BTW... Here is the balloon block I was talking about. The image on the left
uses:

    photons {
        pass_through
        collect off
    }

And the one on the right uses:

    photons {
        target
        refraction on
        reflection on
        collect off
    }

I like the photon effects in the right side image, but I don't like the
shadowy interior of the block. Again, any suggestions would be appreciated.

 - dan B hentschel

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