Wasn't it Mick Hazelgrove who wrote:
>In this case an isosurface - is there a way of transforming an isosurface so
>thet the top is made thinner than the bottom?

Here's a non-linear taper:

#declare F to be your original function(x,y,z) then use

isosurface {
     function{F(x*(1.5+y/2),y,z*(1.5+y/2))}  

This tapers from the initial width at y=-1 to half the width at y=1


-- 
Mike Williams
Gentleman of Leisure

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