Undo take 2 and here is how to do it
A processing system for 3D triangular meshes
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#74 Undo take 2 and here is how to do it
So about this thing:
http://sourceforge.net/apps/mediawiki/meshlab/index.php?title=Projects#UNDO_.28.2A.2A.2A.29
In no way do you have to know exactly what each filters are doing. This is like overkill for an undo feature in this type of software.
What you need to do is save the state or some sort of differential of the object in memory and revert to it. Yes it takes a lot of ressources to do that but we are not running this on a computer made by radio shack in the 90s and beside, if it creates issues to lower end machines, it would be possible to allow disabling the feature.
This sadistic no undo button thing has to end! :P