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‫Hello and welcome.

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‫In this lecture, we're going to be looking at spawning a muzzle flash so that when we hit the trigger,

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‫we get a particle effect.

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‫So let's dive in and see how we can do this from C++.

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‫Okay.

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‫So we want some particle effects to spawn from the muzzle of our gun.

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‫What's going to be the best way to do this?

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‫We kind of first of all, have a look at what particle effects we've got available here.

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‫I've taken the ones from the shooter game.

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‫Obviously, you can use any particle effects that you want.

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‫You can find them on the asset store.

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‫You can take them from example projects like I have.

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‫We want to go under the effects.

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‫So asset packs, shoot game effects and then look at particle systems, weapons, assault rifle.

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‫And I'm looking for the muzzle one at least initially.

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‫And we want this assault rifle.

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‫And you should be able to see it's going to take a little bit of time to get the shaders in here compiling.

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‫But this is what essentially the muzzle flash looks like.

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‫It looks like a muzzle flash.

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‫So that's what we're going to be using and we're going to try and spawn this in C++ when we have the

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‫trigger pulled.

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‫So let's go over into our gun.

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‫I'm going to go to the gun.

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‫CP And instead of this log message of having been shot, not particularly useful, we want to spawn

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‫a particle effect.

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‫And to do this, we're going to be using a function from the gameplay statics.

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‫So let's go over to the gameplay static start and have a little look in here.

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‫We want to spawn an emitter, they're calling it spawn an emitter.

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‫And you will see if we have a look at this that what it's taking in is a world context object.

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‫It's taking in a particle system, which is the emitter template, as they're calling it, the location,

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‫rotation, scale, blah, blah, blah, blah, blah.

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‫Or alternatively, I think you can make it attached so we can do a spawn emitter attached, and this

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‫is going to try and attach it to a component so we can see that this takes in a scene component to attach

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‫to.

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‫Now, in this case, I think this is what we want.

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‫It depends on the particle effect in question.

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‫But some particle effects are going to keep spawning particles for a duration of time.

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‫So you want those particles to keep coming out of the muzzle of the gun.

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‫As the gun moves, they might be creating some smoke, some stuff like that.

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‫If you move your gun while you're shooting, you want the particle effect to move with it.

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‫So that's what we're going to be using is this spawn emitter attached.

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‫And as it says here, it's going to take in the emitter template and the scene component that we need

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‫to attach to.

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‫So those are the things that we're mostly going to be needing.

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‫It also has this attach point name that's going to be a socket.

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‫So that's actually quite handy for us to know that we can attach it directly to the muzzle of our gun.

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‫We don't need any kind of offsets, so let's have a look at that.

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‫If I go and open up my BP rifle, we already know we've mentioned that this is a skeletal mesh.

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‫So I'm going to go and find that rifle in the content browser and open up the rifle mesh.

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‫And what you'll see over in the left, if you have the skeleton tree pane visible, then you're going

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‫to see that we've got this rifle route, we've got the rifle magazine, which presumably can be swapped

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‫out or something, but we don't particularly interested in that.

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‫And then there's this muzzle flash socket.

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‫So that's where we're going to spawn our muzzle flash.

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‫If it didn't have or your mesh doesn't have this, then you can go ahead and add one because we can

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‫always add sockets in the way we've seen in previous lectures.

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‫So let's have a go at spawning this.

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‫The first thing we're going to need is one of these particle system references, and the best way to

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‫do that again, the best way that I know how is to create a new property and do it in blueprint.

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‫There are other ways you can do it by named references, but I really don't like using named references.

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‫They break easily if you rename stuff, so much easier to do it in blueprint where all of that is handled

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‫for you.

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‫We're going to make this a you property edit defaults or actually this could be edit anywhere y because

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‫if we were to change this during gameplay which you might want to do, if you're trying to tweak things

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‫and say, oh, well, does this particle effect look better than this one, then this would actually

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‫work.

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‫The next time you shoot, a different particle effect would be created.

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‫And then the type of this needs to be a U.

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‫Particle system pointer, which we're going to call our muzzle flash like that.

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‫And that's what we're going to be setting up over in Blueprint.

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‫And let's go back in to our pull trigger method in the C++ and we want to call it that U gameplay statics

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‫function.

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‫So U gameplay statics notice it's not auto completing here because I need a hash include for this by

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‫hover over that gameplay static so you can see that it's under engine classes.

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‫Kismet gameplay static.

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‫So all we need to do is kismet gameplay static stage and we should have you game play statics to auto

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‫complete from and we want to spawn and this may or may not work because of the version that I'm in in

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‫unreal.

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‫We want to spawn the emitter attached and we want this muzzle flash right here.

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‫And we want to attach it to a scene component.

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‫In this case, we want to attach it to to our guns mesh and we want to attach it to the appropriate

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‫socket, which, again, I'll let you fill out is the if we go over to the gun, it is the muzzle flash

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‫socket.

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‫I'm going to copy it from there directly and just put a semicolon on the end of the line to top it off.

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‫So this should work.

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‫Let's go over and hit compile in the engine.

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‫And once that's finished compiling we can go over into our BP Underscore Rifle Open the full blueprint

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‫editor I just prefer to deal with that and look at our let's see if we go to the root.

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‫In fact, the actor itself or the class defaults go to the details pane.

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‫You can see we've got this muzzle flash property, the new one, and we need to find a particle effect

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‫in here.

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‫I'm going to look for the keyword muzzle.

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‫Let's see.

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‫Maybe muzzle was not the one we were looking for.

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‫It's assault rifle MF.

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‫I think so.

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‫Muzzle flash.

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‫Is that what it's standing for?

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‫So assault rifle.

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‫MF That's the one we want to compile and save that.

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‫And we'll go over into our sandbox and hit play and see if shooting indeed launches up our muzzle flash.

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‫And you can see that it is continuously shooting at the moment.

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‫So we do want it to just be a single muzzle flash.

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‫So I think I'll actually choose a different muzzle flash.

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‫I think I'll use the one from the Wraith asset pack, which we've got sniper and primary.

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‫I'm going to choose the primary just because I'm not wanting to create a rapid fire weapon.

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‫That's a slightly different way of doing things.

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‫It's not not massively different, just more of a kind of once you're holding, you start the emitter

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‫and once you are finished with it, you want to close it down.

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‫In that case, we just want to launch that emitter one time.

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‫So we're going to do ULP again and see if we there we go, now we shoot, we get a single flash of the

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‫muzzle and everything is hunky dory.

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‫It seems to be attached nicely to the end of the gun as well as I move around, wherever I move around,

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‫whichever way I face the muzzle flashes in the right direction.

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‫Cool.

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‫Well, this is really starting to look more like a shooter game with particle effects.

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‫So in the next lecture, we're going to look at the first steps of ray tracing, which will be actually

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‫to go and reach up to our character owner for some information.

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‫I will see you there.