Question What does a beginner need to know about FixedUpdate()?

I'm thinking of pausing a game I'm making, but don't want to actually apply the pause until the VERY beginning of the next frame (assuming Awake, OnEnable, Reset, and Start have all done their thing). Would FixedUpdate() be appropriate?


Also, in the manual on "order of execution for event functions" it says that FixedUpdate() is for User Callback. I assume that means it's a function for me to use, and not something the computer itself uses automatically. Is that correct?

 

Here is some timing diagram help:

https://docs.unity3d.com/Manual/ExecutionOrder.html

Here is an abbreviated and better-annotated version of the above:

https://forum.unity.com/threads/a-c...ution-order-of-unity-event-functions.1381647/

Two good discussions on Update() vs FixedUpdate() timing:

https://jacksondunstan.com/articles/4824

https://johnaustin.io/articles/2019/fix-your-unity-timestep

 

FixedUpdate is just to use for physics.

 

I can't see many ways that you would need to worry about setting the flag in the middle of a frame, but if it's a real concern, you can start a coroutine which uses WaitForEndOfFrame to achieve the necessary "between frames" flip of your state. It basically lets you run your own code at the moment that the frame has fully been rendered but before the user sees it, to allow for screen grabbing or other things that can't affect the current update loop because it's already done.

The Execution Order chart Kurt gave you shows that moment in the flow.

 

Thanks for the info. WaitForEndOfFrame sounds like another good option!