> #declare O = object {with surface normal = +y};
> #declare K = <what you want the surface normal to become>;
> 
> object
> {
>   O
> 
>   rotate x*atan2(K.y, K.z)
>   rotate z*atan2(K.x, K.y)
> }

Hang it all... that doesn't actually work at all! >_<

My brain hurts...

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