Hi ycarry - MoI does not currently have a "Move face" command like the one in Rhino that you are talking about.
If you are already familiar with that one in Rhino, then one easy solution is for you to use Copy/Paste to move the object into Rhino, use the tool that you are accustomed to over there, and then Copy/Paste back into MoI.
Otherwise there are a few different methods you can use the result that you want in MoI.
Probably the most simple is to select the bottom face, and use Extrude by the distance that you want to move it. Now you have a small solid cylinder nested inside of the larger one - to finish the model select both cylinders (the outside one and the new nested inside one) and run Construct / Boolean / Union, which will merge those 2 pieces together into one new piece and you're done. If you want to move it downards, then extrude downwards and use Boolean Difference instead.
Another method is to select the bottom cap and inside wall surfaces, and use Edit/Separate to break them out into a separate object. Now you can use Transform / Scale / Scale1D to scale the height of that fragment, pick a point on the top level as the origin for the scale. When you are done, select that inside piece and the outside piece and use Edit/Join to glue them back together into a solid.
Then the other method is to also use Edit/Separate to break the interior wall out into its own surface. Then turn on control points, and select the bottom row of control points and move them up. This one is more like what the Move Face command in Rhino does for you behind the scenes.
Even another method is mentioned by Pilou - separate out the bottom cap so it is an individual object, move it up to where you want, then delete the interior side wall and loft between the edges to form a new interior wall (or trim the old interior wall by the bottom cap in its new location) and use Edit/Join to glue the pieces together.
But anyway, the Extrude + Boolean is maybe the easiest.
- Michael
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