Take the tour ×  so I've been searching google for how to do
this, but all anyone seems to care about is collision detection
=p, and no results come close to teaching me how to calculate 2d
elastic collision between two concave polygons.  I know how to
solve elastic collisions between two 2d circles, but I can't
find anything more complicated than that.  I'm also a very
visual person, so it would be great if someone could show me how
to do this or point me to a website! Thanks =)  share|improve
this question The not-very-helpful answer is "you conserve
momentum, energy, and angular momentum". I don't think anyone is
going to offer a general solution because "concave polygons" are
a huge and varied set and collisions between them is a even
bigger set. Too many different possibilities. –  dmckee Sep 24
'11 at 15:53 This is really two separate (hard) problems. One is
that of finding the contact point on two moving (possibly)
concave polygons, the other is computing the (or really, "a")
physically correct impulse