thanks for the tip on the workaround. as for making ior equal to 1, i then
get no neat caustics from the surface normal on the disc :/ i guess thats
what you meant by cancelling it out.

thanks again,
ross

Slime <slm### [at] slimelandcom> wrote in message
news:3dd56cfa$1@news.povray.org...
> Well, the shadow is there because the light that would normally be taking
up
> the shadow space has been refracted and is instead landing elsewhere,
> creating the caustic patterns. You can see why this is done by making the
> ior of your disc equal to 1. Then the photons should almost exactly cover
> the shadow, cancelling it out, except for innacuracies. If the disc had no
> shadow, that area would be brighter, which is physically unrealistic.
>
> Simple workaround: Render the scene with the shadow, and save the photons
> with save_file. Then remove the disc from the scene, and use the saved
> photons with load_file.
>
>  - Slime
> [ http://www.slimeland.com/ ]
>
>

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