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Breaking down the fillet problem (by CadaZ)
As many others wrote before, a fillet/chamfer feature would be really useful. It is also a challenging task for many reasons.

First a sweep/loft feature is needed where a profile is projected along a curve. Additionally this profile should be transformed to follow the filleted edge.

The problem is when three (or more) edges meet (especially with different dimensions) they form a boundary that cannot be patched with anything circular. So my idea is to use conics as a general solution and derive the common fillet shapes from it. Today most professional CAD systems offer circular fillet, curvature continuous conic fillet and chamfer. Circular fillet and chamfer can be viewed as specific solutions of the conic with 0.414 (at 90) and 0 rho parameters respectively.
Conics are also easier to manipulate so it would be easier to find a solution if self intersections occured, or variable/asymmetric fillet is needed.
Thu Oct 25 2018, 18:10:03
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