Wasn't it ashwmk who wrote:
>I have done both already. Here is the code in case someone can spot a
>problem:

It's nothing to do with the Isosurface code. That pigment with that
lighting just happens to be very dark. Here's a sphere with the same
colour and it's black too.

#include "colors.inc"
background {color rgb <0.5, 0.5, 0.5>}
camera {
 location <5, 0, -4>
 look_at 0
 focal_point 0
}
light_source {<4, 4, -4> color White}

sphere {0,3 
 normal {bumps 1 scale 0.2}
 texture { pigment {color rgbt <0.5, 0.1, 0, 0.75>}}
}

global_settings {
 max_trace_level 10
}

-- 
Mike Williams
Gentleman of Leisure

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