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In this lecture, we're going to hook up in the code so that when Barry crashes or crosses the finish

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line, we trigger a boom.

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Our particle effects.

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The first thing to do is open up.

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Hmm.

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Let's see.

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We'll work on finish line together, and then I'll set you the challenge of working on the crash detector

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yourself.

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So we have finish line open.

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What we need to do, first of all, is create a reference for the particle system.

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So what do I mean by that?

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Well, when we tell unity to, hey, you bumped your head, play this particular thing, it's going

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to say to us, okay, Rick, what particular thing do you want me to play?

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So in this case, what I'm going to set up the reference is by jumping into my finish line script and

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saying or typing serialised field and I'm going to create a reference to a particle system and that

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particle system I am going to call finish effect semicolon.

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And so if we save this, when we jump back into unity, we find where our finishing line script is.

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It's on our finish line game object.

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Now you can see we have this finish effect option.

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So I'm going to grab the finish effect particle effect, drag that into my finish effect.

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Now back over into our script.

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Now that it's knows this finish effect, that's the variable that's storing our particle system, we

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can trigger it at the right point.

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The way we do that is on trigger enter.

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Yep.

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When we bump into something or when something bumps into us.

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Sorry if it's the player we want to invoke our load seen with our bit of a delay.

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And that's simply a case of accessing our particle effect.

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So finish effect which we know is a particle system dot and then we've got a few options in here.

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If you scroll through, you'll see one that is pretty aptly name, which is just play and then parentheses

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because it's a method and semicolon.

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It's as simple as that saying, Hey, play this particle effect, let's save that up and see if we have

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any unexpected consequences of doing this.

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I can think of one we might have now when I click on play.

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Does anything happen at the start?

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Yeah.

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Boom.

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We had a finish line effect before we even got there.

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That's cool.

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I'm glad that happened.

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When we click on Finish Effect, you can see there's a setting down here which is play on Awake.

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We want to uncheck that.

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If we have play on Awake, then literally when we click the play button, it will say, Oh, I'm ready

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to go and it'll play the particle system.

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We don't want to do that.

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So now when I click on play, let's see if this is going to work for us.

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That didn't zoom, zoom, zoom.

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And then as we cross the finish line, kaboom.

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Okay, it's playing it in the scene view, but it's not playing it in the game view.

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Why is that?

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Well, my guess is if we click on the finish effect, scroll all the way down, find our order in layer,

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set that to 100 just to make sure that's not going to be a thing at all.

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Okay, so let's scroll.

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You see the play on effect for that other particle effect.

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Kaboom in the world is playing in our scene view, but not our world view.

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It's a bit weird.

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Has got me a little bit confused.

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Let's see if we can figure this out.

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Okay, so I've had a little bit of a poke around.

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I think I know what the issue here is.

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We click on the 2D button or click to change from 2D to 3D.

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You can see that our particle effect is I don't even know where that is.

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You know, it's behind the camera so we can see it when we're in scene view, but we can't see it when

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we're in game view.

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So the reason that's happening is our finish line has let's see the finish line, Z position or Z position

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is at -35 and our particle effect is at zero.

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So the particle effect is right on top.

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There's some weirdness going on there.

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So let's just sort that out.

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Let's go to the finishing line.

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Let's make this zero for the Z value.

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And then you can see that the post is way off in the background.

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I think those ones are.

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So my apologies.

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I didn't zero those out when we created those.

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So you click on post, make the z value zero, click on top, make that zero as well.

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Let's click on the finish effect.

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It's at zero, the finish line.

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So it's all at zero.

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Nothing is being way off in the distance or the other side of the camera.

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Now when we click on play, we should see that.

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But we cruise along kind of.

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We'd looking at it over that other side.

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Yes, it's in front.

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Boom, and then we reload.

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Excellent.

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So there we go.

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We've got that figured out.

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Job well done.

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Click back on 2D to go back into 2D mode.

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I'm going to save that up and I'm going to issue you a challenge.

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The challenge is to trigger our crash particles so when the player crashes, trigger the crash particles

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to play and make sure you pay attention to things like the order to sort all that out, as well as making

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sure that there's no weirdness like play on Awake, for example.

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So that's a challenge.

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Take that on.

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So you back here when you're done.

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Okey dokey.

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So the first thing I'm going to do because I noticed it before was click on Barre, click on the crash

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effect.

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And as soon as I click on it, we get this play on a wake.

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So I'm going to turn off play on a wake bump.

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So not playing when we are awaking.

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Now I'm going to jump into my crash detector script and once again I'm going to serialize a variable

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serialize field.

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And this will be once again particle system and we will call this crash effect semicolon.

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Now, where are we going to play this?

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Well, we're going to play it when we bump into something.

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You could do this before your invoke or after your invoke.

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It doesn't matter so much.

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But you do want to ask yourself, is there going to be a difference if I do a thing before an other

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thing?

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In this case, playing the particle system, I think is a good thing to come first.

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Before we say, now, I'd like you to load the scene, but it shouldn't make a big impact, but we'll

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pop it first nonetheless.

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So we're going to say crash effect, dot, play, parentheses, semicolon and save jump back to unity.

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Let's just have a look at our order.

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So Barry's on zero border, top and bottom run zero, crash effect zero.

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So that should all be fine.

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Good stuff.

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Let's do a dump.

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Dump, and then we'll just spin backwards and crash.

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Nothing happened.

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Okay, the crash variable.

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Okay, this is cool.

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So we've seen an exception and we haven't talked about this a lot, but this is something you might

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be seeing in your code from time to time.

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Down the bottom you see our little red thing pop up.

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So we go to the console that will give us more information as saying the variable crash effect of crash

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detector is not been a That's because Rick forgot to go back over into the Barry script, the crash

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detector script, see how we've got crash effect.

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I need a drag crash effect right onto there to say this is now referencing that I made such a big deal

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about references before than I went and forgot to reference this.

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Now when we click on play it actually knows what to trigger when we crash.

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So crash bump.

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There we go.

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Okay, one thing you'll notice as we move, the particle effect is moving with us.

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Do we want that?

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Do we want the the crunch to be following or staying in the world?

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I think I want to try having it stay in the world.

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So if I crash just here, then the crash particle stages there rather than flowing along with me.

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So we'll just try that.

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We'll see what works better.

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If you click on Crash Effect, there's a setting in here which is simulation space.

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You see it right near the top or right near the top of all of our modules, simulation space, change

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that from local to world, which means that the particle effects will stay wherever they are in the

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world.

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They won't continue to travel along locally, in other words, locally with Barry.

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So let's see if that look is any different.

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Kind of might be the same, to be honest.

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So we'll go crash kind of stays in the world and but for now I think that's fine.

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Okay so we're now triggering our particle effects when we go through the finish line and when we go

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bump.

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And you've learned how to use the play method when it comes to particle systems.

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Okay.

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I'll see you in the next lecture.