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Khaos Dragon

animated clouds using perlin noise

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Is perlin noise a decent method for creating animated clouds. I have researched several pages on perlin noise (there are only a handful of decent ones) and have managed to create some nice 2 dimensional perlin noise that represented clouds. If perlin noise is a viable option, I was wondering how I would go about creating a 3d dimensional noise function, something akin to getValue( x, y, time ), so that I could actually have what resembles animated realtime clouds. There does not seem to much material on net about implementing animated clouds except that which mentions it can be done.

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Oddly enough, I just implemented that today in my own terrain engine, but I stayed with 2D noise.

I found that by using a tileable perlin texture I could just change the origin of the noise by 10 pixels or so (in the direction of my wind) and it makes a good changing cloud animation. The clouds grow/shrink/appear over time and its all just 2D noise translating over time.

My problem is making it fast enough...with a 256x256 cloud texture, I can only do about 4 lines of the texture per frame.

Hope that helps anyways...


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