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TorusMapping

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Paul
Hertz
This applet demonstrates a fast algorithm for finding shortest line between two points on a torus. It is useful When the display is mapped to a torus, What goes off the top reappears on the bottom, what leaves by the right edge comes back from the left edge, and so on. Drag the red and green points around the central rectangle to see the algorithm in action. See http://www.openprocessing.org/sketch/57263 TurtleBoidSandbox2, which steeers "boids" around a torus topology.
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