George Pantazopoulos wrote:

> 
>     I was just looking at some icicles shining in the sunlight today, and
>     I
> wonderedif allowing a HDRI image to shoot photons would produce some
> interesting results. Having the whole map shoot photons probably wont look
> good, but what about allowing only the very brightest parts of the HDRI
> map to shoot photons? (set by some threshold)

Or even better a spline based curve that determines the probability of a
given pixel value generating a photon.
(like the "curves" tool in image processing programs.)

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