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Time.fixedUnscaledDeltaTime

public static float fixedUnscaledDeltaTime;

Description

The interval in seconds of timeScale-independent ("real") time at which physics and other fixed frame rate updates (like MonoBehaviour's FixedUpdate) are performed.(Read Only).

Unlike Time.fixedDeltaTime this value is in real time rather than scaled game-time and therefore not affected by Time.timeScale.