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What I intend to do here is figure out a way to roughly model the results of planetary (or larger) bodies impacting, or a planetary (or larger) sized body being impacted by a smaller body that is moving with enough relative velocity as to have an effect other than leaving an amusing crater.

...Now let me give an example, as I am horrible at explaining things:

Say you have a earth or mars sized planet, and an asteroid impacts it. From the impact, you can get the velocity (and thus momentum) of each object in regards to the other, point of impact on each (Each object is a perfect sphere being extrapolated as a circle with the radius of the sphere for the purposes of the simulation, so you will just get a value describing the impact point as the number of degrees off of the "bearing" of the body, which is a bit arbitrary to be honest. Either way, point of impact and the velocity.) as well as the densities of each object (assumed continuous throughout for simplicity) and the positions the objects were in when they collided (cartesian co-ordinate system).

From this, I am looking to be able to produce a beleivable result of the "impact" that occured between the bodies.

Any thoughts as to how I should go about this? These impacts will vary anywhere from a space ship impacting a planet at relativistic speeds to an asteroid smashing into a gas giant. Thanks in advance!