Hi Ken, there is a limited history function, if you create a surface from something like extrude, sweep, or revolve, if you then edit the input curves that went into that surface the surface will update.
But once you do certain operations like booleans, the "history chain" will be broken and you won't be able to do that kind of edit after that.
In the future I do want to make the history function deeper to handle this kind of stuff, but it's a pretty complex piece of work to implement that well since it involves storing a whole lot of previous versions of objects and that can make for a lot of data to process.
Usually in MoI the main way to change things later on is to just redraw things. MoI is sort of based around the idea that it's quick to draw things so this is often not such a big deal.
But if you really need to make that kind of deep history edit you would probably be better off doing those models in solidworks rather than in MoI.
MoI is not really designed as a "drop in" replacement for solidworks really, MoI is more focused on having a lightweight feel and making drawing things happen in a quick and fluid way so it's more about kind of quick sketching things and not so much about making large parametrically driven assemblies.
- Michael
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