It turns out my approach was flawed. I wanted to get the expression so
that I could remove it and replace it. However, since it doesn't exist
until the termination of the script, I have just attached my own expression
during script run time. Maya never has a chance to connect it's own.
Problem solved. (I suppose, there never really was a problem.
Problem...uninvented?)
On Tuesday, October 1, 2013 9:59:12 AM UTC-7, Mark Dietel wrote:
>
> Hey guys,
>
> This post isn't python specific, so forgive me if it's misplaced.
>
> I'm having some trouble interacting with an imagePlane after enabling the
> "useFrameExtension" attribute. Once this attribute is enabled, there should
> be an expression connected to the imagePlane node. I want to delete that
> expression in order to create my own key frames. The problem is that when
> I script these actions the expression doesn't get created until Maya
> regains control from the script.
>
> For example, if I run this script;
>
> imagePlaneName = "imagePlane1" # assuming this has already been created
> cmds.setAttr( "%s.useFrameExtension" % imagePlaneName, 1 )
> connected_expressions = cmds.listConnections("%s.frameExtension" %
> imagePlaneName, source=True, destination=False)
>
> connected_expressions will be empty.
>
> I've tried sleeping the script and looping over the listConnections like
> this
>
> cmds.setAttr( "%s.useFrameExtension" % imagePlaneName, 1 )
>
> while not connected_expressions:
> connected_expressions = cmds.listConnections("%s.frameExtension" %
> imagePlaneName, source=True, destination=False)
> time.sleep(1)
>
>
> ...but neither seems to allow Maya to create the expression. The only
> thing that seems to work is to stop the script entirely and give control
> back to Maya. Like this;
>
> cmds.setAttr( "%s.useFrameExtension" % imagePlaneName, 1 )
> STOP THE SCRIPT
> connected_expressions = cmds.listConnections("%s.frameExtension" %
> imagePlaneName, source=True, destination=False)
>
> In this final case, the connected_expressions variable will contain a list
> of at least one expression. The one I need.
>
> How can I delay my script or force Maya to continue the expression
> creation so that I can act on the expression?
>
>
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