"Trevor G Quayle" <Tin### [at] hotmailcom> wrote:
> sun.    Based on manually checking, the maximum pixel value in the HDR is
> ~10,294.  For the top image, a pixel level of 200 is used, the maximum pixel
> value found is 1,689 (~16% of the actual max).  In the bottom image, the
> sub-sample threshold is set to 0.9, the susbsample variance is set to 0.99, and
> the recursion limit is set to 5.  The parse (not including render) time for the
> top image was 26.25s.  For the bottom image, the parse time was 28.75s.  To get
> the equivalent pixelization level would mean setting the value at 48,600 instead
> of 200, and parsing (if even possible) would be expected to take at least 60,000
> times as long (3^5^2=59,049) or about 18 days!

I realized that I was a bit over zealous here with the recursion level as the
HDR image is only 1024pixels high.  A recursion level of 2 should suffice
(200*3*3=1800).  This would have still resulted in an equivalent increase in
parse time of 81X using the original method.

-tgq

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