Effect Auto-Exposure doesn't match camera Auto-Exposure

Effect Auto-Exposure doesn’t match camera Auto-Exposure using the same values.

auto_exp.zip (3.5 MB)

It looks like Effect auto-exposure is way too less sensitive than Camera auto-exposure

Manual says that

image

but they are not linked at all except using scenes.

I thought that Effect exposure is a global exposure that affects all cameras but you can tweak it using individual camera exposures. Currently they override each other depends which one was used last. Strange.

Something very bad is with these two different exposure systems. They should be unified and works together.

Also camera auto exposure value is not saved in file. It reset to 0 every scene reloading.

Effect and Camera Auto-Exposure. The same values :

It looks like Effect auto-exposure doesn’t work.


Using Scene Camera it doesn’t work too until camera auto-exp slider is not clicked, activated :

autoexp.zip (3.7 MB)

Also Scene camera auto-exp value is reset to zero after scene reloading too. Completely not production ready feature at the moment.


Effect auto-exp completely doesn’t work compared to camera auto-exp :

a_exp.zip (2.9 MB)

Ok I found issue.

Camera auto-exp works fine in all scene conditions but it always produce too bright results like 0,4-0,7 exposure value. It take into account brightness of objects in view.

Effects auto-exp is buggy. Unlike camera auto-exp it take into account brightness of all objects in scene - not only in current view. This is why when project has many objects it completely doesn’t work.

Camera auto-exposure value is not saved in scene. It is reset to 0 after scene reloading.

image

Hi @Smolak

The camera exposure values in Camera and in Effects are handled separately. We’re considering having them linked at the same time sooner. Thanks for pointing this out.

Hi @Clov,

I think that it would be much better to leave them separately but add other functionality for them just like in all other render engines like Octane where you have Global Exposure which affect all cameras exposures.

For example. If Global Exposure in Effect was set to -2 and if you switch to camera which has exposure set to -4 in total exposure view is -6 ( -2 from Global and -4 from Camera ). So camera exposure is added to global exposure.
If Global exposure is -2 and camera exposure +3 in total we have final view exposure +1

This is very great for situation where we change lighting in scene populated with many cameras with different exposures. After that there is no need to change exposures of every camera but only Global Exposure that affect all cameras in scene.

That’s how it works in other renderers.

Hi @Smolak

Alright, thanks for your insights regarding this, I’ll also be sharing this to our team.

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