Interpolation on Client Between Server States I have an authoritative server which is sending position data to client every 100 ms. Ping between client and server is about 70 ms.(which is actually a variable) I have few questions regarding to interpolation between 2 server states recieved by client. 1-) Where should i place my interpolation code ? Inside my clients update method or should i interpolate whenever i recieve 2 update from server ? Example: fun onWorldData(data:JSONObject){ // called when update arrives from server. //initially serverUpdate1 and serverUpdate2 are empty objects. serverUpdate1 = serverUpdate2 serverUpdate2 = data if(serverUpdate1.has("x")){ // when at least 2 updates arrived interpolate and set position(just for 1st call) var blackPieceBodyX = Interpolation.linear.apply(serverUpdate1.get("x").toString().toFloat(),serverUpdate2.get("x").toString().toFloat(),0.15f) // how to calculate 3rd parameter ? var blackPieceBodyY = Interpolation.linear.apply(serverUpdate1.get("y").toString().toFloat(),serverUpdate2.get("y").toString().toFloat(),0.15f) blackPiece.body.setTransform(Vector2(blackPieceBodyX,blackPieceBodyY),0f) // this code sets position of body } } As you see interpolation code is called when i recieve update from server, not all the time inside update. 2-)How do i calculate 3rd parameter of Interpolation function ? In above code i was just experimenting with arbitrary numbers.Since server sends it every 100ms and ping is around 70,what should be 3rd parameter of interpolate function and how to calculate it ? Since for sure ping will be part of that calculation formula should i ping server to check ping to use in that formula all the time ? Or timestamp each serverupdate sent by server and when recieved get clients time and substract them ? 3-)Another approach i tried is this: fun onWorldData(data:JSONObject){ // called when sv update arrives to client. serverUpdate = data timeSinceLastUpdate = 0f } fun update(){ if(serverUpdate.has("x")){ // if server update arrived var blackPieceBodyX = Interpolation.linear.apply(blackPiece.body.position.x,serverUpdate.get("x").toString().toFloat(),timeSinceLastUpdate/updateTime) var blackPieceBodyY = Interpolation.linear.apply(blackPiece.body.position.y,serverUpdate.get("y").toString().toFloat(),timeSinceLastUpdate/updateTime) blackPiece.body.setTransform(Vector2(blackPieceBodyX,blackPieceBodyY),0f) //set position of body to interpolated values. timeSinceLastUpdate += deltaTime } } As you see in this example i interpolate between interpolated position of body and serverUpdate, not exactly interpolating between 2 server states inside my update method.updateTime is ping+serverUpdateRate since ping is around 70 and server sends updates every 100 ms it should be like 170(?) or formula is completely wrong i am not sure. Right now i am not sending timeStamp with serverUpdate from server but if it is necessary for interpolation 3rd parameter calculation i can do that. Thanks https://ift.tt/eA8V8J

I have an authoritative server which is sending position data to client every 100 ms. Ping between client and server is about 70 ms.(which is actually a variable) I have few questions regarding to interpolation between 2 server states recieved by client. 1-) Where should i place my interpolation code ? Inside my clients update method or should i interpolate whenever i recieve 2 update from server ? Example: fun onWorldData(data:JSONObject){ // called when update arrives from server. //initially serverUpdate1 and serverUpdate2 are empty objects. serverUpdate1 = serverUpdate2 serverUpdate2 = data if(serverUpdate1.has("x")){ // when at least 2 updates arrived interpolate and set position(just for 1st call) var blackPieceBodyX = Interpolation.linear.apply(serverUpdate1.get("x").toString().toFloat(),serverUpdate2.get("x").toString().toFloat(),0.15f) // how to calculate 3rd parameter ? var blackPieceBodyY = Interpolation.linear.apply(serverUpdate1.get("y").toString().toFloat(),serverUpdate2.get("y").toString().toFloat(),0.15f) blackPiece.body.setTransform(Vector2(blackPieceBodyX,blackPieceBodyY),0f) // this code sets position of body } } As you see interpolation code is called when i recieve update from server, not all the time inside update. 2-)How do i calculate 3rd parameter of Interpolation function ? In above code i was just experimenting with arbitrary numbers.Since server sends it every 100ms and ping is around 70,what should be 3rd parameter of interpolate function and how to calculate it ? Since for sure ping will be part of that calculation formula should i ping server to check ping to use in that formula all the time ? Or timestamp each serverupdate sent by server and when recieved get clients time and substract them ? 3-)Another approach i tried is this: fun onWorldData(data:JSONObject){ // called when sv update arrives to client. serverUpdate = data timeSinceLastUpdate = 0f } fun update(){ if(serverUpdate.has("x")){ // if server update arrived var blackPieceBodyX = Interpolation.linear.apply(blackPiece.body.position.x,serverUpdate.get("x").toString().toFloat(),timeSinceLastUpdate/updateTime) var blackPieceBodyY = Interpolation.linear.apply(blackPiece.body.position.y,serverUpdate.get("y").toString().toFloat(),timeSinceLastUpdate/updateTime) blackPiece.body.setTransform(Vector2(blackPieceBodyX,blackPieceBodyY),0f) //set position of body to interpolated values. timeSinceLastUpdate += deltaTime } } As you see in this example i interpolate between interpolated position of body and serverUpdate, not exactly interpolating between 2 server states inside my update method.updateTime is ping+serverUpdateRate since ping is around 70 and server sends updates every 100 ms it should be like 170(?) or formula is completely wrong i am not sure. Right now i am not sending timeStamp with serverUpdate from server but if it is necessary for interpolation 3rd parameter calculation i can do that. Thanks

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