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Okay.

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So in this video, we're going to be taking a look at particle emitters.

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And as you would guess, they allow you to emit particles from parts.

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So I'll show you how to use them here real quick.

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I have my part that we got from our last lecture, and I can add an object in here, which is a particle

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emitter.

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And you should immediately see that our part is emitting particles.

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Very cool.

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And there's a bunch of properties in here that we can change.

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We can change the color, the light emission, the size, a whole bunch of stuff We're going to go through

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every single one.

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So first off, obviously you can change the color of your particles like maybe I want mine to be, Oh,

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I don't know.

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How about some red particles?

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There we go.

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We've got some red color particles.

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And of course, you can press these three dots here and actually animate over time what colors you want

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the particles to be.

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So maybe I want them to start off as red and later down the line in the lifetime of the particle.

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Maybe I want it to be more orange.

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Yellow, like some like that.

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So now you can see that my particles slowly throughout their lifetime are fading to become more of this

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orange color.

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The next thing here is light emission, and this is basically how the particles blend with other colors

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in your game.

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So I could set it to like ten, even though the max number for this is one, it'll still work the same.

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I can't really tell what color they are, so I usually just leave this off for now.

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Light influence is basically how you want your particles to be influenced by the lighting in your game.

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So for example, if these particles were like in a very dark area of your game and this light influences

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that one, you basically wouldn't be able to see the particles because it's too dark.

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But if you leave it at zero, then the particles aren't affected by lighting your game at all.

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They will always look like this no matter what light setting your particles are in in your game.

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The next one here is orientation, and this is basically how you want your particles to look.

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So right now it's facing the camera.

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Meaning if I move around this object, you see all the particles follow my camera.

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So they're always looking at me.

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But I can change it to maybe like facing camera world up.

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And basically what this does, it stops the particles from rotating horizontally.

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So as you can see, they're stuck like that.

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But if I put it back on facing camera, you see they still rotate with my camera even if I look down.

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Velocity parallel is pretty similar to facing camera rolled up, but they follow the velocity.

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So if I were to shoot out the particles from the side, they'd do the same effect but sideways and then

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velocity perpendicular.

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They yeah, they do that instead of being parallel, they're not perpendicular to the part that they're

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shooting out of.

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So that's kind of interesting.

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The next simple property is size, of course, so I can change the size.

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Maybe I want the particle to be like, Yeah, huge, huge particles.

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Or maybe I want them to be really tiny.

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I can just sit here and punch in some numbers to change the size of the particles.

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Easy as that.

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And of course, you can also adjust them over the lifetime.

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So maybe at the beginning I want them to be super large and then over time they shrink smaller and smaller.

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And I can click on this line to add extra points where I want to animate.

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So maybe I want to do something like this.

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I don't know.

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See how that looks.

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So they get small and they get big again, and then they get small and then they get big.

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So that's basically how this works.

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I'll just set it to one for now.

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Squash is an interesting one.

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It's basically how much you want them to be horizontally squashed.

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So I'll show an example here.

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If I set it to one, you see our particles got squashed horizontally and it can continue to squash them

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more and more.

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I'm not exactly sure what you want to use this for, but it's there if you want to use it.

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The next one here is texture, and this allows you to change the image of your particles.

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But if your game is published, you can actually add your own images in here and add whatever you like.

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But I'm just going to leave it at the default for now.

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Transparency.

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Pretty simple.

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One is fully transparent, can't see them point five, halfway transparent and zero.

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There is no transparency.

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The offset is basically the distance away.

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Or how should I say, it's basically how far away the particles won't render.

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So if I set this to five, if I'm within five studs of where these particles are being emitted, I won't

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I won't see the particles.

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Like once the particles get further than five studs away from me, then I can start seeing them and

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I can sit here and change how far away I want these particles to render on my screen.

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And the reason they use this is for layering multiple particle emitters together so they don't look

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weird.

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What's the next one?

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We already know what name and parent is emission direction.

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So this is basically what direction you want the particles to emit.

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Right now, that's set to the top, but I can emit from the left side of the part, so it's emitting

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from the left side of the part, or maybe the right side, maybe the front.

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That's just basically how this one works.

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Very simple enabled enables or disables the particle emitter.

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If I turn it off, they're no longer emits particles, turn it back on, it starts emitting particles.

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Pretty simple.

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Lifetime is how long you want your particles to live for.

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So right now it's set from 5 to 10, which basically means these particles will live anywhere from a

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minimum of 5 seconds to a maximum of 10 seconds.

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So I can change this to maybe like one and three.

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And you'll notice that my newly generated particles are living much shorter lifespans.

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The rate how many particles I want to emit.

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If I set it to 50, it's emitting more particles.

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If I set it to 100 a ton more or I could set it to one, it's only emitting one particle a second.

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But if I do ten, here's ten particles a second, 100 particles per second.

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You get the idea rotation.

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This sets a random rotation for the particle.

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So.

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If I set it to like 360, that means when these particles generate, they will be randomly rotated anywhere

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from 0 to 360 degrees.

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So as you can notice, these spikes coming off of these particles are no longer aligned anymore.

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If I were to set it back to zero, you'll see all of them are perfectly pointing up.

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But if I set it back to 360, all the particles will not orient themselves or randomly rotational speed.

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Basically another random thing run out, set to zero.

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But if I set it to like a max of ten now, these particles will rotate anywhere from 0 to 10 degrees

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every second.

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Speed how fast you want the particles to emit out of here.

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So if I set it to like 20 now they're shooting out of here super fast.

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And of course there's a minimum and a maximum, so you can randomize it.

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Maybe you want something to come out at five and you want others to come at it blazing fast speeds.

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Spread angle.

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Another simple one.

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Basically randomize how much of an.

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How much of a spread you want the particles to emit from so like from the x and Y direction if you imagine

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this as a 2D plane.

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So I can set it to like 25, 25.

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So these particles will now emit anywhere from zero to up to 25 degrees in a random direction.

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And of course, I can do all the way up to like 90 degrees.

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So you see some of them are going out horizontally.

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The next one.

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What else?

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We got shape.

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This one's kind of cool.

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It lets you pick the shape of the emitter.

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What does that mean?

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So basically, right now it's set to box.

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So you can imagine that the particle emitter is in here like a box shape and it's emitting particles

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from the top.

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But I continue to like sphere.

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And now that means that this particle emitter.

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Think of a big sphere in here and it's just shooting out particles in all directions and change it to

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like a flat disk.

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So now has just like a disk in there, or you can change it to like a cylinder.

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So think of like a cylinder in here.

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And you can change the shape and out, which basically lets you change.

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If you want the particles to emit away from the shape which is outward, or if you want them to emit

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towards the shape which is inward.

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If I change the transparency here to point seven, you can see that these particles are emitting towards

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the centre of the shape and flying out.

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And if I set it to maybe something like in and out, it'll do a mix of both.

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Some of them will emit inwards and some of them will emit outwards shape partial.

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This is kind of a weird one, but basically kind of I'll put a little diagram up.

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It basically changes the shape of the shape.

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So like if I did 0.5, it kind of like tightens the top of a cone.

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So again, it's a pretty weird property.

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Shape Style is a simple one.

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Basically, whether or not you want the particles to emit from the surface of the object.

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So if I put this back to a box shape, you'll notice that these particles are only emitting from this

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face.

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But if I set it to volume now, they emit from anywhere within the volume of the shape.

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That's just the difference between the two.

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The flipbook flipbook layout, this property allows you to animate particles.

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So what you would do is you would select a grid style and it allows you to fill it up with like different

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sections of pictures that you can change between each one.

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It's like animating.

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Like if you ever seen a flipbook and you run your thumb through it and it looks like an animation,

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that's basically what this does.

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Acceleration.

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Basically accelerate the particles in a particular global direction, like the global x axis is this

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way.

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So I could accelerate the particles in that direction by like maybe like we'll put five here and I'll

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kind of looks like there's a little bit of wind in my game.

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Just a little bit of wind and maybe I can do ten.

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And now we kind of got like a hurricane.

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Or you can do 100.

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Yeah.

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Pretty simple.

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Maybe we'll do 100 in the Y direction.

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Super fast.

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Super crazy.

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That's just acceleration right there.

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Next section, drag.

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Now, this one's kind of cool.

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This basically determines the rate at which the particles will lose their speed.

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So if I put this at, like, five, you'll notice that over time, the particles are losing half of

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their speed.

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So lose half, lose half, lose half, lose half, lose half until it basically stops.

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Lock two.

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This one's kind of interesting.

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So if you notice, if I move my particle emitter around.

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See, the particles are free to move wherever they like.

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But if I do locked apart now, if I move my part around, they are locked to the part.

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There is no free movement for the particles anymore.

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Next is time scale.

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This one's pretty simple.

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Set it at one, which is normal time, but I could set it to like 0.5, which is half of our current

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time set all the way down to like 0.1.

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And now they're moving in slow motion.

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But we'll just leave it at one very simple.

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And then the last property is velocity inheritance.

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This one's a little weird.

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I'm not exactly sure how it works.

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The wiki states that this inherits the velocity of the base part, so basically the part that this particle

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emitter is parented to.

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If this is an unanchored part and it's moving around, it has a velocity, it will inherit that velocity

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in some way.

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But it says that it uses the dot velocity property of a part which is deprecated.

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We no longer use dot velocity, instead we use assembly linear velocity.

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And I was messing around trying to see if this works and I couldn't get it to work so I wouldn't worry

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about this property for now.

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So there's your overview of particle emitters.

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All these properties with numbers you can animate them like the transparency.

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Like maybe I want to fade out over time.

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Check that out.

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So yeah, very cool.

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Particle emitters.