WEBVTT 00:08.170 --> 00:09.250 Welcome back. 00:09.250 --> 00:15.490 We're continuing with Fireblast, and in Fireblast I'd like to call our blueprint Callable function 00:15.490 --> 00:17.320 Spawn Fireballs. 00:17.320 --> 00:19.450 We made this blueprint callable function. 00:19.450 --> 00:21.730 It doesn't really do anything yet. 00:21.730 --> 00:24.400 That's what we're going to change in this video. 00:24.400 --> 00:30.580 Notice it returns an array of fireball object references for our convenience. 00:30.940 --> 00:33.760 What we need to do is actually spawn some fireballs. 00:33.760 --> 00:40.780 So we're going to close the editor down and go into aura Fireblast to implement this function. 00:40.780 --> 00:45.760 Now I'm going to go ahead and close out of Aura projectile as well. 00:46.180 --> 00:50.920 And here in aura Fireblast let's start thinking about how we're going to do this. 00:50.920 --> 00:53.800 Now I'm going to want to spawn 12. 00:53.800 --> 01:00.310 I say 12, it's a variable, so we could change it, but I'm just going to say 12 of these fireballs. 01:00.310 --> 01:05.860 And I'd like them all spaced out evenly and to go out in all directions. 01:05.860 --> 01:14.110 So we have a nice function to calculate evenly rotated rotators or evenly spaced rotators. 01:14.110 --> 01:20.680 If we go into Aura Ability System library, there's a function to get those rotators that I need. 01:20.950 --> 01:22.540 And that would be. 01:24.560 --> 01:26.720 Evenly spaced rotators. 01:26.810 --> 01:28.790 I'm going to call this function. 01:28.790 --> 01:34.190 So here in our fireblast I'm going to go ahead and just move that down. 01:34.190 --> 01:38.150 And I'm going to use you or ability system library. 01:38.750 --> 01:42.980 Evenly spaced rotators and see what this needs. 01:42.980 --> 01:44.960 Now it needs a forward vector. 01:44.960 --> 01:49.250 So I'm going to need to get my avatar actors forward vector. 01:49.800 --> 01:58.920 I can make a const f vector called forward, and I can get avatar actor from actor info and call get 01:58.920 --> 02:01.170 actor forward vector. 02:01.170 --> 02:04.830 If I want to do that, then I don't have to pass this big huge thing in. 02:04.830 --> 02:06.780 I can just pass in forward. 02:07.980 --> 02:12.960 Now it also needs an axis, and the axis is going to be the up vector. 02:12.960 --> 02:19.530 I don't see any reason to spawn these out in any direction other than parallel to the ground. 02:19.530 --> 02:23.010 So I'm going to use f vector up vector. 02:24.300 --> 02:25.500 Now we need a spread. 02:25.500 --> 02:33.510 And if I want evenly rotated rotators all around Ora, then the spread is going to be 360 degrees. 02:33.510 --> 02:35.640 So I'm going to pass in 360. 02:36.120 --> 02:41.220 And the number of rotators is going to be my variable num fireballs. 02:41.220 --> 02:42.900 So I'm going to pass that in. 02:45.100 --> 02:51.880 Now this function is going to give me in return a t array of f rotators. 02:52.180 --> 02:57.250 So I'm going to store that in a local variable called rotators. 02:58.400 --> 03:05.120 And after this I have evenly spaced or evenly rotated rotators and I can loop through rotators. 03:05.120 --> 03:12.950 I can say for const f rotator, reference rotator and rotators. 03:15.180 --> 03:18.570 And for each rotator I can spawn a projectile. 03:18.990 --> 03:24.690 So this is great because now I can spawn a projectile and give it a rotation, and that's going to already 03:24.690 --> 03:26.700 be pointed in the correct direction. 03:26.970 --> 03:30.870 So let's go ahead and spawn some of these. 03:31.170 --> 03:40.350 I'm going to create an A or a fireball pointer and call this fireball and use spawn actor deferred. 03:40.380 --> 03:48.000 So get world spawn actor deferred and use a or a fireball as the class. 03:48.000 --> 03:50.460 And we need to pass in the class to spawn. 03:50.460 --> 03:52.470 That's going to be my fireball class. 03:52.500 --> 03:58.980 Now it needs a spawn transform so I can go ahead and calculate an F transform. 04:00.510 --> 04:06.120 We'll call it Spawn Transform and I can take Spawn transform. 04:07.250 --> 04:08.930 And set its location. 04:09.680 --> 04:12.740 So where do I want to spawn this fireball? 04:12.770 --> 04:20.030 Well, I want to spawn it at my avatar's location, so I'm just going to cache off that vector up here 04:20.030 --> 04:23.360 at the top const vector location. 04:23.360 --> 04:28.130 And it's going to be get avatar actor from actor info get actor location. 04:28.130 --> 04:33.050 Just because that's a lot to type and I'd rather just pass in location here. 04:34.180 --> 04:35.650 Now for the rotation. 04:35.650 --> 04:37.030 We're going to use our rotator. 04:37.030 --> 04:41.290 So we're going to say spawn transform dot set rotation. 04:41.470 --> 04:43.120 We're going to use rotator. 04:44.110 --> 04:47.020 Now this does have to be a quaternion. 04:47.200 --> 04:49.180 So we can call quaternion there. 04:49.180 --> 04:52.750 And with that we can pass in our spawn transform. 04:53.500 --> 05:02.050 Now for the owner we can set the owner of this fireball to be the owning actor from the actor info. 05:02.050 --> 05:06.160 So we can call get owning actor from actor info and pass that in. 05:06.160 --> 05:09.520 And at this point I'm going to start putting these on their own lines. 05:11.650 --> 05:16.090 And the next input is going to be the instigator. 05:16.090 --> 05:18.550 And that's going to be my avatar. 05:18.550 --> 05:22.480 So that's how I'm going to define those inputs. 05:22.480 --> 05:27.970 And after that we need a collision handling override I'm always going to spawn. 05:27.970 --> 05:32.770 So I'm going to use e spawn collision handling method. 05:33.340 --> 05:34.720 Always spawn. 05:35.180 --> 05:41.870 Now spawn actor deferred is complaining because it wants a pawn here, so we can't just pass in an actor. 05:41.870 --> 05:43.130 But that's okay. 05:43.130 --> 05:50.360 If you want, you can pass in null or you can get the current actor info, not activation info, but 05:50.360 --> 05:55.220 current actor info because here we have a player controller. 05:55.220 --> 06:00.590 Player controllers have the function get pawn so you can get the pawn from the player controller like 06:00.590 --> 06:01.100 that. 06:01.100 --> 06:02.270 No problem. 06:02.570 --> 06:05.450 Okay, so we're calling spawn actor deferred. 06:05.990 --> 06:13.670 After we spawn the actor deferred, we need to set the effect parameters on this fireball, which means 06:13.670 --> 06:21.110 we need to make some effect parameters so we can call make damage effect params from class defaults. 06:21.110 --> 06:23.270 And we don't have a target actor. 06:23.270 --> 06:28.970 That's something that we have to take into account when our fireball overlaps with something. 06:28.970 --> 06:31.550 So we have to pass in null pointer for that. 06:31.550 --> 06:37.940 We also don't know the radial damage origin and we don't have a knockback direction to override, nor 06:37.940 --> 06:44.150 do we have a death impulse or a pitch that we'd like to use as an override at the moment. 06:44.150 --> 06:54.170 So what we can do here is just pass in no params, and we can go ahead and store this in an f damage 06:54.170 --> 06:55.580 effect params. 06:55.910 --> 06:58.550 We'll call this effect params. 06:59.460 --> 07:01.680 Actually we'll call it damage effect params. 07:01.680 --> 07:04.020 And we can set this on our fireball. 07:04.020 --> 07:09.930 So we can say fireball damage effect params equals damage effect params. 07:09.930 --> 07:14.310 And in fact this intermediate local variable is unnecessary. 07:14.310 --> 07:16.290 We can just call the function. 07:17.160 --> 07:24.090 Now with that we're just about ready to finish spawning, but we can go ahead and create an array that 07:24.090 --> 07:29.070 we want to return from this function and add this newly spawned fireball to it. 07:29.070 --> 07:35.520 So if we'd like to do that, we can create this array at the top T array A or a fireball. 07:35.520 --> 07:36.780 That's pointers. 07:36.780 --> 07:39.000 And we'll call this fireballs. 07:39.420 --> 07:42.000 And we can add fireball to it. 07:43.870 --> 07:46.660 Fireballs dot add fireball. 07:47.500 --> 07:51.010 And by the end, we can return fireballs. 07:52.060 --> 07:58.960 And with that, we're now ready to finish spawning so we can call fireball. 07:59.950 --> 08:01.300 Finish spawning. 08:02.200 --> 08:03.040 Passing in. 08:03.040 --> 08:03.340 Spawn. 08:03.340 --> 08:04.300 Transform. 08:05.870 --> 08:10.100 And with that we have a function that will spawn our fireballs. 08:10.400 --> 08:12.710 So I'm going to restart the editor. 08:13.730 --> 08:16.280 And get my ability back open. 08:16.550 --> 08:20.240 So here's BP fireball, here's my fire blast ability. 08:20.240 --> 08:22.250 We're calling spawn fireballs. 08:22.250 --> 08:25.580 And really we can just give this a try. 08:25.580 --> 08:27.770 So I'm going to go ahead and save all. 08:27.770 --> 08:30.680 Press play and press the two key. 08:32.190 --> 08:33.150 Now we can't tell. 08:33.180 --> 08:35.130 But there are 12 of them. 08:35.160 --> 08:36.210 There should be. 08:36.210 --> 08:40.680 But really, there's no way to know unless we move them somehow. 08:40.680 --> 08:43.200 Now we do have the projectile movement component. 08:43.200 --> 08:49.350 So really, if we did add some initial speed and max speed, we could see them fly out. 08:49.350 --> 08:57.000 So giving them that speed and then we could come back and change some of these properties like auto 08:57.000 --> 08:58.200 activate. 08:58.200 --> 09:01.920 And we could start with tick enabled. 09:03.410 --> 09:06.470 And now if we launch, they go out. 09:09.300 --> 09:10.740 So it looks great. 09:13.120 --> 09:16.390 And we can even see what it looks like with a higher velocity. 09:17.480 --> 09:19.100 Say 1200. 09:23.930 --> 09:24.980 Pretty nice. 09:26.340 --> 09:29.340 And just because I can, I'm going to set it to 1600. 09:33.820 --> 09:34.660 Nice. 09:34.660 --> 09:35.770 Very nice. 09:36.430 --> 09:42.610 Now this is great, but I want those fireballs to come back and I want them to explode when they come 09:42.610 --> 09:43.300 back. 09:43.300 --> 09:46.480 So that is what I'm concerned with next. 09:46.480 --> 09:54.010 And after that, we're going to want them to also cause damage to anything that they come into contact 09:54.010 --> 09:55.300 with as well. 09:55.840 --> 09:56.860 Excellent. 09:57.220 --> 09:58.330 Awesome job. 09:58.330 --> 10:02.050 And we'll continue in the next video.