Is there a way to make muzzle flash come out of a gun using the smoke simulator with fire and smoke? I've seen a lot of tutorials that use an object coming out of the gun that lights up, but it doesn't seem to look as realistic as real fire.
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Usually you wouldn't want to create a muzzle flash using a smoke simualtion. The flash is only visible for one frame.
I'd recommend you to parent a plane to your gun and create a Material for the flash with animated transparency. Plug an image texture of the flash into an emission shader, so the flash illuminates the scene accordingly.