@thomthom said:

I've noticed something odd that of you have a group selected and minimize and restore the SU window - soft/smooth edges inside the group will suddenly become unsoftened. Could it be you're affected by this?

to ThomThom - well, I tried to re-create the effect you talk about, and of course could not do it. It seems to happen to me when closing out SU altogether, then re-opening it. That is, the lines previously "smoothed" do not stay smoothed in the newly opened window. Sorry, I was imprecise in my original post -- did I say "hidden"? what I meant was "smoothed" - actually, the two merge together in my mind, since once an edge is smoothed, it also becomes hidden. But what happens to me, is that they become visible (un-hidden), and so far, the fact that they are no longer smoothed does not seem to be an issue with this model - it looks OK for what I am doing. I will observe more closely.

to TIG - you are on to something when you suggest that the lines in question be "hidden" with shift + erase. I have tried that in a little quick experiment. Although the result was inconclusive, as the lines did not re-appear when closing-opening the model, I will see how that solution holds up over the next few days. Here is a screen grab for you.

BTW to ThomThom - those are the coolest glasses.. what the heck are they?

double thanks

showing visible edges on the left, that were previously hidden/smoothed

This looks like the best place to post my question about hidden lines, although I think I may be starting a new thread...
I've a model of terrain that keeps unhiding some of the edges, after I've laboriously ctl-erased them. They come back, in the same session, and more come back when I close and then re-open SU7. Also, it seems to be the same lines/edges that return. Again, not all edges, just some of them (of course, the ones right in my saved scene).
Any thoughts about why, or if not, how about what to do to make them stay hidden?
thanks, mille grazie
mojo
SU7 pro, Win7