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14 Cards in this Set
- Front
- Back
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What does the term "snapshot" refer to?
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A snapshot is a complete game state that reflects the most current aspects of the game. This includes player/object positions, actions, changes to game world, etc.
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What is a tick, and what occurs during one?
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A tick is a fixed amount of time ("delta time"). In one tick, a server will:
- Parse player commands - Check commands against game rules - Run world simulation (AI, physics, etc.) - Update any objects representing the game state |
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What are some advantages of a high tick/snapshot rate?
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Higher tick rates increase the precision of the simulation.
Higher snapshot rates increase the smoothness of clients perception. |
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What are some disadvantages of a high tick/snapshot rate?
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More CPU load and more Bandwidth.
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What is latency, and how is minimum latency calculated?
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Latency is the time it takes a packet to travel from the source to the destination.
min_latency = distance / speed of light |
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What is jitter?
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Jitter is the variation in latency from one packet to the next.
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What is sequencing?
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Sequencing can be use to determine ordering of messages.
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How does sequencing work?
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Adding a sequencing number to the header of a message will help the client sort out which message came first. After a message is sent, the number is incremented.
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What is delta compression
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Delta compression is a technique that can be applied to network data to reduce it in size.
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How does delta compression work?
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With delta compression, we only send changes in the game state, not the full game state. This helps us reduce the size by only sending information we need to send.
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What is Client Side Prediction?
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Client Side Prediction is when the client predicts the result of user input before the server has issued an update.
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What benefit does Client Side Prediction give us?
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The appearance of latency is reduced.
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How is Client Side Prediction implemented, ie how does it work?
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What is Broadcasting?
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Broadcast is a way to send a message to all hosts in your network. It can only be used with UDP.
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