You don't really need photon statements for objects not actually using
reflection or refraction (or media), except to control with collect off
(default is on, or photons affect all objects).

I think what you're saying about photons not being stored is due to there
not being any reflection of refraction for the media-filled sphere. In other
words, the sphere itself hasn't any reflective finish nor ior.

However, having tried your script, if 'refraction on' is added to the
sphere's photon statement they are stored and a caustic is seen. Although
then it's unrealistic. Not sure what you were wanting to have the media do,
besides make shadows and illuminate in the light. It already does that
without photons. So maybe you could explain the desired effect?

Bob H.

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