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Simple Raymarcher

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an implementation of this code. http://code4k.blogspot.com/2009/10/potatro-and-raymarching-story-of.html Casts a vector through a screen, and then moves the vector forward until it hits the sphere in the scene. The cool optimization is that it first tests the distance to the surface of the sphere, and then moves the cast vector that far forward. This allows the depth test to be jumped forward rather than slowly moved forward. This method is used a bunch for 4k demos
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