news:4754882c@news.povray.org...
> The upper face of the pedal has a sawtooth-shaped profile, which
> should show up when illuminated from overhead - but regardless which
> values I choose for specular and roughness (or phong and phong_size), it
>  remains black without visible structure. What goes wrong here?

What color are you using? #000000 pitch black gives you zero to work with. A 
very dark grey (as noted by those who render wheels and tyres/tires) is 
necessary to make the black work. Are you working with a 256 color palette 
on your old machine for your render? That would also limit your options.
DLM

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