>If you want to, try rendering it both ways and then
>do a difference on the two images to see how much light the photons
>contribute.  Personally, I'd find that very interesting.

Thanks for the explanation. I will try what you suggest. Let's see what
happens. :)

>The reflective caustics from the cylinder, unfortunately, will always be
>very dim.  The shape of the cylinder disperses the light, so that it is
much
>dimmer and is drowned out by the direct light.  That kind of reflective
>caustic is generally only visible if it reflects into a shadow, and even
>then it is dim because the light energy is spread out over a large area.

Interesting. OK. Thanks. :)

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