus * ReturnStatus = NULL ) const

Gets the history location (deformation order).

It defines where to place the deformer node in the chain.

Parameters

[out] ReturnStatus return status

Returns: The history location (deformation order)

Status Codes:

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

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

MFnBlendShapeDeformer.h
MFnBlendShapeDeformer.cpp

MFnBlendShapeDeformer Class Reference

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