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.
Flags:
Long Name / Short Name | Argument Types | Properties | |
---|---|---|---|
caching / cch | bool | ||
constructionHistory / ch | bool | ![]() |
|
|
|||
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.