WEBVTT 00:06.930 --> 00:08.010 Welcome back. 00:08.040 --> 00:14.850 Now we have a projectile spell and a projectile, but our projectile really doesn't do anything except 00:14.850 --> 00:15.990 fly through the air. 00:16.020 --> 00:20.310 So in this video, we're going to make sure something happens when it hits something. 00:20.400 --> 00:27.450 So for that, we're going to go into actor and or a projectile and we'll open up the CPP and header 00:27.450 --> 00:30.660 files and I'm done with my combat interface. 00:30.690 --> 00:36.900 Now, yes, we're going to want to cause damage and I want to use a gameplay effect for that and we'll 00:36.900 --> 00:37.800 get to that. 00:37.800 --> 00:45.240 But for now, I'd like to at least make sure that we take care of the cosmetics involved with a projectile 00:45.240 --> 00:52.080 hitting something that's going to involve a at least effect Niagara system and a sound. 00:52.080 --> 00:58.280 So we're going to have a couple of variables on the projectile for those things and those can be private. 00:58.290 --> 01:05.040 So we're going to have a T object pointer and this will be for our Niagara system. 01:05.040 --> 01:08.830 So I'm going to use you Niagara system. 01:08.980 --> 01:16.210 Now, I'd like to include a forward declaration up there for Niagara system and I'm going to call this 01:16.240 --> 01:17.650 impact effect. 01:18.250 --> 01:20.860 Now we're using you Niagara system. 01:20.860 --> 01:29.260 So I'd better go to Aura, build X and add Niagara to my dependencies here. 01:29.260 --> 01:37.270 So I can go ahead and add that right here to my private dependency module names Niagara like so, so 01:37.270 --> 01:42.460 I can go ahead and save that, close it out and we have an impact effect. 01:42.490 --> 01:47.440 Now my impact effect is going to need a new property. 01:48.320 --> 01:50.630 And we want to set this from the blueprint. 01:50.660 --> 01:52.340 We'll make it edit anywhere. 01:52.550 --> 02:00.440 Now, in addition to the impact effect, I want a sound, so I'm going to use T object pointer of type 02:00.470 --> 02:02.300 u sound base. 02:02.840 --> 02:09.320 Use sound base will allow me to use any type of sound that I want, whether it's a sound cue or a meta 02:09.320 --> 02:09.720 sound. 02:09.740 --> 02:11.240 We're going to use meta sounds. 02:11.360 --> 02:16.580 So I'm going to call this impact sound and again, add it anywhere. 02:16.610 --> 02:18.520 So when do we play these? 02:18.530 --> 02:26.840 Well, obviously when our projectile is destroyed or when it overlaps with something, that's one circumstance. 02:26.840 --> 02:30.700 And we're going to want to destroy the projectile when it hits. 02:30.710 --> 02:31.220 Right? 02:31.220 --> 02:37.760 So here in our on overlap function, on sphere overlap, currently nothing's happening. 02:37.850 --> 02:43.130 But what I'd like to do is play the sound and spawn the effect. 02:43.160 --> 02:52.800 So to play the sound, we use gameplay statics so I can use you gameplay statics play sound at location. 02:53.310 --> 02:56.730 Now we're going to need to include gameplay statics. 02:56.730 --> 03:03.870 So let's get that up here include and it's in kismet slash gameplay statics. 03:03.910 --> 03:06.720 Not sure why Ryder didn't give me autocomplete there. 03:07.110 --> 03:11.130 Now this function requires a world context object. 03:11.160 --> 03:12.810 We'll pass in this. 03:12.840 --> 03:17.520 It also needs the sound we'll pass in impact sound. 03:17.670 --> 03:24.630 After that, we need the location, so we'll go ahead and use our actor location, get actor location. 03:24.780 --> 03:26.280 It needs a rotation. 03:26.280 --> 03:32.040 We'll just go ahead and use F rotator zero rotator. 03:32.130 --> 03:37.200 And after that it has a whole bunch of optional parameters we don't need to pass in. 03:37.530 --> 03:39.660 So that takes care of playing the sound. 03:39.660 --> 03:47.820 We also want to spawn a Niagara system and for that we use use Niagara function library and we'll use 03:47.820 --> 03:50.330 spawn system at location. 03:50.510 --> 03:54.200 Now for this, it's very much like spawn sound at location. 03:54.200 --> 03:56.450 We pass in a world context object. 03:56.450 --> 04:03.560 We pass in the impact effect for the system and we need a location and a rotation. 04:03.560 --> 04:09.470 In fact, we don't necessarily need a rotation, we just need the location and the rest are optional. 04:09.470 --> 04:11.750 So we're going to use get actor location. 04:13.570 --> 04:15.700 So this happens on overlap. 04:15.700 --> 04:21.790 And if we're on the server, I'd like to destroy the projectile, but that's something the server I 04:21.790 --> 04:23.190 think should handle. 04:23.200 --> 04:29.290 So we're going to check if has authority and if we do have authority, we're going to destroy. 04:29.530 --> 04:37.600 Now, there's a very unlikely event that this act of destruction could replicate down to the client 04:37.600 --> 04:45.070 before the client has had the chance to have its on sphere overlap function called, in which case the 04:45.070 --> 04:50.710 projectile would be destroyed before it could go ahead and play the sound and spawn the system. 04:50.710 --> 04:54.700 So what we can do here is an on sphere overlap. 04:54.700 --> 05:02.110 If we overlap before being destroyed on the client, what we can do is we can set some kind of boolean 05:02.110 --> 05:04.900 and say we've already taken care of these effects. 05:04.900 --> 05:11.740 And then once the act of destruction has replicated, we can check that boolean and see if we've already 05:11.740 --> 05:12.670 played those effects. 05:12.670 --> 05:14.390 And if not, we can play them. 05:14.570 --> 05:15.950 So here's what I'd like to do. 05:15.950 --> 05:17.990 I'd like to have a Boolean. 05:18.200 --> 05:21.230 It can be private, a bool called Be Hit. 05:21.260 --> 05:25.910 We'll set it to false and in or a projectile if we don't have authority. 05:25.910 --> 05:32.630 So we'll have an else case here we're going to set be hit equal to true and then we can override a function 05:32.630 --> 05:36.200 that gets called when our actor is destroyed. 05:36.200 --> 05:38.210 That's a public function. 05:38.210 --> 05:44.900 We can say virtual void destroyed and we can override destroyed. 05:44.900 --> 05:50.420 So before calling super destroyed, we can check if B hit. 05:52.070 --> 05:56.690 And we want to play the sound and spawn the system. 05:56.690 --> 06:04.820 If destroyed is called before on sphere overlap, in which case be hit is going to be false. 06:04.820 --> 06:07.490 So we're going to say if not be hit. 06:07.850 --> 06:12.020 But also this only really pertains to clients. 06:12.020 --> 06:18.170 So we're going to say if not be hit and not has authority. 06:19.080 --> 06:23.570 And in that case, we'll go ahead and play the sound and spawn the system. 06:23.580 --> 06:26.820 So on sphere overlap will happen on the server. 06:26.820 --> 06:31.160 We'll get those cosmetic effects and then we'll check for authority. 06:31.170 --> 06:34.890 We'll have it and we'll call destroy and that's it. 06:35.160 --> 06:38.550 And on the client, one of two things will happen. 06:38.550 --> 06:44.880 First, either on sphere overlap will happen first or the act of destruction will replicate down to 06:44.880 --> 06:45.720 the client. 06:45.720 --> 06:47.460 And that will happen first. 06:47.580 --> 06:53.360 Now let's just say that destruction replicates before the clients on sphere overlap. 06:53.370 --> 06:59.670 Well, in that case, be hit will be false and has authority will be false. 06:59.670 --> 07:06.420 So we'll play those effects and the actor will be destroyed and on sphere overlap will never be called. 07:06.780 --> 07:13.350 But in the case that on sphere overlap is called before destruction replicates, then we get those effects. 07:13.380 --> 07:15.660 We check for authority and fail. 07:15.660 --> 07:23.350 We get into the if statement and say be hit equals true, so we'll get those effects regardless. 07:23.380 --> 07:28.480 Now on sphere overlap should not be called after destroyed has been called. 07:29.030 --> 07:36.200 So now we should be able to see and hear some effects when our projectile hits something and we see 07:36.200 --> 07:41.550 that it's set to overlap world, dynamic, world static and pawn. 07:41.570 --> 07:47.840 So why don't we go ahead and compile and launch and see if we can find some assets to use? 07:50.210 --> 07:53.090 Okay, so let's find our projectile. 07:53.120 --> 07:55.280 Blueprint in blueprints. 07:55.700 --> 07:58.400 And I believe this is an ability system. 07:58.430 --> 07:59.780 Gameplay abilities. 07:59.780 --> 08:01.520 Fire firebolt. 08:01.520 --> 08:03.620 And it's our firebolt. 08:03.650 --> 08:05.000 Here's our projectile. 08:05.300 --> 08:08.960 Now we have a couple of assets to set here. 08:09.110 --> 08:13.760 We have impact, effect and impact sound. 08:14.270 --> 08:16.610 Now let's look at our assets folder. 08:18.470 --> 08:21.020 We'll go to Effects projectiles. 08:21.020 --> 08:23.430 And here we have a fire explosion. 08:23.450 --> 08:24.500 There's two of them. 08:24.710 --> 08:26.450 Let's check out one of them. 08:26.810 --> 08:28.220 Here's what it looks like. 08:29.200 --> 08:31.300 And we have a second one. 08:31.920 --> 08:33.540 Here's what that looks like. 08:34.880 --> 08:36.470 So they both look pretty good. 08:36.770 --> 08:38.180 So we can choose one. 08:38.180 --> 08:40.520 I'm going to browse to one of them. 08:40.520 --> 08:42.590 I'll actually select the second one. 08:42.590 --> 08:45.770 And here for impact effect, I'll set it there. 08:46.580 --> 08:48.020 Now for the impact sound. 08:48.020 --> 08:49.610 Let's see what sounds we have in assets. 08:49.610 --> 08:54.950 We'll go to assets, sounds, abilities, firebolt. 08:54.950 --> 08:57.500 And we have some sound effects. 08:57.500 --> 08:59.150 Here's one for launching. 09:00.320 --> 09:04.880 Here's SFX Firebolt impact and then we have a hiss. 09:06.030 --> 09:10.350 And that's a looping sound that we can attach to our projectile. 09:10.380 --> 09:12.380 But for now, let's use our impact sound. 09:12.390 --> 09:13.680 I'm going to select it. 09:14.400 --> 09:15.750 And set it there. 09:16.140 --> 09:18.510 And now we can just test this out. 09:19.330 --> 09:20.710 So I'm going to press play. 09:21.830 --> 09:23.240 I'm going to click on an enemy. 09:26.070 --> 09:31.980 And it looks like we hit something on the way and we hit something and the sound effect has an attenuation 09:31.980 --> 09:33.030 set for it as well. 09:33.030 --> 09:37.200 So it's going to sound quieter the farther away it is. 09:37.500 --> 09:39.660 Now, I think we hit a potion. 09:39.900 --> 09:45.870 Yeah, I think we hit a potion and that actually consumed the potion, funnily enough. 09:46.140 --> 09:52.440 So we'll have to configure our collision settings exactly how we want, but at least we see that we've 09:52.440 --> 09:57.810 got our effect for when our fireball hits something and it looks like it's working. 09:58.050 --> 09:58.920 Excellent. 09:58.950 --> 10:05.160 Now, we saw that we had another firebolt sound called SFX Firebolt. 10:05.700 --> 10:08.820 We can use that in our attack animation. 10:09.000 --> 10:14.100 So what I'd like to do is go to aura animations abilities. 10:14.100 --> 10:19.740 I'm going to go into my cast firebolt montage and play a sound in here. 10:19.830 --> 10:30.430 So I'm going to go ahead and add a new notify track called Sound and right here I'm going to add a notify 10:30.460 --> 10:31.630 play sound. 10:32.110 --> 10:36.790 And select SFX Firebolt. 10:39.020 --> 10:43.130 Like so and saving all. 10:43.460 --> 10:44.870 I'm going to try it out. 10:46.860 --> 10:48.420 First on the client. 10:51.900 --> 10:52.800 Nice. 10:52.800 --> 10:54.840 And on the server. 10:55.380 --> 10:57.660 Nice Looking good. 10:57.960 --> 11:05.910 And the last thing to do is to spawn a sound effect and attach it and make sure it's looping. 11:06.060 --> 11:10.860 We can attach it to the firebolt itself so we can have a looping sound. 11:11.190 --> 11:14.220 And that's going to be your quest. 11:14.550 --> 11:20.010 So for this quest, you're going to add a looping sound for your projectile. 11:20.280 --> 11:26.940 So add the looping sound, take care of what you need to take care of in C plus plus and in blueprint, 11:26.940 --> 11:28.860 choose a looping sound effect. 11:28.860 --> 11:33.990 And when you're done, play test and make sure that it looks and sounds great. 11:34.110 --> 11:37.500 So pause the video and conquer this quest now. 11:41.030 --> 11:41.630 All right. 11:41.630 --> 11:43.340 I'm going to close the editor. 11:44.350 --> 11:46.540 And go back to Aura Projectile. 11:46.840 --> 11:49.510 Now we're going to want a looping sound. 11:49.540 --> 11:54.040 So I'm simply going to copy impact sound and paste another one. 11:54.220 --> 11:56.800 And this will be our looping sound. 11:57.340 --> 12:00.600 Now we want to spawn a sound and attach it. 12:00.610 --> 12:07.810 So if we go back to Aura Projectile, we can go into Begin play and spawn a sound here with you. 12:07.810 --> 12:14.440 Gameplay Static's spawn sound, but we can spawn one attached. 12:14.440 --> 12:18.910 So this allows us to spawn the sound and attach it. 12:18.910 --> 12:25.600 And this function returns a sound component that we can store so that we can stop the sound later. 12:25.750 --> 12:28.360 So first we need to pass in the sound. 12:28.360 --> 12:30.280 That's going to be our looping sound. 12:30.460 --> 12:33.950 Next, we need a scene component to attach to. 12:33.970 --> 12:38.530 I'm just going to call get root component so we can attach it to the root. 12:38.560 --> 12:41.870 Now it takes a number of optional parameters. 12:41.890 --> 12:48.310 We can literally leave them all out and spawn sound attached will spawn the sound. 12:48.340 --> 12:51.140 Now it returns a new audio component. 12:51.160 --> 12:57.580 I'd like to store that in a variable so we can stop the sound in on sphere overlap. 12:57.580 --> 13:02.410 So let's get a u audio component pointer variable. 13:02.410 --> 13:14.560 So this will be a T object pointer of type u audio component called looping sound component and this 13:14.560 --> 13:16.810 will get its own U property. 13:17.020 --> 13:18.130 There we go. 13:18.280 --> 13:26.320 So spawn sound attached and similar functions in gameplay statics spawn a sound and return a component. 13:26.320 --> 13:32.410 So this is one of those few cases where we're creating a component that doesn't live on an actor. 13:32.440 --> 13:36.450 Usually components live on actors, but this one does not. 13:36.460 --> 13:39.580 It's just a component floating around in the world. 13:39.580 --> 13:45.050 But we can store that in our audio component, which we called looping sound component. 13:45.050 --> 13:46.520 So we'll store that. 13:46.520 --> 13:55.360 And then in on sphere overlap as we're playing the sound for impact and spawning the system for impact, 13:55.370 --> 13:57.580 we'll go ahead and stop the sound. 13:57.590 --> 14:08.330 So looping sound component we're going to call stop and when destroyed, we'll call stop here as well. 14:08.510 --> 14:09.860 Let's test this out. 14:12.480 --> 14:14.340 So let's open our actor. 14:19.260 --> 14:21.720 And we'll search for looping. 14:21.750 --> 14:23.570 Here's our looping sound. 14:23.580 --> 14:28.170 We'll set it to SFX Firebolt Hiss. 14:29.290 --> 14:31.330 And let's see how this works. 14:31.450 --> 14:33.760 We'll try first on the client. 14:37.520 --> 14:39.530 And I hit something right away. 14:40.520 --> 14:42.230 I'll try on the server now. 14:44.330 --> 14:46.520 So it looks like the sound is stopping. 14:46.520 --> 14:49.160 Let's make sure that it's actually playing though. 14:50.660 --> 14:52.640 Oh, yeah, we can definitely hear that. 14:53.870 --> 14:55.370 That sounds great. 14:55.370 --> 15:00.290 And that fireball just went off into the distance and it's never going to die. 15:00.560 --> 15:05.480 So we should probably set the life span on our actor. 15:05.810 --> 15:11.600 So before we wrap up, I'm just going to go ahead and set a lifespan. 15:11.690 --> 15:17.840 I'll make this a uproperty variable, a float called Lifespan. 15:19.390 --> 15:21.100 I'll set it to 15 seconds. 15:21.100 --> 15:26.290 I think that's plenty and make it edit anywhere. 15:26.290 --> 15:28.540 I'll make it edit defaults only actually. 15:29.020 --> 15:36.040 And as soon as we spawn our projectile, I'm going to set its lifespan right here and begin play. 15:37.030 --> 15:47.950 We'll call set lifespan to lifespan so that way our projectiles will only last for 15 seconds maximum 15:47.950 --> 15:50.320 if they don't get destroyed before that. 15:51.060 --> 15:51.500 Okay. 15:51.510 --> 15:52.470 Great job. 15:52.500 --> 15:54.360 Things are looking awesome. 15:54.360 --> 15:55.950 They're sounding great. 15:55.980 --> 16:00.630 We're now just about ready to start causing damage with our projectiles. 16:01.260 --> 16:03.370 So we'll do that in the videos to come. 16:03.390 --> 16:05.490 Great job and I'll see you soon.