Vray Camera gets darker when I go closer - why?

V-Ray V-Ray for 3ds Max Issues
1

Please see screenrecording here:

Camera settings attached

(Vray6, Max 2024)

Thanks

camera gets darker.png
camera gets darker.png562×1638 74.8 KB

2

Auto-exposure on maybe?

3

I think not, I can’t see it on my screenshot.

It’s not important today for me but weird

4

This is likely normal: it’s the modelling of the camera inner workings, and if it is so, it’s also analogous to the real world counterparts.
If you think it’s not, please share a scene and some more info.

5

See this thread- Specifically this post explains it:

https://forums.chaos.com/forum/v-ray-for-3ds-max-forums/v-ray-for-3ds-max-problems/1185275-mismatch-between-vray-physical-cam-and-max-physical-cam?p=1185309#post1185309

It’s mimicking the behavior of a lens focusing close, where there is more light falloff when the lens gets farther from the film plane.

6

yep, as the real world sample in the docs i linked above. :slight_smile:
As it’s now possible to just screenshot and paste, here:

image.jpg
image.jpg1854×713 279 KB
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7

But the thread provides info on how to prevent this behavior if you wish, and explains why this behavior occurs, and how it is calculated. The docs are a little thin on details.

8

You’re right.