Well, the spore system uses particle emitters -_- which we decided not to use in favor of a grid based approach (so that we can actually collect the compound clouds).
I completely agree that they are too solid, and it bothers me, but I don’t think that I can do much. It would be nice if I had a concept image (no terrain just a cloud) I could be replicating. Speaking of which, who drew the Thrive concept above? I’d love to hear what they did to get the clouds looking the way they are.
Actually, now that I think about it, putting a Perlin noise texture above the existing cloud to use as an alpha channel might work.
The clouds don’t look any better in a video, sadly. Maybe later.