WEBVTT 00:06.970 --> 00:07.900 Welcome. 00:07.900 --> 00:10.330 In this video, we're going to make an infinite. 00:10.360 --> 00:15.520 Gameplay effect, which means our effect actor should have an infinite gameplay effect. 00:15.570 --> 00:16.890 To subclass of. 00:16.900 --> 00:19.390 So we're going to go ahead and add one. 00:19.600 --> 00:22.040 I just copied duration gameplay effect. 00:22.060 --> 00:26.470 Class and I'm going to name this one infinite gameplay effect class. 00:26.590 --> 00:28.670 And with that I'm going to hit. 00:28.690 --> 00:31.090 Debug, compile and launch. 00:32.920 --> 00:36.460 And here in the editor, I'd like to make a new gameplay effect. 00:36.520 --> 00:44.380 I'm going to go to Blueprints Actor Potion and it's time, I think, to organize these a bit. 00:44.410 --> 00:49.030 I'd like to have a folder for the health and mana crystals. 00:49.030 --> 00:53.860 So here in Actor, I'm going to make a new folder called Crystal. 00:54.460 --> 01:03.940 And from Potion I'm going to move the health crystal, the mana crystal and crystal heal and Crystal 01:03.940 --> 01:04.720 Mana. 01:04.750 --> 01:09.130 With all of these selected, I just held control and left clicked on them. 01:09.130 --> 01:14.590 I'm going to move them over to the crystal folder, select move here and that way our potions are here, 01:14.620 --> 01:17.350 our crystals are here and here in Actor. 01:17.350 --> 01:21.640 I'm going to have a new type, so I'm going to create a new folder. 01:21.640 --> 01:26.710 And for this one I'm going to call it areas. 01:28.210 --> 01:31.660 Or just area rather, and you'll see why. 01:31.670 --> 01:36.070 I'd like to make something that spans across an area. 01:36.070 --> 01:38.760 So I'm going to right click and make a new blueprint class. 01:38.770 --> 01:41.140 I'm going to make an aura effect actor. 01:41.140 --> 01:47.770 And for this I'm going to call this BP underscore fire area. 01:48.460 --> 01:53.680 And for fire area, I'm going to add a box component. 01:53.680 --> 01:57.610 So I'm going to search for box, get a box collision there. 01:57.940 --> 02:02.590 And in addition to this, I'd like to have some fire. 02:02.590 --> 02:12.340 So I'm going to add a Niagara particle system component and call this fire effect and fire effect gets 02:12.370 --> 02:14.260 a Niagara system asset. 02:14.380 --> 02:17.140 I'm going to choose in fire. 02:19.220 --> 02:26.870 So here we have a fire Niagara system and a box that will occupy an area. 02:26.870 --> 02:28.520 Now, this is kind of cool. 02:28.520 --> 02:36.800 If I drag one of these out into the world, my BP fire area, we see that it has fire and I'm going 02:36.800 --> 02:39.440 to go ahead and move it a little closer to my player start. 02:40.380 --> 02:43.140 So we have a fire area here. 02:43.140 --> 02:51.450 And for the fire area, I'd like to apply an infinite gameplay effect when the character is overlapping 02:51.450 --> 02:58.950 with it and an infinite gameplay effect is never removed, at least until you remove it manually. 02:59.070 --> 03:01.740 So that's kind of what I want to do for the fire. 03:01.770 --> 03:06.750 So in order to remove an infinite effect, that's going to require some thought. 03:06.750 --> 03:11.070 But for now I'd like to just apply the infinite effect and see what happens. 03:11.070 --> 03:15.570 So here in my area folder, I have my fire area. 03:15.600 --> 03:20.880 I'm going to right click and make a new blueprint class based on gameplay effect. 03:22.560 --> 03:31.200 And call this GE underscore fire area and open fire area and this will be an infinite gameplay effect. 03:31.200 --> 03:39.300 So duration policy will be infinite and we now need to decide what to do when we apply this effect. 03:39.330 --> 03:46.080 Well, I'd like this to be periodic, so I'm going to go up to the period and I'll give this a period 03:46.080 --> 03:47.520 of one second. 03:47.520 --> 03:51.450 So every second will be applying any modifiers. 03:51.450 --> 03:58.860 And speaking of modifiers, we'll add one and the modifier is going to affect the health attribute. 03:58.860 --> 04:01.920 It's going to use an additive operator. 04:01.920 --> 04:03.300 And what are we going to add? 04:03.300 --> 04:07.380 We're going to add a negative value so we can subtract from the health. 04:07.680 --> 04:11.880 I'm going to subtract five from the health every second. 04:12.360 --> 04:14.190 So we have the fire area. 04:14.190 --> 04:15.780 Let's compile and save. 04:15.780 --> 04:20.950 And here in BP fire area, I'm going to select BP Fire Area Self. 04:20.970 --> 04:23.530 Here's my infinite gameplay effect class. 04:23.530 --> 04:28.690 I'm going to choose GE Fire area and now we need to apply it. 04:28.780 --> 04:37.960 So here in the blueprint event graph, I'm going to get my box right click on component, Begin Overlap 04:37.960 --> 04:40.330 and I'm going to simply apply my effect. 04:40.330 --> 04:43.390 So apply effect to Target. 04:43.570 --> 04:44.860 I'm going to hook that up. 04:44.860 --> 04:52.000 Plugging in the other actor for Target actor and I'm going to get my infinite gameplay effect class 04:52.000 --> 04:56.260 and hook that in and I'm not going to destroy the actor. 04:56.260 --> 05:00.520 So on overlap we apply an infinite gameplay effect. 05:00.700 --> 05:02.080 So what happens? 05:02.080 --> 05:06.040 Let's go and find out if we overlap with this area. 05:06.040 --> 05:13.000 I'm going to press play and I'm going to overlap with the fire and there's my health going down every 05:13.000 --> 05:14.290 second It's going down. 05:14.290 --> 05:15.220 Now here's the problem. 05:15.220 --> 05:22.000 If I leave the area, well, the effect is still applied and if I show debug, we see health going down 05:22.000 --> 05:24.970 into the negatives, it's never going to stop. 05:24.970 --> 05:31.480 So if we do apply an infinite gameplay effect, it's up to us to remove that effect. 05:31.480 --> 05:37.840 And so in this video we're going to learn how we can do that and we'll handle this on the C plus plus 05:37.840 --> 05:44.800 side of things as this is one of those things that I feel makes more sense to handle in C plus plus. 05:44.800 --> 05:51.730 So what I'm going to do is I'm going to close the editor, save all, and let's think about how we're 05:51.730 --> 05:55.630 going to handle these gameplay effects in our effect. 05:55.630 --> 06:04.120 Actor Depending on which ones are set here, now we need to think about how we'd like to handle applying 06:04.120 --> 06:08.530 our different types of effects because we have an instant effect. 06:08.530 --> 06:12.520 We have a duration effect and we have an infinite gameplay effect. 06:12.700 --> 06:20.590 We have to decide how the aura effect actor is going to apply and or remove these effects. 06:21.130 --> 06:27.340 And I'd like to be able to change how the actor applies the effects from the blueprint. 06:27.350 --> 06:30.700 I want this to be nice and flexible and configurable. 06:30.760 --> 06:42.180 So what I'd like to create is a policy, an enum for the effect application and the effect removal. 06:42.190 --> 06:50.440 So we'll have an effect application policy, essentially a setting that we can set that determines whether 06:50.440 --> 06:57.610 we apply any of these effects on overlap or on end overlap and so on. 06:57.730 --> 07:01.330 So let's create an enum up here at the top. 07:01.510 --> 07:03.760 We're going to make a scoped enum. 07:03.760 --> 07:10.390 We're going to say Enum class E, and this is going to be our Effect application policy. 07:10.390 --> 07:16.240 So we're going to say E effect application policy. 07:17.590 --> 07:21.160 In other words, how are we going to apply the effect? 07:21.160 --> 07:24.160 And it's going to be a U enum. 07:26.630 --> 07:34.250 We're going to make it blueprint type and the constants for our policy will be apply effect or just 07:34.250 --> 07:36.860 apply on overlap. 07:37.760 --> 07:42.440 We can have apply on end overlap. 07:43.490 --> 07:45.950 We can have do not apply. 07:45.950 --> 07:51.350 And if we create a variable of this type for each of these, we can set it in the blueprint. 07:51.350 --> 07:57.170 For example, we can have an effect application policy for the instant effect. 07:57.170 --> 08:02.870 So we can call this instant effect application policy. 08:03.780 --> 08:06.060 And we can make this edit anywhere. 08:06.180 --> 08:15.570 So I'm going to give it a new property, make it edit anywhere and it can be blueprint read only category 08:15.570 --> 08:16.620 applied effects. 08:16.620 --> 08:19.890 So really I'll just copy this property from up there. 08:20.100 --> 08:22.770 So we have one for the instant effect. 08:22.800 --> 08:25.260 We can have one for the duration effect as well. 08:25.260 --> 08:31.740 So I'll copy and paste it here and have a duration effect application policy. 08:31.740 --> 08:38.100 And then we can also have a infinite effect application policy. 08:38.250 --> 08:43.440 Now, in addition to the application policy, I'd like to have a removal policy as well. 08:43.440 --> 08:46.350 So I'm going to copy this enum and paste it here. 08:46.350 --> 08:49.890 And this will be effect removal policy. 08:49.890 --> 08:52.890 So we're going to replace application with removal. 08:53.740 --> 08:55.750 And we'll delete those constants. 08:55.750 --> 08:59.350 And what are the removal policies that we want here? 08:59.350 --> 09:07.660 Well, we can have remove on and overlap and we can also have do not remove. 09:07.990 --> 09:16.270 Now, a removal policy really only applies to an infinite gameplay effect because a duration based gameplay 09:16.270 --> 09:18.220 effect is going to remove itself. 09:18.220 --> 09:22.420 It handles that on its own, but for an infinite effect. 09:22.450 --> 09:28.810 We're going to want to either remove it when we end overlap or simply never remove it. 09:28.810 --> 09:33.370 So we'll only have an effect removal policy for the infinite gameplay effect. 09:33.370 --> 09:42.790 So we'll go ahead and add that and it's going to be infinite effect removal policy. 09:44.270 --> 09:46.880 And it gets an edit anywhere. 09:46.910 --> 09:49.830 Blueprint read only category Applied effects. 09:49.850 --> 09:57.380 So now we have these application and removal policies and we can check these when we apply our effects. 09:57.500 --> 10:02.680 So now we're going to need a different way to handle applying our effects. 10:02.990 --> 10:08.690 We're going to want to apply the instant effect by checking our instant effect policy. 10:08.690 --> 10:13.300 And if that policy is do not apply, then we're not going to apply that effect. 10:13.310 --> 10:18.380 And in fact, I think that do not apply is a pretty good default value for each of these. 10:18.560 --> 10:26.480 So I'm going to set instant effect application policy to effect application policy do not apply and 10:26.480 --> 10:28.010 I'm going to set all of them to this. 10:28.010 --> 10:35.120 So duration effect application policy do not apply and infinite also do not apply. 10:35.120 --> 10:42.140 And for the effect removal policy for the infinite effect, I'm going to give this one a default value 10:42.140 --> 10:42.860 as well. 10:43.170 --> 10:46.050 Now we could have it set to do not remove. 10:46.050 --> 10:50.070 I'm going to have it set to remove on end overlap by default. 10:50.400 --> 10:57.540 And now that we have these enums, I think we can have a pair of functions for when we begin and end 10:57.540 --> 11:02.100 overlap that we can call from the blueprint that can just handle these things. 11:02.100 --> 11:05.720 And really all this function needs is to receive a target actor. 11:05.730 --> 11:08.790 I don't think we really need to pass in the effect. 11:08.820 --> 11:11.040 We just need to have those effects set. 11:11.040 --> 11:14.040 And this actor can access its own effects. 11:14.220 --> 11:22.560 And before I make these two functions, I'm going to add a Boolean so that we can destroy our actor 11:22.560 --> 11:25.490 after the effect has been removed if we want to. 11:25.500 --> 11:33.120 So let's make a bool first called be Destroy on effect removal. 11:33.960 --> 11:41.700 We'll set it to false by default and we'll make it edit anywhere Blueprint read only category applied 11:41.700 --> 11:44.330 effects like so. 11:44.330 --> 11:47.360 And now we can add those functions that we want. 11:47.570 --> 11:54.530 So I'm going to make two functions, one for overlapping and one for end overlapping. 11:54.530 --> 12:01.010 And we'll just call these from the blueprint when something overlaps with whatever volume that we decide 12:01.010 --> 12:02.870 to add to our blueprint. 12:02.870 --> 12:07.070 So this will be a void function and we're going to call this simply on overlap. 12:07.070 --> 12:12.890 And this is only going to take an actor and we'll call it target actor. 12:14.880 --> 12:22.620 And we'll also have an on end overlap that takes an a actor called Target Actor. 12:23.400 --> 12:26.380 And we can just call these from Blueprint. 12:26.400 --> 12:32.760 So I'm going to make them blueprint callable, give them the new function with Blueprint callable, 12:32.760 --> 12:36.150 and I'll go ahead and generate the definitions for these. 12:36.390 --> 12:38.430 There's on overlap. 12:40.170 --> 12:46.140 Here is on and overlap and we'll decide which effects to apply and when. 12:46.170 --> 12:48.240 Based on their application policies. 12:48.240 --> 12:50.280 And we're going to do that in the next video. 12:50.310 --> 12:51.930 We'll continue this then. 12:51.930 --> 12:55.140 So great job and I'll see you in the next video.