How to create some kind of mix blend between 2D textures and 3D scene

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Hi. I'm curious. I want to create some kind of atmosphere.

Like the blend mode in photoshop between two layers.
I want to blend (darken) and / or overlay some colors to accentuate some part of a scene.

My camera is static so could i blend something with a 3D scene.

By using a viewport (or blend 2 viewport) ?
By using light (like cookie in Unity) ? :thinking:

I'm new so how can i blend something (image with color and / or alpha) ?

2

You can use the modulate property in 2D and an overlay material in 3D.

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