OpenMaya.MPxNode Class Reference
Base class for user defined dependency nodes.
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int | kAssembly = 22 |
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int | kBlendShape = 25 |
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int | kCameraSetNode = 16 |
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int | kClientDeviceNode = 20 |
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int | kConstraintNode = 17 |
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int | kDeformerNode = 2 |
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int | kDependNode = 0 |
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int | kEmitterNode = 6 |
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int | kFieldNode = 5 |
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int | kFluidEmitterNode = 13 |
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int | kGeometryFilter = 24 |
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int | kHardwareShader = 9 |
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int | kHwShaderNode = 10 |
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int | kIkSolverNode = 8 |
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int | kImagePlaneNode = 14 |
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int | kLast = 26 |
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int | kLocatorNode = 1 |
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int | kManipContainer = 3 |
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int | kManipulatorNode = 18 |
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int | kMotionPathNode = 19 |
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int | kObjectSet = 12 |
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int | kParticleAttributeMapperNode = 15 |
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int | kSkinCluster = 23 |
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int | kSpringNode = 7 |
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int | kSurfaceShape = 4 |
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int | kThreadedDeviceNode = 21 |
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int | kTransformNode = 11 |
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| OpenMaya.MPxNode.__init__ |
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x.__init__(...) initializes x; see help(type(x)) for signature
| OpenMaya.MPxNode.addAttribute |
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addAttribute(attr) -> None
This method adds a new attribute to a user defined node type during the type's initialization.
This method will only work during the static initialization method of the user defined node class. The initialization method is the one that is passed into MFnPlugin.registerNode(). The attributes must first be created using one of the MFnAttribute classes, and can then be added using this method.
For compound attributes, the proper way to use this method is by calling it with the parent attribute. If a compound attribute is passed, this method will add all of its children.
NOTE: A failure will occur if you attempt to call addAttribute() on the children of a compound attribute.
* attr (MObject) - new attribute to add.
| OpenMaya.MPxNode.addExternalContentForFileAttr |
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addExternalContentForFileAttr(table, attr) -> bool
This method is a helper for derived clases implementing getExternalContent(). It augments the external content info table passed in with an entry describing external content whose location is described by the specified attribute.
The method will not overwrite existing items, i.e. items with the same key. (attribute name). In this context, overwriting an item means the caller has called this function twice with the same attribute, or that two separate but identically named attributes were used. If replacing an entry is the desired effect, it is the caller's responsibility to erase the previous item first.
* table [OUT] (MExternalContentInfoTable) - table The table in which the new entry will be added.
* attr (MObject) - The attribute for which the plug value will be queried for a location.
Returns True if an item was sucessfully added to the table. False if the attribute does not describe a non-empty location, or an item with the same key was already present in the table.
| OpenMaya.MPxNode.attributeAffects |
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attributeAffects(whenChanges, isAffected) -> None
This method specifies that a particular input attribute affects a specific output attribute. This is required to make evaluation efficient. When an input changes, only the affected outputs will be computed. Output attributes cannot be keyable - if they are keyable, this method will fail.
This method must be called for every attribute dependency when initializing the node's attributes. The attributes must first be added using the MPxNode.addAttribute() method. Failing to call this method will cause the node not to update when its inputs change. If there are no calls to this method in a node's initialization, then the compute method will never be called.
This method will only work during the static initialization method of the user defined node class. The initialization method is the one that is passed into MFnPlugin.registerNode(). As a result, it does not work with dynamic attributes. For an alternate solution which handles dynamic as well as non-dynamic attributes refer to MPxNode.setDependentsDirty.()
* whenChanges (MObject) - input attribute - MObject that points to an input attribute that has already been added.
* isAffected (MObject) - affected output attribute - MObject that points to an output attribute that has already been added.
| OpenMaya.MPxNode.compute |
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compute(plug, dataBlock) -> self
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 None. 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.
* plug (MPlug) - plug representing the attribute that needs to be recomputed.
* block (MDataBlock) - data block containing storage for the node's attributes.
| OpenMaya.MPxNode.connectionBroken |
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connectionBroken( plug, otherPlug, asSrc) -> self
This method gets called when connections are broken with attributes of this node.
* plug (MPlug) - attribute on this node.
* otherPlug (MPlug) - attribute on other node.
* asSrc (bool) - is this plug a source of the connection.
| OpenMaya.MPxNode.connectionMade |
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connectionMade(plug, otherPlug, asSrc) -> self
This method gets called when connections are made to attributes of this node.
* plug (MPlug) - attribute on this node.
* otherPlug (MPlug) - attribute on other node.
* asSrc (bool) - is this plug a source of the connection.
| OpenMaya.MPxNode.copyInternalData |
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copyInternalData(node) -> self
This method is overriden by nodes that store attribute data in some internal format.
On duplication this method is called on the duplicated node with the node being duplicated passed as the parameter. Overriding this method gives your node a chance to duplicate any internal data you've been storing and manipulating outside of normal attribute data.
* node (MPxNode) - the node that is being duplicated.
| OpenMaya.MPxNode.dependsOn |
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dependsOn( plug, otherPlug) -> bool/None
This method may be overridden by the user defined node. It should only be required to override this on rare occasions.
This method determines whether a specific attribute depends on another attribute.
You should return None to specify that Maya should determines the dependency (default).
This is mainly to define dependency of dynamic attributes, since attributeAffects does not work with dynamic attributes.
* plug (MPlug) - attribute on this node.
* otherPlug (MPlug) - attribute on other node.
| OpenMaya.MPxNode.doNotWrite |
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doNotWrite() -> bool
use this method to query the "do not write" state of this proxy node. True is returned if this node will not be saved when the maya model is written out.
| OpenMaya.MPxNode.forceCache |
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forceCache(ctx=fsNormal) -> MDataBlock
Get the datablock for this node. If there is no datablock then one will be created.
NOTE: This should be used only in places where fast access to the datablock outside of a compute is critical such as the transformUsing method of MPxSurfaceShape.
* ctx (MDGContext) - The context in which the node will evaluate.
| OpenMaya.MPxNode.getExternalContent |
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getExternalContent(table) -> self
The table populated by this method must include the location of all the content (files) used by this node, including those that do not exist. See MExternalContentInfoTable for details.
Keys used to add items to this table will be the same that get passed to setExternalContent through its MExternalContentLocationTable parameter to perform a batched change of content location.
When implementing getExternalContent, you are responsible for forwarding the call to the base class when it makes sense to do so, so that base classes can also add their external content to the table.
The default implementation does nothing.
* table [OUT] (MExternalContentInfoTable) - Content information table that this method must populate.
| OpenMaya.MPxNode.getFilesToArchive |
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getFilesToArchive(shortName=False, unresolvedName=False, markCouldBeImageSequence=False) -> list of strings
Use this method to return all external files used by this node. This file list will be used by the File > Archive zip feature, maya.exe -archive and the `file -q -list` mel command.
Only include files that exist.
If shortName is True, return just the filename portion of the path. Otherwise, return a full path.
If unresolvedName is True, return the path before any resolution has been done (i.e leave it as a relative path, include unexpanded environment variables, tildes, ".."s etc). Otherwise, resolve the file path and return an absolute path (to resolve with standard Maya path resolution, use MFileObject.resolvedFullName()).
* shortName (bool) - If True, only add the filename of the path.
* unresolvedName (bool) - If True, add paths before any resolution, rather than absolute paths.
* markCouldBeImageSequence (bool) - If True, append an asterisk after any file path that could be an image sequence (note: only used by maya.exe -archive).
| OpenMaya.MPxNode.getInternalValueInContext |
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getInternalValueInContext(plug, dataHandle, ctx) -> bool
This method is overriden by nodes that store attribute data in some internal format.
The internal state of attributes can be set or queried using the setInternal and internal methods of MFnAttribute.
When internal attribute values are queried via getAttr or MPlug.getValue() this method is called.
* plug (MPlug) - the attribute that is being queried.
* dataHandle [OUT] (MDataHandle) - the dataHandle to store the attribute value.
* ctx (MDGContext) - the context the method is being evaluated in.
| OpenMaya.MPxNode.inheritAttributesFrom |
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inheritAttributesFrom(parentClassName) -> None
This method allows a class of plugin node to inherit all of the attributes of a second class of plugin node.
This method will only work during the static initialization method of the user defined node class and must be called before any other attributes have been added. The initialization method is the one that is passed into MFnPlugin.registerNode().
A plugin node may only inherit attributes from one other class of plugin node. Attempting to call this method multiple times within a node's initialization method will result in an error.
Both node classes must be registered using the same MPxNode type, listed in MPxNode.type().
* parentClassName (string) - class of node to inherit attributes from.
| OpenMaya.MPxNode.internalArrayCount |
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internalArrayCount(plug, ctx) -> int
This method is overriden by nodes that have internal array attributes which are not stored in Maya's datablock. This method is used by Maya to determine the non-sparse count of array elements during file io. If the internal array is stored sparsely, you should return the maximum index of the array plus one. If the internal array is non-sparse then return the length of the array.
This method does not need to be implemented for attributes that are stored in the datablock since Maya will use the datablock size.
If this method is overriden, it should return -1 for attributes which it does not handle. Maya will use the datablock size to determine the array length when -1 is returned.
* plug (MPlug) - the array plug.
* ctx (MDGContext) - the context.
| OpenMaya.MPxNode.isAbstractClass |
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isAbstractClass() -> bool
Override this class to return True if this node is an abstract node. An abstract node can only be used as a base class. It cannot be created using the 'createNode' command.
It is not necessary to override this method.
| OpenMaya.MPxNode.isPassiveOutput |
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isPassiveOutput(plug) -> bool
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. For example, output plugs on animation curve nodes are passive. This allows the attributes driven by the animation curves to be set to new values by the user.
* plug (MPlug) - plug representing output in question.
| OpenMaya.MPxNode.legalConnection |
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legalConnection(plug, otherPlug, asSrc) -> bool/None
This method allows you to check for legal connections being made to attributes of this node.
You should return None to specify that maya should handle this connection if you are unable to determine if it is legal.
* plug (MPlug) - attribute on this node.
* otherPlug (MPlug) - attribute on other node.
* asSrc (bool) - is this plug a source of the connection.
| OpenMaya.MPxNode.legalDisconnection |
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legalDisconnection(plug, otherPlug, arsSrc) -> bool/None
This method allows you to check for legal disconnections being made to attributes of this node.
You should return None to specify that maya should handle this disconnection if you are unable to determine if it is legal.
* plug (MPlug) - attribute on this node.
* otherPlug (MPlug) - attribute on other node.
* asSrc (boool) - is this plug a source of the connection.
| OpenMaya.MPxNode.name |
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name() -> string
Returns the name of this particular instance of this class. Each objectin the dependency graph has a name. This name will be used by the UIand by MEL.
It is not necessary to override this method.
Returns the name of the node
| OpenMaya.MPxNode.passThroughToMany |
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passThroughToMany(plug, plugArray) -> bool
This method is overriden 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. In particular, the Artisan paint code uses this method when searching for paintable nodes, and the disk cache code uses this method when searching for upstream cacheFile nodes.
If this method is not implemented or returns False, the base class Maya implementation of this method calls passThroughToOne and returns the results of that call.
* plug (MPlug) - the plug.
* plugArray (MPlugArray) - the corresponding plugs.
| OpenMaya.MPxNode.passThroughToOne |
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passThroughToOne(plug) -> plug
This method may be overriden by nodes that have a one-to-one relationship between an input attribute and a corresponding output attribute. This method is used by Maya to perform the following capabilities:
- When this node is deleted, the delete command will rewire the source of the input attribute to the destination of the output attribute if the source and destination are connected to nodes that are not deleted.
- History traversal algorithms such as the bakePartialHistory command use this method to direct its traversal through a shape's construction history.
- The base class Maya implementation of passThroughToAll will call this method if passThroughToAll returns False.
* plug (MPlug) - the plug.
| OpenMaya.MPxNode.postConstructor |
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postConstructor() -> self
Internally maya creates two objects when a user defined node is created, the internal MObject and the user derived object.
The association between the these two objects is not made until after the MPxNode constructor is called. This implies that no MPxNode member function can be called from the MPxNode constructor.
The postConstructor will get called immediately after the constructor when it is safe to call any MPxNode member function.
| OpenMaya.MPxNode.setDependentsDirty |
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setDependentsDirty(plug, plugArray) -> self
This method can be overridden in user defined nodes to specify which plugs should be set dirty based upon an input plug which Maya is marking dirty. The list of plugs for Maya to mark dirty is returned by the plug array. This method handles both dynamic as well as non-dynamic plugs and is useful in the following ways:
- Allows attributeAffects-style relationships to be handled for dynamically-added attributes. Since MPxNode.attributeAffects() can only be used with non-dynamic attributes, use of this method allows a way for all attributes of a node to affect one another, both dynamic and non-dynamic.
- Provides more flexible relationships than what is available with MPxNode.attributeAffects(). For example, you may wish to not dirty plugs when the current frame is one. However, as the routine is called during dirty propagation, there are restrictions on what can be done within the routine, most importantly you must not cause any dependency graph computation. For details, see the IMPORTANT NOTE below.
This method is designed to work harmoniously with MPxNode.attributeAffects() on the same node. Alternately, you can do all affects relationships within a yourNode.setDependentsDirty() implementation.
The body of a user-implemented setDependentsDirty() implementation might look like the following example, which causes the plug called "B" to be set dirty whever plug "A" is changed, i.e. A affects B.
* plug (MPlug) - plug which is being set dirty by Maya.
* plugArray the programmer should add any plugs which they want to set dirty to this list.
| OpenMaya.MPxNode.setDoNotWrite |
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setDoNotWrite(bool) -> self
Use this method to mark the "do not write" state of this proxy node. If set, this node will not be saved when the Maya model is written out.
NOTES:
1. Plug-in "requires" information will be written out with the model when saved. But a subsequent reload and resave of the file will cause these to go away.
2. If this node is a DAG and has a parent or children, the "do not write" flag of the parent or children will not be set. It is the developer's responsibility to ensure that the resulting scene file is capable of being read in without errors due to unwritten nodes.
| OpenMaya.MPxNode.setExternalContent |
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setExternalContent(table) -> self
This is useful in the context of content relocation. This will be called while the scene is being loaded to apply path changes performed externally. Consequently, interaction with the rest of the scene must be kept to a minimum. It is however valid to call this method outside of scene loading contexts.
The keys in the map must be the same as the ones provided by the node in getExternalContent. The values are the new locations.
When implementing setExternalContent, you are responsible for forwarding the call to the base class when it makes sense to do so, so that base classes can also set their external content.
The default implementation does nothing.
* table Key->location table with new content locations.
| OpenMaya.MPxNode.setExternalContentForFileAttr |
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setExternalContentForFileAttr(attr, table) -> bool
This method is a helper for derived clases implementing setExternalContent(). It assigns a value to a plug with the one from the table whose key is the same as the passed in attribute name.
The method will not write to the plug if the attribute is not found in the table.
* attr (MObject) - The attribute of the plug we want to write to.
* table (MExternalContentLocationTable) - A table which may hold or not the value for a given plug.
Returns True if the plug was successfully written to. False if no entry in the table was named after the attribute or if no plug was found.
| OpenMaya.MPxNode.setInternalValueInContext |
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setInternalValueInContext(plug, dataHandle, ctx) -> bool
This method is overriden by nodes that store attribute data in some internal format.
The internal state of attributes can be set or queried using the setInternal and internal methods of MFnAttribute.
When internal attribute values are set via setAttr or MPlug.setValue() this method is called.
Another use for this method is to impose attribute limits.
* plug (MPlug) - the attribute that is being set.
* dataHandle (MDataHandle) - the dataHandle containing the value to set.
* ctx (MDGContext) - the context the method is being evaluated in.
| OpenMaya.MPxNode.setMPSafe |
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setMPSafe(bool) -> self
Set a flag to specify if a user defined shading node is safe for multi-processor rendering. For a shading node to be MP safe, it cannot access any shared global data and should only use attributes in the datablock to get input data and store output data.
This flag does NOT mark a node thread safe for parallel DG evaluation in Viewport 2.0. To mark a node thread safe for parallel DG evaluation see the setNodeTypeFlag mel command.
NOTE: This should be called from the postConstructor() method for shading node plug-ins only. If a shading node is non-safe, then it will only be useful during single processor rendering.
| OpenMaya.MPxNode.shouldSave |
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shouldSave(plug) -> bool/None
This method may be overridden by the user defined node. It should only be required to override this on rare occasions.
This method determines whether a specific attribute of this node should be written out during a file save. The default behavior is to only write the value if it differs from the default and is not being supplied by a connection. This behavior should be sufficient in most cases.
This method is not called for ramp attributes since they should always be written.
* plug (MPlug) - plug representing the attribute to be saved.
| OpenMaya.MPxNode.thisMObject |
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thisMObject() -> MObject
Returns the MObject associated with this user defined node. This makes it possible to use MFnDependencyNode or to construct plugs to this node's attributes.
| OpenMaya.MPxNode.type |
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type() -> int
Returns the type of node that this is. This is used to differentiate user defined nodes that are derived off different MPx base classes.
It is not necessary to override this method.
kDependNode Custom node derived from MPxNode
kLocatorNode Custom locator derived from MPxLocatorNode
kDeformerNode Custom deformer derived from MPxDeformerNode
kManipContainer Custom container derived from MPxManipContainer
kSurfaceShape Custom shape derived from MPxSurfaceShape
kFieldNode Custom field derived from MPxFieldNode
kEmitterNode Custom emitter derived from MPxEmitterNode
kSpringNode Custom spring derived from MPxSpringNode
kIkSolverNode Custom IK solver derived from MPxIkSolverNode
kHardwareShader Custom shader derived from MPxHardwareShader
kHwShaderNode Custom shader derived from MPxHwShaderNode
kTransformNode Custom transform derived from MPxTransform
kObjectSet Custom set derived from MPxObjectSet
kFluidEmitterNode Custom fluid emitter derived from MpxFluidEmitterNode
kImagePlaneNode Custom image plane derived from MPxImagePlane
kParticleAttributeMapperNode Custom particle attribute mapper derived from MPxParticleAttributeMapperNode
kCameraSetNode Custom director derived from MPxCameraSet
kConstraintNode Custom constraint derived from MPxConstraint
kManipulatorNode Custom manipulator derived from MPxManipulatorNode
kClientDeviceNode Custom threaded device derived from MPxThreadedDeviceNode
kThreadedDeviceNode Custom threaded device node
kAssembly Custom assembly derived from MPxAssembly
kSkinCluster Custom deformer derived from MPxSkinCluster
kGeometryFilter Custom deformer derived from MPxGeometryFilter
kBlendShape Custom deformer derived from MPxBlendShape
| OpenMaya.MPxNode.typeId |
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typeId() -> MTypeId
Returns the TYPEID of this node.
| OpenMaya.MPxNode.typeName |
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typeName() -> string
Returns the type name of this node. The type name identifies the node type to the ASCII file format
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