On 2025-09-11 03:24 (-4), William F Pokorny wrote:
> On 9/10/25 20:08, Cousin Ricky wrote:
>> I tried samples 10, 10, and that improved the reflection; but now the
>> media photons are considerably dimmer than before.
> 
> [snip]
> 
> A simple example. Suppose looking down on the media box we have,
> vertically, a very thin layer of deposited photons. In our set up we
> take 3 primary samples and no adaptive samples. Further, camera ray
> paths traveling down into the media box are such that only the middle
> sample of the 3 lands in the middle of our thin layer of deposited media
> photons. The resultant media intensity is calculated as 1/3 for the
> three samples.
> 
> Now we up the samples to 10, but still only one of those 10 sample lands
> in our thin layer of deposited photons. The calculated media intensity
> is now 1/10 for the samples taken.
> 
> [snip]
> 
> With that mirror's reflected rays, and our simple example, we could have
> reflected ray paths which run much 'longer' within that thin layer of
> deposited photons than they do more generally in the scene - resulting
> in unrealistically bright reflections.

So, what I'm getting is that my earlier renders were too bright, and the
"dimming" is actually a correction.  I had set my media box much wider
than the light beam because I wanted to catch any light that got
refracted outside reflection layer.  Looks like I'll have to customize
my media container if I want to catch those refracted rays without
blowing up the render time.

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