[Advanced] AddForce Jitter

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I've struggled with this question for years now and there is no good answer anywhere on the internet as far as I can tell.

I am simply trying to take in input from the player during Update() and then do this

Rigidbody2d.AddForce(new Vector2 (inputx, inputy) * Time.deltaTime)

During FixedUpdate(). Somehow, even when I release the input, at a certain point it starts jittering. My physics timestep is 0.2. Please, once and for all, how do I move the player character with AddForce with no stutter?

Answer 1

Best Answer

Answer by Jehutyver10 · Sep 06, 2019 at 06:31 PM

I solved it: The answer, once and for all, is to put the camera's tracking method in FixedUpdate since the force is being added in FixedUpdate; this will make the two actions synchronize.

At long last, I have an answer. Future frustrated devs, gaze upon my struggle and learn!

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Answer 2

Answer by Pangamini · Sep 06, 2019 at 08:32 AM

Time.deltaTime is a time difference between Update() calls. If you are applying the force in FixedUpdate(), you should use Time.fixedDeltaTime.

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Bunny83 · Sep 06, 2019 at 12:08 PM 0

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This won't change anything and isn't recommended since Time.deltaTime will already return the right delta time value depending on where it's used. See fixedDeltaTime:

For reading the delta time it is recommended to use Time.deltaTime ins$$anonymous$$d because it automatically returns the right delta time if you are inside a FixedUpdate function or Update function.

Pangamini Bunny83 · Sep 06, 2019 at 12:29 PM 0

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Wow, is that new? Or was it always like that?

Bunny83 Pangamini · Sep 06, 2019 at 12:56 PM 0

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It always was like that ^^.

Jehutyver10 · Sep 06, 2019 at 05:58 PM 0

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Thank you for your answer but this follows the exact pattern I found trying to answer this question:

Someone asks how to remove jitter
Someone posts a solution.
Someone else says why that solution won't work.
The question remains unanswered.

I hate to be a bother but do you have any other possible solutions? Thank you again.

pironc Jehutyver10 · Feb 06, 2021 at 11:18 AM 0

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You can try to set the Rigidbody2D's "Collision Detection" mode from "Discrete" to "Continuous".

[Advanced] AddForce Jitter

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