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I'm new to blender, and I'm a hard time understanding layers and collections. I started using Blender on 2.8, and most of the topics I read about the matter compare how it works now with how it used to work. I know I can do this by using layers and collections but I would really appreciate a step by step guide.

This is my scene:enter image description here

There is a background, a shirt, and a backlight between them, to light the shirt. I want this area light to affect only the shirt, and not the background. But I do want the background to be affected by everything else (shadows, other lamps and such). How should I proceed?

Thank you very much!

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You will have to create separate layers for each render, elements that you want to be effected separately put them in different collection. enter image description here

Basically you can create the whole scene and then duplicate the render layer, in one of them disable the view layer (right-click on the collection --> View Layer --> Disable from View Layer.) Do the opposite on the other render layer.

enter image description here

Use the compositor to stitch the images together using Alpha Over node. enter image description here

attaching a .blend file for you to review.

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  • $\begingroup$ I kinda got it... but what if I want the shirt to still cast shadow over the background? $\endgroup$
    – André Luiz Gollo
    Oct 9, 2020 at 16:02
  • $\begingroup$ @AndréLuizGollo Maybe try to create another layer with a background plane 'shadow catcher' youtube.com/watch?v=EBoiG6jw6MU $\endgroup$
    – four two
    Oct 9, 2020 at 16:19
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    $\begingroup$ I got it now! I duplicated the shirt and disabled its camera visibility. :) Thanks guys!! $\endgroup$
    – André Luiz Gollo
    Oct 9, 2020 at 16:22
  • $\begingroup$ That's actually easier ;) nice work $\endgroup$
    – four two
    Oct 9, 2020 at 16:23
  • $\begingroup$ The answer is very dense in content (for beginners like me). Keep in mind that you need to have two different rendering layers (not two different scenes). It is written in the answer but took me while to figure it out. $\endgroup$
    – Majid khalili
    May 31, 2021 at 15:18

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