pymel.core.modeling.detachCurve¶

detachCurve(*args, **kwargs)¶

The detachCurve command detaches a curve into pieces, given a list of parameter values. You can also specify which pieces to keep and which to discard using the -kflag. The names of the newly detached curve(s) is returned. If history is on, then the name of the resulting dependency node is also returned. You can use this command to open a periodic curve at a particular parameter value. You would use this command with only one -pflag. If you are specifying -kflags, then you must specify one, none or all -kflags. If you are specifying all -kflags, there must be one more -kflag than -pflags.

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.
frozen / fzn		bool
keep / k		bool
	Whether or not to keep a detached piece. This multi attribute should be one element larger than the parameter multi attribute. 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.
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.
parameter / p		float
	Parameter values to detach at Default:0.0 Common flags
replaceOriginal / rpo		bool
	Create in place(i.e., replace). Flag can have multiple arguments, passed either as a tuple or a list.

Derived from mel command maya.cmds.detachCurve

Example:

import pymel.core as pm

pm.detachCurve( 'curve1', ch=True, p=0.2, replaceOriginal=False )
# Detaches curve1 at parameter value 0.2.  The
# result is two curves and a detachCurve dependency node.
# The "-rpo" flag specifies that the original curve is not to be
# replaced; as a result a new curve is created for each curve piece.
# Note that if "k" flag is not used, then the default is that
# all pieces are kept.

pm.detachCurve( 'curve1.ep[1]', ch=True, replaceOriginal=False )
# Detaches curve1 at its second edit point.

pm.detachCurve( 'curve1.u[0.2]', ch=True, replaceOriginal=False )
# Detaches curve1 at parameter value 0.2

pm.detachCurve( 'curve1', ch=True, p=0.4, k=(1 , 0), rpo=False )
# Detaches curve1 at parameter value 0.4 into two curves.  Because of
# the "k" flags, two curves are created, but the second one is empty.
# A detachCurve dependency node is also returned.

pm.detachCurve( 'curve1', ch=True, p=(0.2, 0.4), rpo=True )
# Detaches curve1 into three pieces.  Because the "rpo" flag is on,
# the original curve is replaced with the first piece.  The names
# of all curve pieces are returned.  If curve1 is a result of history,
# then a dependency node is created and its output is connected as
# the input to curve1.  If curve1 is not a result of construction
# history, then a dependency node is not created (even though the
# "ch" flag is on).

pm.detachCurve( 'circle1', ch=True, p=(0.2, 0.4) )
# Detaches a periodic curve, circle1, at two places.  Before
# the detach, the circle is periodic, with a start parameter of 0.0,
# and an end parameter of 8.0.
# The first parameter, 0.2, is used to move the start point of the curve,
# also called the "seam".  The second parameter, 0.4, is used to perform
# a detach operation.  The result is TWO curves only.  The first curve
# has a parameter range of 0.2 to 0.4.  The second curve has a parameter
# range of 0.4 to 8.2.