ray marching technique for procedural hieght field rendering based heavily on http://iquilezles.org/www/articles/terrainmarching/terrainmarching.htm with extra optimizations from 'procedural texturing and modeling' book.
Controls
Click to select scene, then click on icon in top corner to return to selection scene.
use mouse to look around
cursor keys to move about
Click and drag the sun to change day time and lighting.
'h' for High quality mode ( 5X supersampling)
'C' to add clouds.
's' to save info for current view and scene.
'r' to randomize scene
'w'
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