My smoke renders as squares/cubes I'm making an animation scene where black fog swallows a grassy field, but I have a problem with the smoke simulation. In the view port it looks fine, but when I render the smoke it is boxed and squared, and looks like cubes (I have baked the simulation).

I have tried different things, from people with similar problem, but nothing works..

Any idea why, or advice?

Thanks :)

example:



Smoke domain set up:



Smoke compositing:
Increasing resolution divisions in domain and, in smoke high resolution fixed the problem.

Thanks to Merlin.