Hi Brian,

> I think ViaCAD, Free SketchUp7---Blender----all have it now?

I think ViaCAD yes - but SketchUp and Blender? No - those are not even NURBS based applications so no NURBS surface variable radius fillets will be found in there...

I think that Blender is in the very early stages of adding in some basic NURBS functions. But filleting is an extraordinarily difficult area to implement, it's something that is going to likely take a very long time and a lot of effort before it would be implemented there.

ViaCAD on the other hand has a really good filleting mechanism in it (calculation-wise, the UI is somewhat awkward), that's one of the reasons why it can be a nice companion to have to use along side MoI.

- Michael