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：
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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