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Yurii D avatar image
Yurii D asked ·

Arnold does not support physical camera exposure?

Hello!

Tell me, please, I correctly understood, after reading some posts, that Arnold does not support the physical camera exposure in 3ds Max? After rendering, RGBA AOV and other AOVs are dark when with exposure on. This also negates the Arnold denoiser option...

aovs
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Yurii D avatar image
Yurii D answered ·

Aaron, generally clear, thank you! I use 3ds max 2019 and the latest Arnold. If there is a place to be a bug in the matching ranges Exposer value, this is of course bad, we'll have to get out of this situation…

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Aaron Ross answered ·

The beauty pass does support camera exposure. But AOVs always bypass camera exposure. This is by design. AOVs are intended to be composited and color graded in post-production.

However, there may be some bugs with camera exposure in the beauty pass. I have encountered issues with specular reflection of environment maps when camera exposure is set to physically plausible values for exterior daylight... e.g. when Exposure Value is set to ~13, the Specular component of environment reflections is too dark. Currently the only workaround I can find is to set Exposure Value to the range of ~6, and adjust the lighting accordingly.

I believe that many issues are the result of Arnold's exposure value ranges being different from the native 3ds Max exposure value range. Depending on your version of 3ds Max you may need to make adjustments to your light intensity. But in general, Arnold wants the Exposure Value to be around ~6.0.

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