pymel.core.modeling.alignCurve¶

alignCurve(*args, **kwargs)¶

The curve align command is used to align curves in maya. The main alignment options are positional, tangent and curvature continuity. Curvature continuity implies tangent continuity. Positional continuity means the curves (move) or the ends of the curves (modify) are changed. Tangent continuity means one of the curves is modified to be tangent at the points where they meet. Curvature continuity means one of the curves is modified to be curvature continuous as well as tangent. The default behaviour, when no curves or flags are passed, is to only do positional and tangent continuity on the active list with the end of the first curve and the start of the other curve used for alignment.

Flags:

Long Name / Short Name		Argument Types	Properties
attach / at		bool
	True if the curve is to be attached
caching / cch		bool
	Toggle caching for all attributes so that no recomputation is needed
constructionHistory / ch		bool
	Turn the construction history on or off.
curvatureContinuity / cc		bool
	Curvature continuity is on if true and off otherwise. Default:false
curvatureScale1 / cs1		float
	Curvature scale applied to curvature of first curve for curvature continuity. Default:0.0
curvatureScale2 / cs2		float
	Curvature scale applied to curvature of second curve for curvature continuity. Default:0.0
frozen / fzn		bool
joinParameter / jnp		float
	Parameter on reference curve where modified curve is to be aligned to. Default:123456.0
keepMultipleKnots / kmk		bool
	True if multiple knots should be left as-is.
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.
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.
positionalContinuity / pc		bool
	Positional continuity is on if true and off otherwise. Default:true
positionalContinuityType / pct		int
	Positional continuity type legal values: 1 - move first curve, 2 - move second curve, 3 - move both curves, 4 - modify first curve, 5 - modify second curve, 6 - modify both curves Default:1
replaceOriginal / rpo		bool
	Create in place(i.e., replace). Flag can have multiple arguments, passed either as a tuple or a list.
reverse1 / rv1		bool
	If true, reverse the first input curve before doing align. Otherwise, do nothing to the first input curve before aligning. NOTE: setting this attribute to random values will cause unpredictable results and is not supported. Default:false
reverse2 / rv2		bool
	If true, reverse the second input curve before doing align. Otherwise, do nothing to the second input curve before aligning. NOTE: setting this attribute to random values will cause unpredictable results and is not supported. Default:false
tangentContinuity / tc		bool
	Tangent continuity is on if true and off otherwise. Default:true
tangentContinuityType / tct		int
	Tangent continuity type legal values: 1 - do tangent continuity on first curve, 2 - do tangent continuity on second curve Default:1
tangentScale1 / ts1		float
	Tangent scale applied to tangent of first curve for tangent continuity. Default:1.0
tangentScale2 / ts2		float
	Tangent scale applied to tangent of second curve for tangent continuity. Default:1.0 Common flags

Derived from mel command maya.cmds.alignCurve

Example:

import pymel.core as pm

# Do modify positional continuity on both curves with no history:
pm.alignCurve( ch=False, pc=True, pct=6 )

# Do positional and tangent continuity, with the second curve
# tangent modified (by default move position continuity is done
# on the first curve):
pm.alignCurve( tc=True, tct=2 )