Wasn't it ashwmk who wrote:
>I am currently trying to render a semi-transparent spherical isosurface. I
>set a pigment with a transmission value of 0.75, however when I render the
>image the color on the surface of the isosurface becomes transparent but
>all that remains is a solid black form of the isosurface, which does not
>seem to resond to any transparency value I set.

have you checked the Messages pane to see if it mentions the
max_gradient setting?

I suppose that it's possible that several layers of your isosurface are
in line of sight, so you may need to adjust max_trace or
max_trace_level.

-- 
Mike Williams
Gentleman of Leisure

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