By using ray tracing to simulate multiple reflections of light rays between spheres with their centers at the vertices of a regular tetrahedron, fractal images can be produced that simulate, for artistic purposes, a number of phenomena. These include the Sierpinski gasket, an explosion, sea anemones, and a sunset.
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Suffern, K. Ray tracing four spheres at the vertices of a regular tetrahedron. Visual Comp 16, 379–385 (2000). https://doi.org/10.1007/PL00013397
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DOI: https://doi.org/10.1007/PL00013397