// 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);
}
// 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);
}