void UpdateClient()
{
// client authority, and local player (= allowed to move myself)?
if (IsClientWithAuthority)
{
// send to server each 'sendInterval'
// NetworkTime.localTime for double precision until Unity has it too
//
// IMPORTANT:
// snapshot interpolation requires constant sending.
// DO NOT only send if position changed. for example:
// ---
// * client sends first position at t=0
// * ... 10s later ...
// * client moves again, sends second position at t=10
// ---
// * server gets first position at t=0
// * server gets second position at t=10
// * server moves from first to second within a time of 10s
// => would be a super slow move, instead of a wait & move.
//
// IMPORTANT:
// DO NOT send nulls if not changed 'since last send' either. we
// send unreliable and don't know which 'last send' the other end
// received successfully.
if (NetworkTime.localTime >= lastClientSendTime + sendInterval)
{
// send snapshot without timestamp.
// receiver gets it from batch timestamp to save bandwidth.
NTSnapshot snapshot = ConstructSnapshot();
CmdClientToServerSync(
// only sync what the user wants to sync
syncPosition ? snapshot.position : new Vector3?(),
syncRotation? snapshot.rotation : new Quaternion?(),
syncScale ? snapshot.scale : new Vector3?()
);
lastClientSendTime = NetworkTime.localTime;
}
}
// for all other clients (and for local player if !authority),
// we need to apply snapshots from the buffer
else
{
// compute snapshot interpolation & apply if any was spit out
// TODO we don't have Time.deltaTime double yet. float is fine.
if (SnapshotInterpolation.Compute(
NetworkTime.localTime, Time.deltaTime,
ref clientInterpolationTime,
bufferTime, clientBuffer,
catchupThreshold, catchupMultiplier,
Interpolate,
out NTSnapshot computed))
{
NTSnapshot start = clientBuffer.Values[0];
NTSnapshot goal = clientBuffer.Values[1];
ApplySnapshot(start, goal, computed);
}
}
}
// local authority client sends sync message to server for broadcasting
protected virtual void OnClientToServerSync(Vector3?position, Quaternion?rotation, Vector3?scale)
{
// only apply if in client authority mode
if (!clientAuthority)
{
return;
}
// protect against ever growing buffer size attacks
if (serverBuffer.Count >= bufferSizeLimit)
{
return;
}
// only player owned objects (with a connection) can send to
// server. we can get the timestamp from the connection.
double timestamp = connectionToClient.remoteTimeStamp;
// position, rotation, scale can have no value if same as last time.
// saves bandwidth.
// but we still need to feed it to snapshot interpolation. we can't
// just have gaps in there if nothing has changed. for example, if
// client sends snapshot at t=0
// client sends nothing for 10s because not moved
// client sends snapshot at t=10
// then the server would assume that it's one super slow move and
// replay it for 10 seconds.
if (!position.HasValue)
{
position = targetComponent.localPosition;
}
if (!rotation.HasValue)
{
rotation = targetComponent.localRotation;
}
if (!scale.HasValue)
{
scale = targetComponent.localScale;
}
// construct snapshot with batch timestamp to save bandwidth
NTSnapshot snapshot = new NTSnapshot(
timestamp,
NetworkTime.localTime,
position.Value, rotation.Value, scale.Value
);
// add to buffer (or drop if older than first element)
SnapshotInterpolation.InsertIfNewEnough(snapshot, serverBuffer);
}
// update //////////////////////////////////////////////////////////////
void UpdateServer()
{
// broadcast to all clients each 'sendInterval'
// (client with authority will drop the rpc)
// NetworkTime.localTime for double precision until Unity has it too
//
// IMPORTANT:
// snapshot interpolation requires constant sending.
// DO NOT only send if position changed. for example:
// ---
// * client sends first position at t=0
// * ... 10s later ...
// * client moves again, sends second position at t=10
// ---
// * server gets first position at t=0
// * server gets second position at t=10
// * server moves from first to second within a time of 10s
// => would be a super slow move, instead of a wait & move.
//
// IMPORTANT:
// DO NOT send nulls if not changed 'since last send' either. we
// send unreliable and don't know which 'last send' the other end
// received successfully.
//
// Checks to ensure server only sends snapshots if object is
// on server authority(!clientAuthority) mode because on client
// authority mode snapshots are broadcasted right after the authoritative
// client updates server in the command function(see above), OR,
// since host does not send anything to update the server, any client
// authoritative movement done by the host will have to be broadcasted
// here by checking IsClientWithAuthority.
if (NetworkTime.localTime >= lastServerSendTime + sendInterval &&
(!clientAuthority || IsClientWithAuthority))
{
// send snapshot without timestamp.
// receiver gets it from batch timestamp to save bandwidth.
NTSnapshot snapshot = ConstructSnapshot();
RpcServerToClientSync(
// only sync what the user wants to sync
syncPosition ? snapshot.position : new Vector3?(),
syncRotation? snapshot.rotation : new Quaternion?(),
syncScale ? snapshot.scale : new Vector3?()
);
lastServerSendTime = NetworkTime.localTime;
}
// apply buffered snapshots IF client authority
// -> in server authority, server moves the object
// so no need to apply any snapshots there.
// -> don't apply for host mode player objects either, even if in
// client authority mode. if it doesn't go over the network,
// then we don't need to do anything.
if (clientAuthority && !hasAuthority)
{
// compute snapshot interpolation & apply if any was spit out
// TODO we don't have Time.deltaTime double yet. float is fine.
if (SnapshotInterpolation.Compute(
NetworkTime.localTime, Time.deltaTime,
ref serverInterpolationTime,
bufferTime, serverBuffer,
catchupThreshold, catchupMultiplier,
Interpolate,
out NTSnapshot computed))
{
NTSnapshot start = serverBuffer.Values[0];
NTSnapshot goal = serverBuffer.Values[1];
ApplySnapshot(start, goal, computed);
}
}
}
// server broadcasts sync message to all clients
protected virtual void OnServerToClientSync(Vector3?position, Quaternion?rotation, Vector3?scale)
{
// in host mode, the server sends rpcs to all clients.
// the host client itself will receive them too.
// -> host server is always the source of truth
// -> we can ignore any rpc on the host client
// => otherwise host objects would have ever growing clientBuffers
// (rpc goes to clients. if isServer is true too then we are host)
if (isServer)
{
return;
}
// don't apply for local player with authority
if (IsClientWithAuthority)
{
return;
}
// protect against ever growing buffer size attacks
if (clientBuffer.Count >= bufferSizeLimit)
{
return;
}
// on the client, we receive rpcs for all entities.
// not all of them have a connectionToServer.
// but all of them go through NetworkClient.connection.
// we can get the timestamp from there.
double timestamp = NetworkClient.connection.remoteTimeStamp;
// position, rotation, scale can have no value if same as last time.
// saves bandwidth.
// but we still need to feed it to snapshot interpolation. we can't
// just have gaps in there if nothing has changed. for example, if
// client sends snapshot at t=0
// client sends nothing for 10s because not moved
// client sends snapshot at t=10
// then the server would assume that it's one super slow move and
// replay it for 10 seconds.
if (!position.HasValue)
{
position = targetComponent.localPosition;
}
if (!rotation.HasValue)
{
rotation = targetComponent.localRotation;
}
if (!scale.HasValue)
{
scale = targetComponent.localScale;
}
// construct snapshot with batch timestamp to save bandwidth
NTSnapshot snapshot = new NTSnapshot(
timestamp,
NetworkTime.localTime,
position.Value, rotation.Value, scale.Value
);
// add to buffer (or drop if older than first element)
SnapshotInterpolation.InsertIfNewEnough(snapshot, clientBuffer);
}
void UpdateClient()
{
// client authority, and local player (= allowed to move myself)?
if (IsClientWithAuthority)
{
// https://github.com/vis2k/Mirror/pull/2992/
if (!NetworkClient.ready)
{
return;
}
// send to server each 'sendInterval'
// NetworkTime.localTime for double precision until Unity has it too
//
// IMPORTANT:
// snapshot interpolation requires constant sending.
// DO NOT only send if position changed. for example:
// ---
// * client sends first position at t=0
// * ... 10s later ...
// * client moves again, sends second position at t=10
// ---
// * server gets first position at t=0
// * server gets second position at t=10
// * server moves from first to second within a time of 10s
// => would be a super slow move, instead of a wait & move.
//
// IMPORTANT:
// DO NOT send nulls if not changed 'since last send' either. we
// send unreliable and don't know which 'last send' the other end
// received successfully.
if (NetworkTime.localTime >= lastClientSendTime + sendInterval)
{
// send snapshot without timestamp.
// receiver gets it from batch timestamp to save bandwidth.
NTSnapshot snapshot = ConstructSnapshot();
#if onlySyncOnChange_BANDWIDTH_SAVING
cachedSnapshotComparison = CompareSnapshots(snapshot);
if (cachedSnapshotComparison && hasSentUnchangedPosition && onlySyncOnChange)
{
return;
}
#endif
#if onlySyncOnChange_BANDWIDTH_SAVING
CmdClientToServerSync(
// only sync what the user wants to sync
syncPosition && positionChanged ? snapshot.position : default(Vector3?),
syncRotation && rotationChanged ? snapshot.rotation : default(Quaternion?),
syncScale && scaleChanged ? snapshot.scale : default(Vector3?)
);
#else
CmdClientToServerSync(
// only sync what the user wants to sync
syncPosition ? snapshot.position : default(Vector3?),
syncRotation ? snapshot.rotation : default(Quaternion?),
syncScale ? snapshot.scale : default(Vector3?)
);
#endif
lastClientSendTime = NetworkTime.localTime;
#if onlySyncOnChange_BANDWIDTH_SAVING
if (cachedSnapshotComparison)
{
hasSentUnchangedPosition = true;
}
else
{
hasSentUnchangedPosition = false;
lastSnapshot = snapshot;
}
#endif
}
}
// for all other clients (and for local player if !authority),
// we need to apply snapshots from the buffer
else
{
// compute snapshot interpolation & apply if any was spit out
// TODO we don't have Time.deltaTime double yet. float is fine.
if (SnapshotInterpolation.Compute(
NetworkTime.localTime, Time.deltaTime,
ref clientInterpolationTime,
bufferTime, clientBuffer,
catchupThreshold, catchupMultiplier,
Interpolate,
out NTSnapshot computed))
{
NTSnapshot start = clientBuffer.Values[0];
NTSnapshot goal = clientBuffer.Values[1];
ApplySnapshot(start, goal, computed);
}
}
}
