Bullet is an open-source physics engine which was integrated with the release of Poser 10 and Poser Pro 2014. It allows us to use soft and rigid body dynamics in our scenes.
Rigid bodies are solid objects that do not deform when they collide with other objects. Think of bowling pins that are hit by a ball. Soft bodies on the other hand deform upon impact, like cloth or rubber.
I had always assumed that Bullet Physics has something to do with projectiles being fired from guns, perhaps for use in game engines. Turns out that it’s just the name of the engine itself, which is also part of many other 3D applications like Blender.
Here’s a quick overview on how to use this thing in Poser.