protected void SerializeFriction(BitStream stream, MyEntity entity)
        {
            MyPhysicsBody pb = entity.Physics as MyPhysicsBody;
            if (pb == null || pb.RigidBody == null)
            {
                if (stream.Writing)
                    stream.WriteFloat(0);
                else
                    stream.ReadFloat();
                return;
            }
            HkRigidBody rb = pb.RigidBody;

            if (stream.Writing)
                stream.WriteFloat(rb.Friction);
            else
                rb.Friction = stream.ReadFloat();
        }
        private void SerializeRopeData(BitStream stream, bool applyWhenReading, List<MyCubeGrid> gridsGroup = null)
        {
            if (MyRopeComponent.Static == null)
                return;

            if (stream.Writing)
            {
                m_tmpRopes.Clear();
                m_tmpRopeGrids.Clear();

                m_tmpRopeGrids.Add(Entity);
                Debug.Assert(gridsGroup != null);
                if (gridsGroup != null) 
                {
                    foreach (var grid in gridsGroup)
                        m_tmpRopeGrids.Add(grid);
                }

                MyRopeComponent.Static.GetRopesForGrids(m_tmpRopeGrids, m_tmpRopes);

                MyRopeData ropeData;

                stream.WriteUInt16((ushort)m_tmpRopes.Count);
                foreach (var rope in m_tmpRopes)
                {
                    var ropeProxyTarget = MyMultiplayer.Static.ReplicationLayer.GetProxyTarget((IMyEventProxy)rope);
                    NetworkId ropeNetworkId = MyMultiplayer.Static.ReplicationLayer.GetNetworkIdByObject(ropeProxyTarget);
                    stream.WriteNetworkId(ropeNetworkId);

                    //TODO - MyRopeComponent should be rewritten to singleton
                    MyRopeComponent.GetRopeData(rope.EntityId, out ropeData);
                    stream.WriteFloat(ropeData.CurrentRopeLength);
                }

                m_tmpRopes.Clear();
                m_tmpRopeGrids.Clear();
            }
            else
            {
                uint ropesCount = stream.ReadUInt16();
                for (uint i = 0; i < ropesCount; ++i)
                {
                    NetworkId ropeNetworkId = stream.ReadNetworkId();
                    float ropeLength = stream.ReadFloat();

                    MyRopeReplicable replicable = MyMultiplayer.Static.ReplicationLayer.GetObjectByNetworkId(ropeNetworkId) as MyRopeReplicable;
                    MyRope rope = replicable != null ? replicable.Instance : null;

                    if (rope != null && applyWhenReading)
                        MyRopeComponent.Static.SetRopeLengthSynced(rope.EntityId, ropeLength);
                }
            }

        }
        public override bool Serialize(BitStream stream, EndpointId forClient,uint timeStamp, byte packetId, int maxBitPosition)
        {
            base.Serialize(stream, forClient,timeStamp, packetId, maxBitPosition);

            if (stream.Writing)
            {
                // Head and spine stuff, 36 - 152b (4.5B - 19 B)
                stream.WriteHalf(Entity.HeadLocalXAngle); // 2B
                stream.WriteHalf(Entity.HeadLocalYAngle); // 2B

                // TODO: Spine has only one angle (bending forward backward)
                // Getting EULER angles from Matrix seems good way to get it (z-component)
                stream.WriteQuaternionNormCompressedIdentity(Entity.GetAdditionalRotation(Entity.Definition.SpineBone)); // 1b / 30b
                stream.WriteQuaternionNormCompressedIdentity(Entity.GetAdditionalRotation(Entity.Definition.HeadBone)); // 1b / 30b

                // Movement state, 2B
                stream.WriteUInt16((ushort)Entity.GetCurrentMovementState());
                // Movement flag.
                stream.WriteUInt16((ushort)Entity.MovementFlags);

                // Flags, 6 bits
                bool hasJetpack = Entity.JetpackComp != null;
                stream.WriteBool(hasJetpack ? Entity.JetpackComp.TurnedOn : false);
                stream.WriteBool(hasJetpack ? Entity.JetpackComp.DampenersTurnedOn : false);
                stream.WriteBool(Entity.LightEnabled); // TODO: Remove
                stream.WriteBool(Entity.ZoomMode == MyZoomModeEnum.IronSight);
                stream.WriteBool(Entity.RadioBroadcaster.WantsToBeEnabled); // TODO: Remove
                stream.WriteBool(Entity.TargetFromCamera);

                stream.WriteNormalizedSignedVector3(Entity.MoveIndicator, 8);

                float speed = Entity.Physics.CharacterProxy != null ? Entity.Physics.CharacterProxy.Speed : 0.0f;
                stream.WriteFloat(speed);

                stream.WriteFloat(Entity.RotationIndicator.X);
                stream.WriteFloat(Entity.RotationIndicator.Y);
                stream.WriteFloat(Entity.RollIndicator);

            }
            else
            {
                Vector3 move;
                MyCharacterNetState charNetState = ReadCharacterState(stream);

                if (!IsControlledLocally && !Entity.Closed)
                {
                   Entity.SetStateFromNetwork(ref charNetState);
                }
            }
            return true;
        }