You can make that in Moi ! ; (before maybe some deformations's cage or other marvelous things! ;)
But all surfaces must be Separated : moving tweaking points can be on several surfaces on the same time!
So for a cube don't move it's edges if you want keep it as a solid when you Join surfaces at the end of tweaking!
![](http://moiscript.weebly.com/uploads/3/9/3/8/3938813/gif-modelize_orig.gif)
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