Constraint3D

描述：

  A two-body constraint owned by a PhysicsWorld3D.

world

类型： 只读成员变量。

描述：

  The owning world. Nil after the constraint is destroyed.

签名：

const world: PhysicsWorld3D | nil
	-- The first constrained body. Nil after the constraint is destroyed.
	const firstBody: Body3D | nil
	-- The second constrained body. Nil after the constraint is destroyed.
	const secondBody: Body3D | nil

destroy

类型： 函数。

描述：

  Removes the constraint from its world and turns this into an empty object.

签名：

destroy: function(self: Constraint3D)