Mirror/Unity-Technologies-networking/Runtime/NetworkTransform.cs

#if ENABLE_UNET
using System;
using UnityEngine;
using UnityEngine.Networking.NetworkSystem;

namespace UnityEngine.Networking
{
    [DisallowMultipleComponent]
    [AddComponentMenu("Network/NetworkTransform")]
    public class NetworkTransform : NetworkBehaviour
    {
        public enum TransformSyncMode
        {
            SyncNone = 0,
            SyncTransform = 1,
            SyncRigidbody2D = 2,
            SyncRigidbody3D = 3,
            SyncCharacterController = 4
        }

        public enum AxisSyncMode
        {
            None,
            AxisX,
            AxisY,
            AxisZ,
            AxisXY,
            AxisXZ,
            AxisYZ,
            AxisXYZ
        }

        public enum CompressionSyncMode
        {
            None,
            Low,
            High
        }

        public delegate bool ClientMoveCallback3D(ref Vector3 position, ref Vector3 velocity, ref Quaternion rotation);
        public delegate bool ClientMoveCallback2D(ref Vector2 position, ref Vector2 velocity, ref float rotation);

        [SerializeField] TransformSyncMode  m_TransformSyncMode = TransformSyncMode.SyncNone;
        [SerializeField] float              m_SendInterval = 0.1f;
        [SerializeField] AxisSyncMode       m_SyncRotationAxis = AxisSyncMode.AxisXYZ;
        [SerializeField] CompressionSyncMode m_RotationSyncCompression = CompressionSyncMode.None;
        [SerializeField] bool               m_SyncSpin;
        [SerializeField] float              m_MovementTheshold = 0.001f;
        [SerializeField] float              m_VelocityThreshold = 0.0001f;

        [SerializeField] float              m_SnapThreshold = 5.0f;
        [SerializeField] float              m_InterpolateRotation = 1.0f;
        [SerializeField] float              m_InterpolateMovement = 1.0f;
        [SerializeField] ClientMoveCallback3D m_ClientMoveCallback3D;
        [SerializeField] ClientMoveCallback2D m_ClientMoveCallback2D;

        Rigidbody       m_RigidBody3D;
        Rigidbody2D     m_RigidBody2D;
        CharacterController m_CharacterController;
        bool m_Grounded = true;

        // movement smoothing

        Vector3         m_TargetSyncPosition;
        Vector3         m_TargetSyncVelocity;

        Vector3         m_FixedPosDiff;

        Quaternion      m_TargetSyncRotation3D;
        Vector3         m_TargetSyncAngularVelocity3D;

        float           m_TargetSyncRotation2D;
        float           m_TargetSyncAngularVelocity2D;

        float           m_LastClientSyncTime; // last time client received a sync from server
        float           m_LastClientSendTime; // last time client send a sync to server

        Vector3         m_PrevPosition;
        Quaternion      m_PrevRotation;
        float           m_PrevRotation2D;
        float           m_PrevVelocity;

        const float     k_LocalMovementThreshold = 0.00001f;
        const float     k_LocalRotationThreshold = 0.00001f;
        const float     k_LocalVelocityThreshold = 0.00001f;
        const float     k_MoveAheadRatio = 0.1f;

        // settings

        public TransformSyncMode    transformSyncMode { get { return m_TransformSyncMode; } set { m_TransformSyncMode = value; } }
        public float                sendInterval { get { return m_SendInterval; } set { m_SendInterval = value; } }
        public AxisSyncMode         syncRotationAxis { get { return m_SyncRotationAxis; } set { m_SyncRotationAxis = value; } }
        public CompressionSyncMode  rotationSyncCompression { get { return m_RotationSyncCompression; } set { m_RotationSyncCompression = value; } }
        public bool                 syncSpin { get { return m_SyncSpin; }  set { m_SyncSpin = value; } }
        public float                movementTheshold { get { return m_MovementTheshold; } set { m_MovementTheshold = value; } }
        public float                velocityThreshold { get { return m_VelocityThreshold; } set { m_VelocityThreshold = value; } }
        public float                snapThreshold { get { return m_SnapThreshold; } set { m_SnapThreshold = value; } }
        public float                interpolateRotation { get { return m_InterpolateRotation; } set { m_InterpolateRotation = value; } }
        public float                interpolateMovement { get { return m_InterpolateMovement; } set { m_InterpolateMovement = value; } }
        public ClientMoveCallback3D clientMoveCallback3D { get { return m_ClientMoveCallback3D; } set { m_ClientMoveCallback3D = value; } }
        public ClientMoveCallback2D clientMoveCallback2D { get { return m_ClientMoveCallback2D; } set { m_ClientMoveCallback2D = value; } }

        // runtime data

        public CharacterController  characterContoller { get { return m_CharacterController; } }
        public Rigidbody            rigidbody3D { get { return m_RigidBody3D; } }
#if !PLATFORM_WINRT
        new
#endif
        public Rigidbody2D          rigidbody2D { get { return m_RigidBody2D; } }
        public float                lastSyncTime { get { return m_LastClientSyncTime; } }
        public Vector3              targetSyncPosition { get { return m_TargetSyncPosition; } }
        public Vector3              targetSyncVelocity { get { return m_TargetSyncVelocity; } }
        public Quaternion           targetSyncRotation3D { get { return m_TargetSyncRotation3D; } }
        public float                targetSyncRotation2D { get { return m_TargetSyncRotation2D; } }
        public bool                 grounded { get { return m_Grounded; } set { m_Grounded = value; } }

        void OnValidate()
        {
            if (m_TransformSyncMode < TransformSyncMode.SyncNone || m_TransformSyncMode > TransformSyncMode.SyncCharacterController)
            {
                m_TransformSyncMode = TransformSyncMode.SyncTransform;
            }

            if (m_SendInterval < 0)
            {
                m_SendInterval = 0;
            }

            if (m_SyncRotationAxis < AxisSyncMode.None || m_SyncRotationAxis > AxisSyncMode.AxisXYZ)
            {
                m_SyncRotationAxis = AxisSyncMode.None;
            }

            if (m_MovementTheshold < 0)
            {
                m_MovementTheshold = 0.00f;
            }

            if (m_VelocityThreshold < 0)
            {
                m_VelocityThreshold = 0.00f;
            }

            if (m_SnapThreshold < 0)
            {
                m_SnapThreshold = 0.01f;
            }

            if (m_InterpolateRotation < 0)
            {
                m_InterpolateRotation = 0.01f;
            }

            if (m_InterpolateMovement < 0)
            {
                m_InterpolateMovement  = 0.01f;
            }
        }

        void Awake()
        {
            m_RigidBody3D = GetComponent<Rigidbody>();
            m_RigidBody2D = GetComponent<Rigidbody2D>();
            m_CharacterController = GetComponent<CharacterController>();
            m_PrevPosition = transform.position;
            m_PrevRotation = transform.rotation;
            m_PrevVelocity = 0;
        }

        public override void OnStartServer()
        {
            m_LastClientSyncTime = 0;
        }

        public override bool OnSerialize(NetworkWriter writer, bool initialState)
        {
            if (initialState)
            {
                // always write initial state, no dirty bits
            }
            else if (syncVarDirtyBits == 0)
            {
                writer.WritePackedUInt32(0);
                return false;
            }
            else
            {
                // dirty bits
                writer.WritePackedUInt32(1);
            }

            switch (transformSyncMode)
            {
                case TransformSyncMode.SyncNone:
                {
                    return false;
                }
                case TransformSyncMode.SyncTransform:
                {
                    SerializeModeTransform(writer);
                    break;
                }
                case TransformSyncMode.SyncRigidbody3D:
                {
                    SerializeMode3D(writer);
                    break;
                }
                case TransformSyncMode.SyncRigidbody2D:
                {
                    SerializeMode2D(writer);
                    break;
                }
                case TransformSyncMode.SyncCharacterController:
                {
                    SerializeModeCharacterController(writer);
                    break;
                }
            }
            return true;
        }

        void SerializeModeTransform(NetworkWriter writer)
        {
            // position
            writer.Write(transform.position);

            // no velocity

            // rotation
            if (m_SyncRotationAxis != AxisSyncMode.None)
            {
                SerializeRotation3D(writer, transform.rotation, syncRotationAxis, rotationSyncCompression);
            }

            // no spin

            m_PrevPosition = transform.position;
            m_PrevRotation = transform.rotation;
            m_PrevVelocity = 0;
        }

        void VerifySerializeComponentExists()
        {
            bool throwError = false;
            Type componentMissing = null;

            switch (transformSyncMode)
            {
                case TransformSyncMode.SyncCharacterController:
                    if (!m_CharacterController && !(m_CharacterController = GetComponent<CharacterController>()))
                    {
                        throwError = true;
                        componentMissing = typeof(CharacterController);
                    }
                    break;

                case TransformSyncMode.SyncRigidbody2D:
                    if (!m_RigidBody2D && !(m_RigidBody2D = GetComponent<Rigidbody2D>()))
                    {
                        throwError = true;
                        componentMissing = typeof(Rigidbody2D);
                    }
                    break;

                case TransformSyncMode.SyncRigidbody3D:
                    if (!m_RigidBody3D && !(m_RigidBody3D = GetComponent<Rigidbody>()))
                    {
                        throwError = true;
                        componentMissing = typeof(Rigidbody);
                    }
                    break;
            }

            if (throwError && componentMissing != null)
            {
                throw new InvalidOperationException(string.Format("transformSyncMode set to {0} but no {1} component was found, did you call NetworkServer.Spawn on a prefab?", transformSyncMode, componentMissing.Name));
            }
        }

        void SerializeMode3D(NetworkWriter writer)
        {
            VerifySerializeComponentExists();

            if (isServer && m_LastClientSyncTime != 0)
            {
                // target position
                writer.Write(m_TargetSyncPosition);

                // target velocity
                SerializeVelocity3D(writer, m_TargetSyncVelocity, CompressionSyncMode.None);

                if (syncRotationAxis != AxisSyncMode.None)
                {
                    // target rotation
                    SerializeRotation3D(writer, m_TargetSyncRotation3D, syncRotationAxis, rotationSyncCompression);
                }
            }
            else
            {
                // current position
                writer.Write(m_RigidBody3D.position);

                // current velocity
                SerializeVelocity3D(writer, m_RigidBody3D.velocity, CompressionSyncMode.None);

                if (syncRotationAxis != AxisSyncMode.None)
                {
                    // current rotation
                    SerializeRotation3D(writer, m_RigidBody3D.rotation, syncRotationAxis, rotationSyncCompression);
                }
            }

            // spin
            if (m_SyncSpin)
            {
                SerializeSpin3D(writer, m_RigidBody3D.angularVelocity, syncRotationAxis, rotationSyncCompression);
            }

            m_PrevPosition = m_RigidBody3D.position;
            m_PrevRotation = transform.rotation;
            m_PrevVelocity = m_RigidBody3D.velocity.sqrMagnitude;
        }

        void SerializeModeCharacterController(NetworkWriter writer)
        {
            VerifySerializeComponentExists();

            if (isServer && m_LastClientSyncTime != 0)
            {
                // target position
                writer.Write(m_TargetSyncPosition);

                // no velocity

                if (syncRotationAxis != AxisSyncMode.None)
                {
                    // target rotation
                    SerializeRotation3D(writer, m_TargetSyncRotation3D, syncRotationAxis, rotationSyncCompression);
                }
            }
            else
            {
                // current position
                writer.Write(transform.position);

                // no velocity

                if (syncRotationAxis != AxisSyncMode.None)
                {
                    // current rotation
                    SerializeRotation3D(writer, transform.rotation, syncRotationAxis, rotationSyncCompression);
                }
            }

            // no spin

            m_PrevPosition = transform.position;
            m_PrevRotation = transform.rotation;
            m_PrevVelocity = 0;
        }

        void SerializeMode2D(NetworkWriter writer)
        {
            VerifySerializeComponentExists();

            if (isServer && m_LastClientSyncTime != 0)
            {
                // target position
                writer.Write((Vector2)m_TargetSyncPosition);

                // target velocity
                SerializeVelocity2D(writer, m_TargetSyncVelocity, CompressionSyncMode.None);

                // target rotation
                if (syncRotationAxis != AxisSyncMode.None)
                {
                    float orientation = m_TargetSyncRotation2D % 360;
                    if (orientation < 0) orientation += 360;
                    SerializeRotation2D(writer, orientation, rotationSyncCompression);
                }
            }
            else
            {
                // current position
                writer.Write(m_RigidBody2D.position);

                // current velocity
                SerializeVelocity2D(writer, m_RigidBody2D.velocity, CompressionSyncMode.None);

                // current rotation
                if (syncRotationAxis != AxisSyncMode.None)
                {
                    float orientation = m_RigidBody2D.rotation % 360;
                    if (orientation < 0) orientation += 360;
                    SerializeRotation2D(writer, orientation, rotationSyncCompression);
                }
            }

            // spin
            if (m_SyncSpin)
            {
                SerializeSpin2D(writer, m_RigidBody2D.angularVelocity, rotationSyncCompression);
            }

            m_PrevPosition = m_RigidBody2D.position;
            m_PrevRotation = transform.rotation;
            m_PrevVelocity = m_RigidBody2D.velocity.sqrMagnitude;
        }

        public override void OnDeserialize(NetworkReader reader, bool initialState)
        {
            if (isServer && NetworkServer.localClientActive)
                return;

            if (!initialState)
            {
                if (reader.ReadPackedUInt32() == 0)
                    return;
            }

            switch (transformSyncMode)
            {
                case TransformSyncMode.SyncNone:
                {
                    return;
                }
                case TransformSyncMode.SyncTransform:
                {
                    UnserializeModeTransform(reader, initialState);
                    break;
                }
                case TransformSyncMode.SyncRigidbody3D:
                {
                    UnserializeMode3D(reader, initialState);
                    break;
                }
                case TransformSyncMode.SyncRigidbody2D:
                {
                    UnserializeMode2D(reader, initialState);
                    break;
                }
                case TransformSyncMode.SyncCharacterController:
                {
                    UnserializeModeCharacterController(reader, initialState);
                    break;
                }
            }
            m_LastClientSyncTime = Time.time;
        }

        void UnserializeModeTransform(NetworkReader reader, bool initialState)
        {
            if (hasAuthority)
            {
                // this component must read the data that the server wrote, even if it ignores it.
                // otherwise the NetworkReader stream will still contain that data for the next component.

                // position
                reader.ReadVector3();

                if (syncRotationAxis != AxisSyncMode.None)
                {
                    UnserializeRotation3D(reader, syncRotationAxis, rotationSyncCompression);
                }
                return;
            }

            if (isServer && m_ClientMoveCallback3D != null)
            {
                var pos = reader.ReadVector3();
                var vel = Vector3.zero;
                var rot = Quaternion.identity;
                if (syncRotationAxis != AxisSyncMode.None)
                {
                    rot = UnserializeRotation3D(reader, syncRotationAxis, rotationSyncCompression);
                }

                if (m_ClientMoveCallback3D(ref pos, ref vel, ref rot))
                {
                    transform.position = pos;
                    if (syncRotationAxis != AxisSyncMode.None)
                    {
                        transform.rotation = rot;
                    }
                }
                else
                {
                    // rejected by callback
                    return;
                }
            }
            else
            {
                // position
                transform.position = reader.ReadVector3();

                // no velocity

                // rotation
                if (syncRotationAxis != AxisSyncMode.None)
                {
                    transform.rotation = UnserializeRotation3D(reader, syncRotationAxis, rotationSyncCompression);
                }

                // no spin
            }
        }

        void UnserializeMode3D(NetworkReader reader, bool initialState)
        {
            if (hasAuthority)
            {
                // this component must read the data that the server wrote, even if it ignores it.
                // otherwise the NetworkReader stream will still contain that data for the next component.

                // position
                reader.ReadVector3();

                // velocity
                reader.ReadVector3();

                if (syncRotationAxis != AxisSyncMode.None)
                {
                    UnserializeRotation3D(reader, syncRotationAxis, rotationSyncCompression);
                }
                if (syncSpin)
                {
                    UnserializeSpin3D(reader, syncRotationAxis, rotationSyncCompression);
                }
                return;
            }

            if (isServer && m_ClientMoveCallback3D != null)
            {
                var pos = reader.ReadVector3();
                var vel = reader.ReadVector3();
                Quaternion rot = Quaternion.identity;
                if (syncRotationAxis != AxisSyncMode.None)
                {
                    rot = UnserializeRotation3D(reader, syncRotationAxis, rotationSyncCompression);
                }

                if (m_ClientMoveCallback3D(ref pos, ref vel, ref rot))
                {
                    m_TargetSyncPosition = pos;
                    m_TargetSyncVelocity = vel;
                    if (syncRotationAxis != AxisSyncMode.None)
                    {
                        m_TargetSyncRotation3D = rot;
                    }
                }
                else
                {
                    // rejected by callback
                    return;
                }
            }
            else
            {
                // position
                m_TargetSyncPosition = reader.ReadVector3();

                // velocity
                m_TargetSyncVelocity = reader.ReadVector3();

                // rotation
                if (syncRotationAxis != AxisSyncMode.None)
                {
                    m_TargetSyncRotation3D = UnserializeRotation3D(reader, syncRotationAxis, rotationSyncCompression);
                }
            }
            // spin
            if (syncSpin)
            {
                m_TargetSyncAngularVelocity3D = UnserializeSpin3D(reader, syncRotationAxis, rotationSyncCompression);
            }

            if (m_RigidBody3D == null)
                return;

            if (isServer && !isClient)
            {
                // dedicated server needs to apply immediately, there is no interpolation
                m_RigidBody3D.MovePosition(m_TargetSyncPosition);
                m_RigidBody3D.MoveRotation(m_TargetSyncRotation3D);
                m_RigidBody3D.velocity = m_TargetSyncVelocity;
                return;
            }

            // handle zero send rate
            if (GetNetworkSendInterval() == 0)
            {
                m_RigidBody3D.MovePosition(m_TargetSyncPosition);
                m_RigidBody3D.velocity = m_TargetSyncVelocity;
                if (syncRotationAxis != AxisSyncMode.None)
                {
                    m_RigidBody3D.MoveRotation(m_TargetSyncRotation3D);
                }
                if (syncSpin)
                {
                    m_RigidBody3D.angularVelocity = m_TargetSyncAngularVelocity3D;
                }
                return;
            }

            // handle position snap threshold
            float dist = (m_RigidBody3D.position - m_TargetSyncPosition).magnitude;
            if (dist > snapThreshold)
            {
                m_RigidBody3D.position = m_TargetSyncPosition;
                m_RigidBody3D.velocity = m_TargetSyncVelocity;
            }

            // handle no rotation interpolation
            if (interpolateRotation == 0 && syncRotationAxis != AxisSyncMode.None)
            {
                m_RigidBody3D.rotation = m_TargetSyncRotation3D;
                if (syncSpin)
                {
                    m_RigidBody3D.angularVelocity = m_TargetSyncAngularVelocity3D;
                }
            }

            // handle no movement interpolation
            if (m_InterpolateMovement == 0)
            {
                m_RigidBody3D.position = m_TargetSyncPosition;
            }

            if (initialState && syncRotationAxis != AxisSyncMode.None)
            {
                m_RigidBody3D.rotation = m_TargetSyncRotation3D;
            }
        }

        void UnserializeMode2D(NetworkReader reader, bool initialState)
        {
            if (hasAuthority)
            {
                // this component must read the data that the server wrote, even if it ignores it.
                // otherwise the NetworkReader stream will still contain that data for the next component.

                // position
                reader.ReadVector2();

                // velocity
                reader.ReadVector2();

                if (syncRotationAxis != AxisSyncMode.None)
                {
                    UnserializeRotation2D(reader, rotationSyncCompression);
                }

                if (syncSpin)
                {
                    UnserializeSpin2D(reader, rotationSyncCompression);
                }
                return;
            }

            if (m_RigidBody2D == null)
                return;

            if (isServer && m_ClientMoveCallback2D != null)
            {
                Vector2 pos = reader.ReadVector2();
                Vector2 vel = reader.ReadVector2();
                float rot = 0;
                if (syncRotationAxis != AxisSyncMode.None)
                {
                    rot = UnserializeRotation2D(reader, rotationSyncCompression);
                }

                if (m_ClientMoveCallback2D(ref pos, ref vel, ref rot))
                {
                    m_TargetSyncPosition = pos;
                    m_TargetSyncVelocity = vel;
                    if (syncRotationAxis != AxisSyncMode.None)
                    {
                        m_TargetSyncRotation2D = rot;
                    }
                }
                else
                {
                    // rejected by callback
                    return;
                }
            }
            else
            {
                // position
                m_TargetSyncPosition = reader.ReadVector2();

                // velocity
                m_TargetSyncVelocity = reader.ReadVector2();

                // rotation
                if (syncRotationAxis != AxisSyncMode.None)
                {
                    m_TargetSyncRotation2D = UnserializeRotation2D(reader, rotationSyncCompression);
                }
            }

            // spin
            if (syncSpin)
            {
                m_TargetSyncAngularVelocity2D = UnserializeSpin2D(reader, rotationSyncCompression);
            }

            if (isServer && !isClient)
            {
                // dedicated server needs to apply immediately, there is no interpolation
                transform.position = m_TargetSyncPosition;
                m_RigidBody2D.MoveRotation(m_TargetSyncRotation2D);
                m_RigidBody2D.velocity = m_TargetSyncVelocity;
                return;
            }

            // handle zero send rate
            if (GetNetworkSendInterval() == 0)
            {
                // NOTE: cannot use m_RigidBody2D.MovePosition() and set velocity in the same frame, so use transform.position
                transform.position = m_TargetSyncPosition;
                m_RigidBody2D.velocity = m_TargetSyncVelocity;
                if (syncRotationAxis != AxisSyncMode.None)
                {
                    m_RigidBody2D.MoveRotation(m_TargetSyncRotation2D);
                }
                if (syncSpin)
                {
                    m_RigidBody2D.angularVelocity = m_TargetSyncAngularVelocity2D;
                }
                return;
            }

            // handle position snap threshold
            float dist = (m_RigidBody2D.position - (Vector2)m_TargetSyncPosition).magnitude;
            if (dist > snapThreshold)
            {
                m_RigidBody2D.position = m_TargetSyncPosition;
                m_RigidBody2D.velocity = m_TargetSyncVelocity;
            }

            // handle no rotation interpolation
            if (interpolateRotation == 0 && syncRotationAxis != AxisSyncMode.None)
            {
                m_RigidBody2D.rotation = m_TargetSyncRotation2D;
                if (syncSpin)
                {
                    m_RigidBody2D.angularVelocity = m_TargetSyncAngularVelocity2D;
                }
            }

            // handle no movement interpolation
            if (m_InterpolateMovement == 0)
            {
                m_RigidBody2D.position = m_TargetSyncPosition;
            }

            if (initialState)
            {
                m_RigidBody2D.rotation = m_TargetSyncRotation2D;
            }
        }

        void UnserializeModeCharacterController(NetworkReader reader, bool initialState)
        {
            if (hasAuthority)
            {
                // this component must read the data that the server wrote, even if it ignores it.
                // otherwise the NetworkReader stream will still contain that data for the next component.

                // position
                reader.ReadVector3();

                if (syncRotationAxis != AxisSyncMode.None)
                {
                    UnserializeRotation3D(reader, syncRotationAxis, rotationSyncCompression);
                }
                return;
            }

            if (isServer && m_ClientMoveCallback3D != null)
            {
                var pos = reader.ReadVector3();
                Quaternion rot = Quaternion.identity;
                if (syncRotationAxis != AxisSyncMode.None)
                {
                    rot = UnserializeRotation3D(reader, syncRotationAxis, rotationSyncCompression);
                }

                if (m_CharacterController == null)
                    return;

                // no velocity in packet, use current local velocity
                var vel = m_CharacterController.velocity;

                if (m_ClientMoveCallback3D(ref pos, ref vel, ref rot))
                {
                    m_TargetSyncPosition = pos;
                    m_TargetSyncVelocity = vel;
                    if (syncRotationAxis != AxisSyncMode.None)
                    {
                        m_TargetSyncRotation3D = rot;
                    }
                }
                else
                {
                    // rejected by callback
                    return;
                }
            }
            else
            {
                // position
                m_TargetSyncPosition = reader.ReadVector3();

                // no velocity

                // rotation
                if (syncRotationAxis != AxisSyncMode.None)
                {
                    m_TargetSyncRotation3D = UnserializeRotation3D(reader, syncRotationAxis, rotationSyncCompression);
                }

                // no spin
            }

            if (m_CharacterController == null)
                return;

            // total distance away the target position is
            var totalDistToTarget = (m_TargetSyncPosition - transform.position); // 5 units
            var perSecondDist = totalDistToTarget / GetNetworkSendInterval();
            m_FixedPosDiff = perSecondDist * Time.fixedDeltaTime;

            if (isServer && !isClient)
            {
                // dedicated server needs to apply immediately, there is no interpolation
                transform.position = m_TargetSyncPosition;
                transform.rotation = m_TargetSyncRotation3D;
                return;
            }

            // handle zero send rate
            if (GetNetworkSendInterval() == 0)
            {
                transform.position = m_TargetSyncPosition;
                //m_RigidBody3D.velocity = m_TargetSyncVelocity;
                if (syncRotationAxis != AxisSyncMode.None)
                {
                    transform.rotation = m_TargetSyncRotation3D;
                }
                return;
            }

            // handle position snap threshold
            float dist = (transform.position - m_TargetSyncPosition).magnitude;
            if (dist > snapThreshold)
            {
                transform.position = m_TargetSyncPosition;
            }

            // handle no rotation interpolation
            if (interpolateRotation == 0 && syncRotationAxis != AxisSyncMode.None)
            {
                transform.rotation = m_TargetSyncRotation3D;
            }

            // handle no movement interpolation
            if (m_InterpolateMovement == 0)
            {
                transform.position = m_TargetSyncPosition;
            }

            if (initialState && syncRotationAxis != AxisSyncMode.None)
            {
                transform.rotation = m_TargetSyncRotation3D;
            }
        }

        void FixedUpdate()
        {
            if (isServer)
            {
                FixedUpdateServer();
            }
            if (isClient)
            {
                FixedUpdateClient();
            }
        }

        void FixedUpdateServer()
        {
            if (syncVarDirtyBits != 0)
                return;

            // dont run if network isn't active
            if (!NetworkServer.active)
                return;

            // dont run if we haven't been spawned yet
            if (!isServer)
                return;

            // dont' auto-dirty if no send interval
            if (GetNetworkSendInterval() == 0)
                return;

            float distance = (transform.position - m_PrevPosition).magnitude;
            if (distance < movementTheshold)
            {
                distance = Quaternion.Angle(m_PrevRotation, transform.rotation);
                if (distance < movementTheshold)
                {
                    if (!CheckVelocityChanged())
                    {
                        return;
                    }
                }
            }

            // This will cause transform to be sent
            SetDirtyBit(1);
        }

        bool CheckVelocityChanged()
        {
            switch (transformSyncMode)
            {
                case TransformSyncMode.SyncRigidbody2D:
                    if (m_RigidBody2D && m_VelocityThreshold > 0)
                    {
                        return Mathf.Abs(m_RigidBody2D.velocity.sqrMagnitude - m_PrevVelocity) >= m_VelocityThreshold;
                    }
                    else
                    {
                        return false;
                    }

                case TransformSyncMode.SyncRigidbody3D:
                    if (m_RigidBody3D && m_VelocityThreshold > 0)
                    {
                        return Mathf.Abs(m_RigidBody3D.velocity.sqrMagnitude - m_PrevVelocity) >= m_VelocityThreshold;
                    }
                    else
                    {
                        return false;
                    }

                default:
                    return false;
            }
        }

        void FixedUpdateClient()
        {
            // dont run if we haven't received any sync data
            if (m_LastClientSyncTime == 0)
                return;

            // dont run if network isn't active
            if (!NetworkServer.active && !NetworkClient.active)
                return;

            // dont run if we haven't been spawned yet
            if (!isServer && !isClient)
                return;

            // dont run if not expecting continuous updates
            if (GetNetworkSendInterval() == 0)
                return;

            // dont run this if this client has authority over this player object
            if (hasAuthority)
                return;

            // interpolate on client
            switch (transformSyncMode)
            {
                case TransformSyncMode.SyncNone:
                {
                    return;
                }
                case TransformSyncMode.SyncTransform:
                {
                    return;
                }
                case TransformSyncMode.SyncRigidbody3D:
                {
                    InterpolateTransformMode3D();
                    break;
                }
                case TransformSyncMode.SyncRigidbody2D:
                {
                    InterpolateTransformMode2D();
                    break;
                }

                case TransformSyncMode.SyncCharacterController:
                {
                    InterpolateTransformModeCharacterController();
                    break;
                }
            }
        }

        void InterpolateTransformMode3D()
        {
            if (m_InterpolateMovement != 0)
            {
                Vector3 newVelocity = (m_TargetSyncPosition - m_RigidBody3D.position) * m_InterpolateMovement / GetNetworkSendInterval();
                m_RigidBody3D.velocity = newVelocity;
            }

            if (interpolateRotation != 0)
            {
                m_RigidBody3D.MoveRotation(Quaternion.Slerp(
                        m_RigidBody3D.rotation,
                        m_TargetSyncRotation3D,
                        Time.fixedDeltaTime * interpolateRotation));

                //m_TargetSyncRotation3D *= Quaternion.Euler(m_TargetSyncAngularVelocity3D * Time.fixedDeltaTime);

                // move sync rotation slightly in rotation direction
                //m_TargetSyncRotation3D += (m_TargetSyncAngularVelocity3D * Time.fixedDeltaTime * moveAheadRatio);
            }

            // move sync position slightly in the position of velocity
            m_TargetSyncPosition += (m_TargetSyncVelocity * Time.fixedDeltaTime * k_MoveAheadRatio);
        }

        void InterpolateTransformModeCharacterController()
        {
            if (m_FixedPosDiff == Vector3.zero && m_TargetSyncRotation3D == transform.rotation)
                return;

            if (m_InterpolateMovement != 0)
            {
                m_CharacterController.Move(m_FixedPosDiff * m_InterpolateMovement);
            }

            if (interpolateRotation != 0)
            {
                transform.rotation = Quaternion.Slerp(
                        transform.rotation,
                        m_TargetSyncRotation3D,
                        Time.fixedDeltaTime * interpolateRotation * 10);
            }
            if (Time.time - m_LastClientSyncTime > GetNetworkSendInterval())
            {
                // turn off interpolation if we go out of the time window for a new packet
                m_FixedPosDiff = Vector3.zero;

                var diff = m_TargetSyncPosition - transform.position;
                m_CharacterController.Move(diff);
            }
        }

        void InterpolateTransformMode2D()
        {
            if (m_InterpolateMovement != 0)
            {
                Vector2 oldVelocity = m_RigidBody2D.velocity;
                Vector2 newVelocity = (((Vector2)m_TargetSyncPosition - m_RigidBody2D.position)) * m_InterpolateMovement / GetNetworkSendInterval();
                if (!m_Grounded && newVelocity.y < 0)
                {
                    newVelocity.y = oldVelocity.y;
                }
                m_RigidBody2D.velocity = newVelocity;
            }

            if (interpolateRotation != 0)
            {
                float orientation = m_RigidBody2D.rotation % 360;
                if (orientation < 0)
                {
                    orientation += 360;
                }

                Quaternion newRotation = Quaternion.Slerp(
                        transform.rotation,
                        Quaternion.Euler(0, 0, m_TargetSyncRotation2D),
                        Time.fixedDeltaTime * interpolateRotation / GetNetworkSendInterval());

                m_RigidBody2D.MoveRotation(newRotation.eulerAngles.z);

                // move sync rotation slightly in rotation direction
                m_TargetSyncRotation2D += (m_TargetSyncAngularVelocity2D * Time.fixedDeltaTime * k_MoveAheadRatio);
            }

            // move sync position slightly in the position of velocity
            m_TargetSyncPosition += (m_TargetSyncVelocity * Time.fixedDeltaTime * k_MoveAheadRatio);
        }

        // --------------------- local transform sync  ------------------------

        void Update()
        {
            if (!hasAuthority)
                return;

            if (!localPlayerAuthority)
                return;

            if (NetworkServer.active)
                return;

            if (Time.time - m_LastClientSendTime > GetNetworkSendInterval())
            {
                SendTransform();
                m_LastClientSendTime = Time.time;
            }
        }

        bool HasMoved()
        {
            float diff = 0;

            // check if position has changed
            if (m_RigidBody3D != null)
            {
                diff = (m_RigidBody3D.position - m_PrevPosition).magnitude;
            }
            else if (m_RigidBody2D != null)
            {
                diff = (m_RigidBody2D.position - (Vector2)m_PrevPosition).magnitude;
            }
            else
            {
                diff = (transform.position - m_PrevPosition).magnitude;
            }

            if (diff > k_LocalMovementThreshold)
            {
                return true;
            }

            // check if rotation has changed
            if (m_RigidBody3D != null)
            {
                diff = Quaternion.Angle(m_RigidBody3D.rotation, m_PrevRotation);
            }
            else if (m_RigidBody2D != null)
            {
                diff = Math.Abs(m_RigidBody2D.rotation - m_PrevRotation2D);
            }
            else
            {
                diff = Quaternion.Angle(transform.rotation, m_PrevRotation);
            }
            if (diff > k_LocalRotationThreshold)
            {
                return true;
            }

            // check if velocty has changed
            if (m_RigidBody3D != null)
            {
                diff = Mathf.Abs(m_RigidBody3D.velocity.sqrMagnitude - m_PrevVelocity);
            }
            else if (m_RigidBody2D != null)
            {
                diff = Mathf.Abs(m_RigidBody2D.velocity.sqrMagnitude - m_PrevVelocity);
            }
            if (diff > k_LocalVelocityThreshold)
            {
                return true;
            }


            return false;
        }

        [Client]
        void SendTransform()
        {
            if (!HasMoved() || ClientScene.readyConnection == null)
            {
                return;
            }

            NetworkWriter writer = new NetworkWriter();
            switch (transformSyncMode)
            {
                case TransformSyncMode.SyncNone:
                {
                    return;
                }
                case TransformSyncMode.SyncTransform:
                {
                    SerializeModeTransform(writer);
                    break;
                }
                case TransformSyncMode.SyncRigidbody3D:
                {
                    SerializeMode3D(writer);
                    break;
                }
                case TransformSyncMode.SyncRigidbody2D:
                {
                    SerializeMode2D(writer);
                    break;
                }
                case TransformSyncMode.SyncCharacterController:
                {
                    SerializeModeCharacterController(writer);
                    break;
                }
            }

            if (m_RigidBody3D != null)
            {
                m_PrevPosition = m_RigidBody3D.position;
                m_PrevRotation = m_RigidBody3D.rotation;
                m_PrevVelocity = m_RigidBody3D.velocity.sqrMagnitude;
            }
            else if (m_RigidBody2D != null)
            {
                m_PrevPosition = m_RigidBody2D.position;
                m_PrevRotation2D = m_RigidBody2D.rotation;
                m_PrevVelocity = m_RigidBody2D.velocity.sqrMagnitude;
            }
            else
            {
                m_PrevPosition = transform.position;
                m_PrevRotation = transform.rotation;
            }

            LocalPlayerTransformMessage message = new LocalPlayerTransformMessage();
            message.netId = netId;
            message.payload = writer.ToArray();

#if UNITY_EDITOR
            UnityEditor.NetworkDetailStats.IncrementStat(
                UnityEditor.NetworkDetailStats.NetworkDirection.Outgoing,
                (short)MsgType.LocalPlayerTransform, "6:LocalPlayerTransform", 1);
#endif
            ClientScene.readyConnection.SendByChannel((short)MsgType.LocalPlayerTransform, message, GetNetworkChannel());
        }

        static public void HandleTransform(NetworkMessage netMsg)
        {
            LocalPlayerTransformMessage message = netMsg.ReadMessage<LocalPlayerTransformMessage>();

#if UNITY_EDITOR
            UnityEditor.NetworkDetailStats.IncrementStat(
                UnityEditor.NetworkDetailStats.NetworkDirection.Incoming,
                (short)MsgType.LocalPlayerTransform, "6:LocalPlayerTransform", 1);
#endif

            GameObject foundObj = NetworkServer.FindLocalObject(message.netId);
            if (foundObj == null)
            {
                if (LogFilter.logError) { Debug.LogError("Received NetworkTransform data for GameObject that doesn't exist"); }
                return;
            }
            NetworkTransform foundSync = foundObj.GetComponent<NetworkTransform>();
            if (foundSync == null)
            {
                if (LogFilter.logError) { Debug.LogError("HandleTransform null target"); }
                return;
            }
            if (!foundSync.localPlayerAuthority)
            {
                if (LogFilter.logError) { Debug.LogError("HandleTransform no localPlayerAuthority"); }
                return;
            }
            if (netMsg.conn.clientOwnedObjects == null)
            {
                if (LogFilter.logError) { Debug.LogError("HandleTransform object not owned by connection"); }
                return;
            }

            if (netMsg.conn.clientOwnedObjects.Contains(message.netId))
            {
                NetworkReader reader = new NetworkReader(message.payload);
                switch (foundSync.transformSyncMode)
                {
                    case TransformSyncMode.SyncNone:
                    {
                        return;
                    }
                    case TransformSyncMode.SyncTransform:
                    {
                        foundSync.UnserializeModeTransform(reader, false);
                        break;
                    }
                    case TransformSyncMode.SyncRigidbody3D:
                    {
                        foundSync.UnserializeMode3D(reader, false);
                        break;
                    }
                    case TransformSyncMode.SyncRigidbody2D:
                    {
                        foundSync.UnserializeMode2D(reader, false);
                        break;
                    }
                    case TransformSyncMode.SyncCharacterController:
                    {
                        foundSync.UnserializeModeCharacterController(reader, false);
                        break;
                    }
                }
                foundSync.m_LastClientSyncTime = Time.time;
                return;
            }

            if (LogFilter.logWarn) { Debug.LogWarning("HandleTransform netId:" + message.netId + " is not for a valid player"); }
        }

        // --------------------- Compression Helper functions ------------------------

        static void WriteAngle(NetworkWriter writer, float angle, CompressionSyncMode compression)
        {
            switch (compression)
            {
                case CompressionSyncMode.None:
                {
                    writer.Write(angle);
                    break;
                }
                case CompressionSyncMode.Low:
                {
                    writer.Write((short)angle);
                    break;
                }
                case CompressionSyncMode.High:
                {
                    writer.Write((short)angle);
                    break;
                }
            }
        }

        static float ReadAngle(NetworkReader reader, CompressionSyncMode compression)
        {
            switch (compression)
            {
                case CompressionSyncMode.None:
                {
                    return reader.ReadSingle();
                }
                case CompressionSyncMode.Low:
                {
                    return reader.ReadInt16();
                }
                case CompressionSyncMode.High:
                {
                    return reader.ReadInt16();
                }
            }
            return 0;
        }

        // --------------------- Serialization Helper functions ------------------------

        static public void SerializeVelocity3D(NetworkWriter writer, Vector3 velocity, CompressionSyncMode compression)
        {
            writer.Write(velocity);
        }

        static public void SerializeVelocity2D(NetworkWriter writer, Vector2 velocity, CompressionSyncMode compression)
        {
            writer.Write(velocity);
        }

        static public void SerializeRotation3D(NetworkWriter writer, Quaternion rot, AxisSyncMode mode, CompressionSyncMode compression)
        {
            switch (mode)
            {
                case AxisSyncMode.None:
                    break;

                case AxisSyncMode.AxisX:
                    WriteAngle(writer, rot.eulerAngles.x, compression);
                    break;

                case AxisSyncMode.AxisY:
                    WriteAngle(writer, rot.eulerAngles.y, compression);
                    break;

                case AxisSyncMode.AxisZ:
                    WriteAngle(writer, rot.eulerAngles.z, compression);
                    break;

                case AxisSyncMode.AxisXY:
                    WriteAngle(writer, rot.eulerAngles.x, compression);
                    WriteAngle(writer, rot.eulerAngles.y, compression);
                    break;

                case AxisSyncMode.AxisXZ:
                    WriteAngle(writer, rot.eulerAngles.x, compression);
                    WriteAngle(writer, rot.eulerAngles.z, compression);
                    break;

                case AxisSyncMode.AxisYZ:
                    WriteAngle(writer, rot.eulerAngles.y, compression);
                    WriteAngle(writer, rot.eulerAngles.z, compression);
                    break;

                case AxisSyncMode.AxisXYZ:
                    WriteAngle(writer, rot.eulerAngles.x, compression);
                    WriteAngle(writer, rot.eulerAngles.y, compression);
                    WriteAngle(writer, rot.eulerAngles.z, compression);
                    break;
            }
        }

        static public void SerializeRotation2D(NetworkWriter writer, float rot, CompressionSyncMode compression)
        {
            WriteAngle(writer, rot, compression);
        }

        static public void SerializeSpin3D(NetworkWriter writer, Vector3 angularVelocity, AxisSyncMode mode, CompressionSyncMode compression)
        {
            switch (mode)
            {
                case AxisSyncMode.None:
                    break;

                case AxisSyncMode.AxisX:
                    WriteAngle(writer, angularVelocity.x, compression);
                    break;

                case AxisSyncMode.AxisY:
                    WriteAngle(writer, angularVelocity.y, compression);
                    break;

                case AxisSyncMode.AxisZ:
                    WriteAngle(writer, angularVelocity.z, compression);
                    break;

                case AxisSyncMode.AxisXY:
                    WriteAngle(writer, angularVelocity.x, compression);
                    WriteAngle(writer, angularVelocity.y, compression);
                    break;

                case AxisSyncMode.AxisXZ:
                    WriteAngle(writer, angularVelocity.x, compression);
                    WriteAngle(writer, angularVelocity.z, compression);
                    break;

                case AxisSyncMode.AxisYZ:
                    WriteAngle(writer, angularVelocity.y, compression);
                    WriteAngle(writer, angularVelocity.z, compression);
                    break;

                case AxisSyncMode.AxisXYZ:
                    WriteAngle(writer, angularVelocity.x, compression);
                    WriteAngle(writer, angularVelocity.y, compression);
                    WriteAngle(writer, angularVelocity.z, compression);
                    break;
            }
        }

        static public void SerializeSpin2D(NetworkWriter writer, float angularVelocity, CompressionSyncMode compression)
        {
            WriteAngle(writer, angularVelocity, compression);
        }

        static public Vector3 UnserializeVelocity3D(NetworkReader reader, CompressionSyncMode compression)
        {
            return reader.ReadVector3();
        }

        static public Vector3 UnserializeVelocity2D(NetworkReader reader, CompressionSyncMode compression)
        {
            return reader.ReadVector2();
        }

        static public Quaternion UnserializeRotation3D(NetworkReader reader, AxisSyncMode mode, CompressionSyncMode compression)
        {
            Quaternion rotation = Quaternion.identity;
            Vector3 rotv = Vector3.zero;

            switch (mode)
            {
                case AxisSyncMode.None:
                    break;

                case AxisSyncMode.AxisX:
                    rotv.Set(ReadAngle(reader, compression), 0, 0);
                    rotation.eulerAngles = rotv;
                    break;

                case AxisSyncMode.AxisY:
                    rotv.Set(0, ReadAngle(reader, compression), 0);
                    rotation.eulerAngles = rotv;
                    break;

                case AxisSyncMode.AxisZ:
                    rotv.Set(0, 0, ReadAngle(reader, compression));
                    rotation.eulerAngles = rotv;
                    break;

                case AxisSyncMode.AxisXY:
                    rotv.Set(ReadAngle(reader, compression), ReadAngle(reader, compression), 0);
                    rotation.eulerAngles = rotv;
                    break;

                case AxisSyncMode.AxisXZ:
                    rotv.Set(ReadAngle(reader, compression), 0, ReadAngle(reader, compression));
                    rotation.eulerAngles = rotv;
                    break;

                case AxisSyncMode.AxisYZ:
                    rotv.Set(0, ReadAngle(reader, compression), ReadAngle(reader, compression));
                    rotation.eulerAngles = rotv;
                    break;

                case AxisSyncMode.AxisXYZ:
                    rotv.Set(ReadAngle(reader, compression), ReadAngle(reader, compression), ReadAngle(reader, compression));
                    rotation.eulerAngles = rotv;
                    break;
            }
            return rotation;
        }

        static public float UnserializeRotation2D(NetworkReader reader, CompressionSyncMode compression)
        {
            return ReadAngle(reader, compression);
        }

        static public Vector3 UnserializeSpin3D(NetworkReader reader, AxisSyncMode mode, CompressionSyncMode compression)
        {
            Vector3 spin = Vector3.zero;
            switch (mode)
            {
                case AxisSyncMode.None:
                    break;

                case AxisSyncMode.AxisX:
                    spin.Set(ReadAngle(reader, compression), 0, 0);
                    break;

                case AxisSyncMode.AxisY:
                    spin.Set(0, ReadAngle(reader, compression), 0);
                    break;

                case AxisSyncMode.AxisZ:
                    spin.Set(0, 0, ReadAngle(reader, compression));
                    break;

                case AxisSyncMode.AxisXY:
                    spin.Set(ReadAngle(reader, compression), ReadAngle(reader, compression), 0);
                    break;

                case AxisSyncMode.AxisXZ:
                    spin.Set(ReadAngle(reader, compression), 0, ReadAngle(reader, compression));
                    break;

                case AxisSyncMode.AxisYZ:
                    spin.Set(0, ReadAngle(reader, compression), ReadAngle(reader, compression));
                    break;

                case AxisSyncMode.AxisXYZ:
                    spin.Set(ReadAngle(reader, compression), ReadAngle(reader, compression), ReadAngle(reader, compression));
                    break;
            }
            return spin;
        }

        static public float UnserializeSpin2D(NetworkReader reader, CompressionSyncMode compression)
        {
            return ReadAngle(reader, compression);
        }

        public override int GetNetworkChannel()
        {
            return Channels.DefaultUnreliable;
        }

        public override float GetNetworkSendInterval()
        {
            return m_SendInterval;
        }

        public override void OnStartAuthority()
        {
            // must reset this timer, or the server will continue to send target position instead of current position
            m_LastClientSyncTime = 0;
        }
    }
}
#endif //ENABLE_UNET