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Hello, guys.

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In this video, I want to talk about execution order.

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Something you should know.

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I actually made this very same video just months ago on the very same topic for my another course.

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So if you don't mind, let's watch that video together because it has same information.

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And I don't really see the point of recording same video again.

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Know, I hope you can forgive me that.

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Let's watch the video here.

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Hello, my name is Alex, and in this video I want to talk about execution order in unity.

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Why we need to know about it.

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I'm going to tell you in a second.

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For now, just watch and absorb information.

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All right.

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I'm going to open my player script.

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And you can see here there is an update and a start method.

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These two functions called, by the way, function and method is the same.

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All right.

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So sometimes I'm going to use that word, sometimes another, but it doesn't matter.

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It's the same.

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Now start called once before the update.

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Once before the first update an update called once per frame.

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So if your game is 60 frames per second, then update will be called 60 times per second.

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I have already debug line in the start method and I'm going to make one more in the update.

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Update is called.

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Can I save it?

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Now, check this.

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When I play my game.

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The start was called only once.

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An update is called all the time.

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That's why we do movement and check for inputs in the update because we need to check if there is input

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all the time.

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Right?

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Every frame.

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We need to make sure if somebody pressed or did not press the button, but start is called once and

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it can be used for different stuff like assigning default value, assigning components.

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And we're going to do all of that later.

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But now I want to tell you about a few more methods that are in the execution order.

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There is a wake function, a wake function called once when game is initialized or when game object

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is enabled.

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I'm going to do debug log.

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Awake was cold.

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And back in unity, I'm going to duplicate my player and switch it off.

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Because it has players script here and here.

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Now, look.

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I played a game a week, was called once.

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Start was called once and update is called all the time.

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Now if I switch off, this one function is not called anymore and I'm going to switch off another one

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that I duplicated.

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Check this out.

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Awake was cold.

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Start was cold.

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Now if I switch it off and switch on the first one.

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There will be no wake or start method because, as I said, it called only once at the beginning.

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There is one more and it is called fixed update.

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It happens before the update.

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Fixed update.

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Debug log.

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Fixed.

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Update.

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Ace hold.

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Is it?

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The right sentence is called.

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Uh, who cares?

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All right.

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Now you can see that fixed update is called all the time as well, but not so often as an update.

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Why is that?

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Because fixed update has certain amount of steps.

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I would say we can go to edit project settings, open the time, and here you can see fixed timestamp

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0.02.

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So at the moment, fixed update called 50 times per second.

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If I would do zero 0 to 0 two.

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Yes.

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Clear.

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Now you can see it's called five times per second.

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Why?

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It's.

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Yeah.

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Okay now?

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Yeah.

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0.2.

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And now it's called five times per second.

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Slower.

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Much slower.

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If I said 0.5 would be called two times per second and so on.

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Why we need this?

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There is a reason why we need this look fixed.

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Update Mostly used for coding and check in physics and movement because you don't want your movement

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to be faster than you need it to be.

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Like there was a case in Fallout 76, for example, when if piece of the player was low, he moved slowly.

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But when space is higher, he moved faster and he attacked faster.

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I don't think it's important for this game, but anyway, you should know this information, right?

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Actually, execution in order is much bigger and more complex than I showed you is much more than awake.

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Start fixed update and update.

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You can find it easily in Google and just type unity execution order right here.

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And the first link you can see how big it is.

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Wake on enable reset start fixed update.

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We talked about then some more than update, then some more then later update and some more and application

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quit disable destroyed.

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Right.

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And at some point you'll know it and you'll need to know it.

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But for now, as a beginner, you don't have to use your phone right?

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Or computer you don't know how does it work, but you can use it.

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It's the same here.

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You're not sure how does it work, but you can use it and it's totally fine because we here talking

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about making a game, not a sandwich.

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It's a really big case.

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You know, not everybody can make a game.

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Not everybody can do it fast.

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Most of the people won't even finish making a game.

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And in fact, most of the people even want finish a course where I'm showing how to make a game.

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Right.

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So you cannot beat it overnight.

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It's fine.

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Take your time.

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And one day I promise to you you'll be there.

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Yeah.

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So I agree with everything I said before months ago, and I feel like my voice is a bit sleepy on that

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video.

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Maybe I did record it in the morning.

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Anyway, now you know a bit more.

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And let's move to next video.