> It basically amounts to using density and density_map as the pigment and
> color_map replacement, except now it's just the rgb vector instead of the
4
> or 5 rgbf or rgbft.  To get more transparency the density must be low, and
> higher for more solid.

You mean light colors in the map are more transparant, and dark colors more
opaque?

In the translation from

         halo {
            emitting
            spherical_mapping
            linear
            color_map {
              [ 0.0 color rgbt <1, 1, 0, .999999> ]
              [ 0.5 color rgbt <1, 1, 0, 0.5> ]
              [ 0.8 color rgbt <1, 1, 1, 0> ]
              [ 1.0 color rgbt <1, 1, 1, 0> ]
            }

to

            media {
               emission <1,1,0>
               density {
                  spherical
                  density_map {
                     [0 rgb<1,1,0>*0*D]
                     [.5 rgb<1,1,0>*.5*D]
                     [.8 rgb<1,1,1>*D]
                     [1 rgb<1,1,1>*D]
                     }

the result was both too opaque =and= too light in color.

--John

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