#include <MPxSpringNode.h>

Class Description

Base class for user defined spring law.

MPxSpringNode allows the creation and manipulation of dependency graph nodes representing a spring law. The class is a DAG node and Maya manages the drawing, creation, and selection of springs.

A user defined spring node is a DAG node that can have attributes and a applySpringLaw() method. To derive the full benefit of the MPxSpringNode class, it is suggested that you do not write your own compute() method. Instead, write the applySpringLaw() method. All of the parameters passed into this method will be supplied by Maya.

To create a user defined spring node, derive from this class and override the applySpringLaw() method. The other methods of the parent class MPxNode may also be overridden to perform dependency node capabilities.

Examples:: simpleSpring/simpleSpring.h.

Inheritance diagram for MPxSpringNode:

Public Member Functions
	MPxSpringNode ()
	Class constructor.

virtual	~MPxSpringNode ()
	Class destructor.

virtual MPxNode::Type	type () const
	This method returns the type of the node. More...

virtual MStatus	applySpringLaw (double stiffness, double damping, double restLength, double endMass1, double endMass2, const MVector &endP1, const MVector &endP2, const MVector &endV1, const MVector &endV2, MVector &forceV1, MVector &forceV2)
	This method should be overridden in user defined nodes. More...

Public Member Functions inherited from MPxNode
	MPxNode ()
	Constructor. More...

virtual	~MPxNode ()
	Destructor.

virtual void	postConstructor ()
	Post constructor. More...

virtual MStatus	compute (const MPlug &, MDataBlock &)
	This method should be overridden in user defined nodes. More...

virtual bool	getInternalValue (const MPlug &, MDataHandle &)
	This method is overridden by nodes that store attribute data in some internal format. More...

virtual bool	setInternalValue (const MPlug &, const MDataHandle &)
	This method is overridden by nodes that store attribute data in some internal format. More...

virtual int	internalArrayCount (const MPlug &) const
	This method is overridden by nodes that have internal array attributes which are not stored in Maya's datablock. More...

virtual void	copyInternalData (MPxNode *)
	This method is overridden by nodes that store attribute data in some internal format. More...

virtual MStatus	legalConnection (const MPlug &, const MPlug &, bool asSrc, bool &isLegal) const
	This method allows you to check for legal connections being made to attributes of this node. More...

virtual MStatus	legalDisconnection (const MPlug &, const MPlug &, bool asSrc, bool &isLegal) const
	This method allows you to check for legal disconnections being made to attributes of this node. More...

virtual MStatus	setDependentsDirty (const MPlug &plug, MPlugArray &plugArray)
	This method can be overridden in user defined nodes to specify which plugs should be set dirty based upon an input plug {plugBeingDirtied} which Maya is marking dirty. More...

virtual MStatus	preEvaluation (const MDGContext &context, const MEvaluationNode &evaluationNode)
	Prepare a node's internal state for threaded evaluation. More...

virtual MStatus	postEvaluation (const MDGContext &context, const MEvaluationNode &evaluationNode, PostEvaluationType evalType)
	Clean up node's internal state after threaded evaluation. More...

virtual SchedulingType	schedulingType () const
	When overridden this method controls the degree of parallelism supported by the node during threaded evaluation. More...

virtual MStatus	connectionMade (const MPlug &, const MPlug &, bool asSrc)
	This method gets called when connections are made to attributes of this node. More...

virtual MStatus	connectionBroken (const MPlug &, const MPlug &, bool asSrc)
	This method gets called when connections are broken with attributes of this node. More...

virtual MStatus	dependsOn (const MPlug &, const MPlug &, bool &depends) const
	This method may be overridden by the user defined node. More...

virtual bool	isPassiveOutput (const MPlug &) const
	This method may be overridden by the user defined node if it wants to provide output attributes which do not prevent value modifications to the destination attribute. More...

virtual MStatus	shouldSave (const MPlug &, bool &isSaving)
	This method may be overridden by the user defined node. More...

virtual MPlug	passThroughToOne (const MPlug &) const
	This method may be overridden by nodes that have a one-to-one relationship between an input attribute and a corresponding output attribute. More...

virtual bool	passThroughToMany (const MPlug &, MPlugArray &) const
	This method is overridden by nodes that want to control the traversal behavior of some Maya search algorithms which traverse the history/future of shape nodes looking for directly related nodes. More...

virtual bool	isAbstractClass () const
	Override this class to return true if this node is an abstract node. More...

virtual MStringArray	getFilesToArchive (bool shortName=false, bool unresolvedName=false, bool markCouldBeImageSequence=false) const
	Use this method to return all external files used by this node. More...

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

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

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

virtual void	setExternalContent (const MExternalContentLocationTable &)
	Changes the location of external content in batch. More...

virtual MTypeId	typeId () const
	Returns the TYPEID of this node. More...

virtual MString	typeName () const
	Returns the type name of this node. More...

virtual MString	name () const
	Returns the name of this particular instance of this class. More...

virtual MObject	thisMObject () const
	Returns the MObject associated with this user defined node. More...

virtual MStatus	setExistWithoutInConnections (bool flag)
	This method specifies whether or not the node can exist without input connections. More...

virtual bool	existWithoutInConnections (MStatus *ReturnStatus=NULL) const
	Determines whether or not this node can exist without input connections. More...

virtual MStatus	setExistWithoutOutConnections (bool flag)
	This method specifies whether or not the node can exist without output connections. More...

virtual bool	existWithoutOutConnections (MStatus *ReturnStatus=NULL) const
	Determines whether or not this node can exist without output connections. More...

MDataBlock	_forceCache (const MDGContext &)
	This method is obsolete. More...

virtual bool	getInternalValueInContext (const MPlug &, MDataHandle &, MDGContext &)
	This method is obsolete. More...

virtual bool	setInternalValueInContext (const MPlug &, const MDataHandle &, MDGContext &)
	This method is obsolete. More...

virtual int	internalArrayCount (const MPlug &, const MDGContext &) const
	This method is obsolete. More...

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

Static Public Member Functions inherited from MPxNode
static MStatus	addAttribute (const MObject &attr)
	This method adds a new attribute to a user defined node type during the type's initialization. More...

static MStatus	inheritAttributesFrom (const MString &parentClassName)
	This method allows a class of plugin node to inherit all of the attributes of a second class of plugin node. More...

static MStatus	attributeAffects (const MObject &whenChanges, const MObject &isAffected)
	This method specifies that a particular input attribute affects a specific output attribute. More...

static const char *	className ()
	Returns the name of this class. More...

Static Public Attributes
static MObject	mEnd1Weight
	from end weight attribute

static MObject	mEnd2Weight
	to end weight attribute

static MObject	mDeltaTime
	delta time attribute

Static Public Attributes inherited from MPxNode
static MObject	message
	message attribute

static MObject	isHistoricallyInteresting
	is historically interesting attribute

static MObject	caching
	caching attribute

static MObject	state
	state attribute

static MObject	frozen
	frozen attribute

Additional Inherited Members
Public Types inherited from MPxNode
enum	Type { kDependNode, kLocatorNode, kDeformerNode, kManipContainer, kSurfaceShape, kFieldNode, kEmitterNode, kSpringNode, kIkSolverNode, kHardwareShader, kHwShaderNode, kTransformNode, kObjectSet, kFluidEmitterNode, kImagePlaneNode, kParticleAttributeMapperNode, kCameraSetNode, kConstraintNode, kManipulatorNode, kMotionPathNode, kClientDeviceNode, kThreadedDeviceNode, kAssembly, kSkinCluster, kGeometryFilter, kBlendShape, kLast }
	Defines the type of node. More...

enum	SchedulingType { kParallel, kSerial, kGloballySerial, kUntrusted , kDefaultScheduling = kSerial, kSerialize = kSerial, kGloballySerialize = kGloballySerial }
	Defines the degree of parallelism of a node. More...

Protected Member Functions inherited from MPxNode
virtual MDataBlock	forceCache ()
	USE _forceCache() IN SCRIPT. More...

virtual void	setMPSafe (bool flag)
	USE _setMPSafe() IN SCRIPT. More...

virtual MStatus	setDoNotWrite (bool flag)
	USE _setDoNotWrite() IN SCRIPT. More...

virtual bool	doNotWrite (MStatus *ReturnStatus=NULL) const
	USE _doNotWrite() IN SCRIPT. More...

virtual MDataBlock	forceCache (const MDGContext &)
	This method is obsolete. More...

Member Function Documentation

MPxNode::Type type ( ) const

virtual

This method returns the type of the node.

It should not be overridden by the user. It will return MPxNode::kSpringNode.

Returns: The type of node

Status Codes:

MS::kSuccess The undo was successful
MS::kFailure This method is not undoable

Reimplemented from MPxNode.

MStatus applySpringLaw	(	double	stiffness,
		double	damping,
		double	restLength,
		double	endMass1,
		double	endMass2,
		const MVector &	endP1,
		const MVector &	endP2,
		const MVector &	endV1,
		const MVector &	endV2,
		MVector &	forceV1,
		MVector &	forceV2
	)

virtual

This method should be overridden in user defined nodes.

Parameters

[in]	stiffness	The strength with which springs are trying to maintain their length.
[in]	damping	How strongly the motion of springs are damped by the 'physical' properties of the springs. A larger value makes the springs converge faster to their rest length.
[in]	restLength	The length at which springs try to stay.
[in]	endMass1	The mass value at one end of the spring.
[in]	endMass2	The mass value at the other end of the spring.
[in]	endP1	The position of one end of the spring.
[in]	endP2	The position of the other end of the spring.
[in]	endV1	The velocity of one end of the spring.
[in]	endV2	The velocity of the other end of the spring.
[in]	forceV1	The output force vector at one end of the spring.
[in]	forceV2	The output force vector at the other end of the spring.

Returns: Status code

Status Codes:

MS::kSuccess Compute was successful.
MS::kFailure Compute failed.

Examples:: simpleSpring/simpleSpring.h.

const char * className ( )

static

Returns the name of this class.

Returns: The name of this class.

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

MPxSpringNode.h
MPxSpringNode.cpp

MPxSpringNode Class Reference

Class Description

Public Member Functions

Static Public Member Functions

Static Public Attributes

Additional Inherited Members

Member Function Documentation