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A raymarched heightmap terrain with dynamic lighting and shadowcasting using Pixel Bender in a swf running on GPU in Joa Ebert's JITB, done as a proof of concept for Flash on the Beach.
The frame rate is actually much better than the video, but this + screen capture wasn't the best idea!
Credits:
JITB: Joa Ebert (blog.joa-ebert.com)
Raymarching code: David Lenaerts (derschmale.com)
Based on: iquilezles.org/www/articles/terrainmarching/terrainmarching.htm