Cycles.
Insydium LTD. have ported Blender's Cycles over to Cinema 4D.
It’s too fucking rad. I am going to miss all my deadlines this week.
Black sperm courtesy of Entagma's Reaction diffusion tutorials:
http://www.entagma.com/houdini-true-3d-reaction-diffusion/
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Cycles demo plus scene files (not they left render settings SUPER low for their examples)