Bullet User Manual 第一部分，参见 bullet3/docs/Bullet_User_Manual.pdf
总体上概述了 Bullet 物理引擎的功能及特征。
Bullet 物理引擎主要用于游戏、视觉效果仿真、机器人仿真等。
The library is primarily designed for use in games, visual effects and robotic simulation.
Bullet 物理引擎的主要特征/功能有：
离散/连续碰撞检测 Discrete and continuous collision detection
Discrete and continuous collision detection including ray and convex sweep test. Collision shapes include concave and convex meshes and all basic primitives
刚体仿真
Maximal coordinate 6-degree of freedom rigid bodies (btRigidBody) connected by constraints (btTypedConstraint) as well as generalized coordinate multi-bodies (btMultiBody) connected by mobilizers using the articulated body algorithm.
约束求解等
Fast and stable rigid body dynamics constraint solver, vehicle dynamics, character controller and slider, hinge, generic 6DOF and cone twist constraint for ragdolls
软体形变仿真 Soft Body
Soft Body dynamics for cloth, rope and deformable volumes with two-way interaction with rigid bodies, including constraint support
其他
Bullet 学习笔记之 Bullet User Manual - 1 Introduction
原文：https://www.cnblogs.com/wghou09/p/12813947.html