I tried this with my bezier curve include file. Of course you just need
to find the derivitave of the spline function, it should give you the
tangent direction. Of course this is a lot harder than it sounds. I've
wasted half a ream calculating the derivitave of a bezier function.

Josh English
eng### [at] spiritonecom
http://www.spiritone.com/~english

Disnel wrote:
> 
> Thank to all, you are right and I think, that it will be sufficient.
> 
> But I wanted to ask if there is some way to get exact tangent (another
> than reimplementing POV spline in POV language, of course ;-) The answer
> is probably not.
> 
> Regards
> 
> Disnel

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