> Is there any way to implement materials that blur the image behind them?
> 
> The degree of blur should be related to the path length of light passing
> through a material so surface distortions won't work right.

Don't know if it hits some of pov's limitations, but:

Instead of using a material you might intersect your object with another one.
This second object is glass with bubbles inside, maybe some noise isosurface
or something like that.
In that way the ray will be distorted whenever it passes a bubble and that
will happen more times on thicker parts of the "material".


-- 
merge{#local i=-11;#while(i<11)#local
i=i+.1;sphere{<i*(i*i*(.05-i*i*(4e-7*i*i+3e-4))-3)10*sin(i)30>.5}#end
pigment{rgbt 1}interior{media{emission x}}hollow}//  Mark Weyer

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