On Tue, 21 Jul 2009 21:08:32 +0200, yara <yar### [at] gmailcom>  
wrote:
>
> sphere_sweep{cubic_spline 2
> <20,3,-.5>,.5, <.5,16,-.5>,.5 }
>
> thats whats giving me the error
> did i write it incorrectly?

You need at least four control points for a cubic spline.



-- 
FE

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