Sven Littkowski wrote:
> Hi Jim,
> 
> I tried out your posted sample code. Hmm, my result is a fascinating, 
> entirely black image, ha ha! 


I even added that "+B2" option to my ini file.

I don't know what you mean by this.


> 
> Any ideas what might have went wrong?
> 
> I still keep on trying different settings.
> 
Not sure what the problem is.  Attached are tests I just ran using the 
file that I posted.  I ran the file itself with no ini file or any other 
settings

The first is the file as it is.  Notice that in that file, the camera 
light has been boosted up to "rgb 3" for demo purposes.   Notice also 
that there is a tiny sphere positioned at the camera location.  This is 
a trick to boost the contrast of the scene.

When I saw the outcome I suspected that the media block labelled "large 
pieces" was not making a contribution so I altered the color_map in that 
block to this:
color_map {
   [0.000 rgb <.025,.025,.022>*3]
   [0.055 rgb <.025,.025,.022>*3]
   [0.060 rgb 0]
   [1.000 rgb 0]
}
And the result can be seen in the second image

The third image is the same thing except I  took away the 
contrast-producing sphere

The final test shows what happens if the number of samples is reduced to
#local S_low = 10;
#local S_high = 20;

Changing the color and eccentricity values on the scattering keyword can 
also have significant effects.

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