Hi, I have a media related question.
If I trace two transparent sphere with a smoke-like media inside, everything
is fine. If I dare tracing three or more in my scene, I get to see the
interior surface of the spheres as black patches.

I have provided more details of what I do below. The whole smoke process is
inspired from the IRTC entry Strike that won the "First contact" round in
98. Their code does not run as is. I use POV 3.5.

cheers,

Christian


First lets pretend I have the following
code (by memory).

#declare tex =
texture{ pigment {rgbf<1,1,1,1>}
            finish{ambient 0 diffuse 1}}

#declare int =
interior{
            media{
                    scattering {1, <...> emission 1.0}
                    density{
                            spherical
                            color_map{...}
                            turbulence 0.5
                    }

            }

}

#declare mymat =
material{
    texture{tex}
    interior{int }
}

if I create only two sphere:

sphere {<0,0,0> 200 material{mymat}}
sphere {<0,0,0> 200 material{mymat} translate 100*y}

I get a beautiful smoke column made of two chunks of smoke. But if I add a
third sphere:

sphere {<0,0,0> 200 material{mymat} translate 200*y}

I get a beautiful column, but the interior surface of the spheres shows as
black patches. If I merge two of the spheres, I get no patches but the third
sphere is cut-off and the shadow cast by the smoke is also cut-off. I also
tried union of these spheres, with no good results.

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