For the most part when writing a plug-in you have to specifically tell Maya how to undo something. For example given a node named "mySphere" is renamed to "yourSphere" (passed as an argument). Then the undo function will rename "yourSphere" back to "mySphere". When you undo, Maya is in the exact state as the doIt/redoIt, so you can assume what you did can be reversed using the same varaibles that are stored globally to the MPxCommand.
The MGlobal class has a method to execute MEL and Python command that 'can' undo. I just used it to create a skinCluster since its easier the create a skinCluster using MEL or Python then the Maya API.
You don't have to compile Python plug-ins for them to run. Check out the examples in the dev kit, in the scripted folder.
-brian
www.meljunky.com
-------- Original Message --------
Subject: [Maya-Python] Undo/Redo
From: Brandon Harris <[email protected]>
Date: Thu, October 15, 2009 5:20 pm
To: python_inside_maya <[email protected]>
OK. So I have finished a small procedure for averaging weights on
components and I have come to a point where I would like to set it up
for undoing and redoing. The only information I have to describe how
it's done is with Complete Maya Programming, but in it, all of it is
written in C++ and it's written as a compiled plugin. So my question
is, what changes about that with this all being in Python and run as a
script rather than a plugin?
Would I need to convert my procedure into an object and have the
undoIt and redoIt methods, or do I need to build the whole thing up as
MPxCommand and run it as a plugin? Any information would be great!
thanks!
Brandon L. Harris
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