Attached Link: http://www.markmark.net/clouds/index.html

Link to Researcher Mark Harris's "SKYWORKS" page. The demo is quite old by Flight Sim software standards- like MS Flight Simulator 2004 which uses a more advanced modeling technique (but based upon Harris's ideas-among others.)

But it shows how Procedural Clouds can be mapped REAL-TIME onto Camera Facing Bill Boards at rates up to 60 Frames Per Second...

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Exploding STAR EFX from "SWELL" software...