Hi Michael,

> Maybe I should treat the case where all faces
> are hidden as special and only in that case
> draw the highlight as the halo around all edge curves.

That sounds good, is that per solid, joined surface or single surface, like if I have two soilds and one of them is in wireframe I'd like the wire frame of that solid to pre-highlight or are you saying that the whole scene has to be in wireframe?

-