//called by Physics World just before rigid body is added to world.
//the current rigid body properties are used to rebuild the rigid body.
internal override bool _BuildCollisionObject()
{
BPhysicsWorld world = BPhysicsWorld.Get;
if (m_rigidBody != null && isInWorld && world != null)
{
isInWorld = false;
world.RemoveRigidBody(m_rigidBody);
}
m_collisionShape = this.GetParent <Unit>().GetComponent <BCollisionShape>().baseBCollisionShape; //必须在这里另外赋值，这个是最重要的组件。基本都用到它。
if (m_collisionShape == null)
{
Log.Warning("There was no collision shape component attached to this BRigidBody. {0}");
return(false);
}
CollisionShape cs = this.GetParent <Unit>().GetComponent <BCollisionShape>().GetCollisionShape;
if (m_motionState == null)
{
m_motionState = new BGameObjectMotionState(this._Unit, this._Unit.Position, this._Unit.Quaternion);//创建MotionState，没有就无法更新状态。
}
BulletSharp.RigidBody rb = (BulletSharp.RigidBody)m_collisionObject;
CreateOrConfigureRigidBody(ref rb, ref _localInertia, cs, m_motionState);
m_collisionObject = rb;
m_collisionObject.UserObject = this.GetParent <Unit>();//这里就是碰撞检测等传递的对象。如果想不用unit，可以在这里改。
return(true);
}
protected override void RemoveObjectFromBulletWorld()
{
BPhysicsWorld pw = BPhysicsWorld.Get;
if (pw != null && m_rigidBody != null && isInWorld)
{
// Debug.Assert(m_rigidBody.NumConstraintRefs == 0, "Removing rigid body that still had constraints. Remove constraints first.");
//constraints must be removed before rigid body is removed
pw.RemoveRigidBody((RigidBody)m_collisionObject);
}
}