I'm having some trouble doing collision detection with small objects. I have nice thick static platforms and I'd like to test bullet casings against them, but the majority of the casings just fall through the floor. Some of them even land, stop, and then fall
again. Others land on the inside of the bottom of the platform. Because the casings are small I expect that the floor's vertices rarely fall inside, but the casing moves slowly enough that its vertices are definitely falling inside the floor. They even fall
through rectangular platforms, where the grid should be able to tell perfectly whether a point is inside or not. Does anybody have any ideas what my problem might be?