WEBVTT 00:06.780 --> 00:07.840 Welcome back. 00:07.860 --> 00:14.850 Now, in this video, we're going to very quickly see how hard it is to fight all these enemies with 00:14.850 --> 00:18.210 ora's measly little one fireball attack. 00:18.210 --> 00:26.520 But we're going to do our best to defeat them all, because I'd like to encounter a specific problem. 00:26.520 --> 00:30.750 I won't say bug, because it's really just something we haven't implemented yet. 00:30.750 --> 00:36.360 And that is what happens when we destroy or kill our enemies. 00:36.360 --> 00:40.110 What's happening from their behavior tree standpoint. 00:40.890 --> 00:47.670 So I'm going to press play and I'm going to do my best to just defeat all of my enemies before they 00:47.670 --> 00:53.250 defeat me, especially those ones that launch projectiles. 00:53.250 --> 00:53.520 Right? 00:53.520 --> 00:54.880 Those are the worst. 00:54.900 --> 01:01.140 I always try to get those projectile launchers before everything else because they just sit back and 01:01.140 --> 01:04.240 they try to hurt you and it's really annoying. 01:04.260 --> 01:04.530 All right. 01:04.560 --> 01:06.380 Now, here's what I'm talking about. 01:06.390 --> 01:07.110 Look at this. 01:07.110 --> 01:08.700 Those enemies are dead. 01:10.170 --> 01:13.300 And after they're dead, they're still firing. 01:13.320 --> 01:15.120 So why is that? 01:15.300 --> 01:17.640 Well, if we open our behavior tree. 01:17.670 --> 01:21.840 Notice we're never checking to see if the enemy is dead. 01:21.870 --> 01:27.660 The enemy doesn't even know from the behavior tree standpoint whether it's dead or not. 01:27.690 --> 01:32.850 We're going to need a blackboard key that we can set whenever our enemy dies. 01:32.880 --> 01:37.540 And that way the behavior tree will know if the enemy has died yet. 01:37.560 --> 01:39.420 So pretty simple fix. 01:39.420 --> 01:40.920 We're going to go to our blackboard. 01:40.920 --> 01:43.710 We're going to add a new key selecting BOOL. 01:43.830 --> 01:48.090 We're going to just call it dead and we're going to check this key. 01:48.120 --> 01:52.890 We're going to check it right here before doing anything else in this selector. 01:53.010 --> 01:56.610 So I'm going to right click and I can add it right here. 01:56.610 --> 02:00.660 And before I do, I notice that I really could name these nodes. 02:00.660 --> 02:06.090 This one is checking, hit, reacting, making sure hit reacting is not set. 02:06.090 --> 02:12.940 I'm going to change the node name to say am I not hit reacting? 02:14.680 --> 02:17.780 And this one is checking if Target to follow is set. 02:17.800 --> 02:19.330 I'm going to say. 02:20.940 --> 02:23.160 Do I have a target? 02:24.060 --> 02:25.650 And we'll add one more. 02:25.680 --> 02:29.490 It's going to be a decorator blackboard based. 02:29.490 --> 02:32.250 And I'm going to rename this one right away. 02:32.580 --> 02:36.180 Am I alive with a question mark? 02:36.420 --> 02:38.500 Now this one's going to check Dead. 02:38.520 --> 02:40.950 So Blackboard Key will be dead. 02:40.980 --> 02:45.010 And we don't want to continue unless dead is not set. 02:45.030 --> 02:47.100 In other words, dead should be false. 02:47.130 --> 02:51.540 Now, if this condition changes, I want to abort everything immediately. 02:51.540 --> 02:59.170 So I'm going to change notify observer to on value, change and observer aborts self and lower priority. 02:59.190 --> 03:01.300 In other words, I'm going to select both. 03:01.320 --> 03:06.630 So it's going to abort the entire tree if the enemy becomes dead. 03:06.660 --> 03:12.950 Now we just need to set this blackboard key and we can do that when the enemy dies from C plus plus. 03:12.960 --> 03:15.600 So I'm going to save all and close the editor. 03:15.660 --> 03:21.010 So I'm going to go into Ora Enemy and find its die function. 03:21.010 --> 03:22.000 Here it is. 03:22.000 --> 03:24.670 And we don't care about the multicast handle. 03:24.670 --> 03:27.910 Death function only die is what matters. 03:27.910 --> 03:29.290 That's what's called in the server. 03:29.290 --> 03:32.170 And for enemies, we're going to set that blackboard. 03:32.170 --> 03:33.100 Key value. 03:33.130 --> 03:34.570 How did we do this before? 03:34.570 --> 03:38.890 Well, if we go to possessed by, we can see how we're setting a value as BOOL. 03:38.890 --> 03:43.360 We're going to copy that line there and we'll go back to the die function. 03:43.360 --> 03:45.040 Paste that line here. 03:45.070 --> 03:51.760 We should have a valid AI controller, but we'll check just in case if or AI controller. 03:53.260 --> 03:58.090 And the value that we want to set is the blackboard key dead. 03:58.090 --> 04:00.970 And we want to set it to true if we've just died. 04:01.150 --> 04:07.930 So that should set that blackboard key and that should prevent us from doing anything in the blackboard. 04:08.230 --> 04:11.380 So we can go ahead and compile and launch the editor. 04:12.750 --> 04:14.400 And we can test this out. 04:14.400 --> 04:20.440 I'm going to go ahead and just kill some of these enemies, especially those ranged attackers. 04:20.460 --> 04:26.580 Let's see if we can kill them first before I get taken out. 04:26.820 --> 04:30.630 It's actually becoming a little bit more challenging, isn't it? 04:30.660 --> 04:34.740 Now that we have more enemies, it's a little harder. 04:35.880 --> 04:38.160 We're going to need some more powerful spells. 04:38.160 --> 04:39.930 I need some aoe spells. 04:39.930 --> 04:41.100 That would be nice. 04:41.100 --> 04:41.730 Okay. 04:42.310 --> 04:46.060 And I'm not getting fired at and that enemy has died. 04:46.060 --> 04:48.220 So it looks like we've done our job. 04:49.100 --> 04:50.000 Excellent. 04:50.270 --> 04:55.100 So as I was saying, it's becoming harder to fight these enemies without getting damaged. 04:55.100 --> 05:02.150 Now, that means we need a way for aura to get more powerful, gain more stats, gain more abilities, 05:02.150 --> 05:03.650 level up her abilities. 05:03.680 --> 05:07.850 It would be nice if our fireball could level up and get more powerful. 05:07.850 --> 05:11.960 It'd also be nice if we had some more area of effect skills. 05:11.960 --> 05:17.300 So we're going to need to do that and we will be doing that throughout the rest of the course. 05:17.390 --> 05:21.890 But more importantly, what happens when we kill an enemy, right? 05:21.920 --> 05:24.120 We should be gaining experience. 05:24.140 --> 05:28.310 We currently don't have a way to know what our experience is. 05:28.340 --> 05:31.250 We don't have a way to know what level we are. 05:31.280 --> 05:34.370 We need that sense of progress, right? 05:34.370 --> 05:41.090 We need to know that we're getting stronger, which means whenever we destroy or kill an enemy, we 05:41.090 --> 05:44.620 should see some kind of experience gauge go up. 05:44.630 --> 05:49.830 And once that experience gauge reaches a certain threshold, we should level up. 05:49.830 --> 05:52.830 And that means we should get more power. 05:52.830 --> 05:57.570 We should be able to open our attribute menu and spend attribute points. 05:57.570 --> 06:01.830 Remember, this top row is reserved for attribute points. 06:01.830 --> 06:04.800 That's something that we still haven't implemented yet. 06:04.830 --> 06:09.060 Our character has a level that's also something we haven't implemented. 06:09.060 --> 06:14.430 So these are the things that we need to make sure we have in our game. 06:14.430 --> 06:21.360 And once we're gaining experience and getting progress and gaining attribute points, then we can start 06:21.360 --> 06:24.320 thinking about expanding our spell repertoire. 06:24.330 --> 06:31.320 We can create a spell menu with a spell tree and gain spell points when we level up, and that will 06:31.320 --> 06:37.680 give us the opportunity to implement things like leveling up our abilities, creating newer, more powerful 06:37.680 --> 06:39.840 abilities and so on. 06:39.930 --> 06:46.500 And with those newer, more powerful abilities, we're going to discover different techniques that we 06:46.500 --> 06:51.930 can use with our gameplay abilities, including opportunities to create gameplay. 06:51.930 --> 06:59.640 Cuz the last missing piece of this gas puzzle and that is going to really give us the sense that we're 06:59.640 --> 07:08.820 playing an actual RPG game Once we have the ability to create that fun cycle where you're gaining progress, 07:08.820 --> 07:15.540 getting more powerful, killing more powerful enemies and the cycle continues for now. 07:15.540 --> 07:18.330 Great job and I'll see you in the next video.