pymel.core.modeling.detachSurface¶

detachSurface(*args, **kwargs)¶

The detachSurface command detaches a surface into pieces, given a list of parameter values and a direction. You can also specify which pieces to keep and which to discard using the -kflag. The names of the newly detached surface(s) are returned. If history is on, the name of the resulting dependency node is also returned. You can only detach in either U or V (not both) with a single detachSurface operation. You can use this command to open a closed surface 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.
direction / d		int
	Direction in which to detach: 0 - V direction, 1 - U direction Default:1
frozen / fzn		bool
keep / k		bool
	Keep the detached pieces. 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 at which to detach. 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.detachSurface

Example:

import pymel.core as pm

pm.detachSurface( 'surface1', ch=True, d=1, p=0.3, rpo=False )
pm.detachSurface( 'surface1.u[0.3]', ch=True )
# Detaches surface1 into two pieces at u = 0.3.
# The results are two surface pieces, and a detachSurface dependency node.
# Since no "-keep" flag is used, all pieces are kept.

pm.detachSurface( 'surface1', ch=True, k=(1,0), rpo=False, p=0.34, d=0 )
pm.detachSurface( 'surface1.v[0.34]', ch=True, k=(1,0), rpo=False )
# Detaches surface1 at v = 0.34.  Because of the "k" flags, two
# surfaces are created but the second surface is empty.  A
# detachSurface dependency node is also returned.

pm.detachSurface( 'surface1', ch=True, rpo=True, p=(0.2, 0.5), d=1 )
pm.detachSurface( 'surface1.u[0.2]', 'surface1.u[0.5]', ch=True, rpo=True )
# Detaches surface1 into three pieces.  Because of the "-rpo" flag,
# the first surface piece is used to replace the original surface1.
# The results are the three surfaces (including the original surface).
# Even though the "ch" flag is on, a dependency node is not created
# if surface1 is not a result of construction history.  If surface1
# is the result of construction history, then a dependency node is
# created and its name is returned.

pm.detachSurface( 'cylinder1', ch=True, d=0, p=0.3, rpo=False )
# Detaches cylinder1, which is periodic in V, where the V parameter
# ranges between 0.0 and 8.0.  The parameter, 0.3, is used to move
# the start point of the cylinder, also known as the "seam".
# The resulting surface's V parameter range is 0.0 to 0.3.

pm.detachSurface( 'cylinder1', ch=True, d=0, p=(0.3, 0.7), rpo=False )
# Detaches cylinder1, which is periodic in V, where the V parameter
# ranges between 0.0 and 8.0.  The 1st parameter, 0.3, is used to move
# the start point of the cylinder, also known as the "seam".
# The second parameter, 0.7, is used to detach the cylinder again.
# The result is only TWO surfaces; the first surface's V parameter ranges
# from 0.0 to 0.3. The second surface's V parameter ranges from 0.3 to 0.7.