In article <3d99a874@news.povray.org>,
 "Andrew Coppin" <orp### [at] btinternetcom> wrote:

> But... suppose the object is contrained to the X-Y plane. (And let's suppose
> that whatever mechanism "constrains" it has no friction - impossible but
> simpler to compute ;-) What do we do now? Do we just write V = <5, -7, 0>
> and continue as usual? Or does something more ellaborate need to be done?

The component of force perpendicular to the plane can be ignored. If you 
have a perfect horizontal plane and the only force on a ball sitting on 
it is gravity, the ball won't move, and if there is no friction, the 
gravity won't affect the force required to move it in any direction 
parallel to the plane.

-- 
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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