I've posted some scene code in povray.text.scene-files which does nearly 
what you asked for. The code takes a spline path for a single wheel to 
follow, and rolls it along the path, rotating it correctly for the 
distance it follows. Varying velocity is done by adjusting the spline 
path. For a car, you may want to integrate the distances each wheel 
travels, otherwise the individual wheels will "slip".

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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