Warp wrote:
> 
>   The only concern I have about it is that it uses the "trick" to calculate
> the normal of the spline with the Spline(T+Epsilon)-Spline(T-Epsilon)
> formula. What I'm not sure about is the value for 'Epsilon'. I used 1e-5,
> but that might sometimes be either too big or too small (due to floating
> point number inaccuracies).

No problem, just write a symbolic manipulation include that does
derivation and have it find the exact slope... ;)

-- 
David Fontaine  <dav### [at] faricynet>  ICQ 55354965
My raytracing gallery:  http://davidf.faricy.net/

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