You can't, unfortunately.
> Such polygons are *ATTATCHED* to a parent polygon, and are
> drawn on top of the parent polygon, if it is not back-face
> culled.
Yes, they're a good idea both for performance reasons and to avoid
problems with shallow Z-buffers.
> Attatched polygons are available in Lightwave and the old
> Videoscape3D
And in Superscape, and probably lots of others as well. Not sure how the
converters handle this case; the best they could probably do is to move
the detail polys along their normal by some small (user-settable?) amount.
The problem is that if the amount is too big you get the "windows floating
in front of the wall" effect you described in your message, and if the
amount is too small you hit the resolution limits of the Z buffer and get
the nasty "smesdded polygon" effect.
-- Bernie Roehl University of Waterloo Dept of Electrical and Computer Engineering Mail:[email protected] Voice: (519) 888-4567 x 2607 [work] URL:http://sunee.uwaterloo.ca/~broehl