> // for scaling the noise function
> #declare XS = 0.001;
> #declare YS = 0.001;
> #declare ZS = 0.01;
>
>   isosurface {
>
>     function {abs (BlurPlane (x/XS, y/YS, z/ZS)) - Thickness}
>     //open
>     threshold 0.5
>     //max_gradient 10
>     accuracy     0.01
>     evaluate Gradient*Min_factor,  sqrt(Gradient/(Gradient*Min_factor)),  min
> (0.7, 1.0)
>     contained_by {box {<-3, -2, -1>*Range, <Whole*3, 2.3, 1>*Range}}
>     hollow
>       texture {T_Glass}
>       interior {I_Glass}
>       //texture {Tex1}
>      scale 1
>      rotate x*1 // Seems absolutely essential!  :O
>      translate <-1.5, -0.5, -7>
>     }

This is great! If I can't get focal blur working how I want it I can blur it
with this. I'm pretty new so when people where talking about a blur plane I had
no idea how to make that. I'll try veeery small aperatures first then try this
one

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