WEBVTT 00:07.560 --> 00:08.720 Welcome back. 00:08.730 --> 00:14.070 Since our section is called Combat Tricks and we're adding more features for combat. 00:14.100 --> 00:18.690 One of the features that I'd like to see implemented in this game is a death impulse. 00:18.720 --> 00:21.300 Now, what do I mean by death impulse? 00:21.330 --> 00:27.870 Well, as soon as I launch a fireball at something, if that fireball was fatal, I'd like to add an 00:27.870 --> 00:29.910 impulse on the character. 00:29.940 --> 00:36.270 Now we're implementing a ragdoll system where when the character dies, it ragdolls. 00:36.270 --> 00:36.930 Right? 00:37.230 --> 00:39.630 We can see that by killing the creature. 00:40.700 --> 00:44.150 And as soon as we've done so, the creature falls down. 00:44.150 --> 00:50.360 But what I'd like to see is the creature to fly back, perhaps bounce off the walls and get some kind 00:50.360 --> 00:51.940 of force applied. 00:51.950 --> 00:56.640 So the death impulse gives death a little bit more oomph to it. 00:56.660 --> 01:00.100 It makes the death a little bit more impactful. 01:00.110 --> 01:01.700 It feels better. 01:01.700 --> 01:07.400 And especially if we're starting to do explosions and cool things with our other abilities we're going 01:07.400 --> 01:08.390 to implement. 01:08.570 --> 01:10.920 A death impulse can go a long way. 01:10.940 --> 01:13.610 So for that reason, we're going to implement it. 01:13.610 --> 01:16.070 And there are quite a few steps to it. 01:16.220 --> 01:23.510 Now, a death impulse is something I believe should be only related to a damage gameplay ability. 01:23.750 --> 01:30.260 So, for example, our Firebolt is a damage gameplay ability, and I'd like to be able to just set a 01:30.260 --> 01:33.050 magnitude here for a death impulse. 01:33.050 --> 01:39.650 I'd like to have a death impulse magnitude, and if I set it here, then I want everything to automatically 01:39.650 --> 01:45.140 work for me so that if I kill something with a Firebolt, I want to see it fly back. 01:45.320 --> 01:47.570 So that's what I'm interested in. 01:47.570 --> 01:53.810 And we're going to get started by adding that parameter in the aura damage gameplay ability. 01:53.810 --> 01:56.330 So let's go ahead and do that. 01:56.450 --> 02:01.130 So I'm going to go into abilities and open aura damage gameplay ability. 02:01.130 --> 02:03.080 And we're going to add a new parameter. 02:03.080 --> 02:04.460 It's going to be a float. 02:04.490 --> 02:07.370 We can leave it at edit defaults only. 02:07.460 --> 02:09.350 I'm going to go ahead and paste it here. 02:09.350 --> 02:14.180 And I'm going to call this death impulse magnitude. 02:14.690 --> 02:17.810 And we'll give it a default value something like 60. 02:17.810 --> 02:21.830 But we'll see what 60 looks like when we implement all this. 02:22.070 --> 02:29.360 Now all we need to do when using this is set the death impulse magnitude and everything else is going 02:29.360 --> 02:30.530 to work, right. 02:30.710 --> 02:36.170 Well, for that reason we need to handle all the stuff that happens under the hood. 02:36.170 --> 02:39.380 And we'll start with our damage effect params. 02:39.380 --> 02:45.440 I think our damage effect params can carry the death impulse magnitude along with it. 02:46.230 --> 02:50.880 So if I go to where we've defined that, it's an aura ability types. 02:50.880 --> 02:54.840 So we can add the death impulse magnitude here. 02:59.320 --> 03:08.110 So we'll make a death impulse magnitude float on our damage effect params. 03:08.110 --> 03:14.980 And what we'll do is set this in our damage gameplay abilities make damage effect params from class 03:14.980 --> 03:17.890 defaults, so we can go to that function. 03:17.890 --> 03:26.320 And all we need to do here is take params dot death, impulse magnitude and set that to the abilities 03:26.320 --> 03:29.380 death impulse magnitude and that's it. 03:29.530 --> 03:35.590 Now once we have this, we need a way to push this along through the pipeline of damage. 03:35.590 --> 03:41.770 And so far we just have one offensive ability that's using damage effect params. 03:41.770 --> 03:44.380 That's our projectile spell. 03:44.380 --> 03:50.620 So if we go to aura projectile spell in the private folder I'm going to go to the cpp file. 03:51.880 --> 03:56.450 Here we're setting the projectile damage effect params here. 03:56.470 --> 04:05.980 Now at this point it's really not meaningful to set a death impulse, as an impulse is a vector, and 04:05.980 --> 04:08.590 a vector is going to depend on a direction. 04:08.590 --> 04:14.350 And while yes, we know the direction our projectile is traveling in and our projectile does travel 04:14.350 --> 04:15.190 linearly. 04:15.220 --> 04:18.430 Pretty soon we're going to make this projectile have gravity. 04:18.520 --> 04:21.250 That means it's going to have a parabolic trajectory. 04:21.250 --> 04:27.100 And because the trajectory changes, it wouldn't be appropriate to set any vector direction at this 04:27.100 --> 04:27.760 point. 04:27.790 --> 04:32.430 It would be more appropriate to set a vector direction when the projectile hits. 04:32.440 --> 04:40.240 So if we go into our actor folder and open aura projectile dot cpp, then at this point an on sphere 04:40.270 --> 04:47.770 overlap, it would be appropriate before applying the damage effect to set some kind of vector based 04:47.770 --> 04:52.600 on the projectiles direction for the death impulse that we can send along. 04:52.600 --> 04:58.930 And how can we send an arbitrary vector along through the pipeline so we can receive it, say later 04:58.930 --> 05:03.130 on, like in the attribute set where we determine if death has occurred? 05:03.160 --> 05:09.640 Well, we know that we have a custom effect context right here in aura ability types. 05:09.670 --> 05:15.520 It's an aura gameplay effect context, and we know how to add new things to it. 05:15.550 --> 05:21.220 We've seen that there's a number of steps involved, and we're going to add a death impulse to this, 05:21.220 --> 05:23.800 and we'll do that in the next video. 05:23.830 --> 05:24.970 I'll see you soon.