Unity Time.fixeddeltatime
The interval in seconds at which physics and other fixed frame rate updates (like MonoBehaviour's FixedUpdate) are performed.
Unity does not adjust fixedDeltaTime based on Time.timeScale. The fixedDeltaTime interval is always relative to the in-game time which Time.timeScale affects.
See Time and Frame Rate Management in the User Manual for more information about how this property relates to the other Time properties.
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