At a glance: CASCADES
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This is an advanced graphics demo I wrote at Nvidia for the GeForce 8800, where you can build your own waterfalls (CTRL+click) and watch them cascade down an endless, procedurally-generated, richly-shaded rock structure.
If you want to know how the special effects were done, check out the slides from our talk at GDC ('NVIDIA Demo Team Secrets - Cascades') (+bonus video describing the water billboards). Or for a quick overview, check out a brief blog entry I made about the demo.
Requires Windows Vista and a GeForce 8-series or later.
By the way, there is an easter egg in the demo: you can turn on some very cool branching vines by editing the file "bin\args.txt". :)