#include <MFnField.h>

Class Description

Function set for Dynamic Fields.

Function set for creation, edit, and query of Dynamic Fields.

There are several types of dynamic fields: Air, Drag, Gravity, Newton Radial, Turbulence, Uniform, and Vortex.

Inheritance diagram for MFnField:

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

virtual	~MFnField ()
	Destructor. More...

	MFnField ()
	Default constructor.

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

	MFnField (const MDagPath &object, MStatus *ret=NULL)
	Constructor. More...

MStatus	getForceAtPoint (const MPointArray &point, const MVectorArray &velocity, const MDoubleArray &mass, MVectorArray &force, double deltaTime=1.0/24.0)
	Compute the force of a field on an array of points, given their position, velocity, and mass. More...

MStatus	getForceAtPoint (const MVectorArray &point, const MVectorArray &velocity, const MDoubleArray &mass, MVectorArray &force, double deltaTime=1.0/24.0)
	Compute the force of a field on an array of points, given their position, velocity, and mass. More...

double	magnitude (MStatus *ReturnStatus=NULL) const
	Returns the strength of the field. More...

MStatus	setMagnitude (double mag)
	Sets the strength of the field. More...

double	attenuation (MStatus *ReturnStatus=NULL) const
	Returns the rate of change where the strength of the field changes as the distance between the field and the affected object increases. More...

MStatus	setAttenuation (double atten)
	Sets the rate of change where the strength of the field changes as the distance between the field and the affected object increases. More...

double	maxDistance (MStatus *ReturnStatus=NULL) const
	Returns the maximum distance from the field at which the force of the field is exerted. More...

MStatus	setMaxDistance (double maxDist)
	Sets the maximum distance from the field at which the force of the field is exerted. More...

bool	perVertex (MStatus *ReturnStatus=NULL) const
	Returns true if the field exerts its force on each individual point (cv, particle, vertex) equally. More...

MStatus	setPerVertex (bool enable)
	Enables the field to exert its force on each individual point (cv, particle, vertex) equally. More...

bool	useMaxDistance (MStatus *ReturnStatus=NULL) const
	Returns true if the field will use the maximum distance setting to determine the area of influence. More...

MStatus	setUseMaxDistance (bool enable)
	Enables the field to use the maximum distance setting to determine the area of influence. More...

double	falloffCurve (const double param, MStatus *ReturnStatus=NULL)
	Returns falloff given the param in [0,1]. More...

bool	isFalloffCurveConstantOne (MStatus *ReturnStatus=NULL)
	Returns true if falloffCurve is a constant one (default) or false if not. More...

	MFnField (const MObject &object, MStatus *ret=NULL)
	Constructor. More...

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

	MFnDagNode ()
	Class Constructor. More...

	MFnDagNode (MObject &object, MStatus *ret=NULL)
	This method is not available in Python. More...

	MFnDagNode (const MDagPath &object, MStatus *ret=NULL)
	Class Constructor. More...

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

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

MObject	create (const MString &type, MObject &parent=MObject::kNullObj, MStatus *ReturnStatus=NULL)
	Creates a new DAG node with the given type tag. More...

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

unsigned int	parentCount (MStatus *ReturnStatus=NULL) const
	Determines the number of parent Nodes of the Node. More...

MObject	parent (unsigned int i, MStatus *ReturnStatus=NULL) const
	Queries the DAG Node attached to the Function Set for the parent Node corresponding to the given index. More...

MStatus	addChild (MObject &child, unsigned int index=kNextPos, bool keepExistingParents=false)
	Makes the given DAG Node a child of the DAG Node to which this instance of the Function Set is attached. More...

MStatus	removeChild (MObject &child)
	Removes the given DAG Node from the parent. More...

MStatus	removeChildAt (unsigned int index)
	Removes the child at the given index from the parent. More...

unsigned int	childCount (MStatus *ReturnStatus=NULL) const
	Determines the number of child Nodes of the Node. More...

MObject	child (unsigned int i, MStatus *ReturnStatus=NULL) const
	Queries the DAG Node attached to the Function Set for the child Node corresponding to the given index. More...

MObject	dagRoot (MStatus *ReturnStatus=NULL)
	Determines the root of the first DAG Path to the DAG Node attached to the Function Set. More...

bool	hasParent (const MObject &node, MStatus *ReturnStatus=NULL) const
	Determines whether or not the given Node is a parent of the DAG Node attached to the Function Set. More...

bool	hasChild (const MObject &node, MStatus *ReturnStatus=NULL) const
	Determines whether or not the given Node is a child of the DAG Node attached to the Function Set. More...

bool	isChildOf (const MObject &node, MStatus *ReturnStatus=NULL) const
	Determines whether or not the DAG Node attached to the Function Set is a child of the given node. More...

bool	isParentOf (const MObject &node, MStatus *ReturnStatus=NULL) const
	Determines whether or not the DAG Node attached to the Function Set is a parent of the given node. More...

bool	inUnderWorld (MStatus *ReturnStatus=NULL) const
	Determines whether or not the DAG Node is an underworld node. More...

bool	inModel (MStatus *ReturnStatus=NULL) const
	Determines whether or not the DAG Node is in the model. More...

bool	isInstanceable (MStatus *ReturnStatus=NULL) const
	Returns true if the DAG node can be instanced, and false otherwise. More...

MStatus	setInstanceable (const bool how)
	Sets whether or not the DAG node is instanceable. More...

bool	isInstanced (bool indirect=true, MStatus *ReturnStatus=NULL) const
	Determines whether the DAG Node attached to the Function Set is directly or indirectly instanced. More...

bool	isInstancedAttribute (const MObject &attr, MStatus *ReturnStatus=NULL) const
	Returns true if the specified attribute is instanced. More...

unsigned int	instanceCount (bool total, MStatus *ReturnStatus=NULL) const
	Determines the number of times the Node attached to the Function Set is instanced. More...

MObject	duplicate (bool instance=false, bool instanceLeaf=false, MStatus *ReturnStatus=NULL) const
	This method duplicates the DAG hierarchy rooted at the current node. More...

MStatus	getPath (MDagPath &path) const
	Returns a DAG Path to the DAG Node attached to the Function Set. More...

MStatus	getAllPaths (MDagPathArray &paths) const
	Determines all DAG Paths to the DAG Node attached to the Function Set. More...

MString	fullPathName (MStatus *ReturnStatus=NULL) const
	Return a string representing the full path from the root of the dag to this object. More...

MString	partialPathName (MStatus *ReturnStatus=NULL) const
	Return a string representing the partial path from the root of the dag to this object. More...

MMatrix	transformationMatrix (MStatus *ReturnStatus=NULL) const
	Returns the object space transformation matrix for this DAG node. More...

bool	isIntermediateObject (MStatus *ReturnStatus=NULL) const
	Returns true if this object is an intermediate in a geometry calculation. More...

MStatus	setIntermediateObject (bool isIntermediate)
	Sets whether this object is an intermediate in a geometry calculation. More...

int	objectColor (MStatus *ReturnStatus=NULL) const
	This method is obsolete. More...

MStatus	setObjectColor (int color)
	Sets the index for the current user defined inactive color used by the node. More...

bool	usingObjectColor (MStatus *ReturnStatus=NULL) const

MStatus	setUseObjectColor (bool useObjectColor)

MObjectColorType	objectColorType (MStatus *ReturnStatus=NULL) const
	Determines whether or not the user defined inactive color will be used for the node, or whether the default inactive color will be used. More...

MStatus	setObjectColorType (MObjectColorType type)
	Sets whether or not the user defined inactive object color will be used. More...

MStatus	setObjectColor (const MColor &color)
	Sets the color value for the current user defined inactive color used by the node. More...

MColor	objectColorRGB (MStatus *ReturnStatus=NULL) const
	Determines the RGB color for the current user defined inactive color used by the node. More...

int	objectColorIndex (MStatus *ReturnStatus=NULL) const
	Determines the index for the current user defined inactive color used by the node. More...

MColor	hiliteColor (MStatus *ReturnStatus=NULL) const
	Determines the current hilite color used by the node. More...

bool	usingHiliteColor (MStatus *ReturnStatus=NULL) const
	Determines whether or not the hilite color will be used for the node. More...

MColor	dormantColor (MStatus *ReturnStatus=NULL) const
	Determines the dormant color used by this node. More...

MColor	activeColor (MStatus *ReturnStatus=NULL) const
	Determines the active color used by this node. More...

bool	drawOverrideEnabled (MStatus *ReturnStatus=NULL) const
	Determines whether or not draw override is turned on for this node. More...

bool	drawOverrideIsReference (MStatus *ReturnStatus=NULL) const
	Determines whether or not Display Type of the draw override is Reference for this node. More...

bool	drawOverrideIsTemplate (MStatus *ReturnStatus=NULL) const
	Determines whether or not Display Type of the draw override is Template for this node. More...

bool	drawOverrideColor (MColor &color, MStatus *ReturnStatus=NULL) const
	Determines the draw override color used by this node. More...

MStatus	getConnectedSetsAndMembers (unsigned int instanceNumber, MObjectArray &sets, MObjectArray &comps, bool renderableSetsOnly) const
	Returns all the sets connected to the specified instance of this DAG object. More...

MBoundingBox	boundingBox (MStatus *ReturnStatus=NULL) const
	Returns the bounding box for the dag node in object space. More...

MDagPath	dagPath (MStatus *ReturnStatus=NULL) const
	Returns the DagPath to which the Function Set is attached. More...

virtual MStatus	setObject (const MDagPath &path)
	Attaches Function Set to the DAG Node that has the given DAG Path. More...

virtual MStatus	setObject (MObject &object)
	Attaches Function Set to given DAG Node. More...

MObject	model (MStatus *ReturnStatus=NULL) const
	This method is obsolete. More...

	MFnDagNode (const MObject &object, MStatus *ret=NULL)
	No script support. More...

virtual MStatus	setObject (const MObject &object)
	No script support. 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...

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

Additional Inherited Members
Public Types inherited from MFnDagNode
enum	{ kNextPos = 0xff }
	Anonymous enum to store constant values. More...

enum	MObjectColorType { kUseDefaultColor = 0, kUseIndexColor, kUseRGBColor }
	Enum to set how an object is colored. 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...

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...

Constructor & Destructor Documentation

~MFnField ( )

virtual

Destructor.

Class destructor.

MFnField	(	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

MFnField	(	const MDagPath &	object,
		MStatus *	ReturnStatus = `NULL`
	)

Constructor.

Class constructor that initializes the function set to the given constant MDagPath object.

Parameters

[in]	object	The const MDagPath 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

MFnField	(	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

MStatus getForceAtPoint	(	const MPointArray &	point,
		const MVectorArray &	velocity,
		const MDoubleArray &	mass,
		MVectorArray &	force,
		double	deltaTime = `1.0 / 24.0`
	)

Compute the force of a field on an array of points, given their position, velocity, and mass.

Note that only the Air and Vortex fields require a time increment to compute forces, all other fields will ignore this argument.

This method uses MPointArray to represent the positions of points. If a point instance is in a rational form or a homogenous form, you should reset it to be in the cartesian form P(x, y, z, 1).

Parameters

[in]	point	array of positions for each point.
[in]	velocity	array of velocities for each point. If the length of the velocity array is 0, a velocity of 0.0 is assumed for all the points. Note the velocity array is a requirement for the Air and Drag fields to compute forces.
[in]	mass	array of mass values for each point. If the length of the mass array is 0, a mass of 1.0 is assumed for all the points.
[out]	force	output array of forces applied to each point. If the length of the force array supplied is 0, the array is automatically resized. If the contents of the force array contains data, the computed force is added to the supplied data. This can be useful to accumulate forces of multiple fields.
[in]	deltaTime	time increment in seconds for usage with the Air and Vortex fields. Default is (1.0 / 24.0 fps).

Returns: Status code

Status Codes:

MS::kSuccess The method was successful.
MS::kFailure An object error has occurred.

MStatus getForceAtPoint	(	const MVectorArray &	point,
		const MVectorArray &	velocity,
		const MDoubleArray &	mass,
		MVectorArray &	force,
		double	deltaTime = `1.0 / 24.0`
	)

Compute the force of a field on an array of points, given their position, velocity, and mass.

Note that only the Air and Vortex fields require a time increment to compute forces, all other fields will igonore this argument.

This method uses MVectorArray to represent the positions of a point.

Parameters

[in]	point	array of positions for each point.
[in]	velocity	array of velocities for each point. If the length of the velocity array is 0, a velocity of 0.0 is assumed for all the points. Note the velocity array is a requirement for the Air and Drag fields to compute forces.
[in]	mass	array of mass values for each point. If the length of the mass array is 0, a mass of 1.0 is assumed for all the points.
[out]	force	output array of forces applied to each point. If the length of the force array supplied is 0, the array is automatically resized. If the contents of the force array contains data, the computed force is added to the supplied data. This can be useful to accumulate forces of multiple fields.
[in]	deltaTime	time increment in seconds for usage with the Air and Vortex fields. Default is (1.0 / 24.0 fps).

Returns: Status code

Status Codes:

MS::kSuccess The method was successful.
MS::kFailure An object error has occurred.

double magnitude ( MStatus * ReturnStatus = NULL ) const

Returns the strength of the field.

Parameters

[out] ReturnStatus Status code

Returns: A value representing the strength of the field.

Status Codes:

MS::kSuccess The method was successful.
MS::kFailure An object error has occurred.

MStatus setMagnitude ( double mag )

Sets the strength of the field.

Parameters

[in] mag A value representing the strength of the field.

Returns: Status code

Status Codes:

MS::kSuccess The method was successful.
MS::kFailure An object error has occurred.

double attenuation ( MStatus * ReturnStatus = NULL ) const

Returns the rate of change where the strength of the field changes as the distance between the field and the affected object increases.

Parameters

[out] ReturnStatus Status code

Returns

A positive value representing the exponent for rate of change.
A value of 0 and the force remains constant over distance.

Status Codes:

MS::kSuccess The method was successful.
MS::kFailure An object error has occurred.

MStatus setAttenuation ( double atten )

Sets the rate of change where the strength of the field changes as the distance between the field and the affected object increases.

Parameters

[in] atten A positive value representing the exponent for rate of change. A value of 0 and the force remains constant over distance.

Returns: Status code

Status Codes:

MS::kSuccess The method was successful.
MS::kFailure An object error has occurred.

double maxDistance ( MStatus * ReturnStatus = NULL ) const

Returns the maximum distance from the field at which the force of the field is exerted.

The Use Max Distance setting must be turned on for maximum distance to take effect. The maximum distance is scaled by the falloff curve's non-zero range.

Parameters

[out] ReturnStatus Status code

Returns: A value representing distance in internal linear units.

Status Codes:

MS::kSuccess The method was successful.
MS::kFailure An object error has occurred.

MStatus setMaxDistance ( double dist )

Sets the maximum distance from the field at which the force of the field is exerted.

The Use Max Distance setting must be turned on for maximum distance to take effect.

Parameters

[in] dist A value representing distance in internal linear units.

Returns: Status code

Status Codes:

MS::kSuccess The method was successful.
MS::kFailure An object error has occurred.

bool perVertex ( MStatus * ReturnStatus = NULL ) const

Returns true if the field exerts its force on each individual point (cv, particle, vertex) equally.

Returns false if the force is exerted only from the geometric center of the object or set of points.

Parameters

[out] ReturnStatus Status code

Returns

true Force is applied to each individual point.
false Force is applied from the geometric center.

Status Codes:

MS::kSuccess The method was successful.
MS::kFailure An object error has occurred.

MStatus setPerVertex ( bool enable )

Enables the field to exert its force on each individual point (cv, particle, vertex) equally.

Otherwise, the force is exerted only from the geometric center of the object or set of points.

Parameters

[in] enable Flag to enable or disable individual point forces.

Returns: Status code

Status Codes:

MS::kSuccess The method was successful.
MS::kFailure An object error has occurred.

bool useMaxDistance ( MStatus * ReturnStatus = NULL ) const

Returns true if the field will use the maximum distance setting to determine the area of influence.

Parameters

[out] ReturnStatus Status code

Returns

true Field uses the maximum distance setting.
false Field ignores the maximum distance setting.

Status Codes:

MS::kSuccess The method was successful.
MS::kFailure An object error has occurred.

MStatus setUseMaxDistance ( bool enable )

Enables the field to use the maximum distance setting to determine the area of influence.

Parameters

[in] enable Flag to enable or disable maximum distance.

Returns: Status code

Status Codes:

MS::kSuccess The method was successful.
MS::kFailure An object error has occurred.

double falloffCurve	(	const double	param,
		MStatus *	ReturnStatus = `NULL`
	)

Returns falloff given the param in [0,1].

This is enabled if the use the maximum distance is enabled.

Parameters

[in]	param	Parameter
[out]	ReturnStatus	Status code

Returns: The falloff value given the param.

Status Codes:

MS::kSuccess The method was successful.
MS::kFailure An object error has occurred.

bool isFalloffCurveConstantOne ( MStatus * ReturnStatus = NULL )

Returns true if falloffCurve is a constant one (default) or false if not.

Parameters

[out] ReturnStatus Status code

Returns: If falloff curve always returns a constant one

Status Codes:

MS::kSuccess The method was successful.
MS::kFailure An object error has occurred.

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

MFnField.h
MFnField.cpp

MFnField Class Reference

Class Description

Public Member Functions

Protected Member Functions

Additional Inherited Members

Constructor & Destructor Documentation

Member Function Documentation