[geedy]

I am building a BRep CAD kernel from scratch.

I intend to open source it once fillets work real good. That will take a while, but I've made pretty good progress since I started 10 weeks ago.

Medium term goal is to release a GUI application that can be used to import STEP files and just do very high quality fillets in. Would be very useful for many hobbyists, I think.

[mym1990]

As someone who is just learning CAD…what makes a fillet “ver high quality”?

[geedy]

"They just work" is a surprisingly important start. FreeCAD improved a lot with it's latest release, but it still has many flaky gaps. Caps / apices are especially hard.

Higher order continuity native to the blend would be a requirement for many, too, and the algorithms only get harder and trickier to verify correct.