How would you run an entity with a delay compared with another entity? | Bevy | Page 1

steep raft Jan 30, 2023, 11:23 PM

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For example i'd like to run a system '100ms' behind the rest of my app.
The system would run on a fixed-timestep, but delayed by a certain amount compared with another fixed-timestep systems.

(This would be to perform entity interpolation between 2 updates received from the server)

dusty venture Jan 30, 2023, 11:35 PM

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I would write a system that gathers the data needed for the delayed system and stores it in a buffer. Then your "delayed" system can pull the data out of the buffer from the frame 100ms ago instead of reading up-to-date data from the world

steep raft Jan 30, 2023, 11:38 PM

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awesome, thanks

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And is it okay if I used the function Instant::now()?

dusty venture Jan 31, 2023, 12:04 AM

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Since you're using FixedTimestep, it should be a constant number of frames that you could calculate ahead of time.

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But in general you shouldn't use your system time, you should use Res<Time>, since it will give you exactly the same time if you are within the same frame

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I'm not sure if Res<Time> works with fixed timestep though. I know some people were discussing that lately

bleak veldt Jan 31, 2023, 12:23 AM

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I've used Res<Time> in a fixed time step, can confirm it works!

#How would you run an entity with a delay compared with another entity?