Forums Technical Discussion Undo group problem

Undo group problem

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jerry7
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689 posts
Joined: Nov. 2013
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In the shelf tool, throwing an exception does not modify the scene. I want to implement this functionality in the Python panel.
This code works normally. 

try:
    with hou.undos.group("my code"):
        hou.node('/obj/geo1').createNode('box')
        hou.node('/obj/geo1').createNode('box')
        raise hou.Error()
except:
        hou.undos.performUndo()


However, if an error occurs before modifying the scene, the current undo group is not recorded in the undo history. The undo executed in the except block will cancel the previous operation.

try:
    with hou.undos.group("my code"):
        raise hou.Error() # raise exception before modifying scene , no undo is added to undo history.
        hou.node('/obj/geo1').createNode('box')
        hou.node('/obj/geo1').createNode('box')
                
except:
        hou.undos.performUndo() # undo operation before my code

How to solve this problem?

Thanks!
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