1) Remove the 'caustics' definition.
   That has nothing to do with photons and will only interfere with
   the correct renering of photon mapping (it's a cheap trick to get
   fast but very inaccurate caustics, and it doesn't work with media
   anyways).

2) You probably don't need to use fade_distance and fade_power because
   you are using media anyways. Those are cheap&fast tricks to get the
   look of a colored material much faster than with media. Since you
   are using media anyways, you don't need them.

3) Since the sphere contains media you have to define 'hollow' for it.
   (This is basically a historic thing; don't pay attention to its
   illogicality.)

4) After the changes above you will have to reduce photon count to
   about 100000 and the media count to about 100 in order to get a
   decent parse time.

-- 

                                                          - Warp

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