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    <p>While thomas's collision is a good, simple elastic collision equation, at scales of planetary bodies, there is no such thing as an elastic collision. Or, should I say, the planets themselves don't collide elastically. Instead of thinking of planets as if they were big bouncy balls, a more accurate analogy is thinking of them as if they were big <a href="http://www.youtube.com/watch?v=cNI-LIVs-to" rel="nofollow">droplets of water</a>. While not completely identical, there is a lot of similarity between water drops and planets in the way they interact when they collide.</p> <p>A good, quick illustration of the math that will produce that kind of result can be seen <a href="http://www.openprocessing.org/sketch/65193" rel="nofollow">here</a>. While that simulation is not specific to celestial bodies, the basic principles behind the 'squishy' collisions still applies.</p> <p>I also made a version of it for myself with different simulation parameters, complete with tectonic activity and volcanoes, though no universal gravity, (made it lag too much - all I have is a gravity well in the center) so it won't form any large moons. You can download it to examine/play with <a href="https://www.dropbox.com/sh/su0gitznlhfsewa/jTF96-BiqU" rel="nofollow">here</a>, if you want (you can use the mouse to grab chunks of the planet to throw at it; <kbd>g</kbd> turns the gravity well on/off). Keep in mind that those "comets" orbiting the planet that forms in the center are <em>huge</em>. If the planet was the size of earth, those comets would be around the size of texas at least.</p> <p>While both of the simulations I linked to were written in java, the same math and physics can be applied in any language.</p>
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    1. POCollision equation for two 3d objects
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    1. COHey man, thanks a lot for the answer, the few times I've used this site I've been surprised by how helpful you guys are on here ;D This is more of a personal project so the elastic collisions should be all right for now (maybe I'll do something more fancy once I actually get it working), but yeah, the dough thing is pretty cool along with his other projects, and your one is decent as well, you should have left in the option to have universal gravity though :) I'll come back and look at the code once I get a better understanding of java and that lot, just a bit over my head currently aha
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    2. CO@Peter I actually tried to implement universal gravity in it (the original dough didn't have it), but for some reason no matter how I did it, it didn't seem to be able to work. I have no idea why it didn't like it though. Even probabilistic gravitation (for each point, pick another point at random and tug the first point toward it) made it break. Couldn't figure out how to get rid of the bounding box at the edge of the screen, either, for similar reasons.
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