I am trying Meshlab, but immediately hit an issue with the apparent lack of an 'Undo" command after trying a cleanup transformation that had undesired results.
As a (less than ideal) workaround I tried the 'reload' function, which simply displayed the object again in its transformed state, even though at no time had I saved the object in that state.
If I restart Meshlab then load the object again, only then does it show in its original state. Not sure if this is a single issue or two issues (one of which being a bug) - but either way, how can I achieve effective 'Undo' functionality? that would allow me to try a transformation without having to quit and restart Meshlab after every unsuccessful result?
Answer
Unfortunately there is no Undo feature in MeshLab (a longstanding gripe).
The Reload button should reload the mesh from the source file (although I have found that it doesn't reload textures). If this is not working for you then it sounds like a bug that you should report.
The only other workaround I can recommend is to duplicate your mesh before running any potentially destructive filters; if the results are undesirable you can delete the duplicate and try again.