Blender is now equipped with decent tools which allow to create 3D clouds. Alan’s Cloud Generator is a script that generates some cool interactive volumetric clouds.

Alan (aka RipSting) writes:

I’ve been doing a lot of atmospheric modeling lately and wrote a script that generates some cool interactive volumetric clouds! Not only can you see the shape of your clouds in the interactive 3D window, but you can animate their properties with IPO curves. When you’re done automatically generating points, you can edit them and delete the clouds that you don’t want. Then, it turns the clouds you DO want into faked volumetrics. I say fake, because it will only render correctly from the camera’s perspective, so it won’t work that well yet with extreme reflections.

Visit the BlenderNation website for some sample renders and animations.