On 7/19/2018 8:25 PM, Bald Eagle wrote:
 >
 > Since it's symmetric around the origin, just scale it.
 > If you need a "2D" part of it, just take a slice out of it.

Not sure what you mean. The offset surface of an ellipsoid is definitely 
not another ellipsoid, so simply scaling it won't work.





On 7/19/2018 8:25 PM, Bald Eagle wrote:
> 
> Also of interest:
> 
> http://xahlee.info/SpecialPlaneCurves_dir/Parallel_dir/parallel.html
> 

Interesting. I can't read the formula however. It's been too long since 
took calculus.

:(



> It's involved with curves, and I just cheated and used trace()   ;)
> 
>
http://news.povray.org/povray.advanced-users/thread/%3Cweb.592816879146df1fc437ac910%40news.povray.org%3E/
> 
> 
> 
> 

Do you have any renders of your efforts that you might share?


Mike

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