How to use an image as background in a 3d world?

Question

I guess I should select the "Canvas" in the Camera mode, but I have no idea of what to do next.

Comments

Do you mean using it like a sky box or something like that?

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Yes, exactly that! I want to use an image of stars as the sky.

Answer 1

You can set the environment in your camera or add a world environment node to edit the environment.
Create a new environment (or edit the default one), make it a sky, and then select your image as the sky texture.

Comments

Thanks! But still, can you tell me how can I make the "Canvas" mode work?
I'm asking this because the camera im my game does not change its angle, so it may be better to mess with this option.

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I don't think you would be able to use canvas node because it's for 2d backgrounds and UI.
If you don't want to mess with the camera, use a world environment node. It'll still work.

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But I actually want a 2d background (in a 3d foreground).
I'm trying to use a Quad Mesh, but it doesn't look as good(too pixalated) as a simple Canvas Layer.