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Welcome.

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In this lecture, I want to show you a neat instance called Trails, and this is where you can add dynamic

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and visually appealing effects into your games.

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Now, a trail is an instance that requires attachments in order to work.

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Specifically, you need to attachments that define the starting and ending point for the trail.

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And for the trail to be emanated, it needs a bass part parent for it to work.

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So we're going to create some attachments in here, and these attachments are going to represent the

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starting and ending point for my trail.

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So specifically for this part, I'm going to move this attachment to be at the very end here and move

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it towards the back.

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And then I can duplicate this attachment and do it at the other end here as well.

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So what you can imagine is that there is a line between this attachment and this attachment going across

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the brick.

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And what I put a trail on this brick.

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It's going to create a line from this point to this point.

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And when I move the brick, it'll have this flat surface or this flat trail coming out of my part.

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So we can add a trail into my part.

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And then I can specify the attachments for the trail.

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So we'll do that one and that one.

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Now what you'll see is that when I move my part, you'll see a trail come out the end.

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Just like that.

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So this is the trail that is emanating from my part.

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Now trails have a bunch of properties in here that we can mess around with and we'll go with the first

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one, which is color.

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Pretty self explanatory.

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We can pick any kind of color we'd like for our trail and we can also change the color over time based

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on the lifetime of our trail.

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But I'm going to leave it.

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I guess that green is fine.

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Inside this trail.

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We can change if we want the trail to face the camera.

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So that means no matter what direction I'm looking at, this part, the trail is always going to be

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oriented towards my camera, just like that.

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So I'll showcase it again.

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Let me just put some trails in here and you can see that the trail is following with an orientation

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towards my camera.

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The next property is light emission and light influence, and these are basically the same for the other

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light emission and light influence properties that we've seen.

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So if I go and set light influence to zero, that means any lighting in my game is not going to have

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an effect on my trail.

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And if I set the light emission to something like one, I'm kind of emitting the blending of colors

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with this particular color here.

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But we'll just leave it at the default.

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We can also apply textures to our trails, so let's demonstrate that we'll go to the home tab and open

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up the toolbox and we can just pick a random image in here.

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We'll just do giga Chad, because why not?

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And then we can paste that texture ID in there.

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We don't need this anymore.

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And now if I move my trail.

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There we go.

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We have green giga Chad.

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And this texture will continue to stretch for however long the duration is and how far my part moves.

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But if you don't want the trail to stretch, that's where these other properties come in.

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So in here we can define a texture length in studs, basically the maximum amount of vertical height

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for our image, and that's only applied if we pick static or wrap for our texture mode.

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Obviously, stretch means that the texture gets stretched and it will ignore this texture like property.

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But if I set to something like static and then move my part, you will see that the texture will repeat

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itself.

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And each texture, its height, is one stud from this point to that point.

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Now, what's the difference between static and rap?

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Well, static means is that when the texture is drawn, you can see they're static and they don't move

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with the part.

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But if I change it to rap when it creates new textures, you can see that these textures are following

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my part.

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They're going along and following the trail.

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That's just the difference between those two.

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And if I go in here and I change the texture length to be something like four studs, you can see that

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change as well.

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So now my image is four studs in height.

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We also have transparency for our trail as well, so we can make it to be completely opaque so you can't

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see through it at all.

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And of course, you can also adjust this over time.

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And then some other settings we have in here is like enabled whether or not the trail is showing up

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pretty easy.

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Lifetime.

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This is how long the trail will last before it decays.

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And of course you can set kind of how long you want this to be upwards of 20 seconds, or you can make

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it really short.

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You can barely see the trail at all because it's decaying and 0.0 1 seconds.

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We can also define the maximum length and the minimum length that our trail has to be.

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So let's say my lifetime was 10 seconds.

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I could set a maximum length for this trail, such as ten studs.

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That way, if my part travels greater than ten studs, the trail won't be larger than ten studs.

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You'll see, my trail is getting limited to a length of ten studs.

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But if I increase it to something like 50.

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Then it should.

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Come longer.

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That I changed the wrong property.

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Oh, it didn't change it.

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50.

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There we go.

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Now you can see that my trail is much longer.

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And we'll set the lifetime back to be something like one second.

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And then we also have something called width scale.

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And this is the scale of our image or our trail from the starting point to the ending point, the two

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attachments.

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So if I change this to 0.5, then it's going to be half the size of our regular trail, as you can see

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right there.

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And of course, you can also adjust this to be different over time.

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So maybe at the beginning my trail can be huge and then it can decay close to nothing over time.

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So if I go and move my part, you can see that my trail shrinks over time.

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Pretty neat.

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Other than that, the trail instance and the Roadblocks API is a very powerful tool for creating visually

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interesting and dynamic effects in your game.

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By using the various properties and methods available, you can customize the appearance and behavior

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of the trail to achieve a wide range of effects to enhance the overall experience for your game.