#include <MPxFluidEmitterNode.h>

Class Description

Base class for user defined particle emitters.

MPxFluidEmitterNode allows the creation and manipulation of dependency graph nodes representing fluid emitters.

Examples:: simpleFluidEmitter/simpleFluidEmitter.h.

Inheritance diagram for MPxFluidEmitterNode:

Public Member Functions
	MPxFluidEmitterNode ()
	Class constructor.

virtual	~MPxFluidEmitterNode ()
	The class destructor.

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

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

virtual MStatus	fluidEmitter (const MObject &fluidObj, const MMatrix &worldMatrix, int plugIndex)
	This is the main method that plug-in fluid emitter nodes must override in order to emit into fluids. More...

double	fluidDensityEmission (MDataBlock &block)
	Intended to be called from within the emitter's compute() method, this method retrieves the "fluidDensityEmission" attribute value common to all fluid emitters. More...

double	fluidHeatEmission (MDataBlock &block)
	Intended to be called from within the emitter's compute() method, this method retrieves the "fluidHeatEmission" attribute value common to all fluid emitters. More...

double	fluidFuelEmission (MDataBlock &block)
	Intended to be called from within the emitter's compute() method, this method retrieves the "fluidFuelEmission" attribute value common to all fluid emitters. More...

bool	fluidEmitColor (MDataBlock &block)
	Intended to be called from within the emitter's compute() method, this method retrieves the "fluidEmitColor" attribute value common to all fluid emitters. More...

MColor	fluidColor (MDataBlock &block)
	Intended to be called from within the emitter's compute() method, this method retrieves the "fluidColor" attribute value common to all fluid emitters. More...

double	fluidDropoff (MDataBlock &block)
	Intended to be called from within the emitter's compute() method, this method retrieves the "fluidDropoff" attribute value common to all fluid emitters. More...

double	turbulence (MDataBlock &block)
	Intended to be called from within the emitter's compute() method, this method retrieves the "turbulence" attribute value common to all fluid emitters. More...

bool	fluidJitter (MDataBlock &block)
	Intended to be called from within the emitter's compute() method, this method retrieves the "fluidJitter" attribute value common to all fluid emitters. More...

Public Member Functions inherited from MPxEmitterNode
	MPxEmitterNode ()
	Class constructor.

virtual	~MPxEmitterNode ()
	The class destructor.

virtual void	draw (M3dView &view, const MDagPath &path, M3dView::DisplayStyle style, M3dView::DisplayStatus)
	Overriding this method allows the drawing of custom geometry using standard OpenGL calls. More...

MEmitterType	getEmitterType (MDataBlock &block)
	Retrieves the type of the emitter, determined by the "emitterType" attribute value. More...

MObject	getOwnerShape ()
	If the emitter is a emitting from an object, this method returns the shape node for the object. More...

MTime	getCurrentTime (MDataBlock &block)
	Intended to be called from within the emitter's compute() method, this method returns the time at which the emitter is currently being evaluated. More...

MTime	getStartTime (int plugIndex, MDataBlock &block)
	Intended to be called from within the emitter's compute() method, this method returns the start times for each particle system or fluid into which the emitter is emitting. More...

MTime	getDeltaTime (int plugIndex, MDataBlock &block)
	Intended to be called from within the emitter's compute() method, this method returns the width of the time interval represented by the current emitter evaluation. More...

int	getRandomSeed (int plugIndex, MDataBlock &block)
	Intended to be called from within the emitter's compute() method, this method returns the random seed for a specified emission target (particle system or fluid shape into which the emitter is emitting). More...

void	getRandomState (int plugIndex, MDataBlock &block)
	Intended to be called from within the emitter's compute() method, this method copies the emitter node attribute representing the current random state for a particular emitter target into a local variable on the emitter object, to facilitate efficient random number generation using the randgen() method. More...

void	setRandomState (int plugIndex, MDataBlock &block)
	Intended to be called from within the emitter's compute() method, this method copies the emitter node class random state data member onto the emitter node's random state attribute. More...

void	resetRandomState (int plugIndex, MDataBlock &block)
	Intended to be called from within the emitter's compute() method, this method resets the emitter's random state data member. More...

double	randgen ()
	Intended to be called from within the emitter's compute() method, this method generates a double-precision random number in the rand [0,1]. More...

double	getRate (MDataBlock &block)
	Intended to be called from within the emitter's compute() method, this method retrieves the "rate" attribute value common to all particle and fluid emitters. More...

double	getMinDistance (MDataBlock &block)
	Intended to be called from within the emitter's compute() method, this method retrieves the "minDistance" attribute value common to all particle and fluid emitters. More...

double	getMaxDistance (MDataBlock &block)
	Intended to be called from within the emitter's compute() method, this method retrieves the "maxDistance" attribute value common to all particle and fluid emitters. More...

MPoint	getWorldPosition ()
	Returns the worldspace coordinates of the emitter. More...

MMatrix	getWorldMatrix ()
	Returns the matrix that maps from the emitter's local space coordinates to worldspace. More...

bool	volumePrimitiveBoundingBox (MBoundingBox &box)
	For volume emitters, this method returns the object-space bounding box of the volume primitive associated with the emitter. More...

bool	volumePrimitivePointInside (const MPoint &worldPoint, const MMatrix &emitterWorldMatrix)
	For volume emitters, this method determines whether a particular point in space lies within the volume defined by the emitter's volume primitive. More...

double	volumePrimitiveDistanceFromAxis (const MPoint &worldPoint, const MMatrix &emitterWorldMatrix)
	For volume emitters, this method determines the distance from a particular point to the major axis of the volumetric primitive associated with the emitter. More...

bool	hasValidEmission2dTexture (const MObject &texAttr, MStatus *status=NULL)
	Certain aspects of Maya's particle and fluid emitters can be textured using 2d textures. More...

MStatus	evalEmission2dTexture (const MObject &texAttr, MDoubleArray &uCoords, MDoubleArray &vCoords, MVectorArray resultColors, MDoubleArray resultAlphas)
	If a supported 2d texture (see hasValidEmission2dTexture() method documentation) is connected to the given emitter attribute, this method can be called to evaluate that texture at a number of (u,v) texture coordinate values. More...

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

virtual	~MPxNode ()
	Destructor.

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

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

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

virtual bool	getInternalValue (const MPlug &plug, MDataHandle &dataHandle)
	This method is obsolete. More...

virtual bool	setInternalValue (const MPlug &plug, const MDataHandle &dataHandle)
	This method is obsolete. More...

virtual int	internalArrayCount (const MPlug &plug, const MDGContext &ctx) 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 &plug, const MPlug &otherPlug, 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 &plug, const MPlug &otherPlug, 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 &plug, const MPlug &otherPlug, bool asSrc)
	This method gets called when connections are made to attributes of this node. More...

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

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

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

virtual MPlug	passThroughToOne (const MPlug &plug) 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 &plug, MPlugArray &plugArray) 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 &table, const MObject &attr) const
	Adds content info to the specified table from a file path attribute. More...

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

virtual void	setExternalContent (const MExternalContentLocationTable &table)
	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...

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

Static Public Member Functions inherited from MPxEmitterNode
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	mFluidDensityEmission
	density emission rate attribute

static MObject	mFluidHeatEmission
	heat emission rate attribute

static MObject	mFluidFuelEmission
	fuel emission rate attribute

static MObject	mEmitFluidColor
	color emission toggle attribute

static MObject	mFluidColor
	emission color attribute

static MObject	mFluidColorR
	emission red color channel attribute

static MObject	mFluidColorG
	emission green color channel attribute

static MObject	mFluidColorB
	emission blue color channel attribute

static MObject	mFluidDropoff
	emission dropoff attribute

static MObject	mTurbulence
	emission turbulence attribute

static MObject	mFluidJitter
	emission jitter attribute

static MObject	mEmissionFunction
	emission function attribute

Static Public Attributes inherited from MPxEmitterNode
static MObject	mEmitterType
	emitter type attribute

static MObject	mRate
	rate attribute

static MObject	mSpeed
	speed attribute

static MObject	mDirection
	direction attribute

static MObject	mDirectionX
	X component of mDirection.

static MObject	mDirectionY
	Y component of mDirection.

static MObject	mDirectionZ
	Z component of mDirection.

static MObject	mOwnerPosData
	owner postion attribute, multi

static MObject	mOwnerVelData
	owner velocity attribute, multi

static MObject	mOwnerCentroid
	owner centroid attribute

static MObject	mOwnerCentroidX
	X component of mOwnerCentroid.

static MObject	mOwnerCentroidY
	Y component of mOwnerCentroid.

static MObject	mOwnerCentroidZ
	Z component of mOwnerCentroid.

static MObject	mSweptGeometry
	input swept geometry attribute

static MObject	mWorldMatrix
	world matrix attribute

static MObject	mStartTime
	start time attribute

static MObject	mDeltaTime
	delta time attribute

static MObject	mIsFull
	flag for maximum count attribute

static MObject	mInheritFactor
	inherit factor attribute

static MObject	mSeed
	random seed attribute

static MObject	mRandState
	random state attribute

static MObject	mCurrentTime
	current time attribute

static MObject	mOutput
	output particle attribute, multi

static MObject	mMinDistance
	min distance attribute

static MObject	mMaxDistance
	max distance 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 MPxEmitterNode
enum	MEmitterType { kDirectional = 0, kOmni, kSurface, kCurve, kVolume }
	Types of emitters. More...

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 }
	Defines the degree of parallelism of a node. More...

Protected Member Functions inherited from MPxNode
virtual MDataBlock	forceCache (MDGContext &ctx=MDGContext::fsNormal)
	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...

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::kEmitterNode.

Returns: The type of node

Reimplemented from MPxEmitterNode.

MStatus compute	(	const MPlug &	plug,
		MDataBlock &	dataBlock
	)

virtual

This method should be overridden in user defined nodes.

Recompute the given output based on the nodes inputs. The plug represents the data value that needs to be recomputed, and the data block holds the storage for all of the node's attributes.

The MDataBlock will provide smart handles for reading and writing this node's attribute values. Only these values should be used when performing computations.

When evaluating the dependency graph, Maya will first call the compute method for this node. If the plug that is provided to the compute indicates that that the attribute was defined by the Maya parent node, the compute method should return MS::kUnknownParameter. When this occurs, Maya will call the internal Maya node from which the user-defined node is derived to compute the plug's value.

This means that a user defined node does not need to be concerned with computing inherited output attributes. However, if desired, these can be safely recomputed by this method to change the behaviour of the node.

Parameters

[in]	plug	plug representing the attribute that needs to be recomputed
[in]	dataBlock	data block containing storage for the node's attributes

Returns: Status code

Status Codes:

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

Reimplemented from MPxEmitterNode.

Examples:: simpleFluidEmitter/simpleFluidEmitter.h.

MStatus fluidEmitter	(	const MObject &	fluidObj,
		const MMatrix &	worldMatrix,
		int	plugIndex
	)

virtual

This is the main method that plug-in fluid emitter nodes must override in order to emit into fluids.

When an emitter is attached to a fluid, at every evaluation step the fluid will call this method on the emitter. The method receives a fluid object into which to emit, the index of the fluid in the array of fluid targets for this emitter, and the worldspace matrix of the fluid. The emitter should query its attributes to determine how much density, heat, color, and/or fuel to emit into the fluid, then call the MFnFluid::emitIntoArrays() method to actually add the necessary quantities to the fluid.

Returning MS::kUnknownParameter from this method will cause Maya to execute the default fluid emitter's emission behavior.

Parameters

[in]	fluidObj	the fluid object into which the emitter is emitting.
[in]	worldMatrix	object to world transformation matrix for the fluid
[in]	plugIndex	the index of the fluid in the array of emission targets for this emitter. Pass this value to the random number stream generation routines in MPxEmitterNode.

Returns: Status code

Status Codes:

MS::kSuccess Return kSuccess to indicate that the plug-in node successfully performed the emission step.
MS::kUnknownParameter Return kUnknownParameter to tell Maya to execute the standard internal fluid emitter behavior for this time step.

Examples:: simpleFluidEmitter/simpleFluidEmitter.h.

double fluidDensityEmission ( MDataBlock & block )

Intended to be called from within the emitter's compute() method, this method retrieves the "fluidDensityEmission" attribute value common to all fluid emitters.

This indicates the amount of fluid material to be emitted per second, and it is modulated by the emitter's "rate" attribute value.

Parameters