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I would like to use several domains for a large fire simulation/animation because I need a high resolution to be able to get close with the camera. Unfortunately, the domains either overlap ugly or there is a gap, which is even more ugly. I've already tried my luck with several render layers, as suggested here. But because the material/fire is slightly transparent, the aforementioned overlap effect arises. Next I tried to mask the area in the compositor as suggested here, but I can no longer find this option in the current blender version (2.92). I have also tried cryptomattes, but they don't seem to work with fluids / volumes either (at least the pick output remains black / transparent). I would be grateful for good suggestions.

Edit: Maybe it is important to say that i want to use eevee for rendering.

Example

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