Scott, SV stands for Stereo Vision. Among the upgrades you'll find is the
ability to produce stereo pics for the Haitex glasses, a hi-res,
much-improved editor, color wireframes, and more textures. The best thing
about SV, however, is the solid model rendering. Many of us no longer do
raytracing because solid model works so well. The upgrade will cost you
$30 and is available only from Impulse when you send in your registration
card. –Rick