Wasn't it Xplo Eristotle who wrote:
>So I've got this scene written for MegaPOV 0.7 with the following code 
>in it:
>
>#declare worldnet5 = function
>   {
>   pigment
>     {
>     marble
>     color_map
>       {
>       [ 0.0 color rgb 0 ]
>       [ 1.0 color rgb 1 ]
>       }
>     rotate <0, 0, 90>
>     }
>   }
>
>#declare worldnet7 = function { pigment { radial frequency 48 turbulence 
>4 } }
>
>#declare worldnet9 = function { (min(worldnet7+.9, worldnet5) * 
>(worldnet7 * worldnet5)^3) * 100 }
>
>...and I was trying to make it work in POV-Ray 3.5. Well, changing the 
>power operator to pow() was a no brainer, but it kept giving me parsing 
>errors for worldnet9, no matter how I tried to fix it. Finally I gave up 
>and looked through the documentation to see exactly what was going 
>wrong. The documentation is far from easy reading, but the impression 
>that I got was that what I'm trying to do may not be possible at all.
>
>As far as I'm concerned, whoever changed functions for 3.5 butchered a 
>perfectly good syntax.. but that's not the point, the point is, *is* it 
>possible to write this function in 3.5, and if so, how should it look?
>
>-Xplo
>

The syntax is

#declare worldnet9 = function { (min(worldnet7(x,y,z).grey+.9,
worldnet5(x,y,z).grey) * pow((worldnet7(x,y,z).grey *
worldnet5(x,y,z).grey),3)) * 100 }

I know the syntax is slightly more complicated, but that's the price you
have to pay for the considerably increased functionality.

-- 
Mike Williams
Gentleman of Leisure

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