question

NOID SAS avatar image
NOID SAS asked

Emission AOV-Light Groups

Hi,

here is a simple scene to illustrate my issue.

I have two lights that I have separated into two groups (KEY and BACK).When I use the light groups and the emission aov, the aov per light are empty. Same problem with the transmission aov, the lights are not visible in the refracted object.

MtoA 4.2.1.1
Arnold Core 6.2.0.1
Maya 2020.4

emission-beauty.pngemission-back.pngemission-key.png


aov
emission-beauty.png (325.7 KiB)
emission-key.png (16.1 KiB)
emission-back.png (15.9 KiB)
2 comments
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There's no scene attached, can you upload one? I wasn't able to reproduce in a simple scene (plane and two spheres) with two area lights.

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NOID SAS avatar image NOID SAS Stephen Blair ♦♦ ·

Here's the link for the scene.

https://drive.google.com/file/d/1dSnRlwBUYx4AucLxOyi7KgnDgZRp2SDt/view?usp=sharing

Sorry it seems that i can't upload the scene directly inside the post...

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Stephen Blair avatar image
Stephen Blair answered

The light contribution doesn't go into the Emission AOV.

In the Emission AOV, you'll see just the visible lights (what is visible to the camera).

For the light group AOVs, you have to get them for an AOV like RGBA (the beauty), or diffuse, or direct, ...

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NOID SAS avatar image
NOID SAS answered

Thanks for the answer. I understand that the contribution is not in the emission aov.
What I would like to obtain is the visibility of each light in its own light group. Currently, it seems to me that only the "global aov" includes the visibility of the lights. But when it comes to reconstructing the beauty by light contribution, it is preferable to recover the visibility of each light in a separate aov.

It is even more important for the transmission.
Besides I noticed that the lights appear well in their respective group for specular_direct aov.
Why isn't the same behavior applied for transmission and how can I recover the visibility of each light separately in a refracted object ?

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The light visibility does not contribute to the actual lighting of the scene, so it won't appear in light group AOVs.
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