pymel.core.modeling.extendCurve¶

extendCurve(*args, **kwargs)¶

This command extends a curve or creates a new curve as an extension

Flags:

Long Name / Short Name		Argument Types	Properties
caching / cch		bool
	Toggle caching for all attributes so that no recomputation is needed
constructionHistory / ch		bool
	Turn the construction history on or off.
curveOnSurface / cos		bool
	If possible, create 2D curve as a result.
distance / d		float
	The distance to extend Used only for extendMethod is byDistance. Default:1
extendMethod / em		int
	The method with which to extend: 0 - based on distance, 2 - to a 3D point Default:0
extensionType / et		int
	The type of extension: 0 - linear, 1 - circular, 2 - extrapolate Default:0
frozen / fzn		bool
inputPoint / ip		float, float, float
	The point to extend to (optional)
join / jn		bool
	If true, join the extension to original curve Default:true
name / n		unicode
	Sets the name of the newly-created node. If it contains namespace path, the new node will be created under the specified namespace; if the namespace does not exist, it will be created.
noChanges / nc		bool
	If set then the operation node will be automatically put into pass-through mode.
nodeState / nds		int
	Maya dependency nodes have 6 possible states. The Normal (0), HasNoEffect (1), and Blocking (2)states can be used to alter how the graph is evaluated. The Waiting-Normal (3), Waiting-HasNoEffect (4), Waiting-Blocking (5)are for internal use only. They temporarily shut off parts of the graph during interaction (e.g., manipulation). The understanding is that once the operation is done, the state will be reset appropriately, e.g. Waiting-Blockingwill reset back to Blocking. The Normaland Blockingcases apply to all nodes, while HasNoEffectis node specific; many nodes do not support this option. Plug-ins store state in the MPxNode::stateattribute. Anyone can set it or check this attribute. Additional details about each of these 3 states follow. StateDescriptionNormalThe normal node state. This is the default.HasNoEffectThe HasNoEffectoption (a.k.a. pass-through), is used in cases where there is an operation on an input producing an output of the same data type. Nearly all deformers support this state, as do a few other nodes. As stated earlier, it is not supported by all nodes. Its typical to implement support for the HasNoEffectstate in the nodes compute method and to perform appropriate operations. Plug-ins can also support HasNoEffect. The usual implementation of this state is to copy the input directly to the matching output without applying the algorithm in the node. For deformers, applying this state leaves the input geometry undeformed on the output. BlockingThis is implemented in the depend node base class and applies to all nodes. Blockingis applied during the evaluation phase to connections. An evaluation request to a blocked connection will return as failures, causing the destination plug to retain its current value. Dirty propagation is indirectly affected by this state since blocked connections are never cleaned. When a node is set to Blockingthe behavior is supposed to be the same as if all outgoing connections were broken. As long as nobody requests evaluation of the blocked node directly it wont evaluate after that. Note that a blocked node will still respond to getAttrrequests but a getAttron a downstream node will not reevaluate the blocked node. Setting the root transform of a hierarchy to Blockingwont automatically influence child transforms in the hierarchy. To do this, youd need to explicitly set all child nodes to the Blockingstate. For example, to set all child transforms to Blocking, you could use the following script. import maya.cmds as cmds def blockTree(root): nodesToBlock = [] for node in {child:1 for child in cmds.listRelatives( root, path=True, allDescendents=True )}.keys(): nodesToBlock += cmds.listConnections(node, source=True, destination=True ) for node in {source:1 for source in nodesToBlock}.keys(): cmds.setAttr( ‘%s.nodeState’ % node, 2 ) Applying this script would continue to draw objects but things would not be animated. Default:kdnNormal
object / o		bool
	Create the result, or just the dependency node.
pointX / px		float
	X of the point to extend to Default:0
pointY / py		float
	Y of the point to extend to Default:0
pointZ / pz		float
	Z of the point to extend to Default:0
range / rn		bool
	Force a curve range on complete input curve.
removeMultipleKnots / rmk		bool
	If true remove multiple knots at join Used only if join is true. Default:false
replaceOriginal / rpo		bool
	Create in place(i.e., replace). Flag can have multiple arguments, passed either as a tuple or a list.
start / s		int
	Which end of the curve to extend. 0 - end, 1 - start, 2 - both Default:1 Common flags

Derived from mel command maya.cmds.extendCurve

Example:

import pymel.core as pm

# to extend the start of a curve with a line of distance 3
pm.extendCurve( em=0, et=0, s=True, d=3.0 )

# to extend the end of a curve to a point
pm.extendCurve( em=2, s=False, ip=(1, 2, 3) )