Modeling of trees
Computer simulation of branching patterns has a relatively long history. The first model was proposed by Ulam , (see also [138, pages 127–131]), and employed the concept of cellular automata that had been developed earlier by von Neumann and Ulam . The branching pattern is created iteratively, starting with a single colored cell in a triangular grid, then coloring cells that touch one and only one vertex of a cell colored in the previous iteration step.
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