> I assume you mean -y and +y for a turbulence of <0,1,0>.
>
> But anyway, isn't what you're asking for equivalent to using turbulence 
> plus translation?


I see that I'm not making myself clear, and yes I meant -y +y.  ( perhaps I 
should re-read these before posting sometimes)

Imagine a spherical pattern, apply warp <0,1,0>.  Some of the disturbed 
pattern appears above the original sphere, but some also appears below the 
sphere. What I would like is to push the the disturbance in only the +y 
direction.

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