If you are new to Arnold you are probably looking for RAW lighting and albedo AOVs in the AOV editor. And yes you are right, they are not there. At least when using AiStandard shaders.
The easiest and fastest solution would be to use AlShaders, they include both, RAW lighting and albedo AOVs. But if you need to use AiStandard shaders, you will have to create your own AOVs quite easily).
- In this capture you can see available AOVs for RAW lighting and albedo for the AlShaders.
- If you are using AiStandard shaders you won't see those AOVs.
- If you still want/need to use AiStandard shaders, you will have to render your beauty pass with the standard AOVs and utility passes and you will have to create the albedo pass by hand. You can easily do this replacing AiStandard shaders by Surface shaders.
- if we have a look at them in Nuke they will look like these.
- If we divide the beauty pass by the albedo pass we will get the RAW lighting.
- We can now modify only the lighting without affecting the colour.
- We can also modify the colour component without modifying the lighting.
- In this case I'm color correcting and cloning some stuff in the color pass.
- With a multiply operation I can combine both elements again to obtain the beauty render.
- If I disable all the modification to both lighting and color, I should get exactly the same result as the original beauty pass.
- Finally I'm adding a ground using my shadow catcher information.