Disable reflective caustics

[maru]

Where did you read this ?

Here:
https://forum.corona-renderer.com/index.php/topic,608.msg4587.html#msg4587

the max sample intensity parameter is relative to the current color mapping, so starting render with different exposures will result in different max sample intensity, and in turn to different amount of bias in the picture. This is so that for example MSI 10 results in the same amount of bias in dim interior shot and in bright exterior one.  But once you change exposure after the render has started, you cannot change the already rendered bias.

:)

[maru]

And here comes the test:

*MSI is intentionally changed to 1

[Juraj]

Ok that's bit different thing, but still wasn't aware of that. Will mind it next time as I often like others start and keep renders under-exposed for post-production reasons, but this could cause some heavy bias in highlights.

Just changed default MSI in Vray3 (from 20 to 100) in current animation project which is already sampling based on quite natural exposure and I was shocked how dramatically everything improved. But I guess that's just flawed integration of all these new features there..

[snakebox]

So what difference are you seeing directly? I guess I currently haven't gotten my head around what those MSI values really mean in terms of visual change. Default at 20 seems.. okay?! what do I know. But is 100 considered high? slower? what kind of change do you expect to see?

Cheers

Edit: randomly found this through google! thanks :)
https://forum.corona-renderer.com/index.php?topic=3708.0

[maru]

Just remember that MSI does not affect only caustics but also GI. It cuts off intensity of light being bounced off of objects. The conclusion coming from this thread is that it's not a good idea to hit F9 and then significantly change exposure value. It's best if you set your desired exposure value first, and then render image.

[Ondra]

this topic got derailed... but either way it wont be implemented - MSI needs to be relative to stay consistent, and I wont implement more oldschool light transport hacks