Usually if you want something to import with nice smoothing in Bryce, then .obj format is the way to go. A lot of the other formats don't seem to carry over the smoothing data/groups as well and you'll see polys. .3DS is particularly bad that way. (Although sometimes having hard edged polys can be a good thing.)

Fran, if you're interested in cars - I may have a few unusual freebie models floating around. If you're interested in a Viper in particular, some guy called Hellborn did a free one in Wings3D. But that's going a long ways back. I'm not sure if he or his model are even around anymore.

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.