generative modeling for Rhino
In Autocad it is really easy to unfillet or change a radius of a filleted curve. Unfortunately in Rhino this is not possible (or I'm missing something really big here :)).
That's why I've wrote a nifty unfillet script in Grasshopper. As input you can put any polyline that has some or all corners filleted. Warning though, a spline doesn't work, only a polyline that has filleted corners.
P.S. Only works in Rhino v5 and you need python for grasshopper: http://www.food4rhino.com/project/ghpython