Hi Michael,

If it was like your example of the yellow dotted lines inside the gray box it would be great!
But if this would make the regular hidden lines like that, then I agree it's not good.

And also circles and round objects have no outline edges If I understand correctly.

Maybe for solids it could be faces that shows in a faint tint, just enough to have an hint of the occluded set.

Regards,

Marc