On Thursday, June 20, 2019 at 2:43:28 AM UTC+2, yann19 wrote:
> I am trying to query for the default expression used in the imagePlane with
> the following code:
>
>
>
>
>
> # Part01
> img = cmds.imagePlane()
> frame_ext_attr = "{0}.useFrameExtension".format(img[0])
> cmds.setAttr(frame_ext_attr, True)
>
>
> # Part02
> print '>>> ', cmds.listConnections("{0}.frameExtension".format(img[0]))
> If I am running the above code block as a whole, the return result in
> `Part02` is `None`.
> However, if I run them in 2 parts, `Part02` will then be returning me
> `['expression1']` as the result.
>
>
> Why are there 2 different results?
>
>
> I have tried using some mel-based commands such as `refreshAE` or `updateAE
> <node path>`, in hope that the (whole) code block will be able to capture the
> expression in the first run, but it is not.
>
>
> Any ideas?
It's likely that since this creates the expression on an attribute change that
only in the next "idle" state or upon a certain event post-process the
expression gets added by Maya.
Unfortunately I've found no way to actually make this process correctly. Here's
some things I quickly tried:
(Somehow I'm not getting the WYSIWYG editor, so I'm not sure code formatting
will work)
[CODE]
import maya.mel
from PySide2 import QtWidgets
import time
# Part01
img = cmds.imagePlane()
frame_ext_attr = "{0}.useFrameExtension".format(img[0])
cmds.setAttr(frame_ext_attr, True)
# Force update? (tests)
for x in range(2):
# Run twice so "any order" of commands after each other
# is run and tested.
QtWidgets.QApplication.instance().processEvents()
cmds.refresh(force=True)
maya.utils.processIdleEvents()
maya.mel.eval("refreshAE;")
maya.mel.eval("updateMainWindowComponentState();")
time.sleep(0.05)
# Part02
print '>>> ', cmds.listConnections("{0}.frameExtension".format(img[1]))
[/CODE]
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