Clouds

Perhaps it was a month ago, maybe even more, that I had an idea to generate clouds. I've seen it done with plain images, or stacked layers of perlin noise, both of which are interesting methods. I had an idea, however, to make clouds as they are made in the real world (or at least, as I believe they are). Water vapor in higher density is more opaque, and will appear white and fluffy. Lower density yields more transparent wisps of cloud.

Mah fluffeh clouds