pymel.core.modeling.arclen¶
- arclen(*args, **kwargs)¶
This command returns the arclength of a curve if the history flag is not set (the default). If the history flag is set, a node is created that can produce the arclength, and is connected and its name returned. Having the construction history option on makes this command useful for expressions.
- Modifications:
- returns a PyNode object for flags: constructionHistory
Flags:
Long Name / Short Name Argument Types Properties caching / cch bool constructionHistory / ch bool Turn the construction history on or off (where applicable). Flag can have multiple arguments, passed either as a tuple or a list. frozen / fzn bool name / n unicode nodeState / nds int Derived from mel command maya.cmds.arclen
Example:
import pymel.core as pm pm.arclen( 'curve1' ) # This command returns a float value that is the length of curve1 in # the current linear units. curveInfoNode = pm.arclen('curve1', ch=True) pm.expression( s= 'surface1.sx = %s.arcLength' % curveInfoNode ) # The first command produces a curve info node for curve1 and returns # the name of the curve info node. The second command shows how the # arc length attribute of the curve info node can be used to set up # an expression, ie. it drives one of the scale factors of surface1. # # Note the expression command still only creates MEL expressions, although they can # be called from Python.