The multiplayer Game Jam

@OpherV
Fullstack2gether 2017

Can we make this experience

easier? faster?

 realtime multiplayer game running in the browser

@opherv

Hi! I'm Opher

I'm a creative developer at Eko

 

http://lance.gg

Lance is:

@opherv

Multiplayer server + client library

Written entirely in JavaScript

Open source and free to use

Makes multiplayer games on the web easy(ish) and fun!

anatomy of a game

 

@opherv

while (true)
{
  processInput();
  updateGameState();
  render();
}

Input

0

1

2

3

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render

game step

8

9

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15

@opherv

peer-to-peer

Why do you even need a server?

Because your players suck

@opherv

if cheating can happen,

it will happen

authoritative server

@opherv

authoritative server

Run game world

Receive input request

Validate input

Broadcast game state

13,759 km

299,792,458 m / s

Speed of Light

45 milliseconds

Tel Aviv -> Melbourne

Round Trip Time (RTT) > 90ms

@opherv

Tel Aviv

Melbourne

Request - 45ms

Reply - 45ms

LAG

Syncing the game world

Game Loop

Render Loop

@opherv

Broadcast Loop

Input

0

1

2

3

4

5

6

7

Broadcast

game step

8

9

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15

Server view

Option 1

client step N

X: 200

client step M

X: 50

Interpolation

30

31

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39

26

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35

The client is in the past

Real Time Strategy *

Role Playing Games

"client side prediction"

Player presses "up"

Running the same game code,

both on the server and the client

@opherv

The client is in the past

but also... kinda in the future

"bending"

Physics based games

First person shooters

But what about...

Option 2: Extrapolation

30

31

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30

31

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Input

game state

extrapolated

steps

Interpolation

Faster, less precise

Smoother movement at the cost of delay

 

Extrapolation

Requires heavier simulation

Essential for physics-based games

@opherv

All must implement:

Client side prediction

Bending

@opherv

@opherv

@opherv

@opherv

more info: http://lance.gg

@opherv

Free Stickers!

follow me @OpherV

Lets start!

@OpherV

opherv.com

Multiplayer Game Jam

By Opher Vishnia

Multiplayer Game Jam

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