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Unity 3d Basics( Update and fixedUpdate difference) [04] Video Lecture | Build a Game: Unity Tutorial (Hindi) - Game Development

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FAQs on Unity 3d Basics( Update and fixedUpdate difference) [04] Video Lecture - Build a Game: Unity Tutorial (Hindi) - Game Development

1. What is the difference between Update and FixedUpdate in Unity 3D?
Ans. In Unity 3D, the Update function is called once per frame and is used for regular updates and calculations that depend on the frame rate. On the other hand, the FixedUpdate function is also called once per frame but at fixed intervals, making it ideal for physics calculations that need to be consistent across different frame rates.
2. How often is the FixedUpdate function called in Unity 3D?
Ans. The FixedUpdate function is called at a fixed time interval, which is typically every 0.02 seconds (50 times per second) by default in Unity. However, this interval can be changed in the Time settings of the Unity editor.
3. Can I use Update instead of FixedUpdate for physics calculations in Unity 3D?
Ans. It is generally recommended to use FixedUpdate for physics calculations in Unity 3D. This is because FixedUpdate ensures that the physics calculations are consistent across different frame rates and avoids potential issues with variable frame rates. However, in certain scenarios where the physics calculations are not critical or time-dependent, using Update may still be acceptable.
4. Are there any performance differences between Update and FixedUpdate in Unity 3D?
Ans. Yes, there can be performance differences between Update and FixedUpdate in Unity 3D. Since Update is called once per frame, it has the potential to be called more frequently than FixedUpdate, which can lead to higher CPU usage. On the other hand, FixedUpdate is called at fixed intervals, making it more predictable and consistent in terms of performance.
5. Can I use both Update and FixedUpdate in the same script in Unity 3D?
Ans. Yes, it is common to use both Update and FixedUpdate in the same script in Unity 3D. Update is often used for general game logic and non-physics calculations, while FixedUpdate is used specifically for physics calculations. However, it is important to keep in mind the differences between the two functions and use them appropriately based on the requirements of your game.
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