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Falling Sand

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Another particle simulation ! New : use the mouse (see below) to draw your own obstacles. I use a grid to speed up the search for neighbors, and precompute a sort of distance field for the collisions with the shapes. Keys : '0' to '9' to choose a predefined shape space bar to reset the particles backspace to toggle the bottom border mouse click to activate the mouse repulsion shift + mouse click to draw control + mouse click to erase
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