Hi blackboard,

re:
> Oh thanks,i don't now why if i choice dark theme my viewport color stay white as
> default,i change color and its work

That will happen if you've set a custom viewport background color in a previous version.

You can reset it to follow the theme color under Options > View > Colors > Background color: "From theme".


re:
> I have another question do you want add full acis possibilities or only fillets?

I'm also expecting to use it for Chamfer, Shell/Offset, and what is called "Direct modeling" functions like transforming an individual face and the surrounding faces extend to meet the edited face. That should be a good spot to wrap up v5 at that point.

Over a longer period I'll probably experiment with replacing other things like booleans.

- Michael