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In this lecture, we're going to wrap up the main functionality for this section of the course by adding

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in a boost.

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When I drive over this yellow thing, I go a little bit quicker and then when I bump into anything else,

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I go slower than I was going before.

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So let's implement our speed up and our slow down mechanism.

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I'm going to give you a couple of starting pieces for this and then give you a pretty meaty challenge

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to sink your teeth into.

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So first thing I do in the hierarchy is right click to the object and I'll create a sprite, which will

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be a Oh, make this a circle, I think just to make it look a little bit different and I'll call this

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a speed up.

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Now, where's the speed up in my scene?

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Double click.

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It'll take me right to it.

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It's underneath a tree because that where was that was the middle of the camera when I added this into

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the scene.

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I want to hit w move this over to the left.

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I think it's under my road, so I need to put it up, say five in the order.

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Change the color.

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I think yellowy orange kind of thing makes sense.

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Maybe a yellow.

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And so I don't have to drive too far.

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I'll be lazy.

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I'll put it right over near where my car is at the moment.

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So there we go.

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Probably make it just a tiny bit bigger, hitting R and scaling it up a little bit.

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There we go.

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That's a speed up thingy that when I drive over it, I wished to speed up.

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Now I'm going to open up my driver script.

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Everything we do can be done in driver in this case, and I'm going to give myself two more serialized

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fields up at the top here.

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So Serialize Field will get a float and I'll call this slow speed.

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It's going to represent how slow we go when we bump into something.

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I'll initialize that at 0.1 F just the same as move speed.

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At the moment, I don't know what it actually is in the game.

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If I click on Cruising MC Drive, we've probably modified this in the inspector, so it's currently

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hidden.

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We open that up and currently the move speed is 20.

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Okay, so my initialization is way off in there.

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Will make this 24 slow speed and I'll just while I'm here, this won't change anything.

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But just in case we do some updates for our code, I'm just going to make that 20.

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And you know what?

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Slow speed will make 15 a little bit slower than the regular old move speed.

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Now I'm going to add a next serialised field and this will be of type float and we'll call this boost

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speed.

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How much do we want?

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Boost B will say 30 F as a starting point.

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So we've got this concept now, these variables.

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One is our general old.

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Here's how fast we're going to be moving and we're using that throughout our code just down in here.

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And the other is how slow we're going to go or how fast we're going to go and save that up.

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And with that done, I'm going to give you a big challenge.

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That big a challenge is going to be to create a boost and bump system.

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So boosts are triggers.

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We've just put one of these into our scene.

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If you look at this thing here, this is what I mean by this boost thing.

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It's going to be a trigger.

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So some things you need to do to that.

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But I want that to speed up the player.

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When we drive over it, we're going to have bumps and bumps are going to be colliders, which slow down

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the player.

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I'm pretty much going to make everything else in my world, all these other things, houses and trees

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and stuff.

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If I bump into them, I'm going to slow my vehicle down.

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That'll be my approach.

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With that, you could make separate things that you bump into, which slow the player down if you wanted

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to like witches, hats or cones that you place around.

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And we can do all of this in our driver script.

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So there's other ways you could do this in the future, but for now, we're just going to do it all

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in.

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Driver You might want to use a tag.

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And the other little hint I'll give you here is remember our on events so on trigger enter for example,

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we might want to be playing around with those sorts of things and essentially what we're doing is changing

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move speed to be either slow speed or boost speed depending upon what happens, depending upon whether

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we trigger something or bump into something.

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We want to be changing what the value of move speed is.

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So there we go.

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It's a little bit of a trickier challenge, so be sure to give it a shot.

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This is how you learn by sitting there and staring at it and trying to figure it out.

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But if you get really stuck, then you're more than welcome to watch my approach, which I'll go through

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after you come back from giving it your best shot.

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So pause a video and I'll see you back here when you've given a good old try.

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Rightio.

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So I need to in my driver script, I need to get rid of Start because we're not actually using that

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at all are we.

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Start don't need you.

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What we do need to have in here is some on events so on trigger into remember the two.

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RD So you're not crazy like Rick for getting the two?

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RD I can just hit tab that will auto complete remove the private because I tend not to like it and then

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give myself a little bit of extra formatting in here.

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What are we going to be doing without triggering?

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Well, it's really similar to the delivery.

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So if we jump over to our delivery script and scroll down, you can see that we've got if the tag relates

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to something, then we do some things.

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So let's put an if statement in our driver dot.

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So if tag equals equals and I haven't created this yet, but we'll put in parentheses and then boost.

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So we need to create that in a moment.

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So if it equals boost, then curly braces.

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Let's just for now debug dot log and we'll say are you are boosting man okay just to make sure that

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it works before we do any more of our logic, save that up, hop back over into unity.

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And I need to make sure that when I run over this guy here, it's got all the things it needs on it.

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So what does it need?

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Well, it needs to have a collider for a start.

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So we'll choose a circle collider to RD.

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We need to make that a trigger very important.

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We don't need to put on a rigid body because we don't want to be bouncing it around.

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It's just going to stay there where it is and we also need it to be tagged.

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So I'm going to add a new tag, which I will click the little plus button and call this boost with a

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capital B, click on Save.

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Now I need to click back on my speed up again and I will change the tag to B Boost.

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Now we'll see if that works.

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When I click on play, I can drive, drive, drive and we should print out the console something down

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here, which we didn't.

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So once again, Rick's made a mistake.

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Let's see what we've done here on trigger into two 2D.

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Yes.

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Okay.

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So the mistake I made sorry I was going through this a little bit too quickly and not paying attention.

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It's not tag equals boost, is it?

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If we go back to delivery wins, says other tag, why is it other?

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Well, when we collide with something, we're getting this information passed in.

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And don't worry if you don't understand passing in and parameters and stuff yet, we'll do that a lot

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more throughout this course.

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But for now we just need to know we're getting information about others, so it needs to be other dot

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tag.

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Okay.

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And you know what?

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A lot of my mistakes, I make a few, I edit them out.

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But every now and again I like to keep them in.

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Just so you can see the thought process I'm going through if errors come up because I guarantee there's

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going to be issues and errors.

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Even if you're following along with what I'm doing, you're going to type something a little bit wrong

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or miss it.

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So it's good to know that process.

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Also good to know that folks like myself do that as well.

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Okay, so when I drive over this oak, you are boosting, man.

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Perfect.

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Okay.

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What does it mean to boost?

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Well, sort of debugging that.

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We don't need that anymore.

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As cool as it was, we want to be changing our speed.

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So currently we have move speed equals something and we're using move speed in here.

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So we run over the boost.

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When I say move, speed equals boost speed.

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Okay.

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So basically whatever is stored in boost speed is going to be shoved in to move speed.

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So if we're currently storing 30, that will be what is shoved into or assigned into move speed.

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So let's save back to unity.

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We'll see if that actually worked.

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Click on play.

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Sometimes it's good to test these things with a really huge value because let's see, do I feel like

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I'm going faster?

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Yes, I felt like I was going a little bit faster.

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And it's going to stay that speed now because I haven't done anything to stop it going that quick.

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But that certainly feels like it's going 30.

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How can we tell if I click on Cruise in my drive?

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There's probably Move Speed somewhere.

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Yeah, move.

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Speed is now at 30, the same as boost speed.

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If I click play then move.

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Speed will return back to the 20 that it was excellent.

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So we have created ourselves to speed up, but we want to make sure that we stop speeding up if we bump

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into something like a crazy person.

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So that's the other thing I'm going to do in here is going to be on collision, enter to DX, get rid

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of private and just do a little bit of reformatting here.

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My particular style, you don't need to follow it.

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Okay, hit tab and then I'm going to what what I want to do in here.

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Well, if I bump into something, it's just a simple case of saying move speed equals slow speed.

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So we're going to assign the value of slow speed to become the value of move speed.

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Save that.

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And this is if we bump into anything at all.

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So if you want to have it a little bit more specific, then you would need to use some tags or need

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to use some other ways of doing that.

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But I'm just going to say, if you're crazy enough to bump into anything, then you deserve to go a

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little bit slower, click on play and make my windows a little bit bigger, I think.

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Okay, did the dirt get a little bit of a run up here, bump into that loop and then bump into that?

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You can see there's definitely a difference.

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Now I'm going slow and bumping into everything.

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Now I'm going fast.

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Now going slow.

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Oh yeah, cool.

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So it's definitely working.

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We've got a way that we can go faster when we hit a speedy thing and we've got a way that we can go

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slower when we bump into any sort of collision and slow our vehicle.

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Down again.

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And also, you can see I'm green at the moment, so our package stuff still working.

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And you can also see that I'm pretty bad at driving in my own game.

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Okay, so that's the core functionality I wanted to implement in my game.

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We can drive around a car, we can pick up packages, we can deliver the packages, we can change the

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colour to give visual feedback, the packages disappear.

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We can bump into things without collision.

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We can trigger things to go quicker, we can bump into things to go slower.

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And all in all, we've got a fun little game that you could build upon and take in a whole bunch of

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different directions.

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So that's all of the main content I wanted to cover in this section.

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Great work.

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I look forward to seeing what you've created.

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Please do share with us what you've got and I'll see you in the next lecture.