SafePit schrieb:

> I like the paint and imperfections of the surface.  Did you use a warp or other
> finish to do that?

Thanks. The irregularities in the reflection are simply two overlayed 
"bumps":

   normal {
     average
     normal_map {
       [1 bumps 0.01 scale  2.0*in ]
       [1 bumps 0.05 scale 20.0*in ]
     }
   }

where "in" is a distance equivalent to 1 inch in the model.

The rivets are just spheres.

The corrugated catwalk uses an isosurface based on a "bump map" image; 
an actual bump map turned out to be problematic regarding the direction 
of light (an old ailment of POV-Ray's bump mapping), and the isosurface 
didn't bog down rendering time too much.

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