WEBVTT 00:06.820 --> 00:07.820 Welcome back. 00:07.840 --> 00:12.250 Now we have some demon enemies, but we'd like to summon these. 00:12.250 --> 00:18.970 I'd like this to be part of a special ability for our shaman, where our shaman summons a bunch of little 00:18.970 --> 00:20.200 demon minions. 00:20.350 --> 00:23.710 So for that reason, I'm going to close all of these tabs. 00:24.400 --> 00:32.650 And just to remind you what that summon animation looks like for our shaman, we can go to assets, 00:32.650 --> 00:38.960 enemies, shaman animations and check out Shaman summon. 00:38.980 --> 00:41.410 And this is what it looks like. 00:41.410 --> 00:50.200 So what I'd like is an ability that will play this as a montage, perhaps, and choose a number of points 00:50.200 --> 00:54.580 in front of the shaman at which to spawn little demons. 00:54.580 --> 00:57.730 And those demons can go do its bidding. 00:58.150 --> 01:05.470 So in this video, we're going to get started with that by creating the ability and devising an algorithm 01:05.470 --> 01:09.550 to choose spawn locations for each of these demons. 01:09.550 --> 01:11.830 So let's go ahead and get started. 01:11.830 --> 01:16.480 Now I'm going to need a C plus plus class for a new ability for the shaman. 01:16.480 --> 01:23.290 So I'm going to go to C plus plus classes or a public ability system abilities, and I'm going to make 01:23.290 --> 01:24.670 a new ability. 01:24.670 --> 01:28.630 Now, this particular ability is just summoning creatures. 01:28.630 --> 01:31.210 It's not really spawning projectiles. 01:31.210 --> 01:33.970 It's not really an attack per se. 01:34.000 --> 01:41.560 So I'm going to base this on a gameplay ability as it doesn't really need a damage variable. 01:41.560 --> 01:48.280 So I'm going to right click on aura gameplay ability and create a C plus plus class derived from aura 01:48.310 --> 01:49.540 gameplay ability. 01:49.540 --> 01:53.410 And this is going to be a summon ability. 01:53.440 --> 02:01.930 So I can call this summon ability, we can call it aura summon ability if we want to. 02:01.930 --> 02:06.490 In a sense that aura prefix's most of the things in this game. 02:06.730 --> 02:10.840 So we'll call this aura summon ability, we'll create the class. 02:11.510 --> 02:18.770 And we'll close the editor and I'm going to go ahead and close all tabs here and just open my abilities 02:18.770 --> 02:27.020 folder, get my aura, summon ability open and we can start thinking about what to do with our aura 02:27.020 --> 02:27.890 summon ability. 02:27.890 --> 02:30.770 Now, I don't want to override, activate ability. 02:30.800 --> 02:37.130 What I'd rather do is create a blueprint callable function and script out the ability logic in the blueprint 02:37.130 --> 02:42.170 as we've been doing, as this is the way that gas is meant to be used. 02:42.350 --> 02:49.550 So I'm going to make a nice blueprint callable function to calculate the spawn locations. 02:49.550 --> 02:51.620 So this is a summon ability. 02:51.620 --> 02:54.590 We need an array of spawn locations. 02:54.590 --> 03:01.310 It could be an array with a single element in it, as I'd like, this ability to be sort of configurable 03:01.310 --> 03:02.870 with parameters and all. 03:02.870 --> 03:10.760 So first I'm going to make a public section and we'll make a function that returns a t array of vectors. 03:10.760 --> 03:18.690 So t array of F vector and this is going to be called get spawn locations. 03:18.990 --> 03:27.000 So get spawn locations is how we're going to know where we should spawn our little demon minions. 03:27.000 --> 03:29.880 I'm going to refer to them as minions in this ability. 03:29.880 --> 03:33.150 So that way it's not specific to demons per se. 03:33.180 --> 03:39.960 It's really whatever minion you choose, whatever enemy class or whatever character class you choose 03:39.960 --> 03:40.860 to spawn. 03:40.950 --> 03:48.030 So as far as this ability is concerned, we're going to call that a minion whenever we spawn something. 03:48.210 --> 03:55.320 Now this is going to be a new function with Blueprint Callable and get Spawn locations is going to be 03:55.320 --> 04:02.430 an algorithm that we devise to get a number of locations around our enemy in the front of it. 04:02.580 --> 04:10.500 And I'm going to want several variables to determine how this algorithm is going to behave. 04:10.860 --> 04:13.890 So for one, we need a number of minions. 04:13.890 --> 04:17.760 That's going to be an int 32 called num minions. 04:17.940 --> 04:20.160 It could be num minions to spawn. 04:20.160 --> 04:21.120 ET cetera. 04:21.120 --> 04:30.720 Now I'm going to set it equal to a value by default, let's say five, but this should be configurable, 04:30.720 --> 04:34.410 so it'll be a new property add anywhere. 04:36.780 --> 04:38.160 Category. 04:39.630 --> 04:45.630 And these are all going to be properties under the summoning of Minions. 04:45.630 --> 04:47.640 So we're going to call this summoning. 04:47.850 --> 04:53.730 So we have a number of minions, so we need to know what class to spawn or class is if we're going to 04:53.730 --> 04:59.850 spawn multiple, even potentially different types of enemies or characters. 04:59.850 --> 05:06.720 So we need to have an array and we can make this a t array of characters or pawns, but it should be 05:06.720 --> 05:14.640 a subclass of I'll just make it a T subclass of a pawns that we can spawn and we're going to call this 05:14.640 --> 05:16.020 minion classes. 05:16.650 --> 05:19.620 And of course this needs to be editable. 05:19.620 --> 05:21.900 We'll make this edit anywhere. 05:21.900 --> 05:27.480 In fact, this is a gameplay ability, so I don't see any need to make it edit anywhere. 05:27.480 --> 05:30.330 We can make them edit defaults only instead. 05:30.600 --> 05:33.510 So we have our minion classes now. 05:33.510 --> 05:42.040 I'd like a minimum and maximum for the distance from our shaman or whoever's doing the spawning. 05:42.040 --> 05:47.920 I want a minimum and maximum distance away that we should spawn our minions at. 05:47.920 --> 05:57.520 So I'm going to make a float called Min Spawn Distance and I'll just give it a default value of say, 05:57.550 --> 06:06.250 50 and a float called Max spawn distance and I'll give it a default of say, 250. 06:06.250 --> 06:09.820 And these both also get the same view property. 06:10.740 --> 06:17.850 So we know how many minions, we know how far they should be spawned, but we also need a spread. 06:17.880 --> 06:21.680 I really don't want to spawn these all around the shaman. 06:21.690 --> 06:25.140 I'd rather them all be spawned relatively in front of the shaman. 06:25.140 --> 06:29.220 So I want an angle of spread for spawning. 06:29.220 --> 06:32.520 And I'm going to call this spawn spread. 06:32.550 --> 06:33.690 It's a float. 06:35.480 --> 06:37.580 And I'm going to set this to 90. 06:37.580 --> 06:46.460 So basically we have a 90 degree spread and we'll fan out our spawn locations within that 90 degrees. 06:46.550 --> 06:49.130 But this, of course, will also be editable. 06:49.370 --> 06:49.700 Okay. 06:49.700 --> 06:52.700 So we have a number of parameters and a function. 06:52.730 --> 06:54.560 Let's implement this function. 06:54.560 --> 07:02.600 I'm going to generate a definition and all I want to do is generate this t array and return it, but 07:02.600 --> 07:08.180 also probably draw some debug shapes so we can visualize what this looks like. 07:08.210 --> 07:10.520 Now I'd like to take this in steps. 07:10.520 --> 07:16.450 First, I want to visualize that spread and the minimum and maximum distances. 07:16.460 --> 07:21.680 So the first step I think is to get the actor forward vector. 07:21.860 --> 07:29.150 I'm going to make a const f vector called forward and get the forward vector of the avatar actor. 07:29.150 --> 07:36.180 So I'm going to get Avatar actor from actor info and call get actor forward vector. 07:36.390 --> 07:38.400 So we have the forward vector. 07:38.400 --> 07:41.310 We can also get the actor location as well. 07:41.310 --> 07:48.240 I'll call it location and call get Avatar actor from actor info, get actor location. 07:48.240 --> 07:51.140 So we have forward and we have location. 07:51.150 --> 07:57.720 Now we can rotate vectors, for example, we can take the forward vector and we can rotate it by using 07:57.720 --> 07:59.670 rotate angle axis. 07:59.700 --> 08:05.880 Now if I use rotate angle axis, I have to specify how much to rotate my vector. 08:05.880 --> 08:10.200 Now I can rotate it by half of the spread and that's going to rotate it. 08:10.200 --> 08:14.300 If spawn spread is 90 degrees, it'll rotate it by 45. 08:14.310 --> 08:18.450 So I'm going to take spawn spread and divide by two. 08:18.450 --> 08:24.660 That will give me 45 when spawn spread is 90 and I'd like to rotate about the Z axis. 08:24.660 --> 08:32.130 So what I can do is I can take F vector up vector that gives me the vector pointing up and this gives 08:32.130 --> 08:34.590 me the forward vector, but rotate it. 08:34.590 --> 08:41.550 I'm going to store this in a local variable for now, const f vector and I'll call this left of spread. 08:41.760 --> 08:43.650 So it's to the left of our spread. 08:43.650 --> 08:46.080 It's the left most boundary. 08:46.230 --> 08:51.660 And what I can do is I can draw this as a debug arrow or a debug line. 08:51.750 --> 08:58.500 I like debug arrows as they're directional and there's a way to draw a debug arrow with you. 08:58.530 --> 09:00.360 Kismet System Library. 09:02.650 --> 09:08.830 And the function is draw debug arrow and this requires a few parameters. 09:08.830 --> 09:15.190 First, it needs a world context object we can pass in get Avatar actor from actor info. 09:15.460 --> 09:22.360 Now for the start of the line that's going to be location for the end of the line. 09:22.360 --> 09:26.860 That will be location plus left of spread. 09:29.010 --> 09:36.870 But left of spread is a unit vector as our forward vector is a unit vector, a vector of length one. 09:36.870 --> 09:41.520 So I'm going to scale this and I'd like to scale it by my max. 09:42.630 --> 09:44.090 Spawn distance. 09:44.100 --> 09:49.770 So our line end is location plus left of spread times. 09:49.770 --> 09:51.330 Max spawn distance. 09:51.360 --> 09:54.900 Now, for arrow size, we can just put whatever we want here. 09:54.900 --> 09:57.270 I'm just going to put a four. 09:58.270 --> 09:59.230 Dot f. 09:59.650 --> 10:05.110 Now for the color, I'm going to have a vector for left of spread and right to spread, and I'm going 10:05.110 --> 10:07.910 to make them different colors so we know which one is which. 10:07.930 --> 10:15.100 So for left of spread, I'm going to make it an F linear color with green and then we'll really see 10:15.100 --> 10:18.280 if it's to the left or to the right of the spread or not. 10:18.280 --> 10:20.080 And for the duration. 10:20.110 --> 10:23.860 I'm going to use three seconds. 10:25.890 --> 10:28.860 And there we have our debug arrow. 10:28.980 --> 10:30.450 So we have left of spread. 10:30.450 --> 10:36.590 But I'd like to create another one called Right of Spread and I'd like to rotate it the other way. 10:36.600 --> 10:44.910 So this one I'm going to call right of spread and instead of rotating it by spawn spread divided by 10:44.910 --> 10:51.690 two, we're going to rotate it by negative spawn spread divided by two around the up vector, and we're 10:51.690 --> 10:53.760 going to draw the debug arrow. 10:53.850 --> 10:59.820 But instead of using left of spread, we're going to use right of spread and we're also going to change 10:59.820 --> 11:00.590 the color. 11:00.600 --> 11:04.110 Let's make the color something else like gray. 11:05.770 --> 11:06.130 Okay. 11:06.130 --> 11:09.780 So I think we're going to want to test out how this works so far. 11:09.790 --> 11:16.300 So what we can do is we can choose to return an empty array for now. 11:16.660 --> 11:19.030 So return t array. 11:20.540 --> 11:22.130 Of F vectors. 11:24.560 --> 11:30.170 And we'll just use parentheses there so that we can just return an empty array. 11:30.590 --> 11:33.110 I'm not really concerned with the array just yet. 11:33.110 --> 11:38.810 I just want to take a look at what our geometry looks like for these vectors we've calculated. 11:38.810 --> 11:41.420 So let's go ahead and run and debug mode. 11:42.800 --> 11:44.510 Okay, so we're back in the editor. 11:44.510 --> 11:47.870 We're going to make a blueprint based on our new gameplay ability. 11:47.870 --> 11:51.500 And this will go into blueprints, ability, system enemy. 11:51.500 --> 11:56.660 And really, it doesn't have to go into enemy, but we're going to make one for the shaman specifically. 11:56.660 --> 12:04.910 So we'll go into abilities, we'll right click create Blueprint class and use aura summon ability. 12:06.320 --> 12:12.950 We'll select that and call this GA underscore summon ability. 12:14.100 --> 12:15.720 We'll go ahead and open this. 12:16.450 --> 12:22.840 And when this ability is activated, I'm going to right click and I'm going to call our blueprint callable 12:22.840 --> 12:26.320 function, get spawn locations. 12:26.740 --> 12:30.910 And from there we're just going to see a couple of debug arrows. 12:30.940 --> 12:36.880 Now, if we want to see this actually happen, if we want to see this ability activated, we're going 12:36.880 --> 12:39.190 to have to give it a tag. 12:39.190 --> 12:46.000 If we go to class defaults and for the ability tags, we're going to give it the abilities attack tag 12:46.000 --> 12:50.980 just so that it already works with our behavior tree task attack. 12:50.980 --> 12:55.240 And now we just need to give this to our elementalist enemy type. 12:55.240 --> 13:01.300 So what I'm going to do is go into blueprints, ability system data and open character class info and 13:01.300 --> 13:05.380 for the elementalist instead of the enemy Firebolt. 13:05.380 --> 13:11.140 I'm going to change this to a summon ability so it's not going to fire firebolts anymore. 13:11.140 --> 13:12.880 At least not for now. 13:12.910 --> 13:15.310 Don't worry, it will in the future. 13:15.310 --> 13:17.240 We're just seeing how this works. 13:17.240 --> 13:19.490 We're going to activate the summon ability. 13:19.520 --> 13:22.220 So let's give this a try. 13:22.220 --> 13:28.850 I'm going to remove these demons and just add a shaman. 13:28.850 --> 13:35.690 So we're going to go into the shaman folder, bring that in, and as soon as BT attack the behavior 13:35.690 --> 13:40.910 tree task is executed and it's going to activate abilities by Tag. 13:40.910 --> 13:46.280 And because this has the attack tag, we should see these spawn locations. 13:46.280 --> 13:48.500 So I'm going to save all press play. 13:49.280 --> 13:54.420 And there we see the spread and we see the two different colored vectors. 13:54.440 --> 13:57.560 Now we call the green one left of spread. 13:57.560 --> 14:00.080 And from Ora's point of view, it is the left. 14:00.080 --> 14:03.910 But from the enemy's point of view, that's actually the right, isn't it? 14:03.920 --> 14:07.140 So we kind of got those mixed up. 14:07.160 --> 14:11.720 The first one is the right, the green one, that is. 14:11.750 --> 14:13.590 And the gray one is the left. 14:13.610 --> 14:18.140 So what we can do is rename this one to right of spread. 14:18.500 --> 14:21.020 So the first one is right of spread. 14:21.350 --> 14:25.130 And the second one here, this is left of spread. 14:26.240 --> 14:29.750 So we're going to just swap their names. 14:29.750 --> 14:35.550 And that way we're looking at this from the point of view of the enemy, the shaman. 14:35.570 --> 14:44.180 So that Green Arrow is actually the one to the right, as we can see when playtesting there, that's 14:44.180 --> 14:46.640 the right the gray one is the left. 14:47.850 --> 14:53.520 Okay, so it looks like we have a pretty good max distance. 14:53.550 --> 15:02.190 We could probably up that to about 300 and we can't really see how far away the min distance is, but 15:02.190 --> 15:07.950 I'm assuming we'll probably want to up that to to about maybe 75 to 100. 15:07.980 --> 15:12.420 So we'll just tweak these parameters in some inability. 15:12.420 --> 15:17.850 We'll go to class defaults, but we can always change their defaults in C plus plus as well. 15:17.850 --> 15:25.680 But I'm going to use a min spawn distance of 75 and a max of 300, but I'd like to also take a look 15:25.710 --> 15:29.580 at some debug spheres at those distances. 15:29.580 --> 15:37.440 So what I'm also going to do is after drawing these debug arrows, I'm going to draw debug spheres at 15:37.440 --> 15:43.080 the min and max distances along these lines, right of spread and left of spread. 15:43.110 --> 15:47.130 So I'm going to actually call draw debug sphere. 15:49.060 --> 15:52.060 The first input is the world I'm going to call Git World. 15:52.270 --> 15:54.730 Next, we have the center of the sphere. 15:54.760 --> 15:59.770 Now this is going to be at the location of Location Plus. 15:59.920 --> 16:03.400 And I'm going to add right of spread only. 16:03.400 --> 16:08.350 I'm going to scale right of spread by that min spawn distance. 16:09.850 --> 16:13.090 This way we can visualize how far away it is. 16:13.120 --> 16:15.570 Now, the radius of this sphere can be small. 16:15.580 --> 16:17.530 I'm going to make it about 15. 16:17.530 --> 16:19.450 Number of segments can be 12. 16:19.450 --> 16:22.420 I always use 12 F color can be red. 16:24.220 --> 16:27.130 And persistent lines can be false. 16:27.700 --> 16:29.860 Lifetime can be three seconds. 16:31.480 --> 16:37.300 So we're going to draw that debug sphere, but I'm also going to draw another sphere at the max distance. 16:37.300 --> 16:42.910 So I'm going to copy and paste this and the only thing I'm going to change is from min spawn distance. 16:42.910 --> 16:48.460 We're changing to max spawn distance, so we'll see a sphere at the min spawn distance. 16:48.460 --> 16:54.820 This will allow us to know how far away or how close the demons will be once we start spawning them. 16:54.820 --> 16:56.440 Or the minions, I should say. 16:56.680 --> 17:02.440 Now we're going to do this at the right of spread vector, but we're going to spawn two spheres along 17:02.440 --> 17:05.470 the line of the left of spread vector as well. 17:05.470 --> 17:10.660 So I'm going to copy those two lines, paste them here and change right of spread to left of spread. 17:10.660 --> 17:13.060 And now we're going to see what this looks like. 17:13.060 --> 17:18.580 So I'm going to go ahead and close the editor and run in debug mode again. 17:19.770 --> 17:22.610 Okay, I'll go ahead and open up our ability. 17:22.620 --> 17:26.990 But really I just want to press play and see those debug spheres. 17:27.000 --> 17:31.800 Now, as I suspected, the min spawn distance is a little close. 17:31.800 --> 17:38.400 I don't want to spawn any minions that close so we can go back to summon ability and change min spawn 17:38.400 --> 17:39.270 distance. 17:39.270 --> 17:42.320 I think 150 is actually probably good. 17:42.330 --> 17:44.610 Let's see what 150 looks like. 17:44.850 --> 17:46.710 That's probably better. 17:46.710 --> 17:54.630 And I could probably even push that max spawn distance out a little more to say maybe even 400. 17:54.810 --> 18:02.700 And that way we'll have a nice area here and we'll spawn enemies within that area. 18:02.910 --> 18:07.470 Now we want a spread, I want an even spread. 18:07.500 --> 18:16.140 So I want to spawn an enemy somewhere along the lines of that left vector and somewhere along the lines 18:16.140 --> 18:17.700 of that right vector. 18:17.700 --> 18:22.390 And I'd like to spawn some enemies all in between. 18:22.390 --> 18:29.890 So I kind of want to take this spread and divide it by my number of minions that I want to spawn, and 18:29.890 --> 18:37.270 that should give me the number of vectors along which my minions can be spawned. 18:37.540 --> 18:41.590 So what I'm going to do is I'm going to close the editor. 18:42.550 --> 18:47.920 And I'd like to take my spread and divide it by the number of minions I want to spawn. 18:48.130 --> 18:53.590 This will give me the number of vectors that I need to calculate. 18:53.860 --> 18:55.910 So I'm going to have a float. 18:55.930 --> 19:01.780 It'll be a const float and this will be called Delta Spread, which is going to be my spawn spread, 19:01.780 --> 19:09.310 which by default is 90 degrees divided by my num minions, which by default is five. 19:09.340 --> 19:11.770 So 90 degrees divided by five. 19:11.800 --> 19:19.570 This will be the angle between each of the vectors that I want to spawn minions along. 19:19.600 --> 19:29.590 Now, because I have a num minions, I'm going to want to do a for loop here and draw debug arrows in 19:29.590 --> 19:37.630 a spread spreading out like a fan and I want to start at right of spread and continue rotating by delta. 19:37.630 --> 19:42.710 Spread each iteration of the for loop and just draw some debug arrows. 19:43.250 --> 19:44.480 So here's what I'm going to do. 19:44.480 --> 19:54.170 I'm going to make a regular for loop with an int 32 called I set it equal to zero and as long as I is 19:54.170 --> 19:56.900 less than num minions I want to continue. 19:57.290 --> 20:00.470 Didn't mean to autocomplete that so it's going to be. 20:01.330 --> 20:06.150 Num minions and we're going to use I plus plus. 20:07.120 --> 20:12.940 So at first I is zero and I want to draw that right of spread vector. 20:13.030 --> 20:18.850 This is going to be sort of my beginning vector, my starting vector. 20:18.850 --> 20:21.880 So I'm going to move it just up above the for loop. 20:23.010 --> 20:25.950 And I'm going to calculate a direction vector. 20:25.950 --> 20:28.800 So const F vector. 20:30.410 --> 20:34.520 Call direction and it's going to be right of spread. 20:37.900 --> 20:40.540 But I'm going to take right of spread and rotate it. 20:40.540 --> 20:48.070 So I'm going to use rotate angle axis and I'm going to rotate it by delta spread times I. 20:48.100 --> 20:53.710 So the first time I will be zero, the first iteration of the loop and it will be just right of spread. 20:53.710 --> 20:54.940 We won't rotate at all. 20:54.970 --> 20:59.620 But the second iteration of the loop, we're going to rotate by delta spread and so on. 20:59.740 --> 21:08.020 And we're going to rotate about the up vector, so F vector up vector, and then we can simply draw 21:08.020 --> 21:09.460 that debug arrow. 21:09.460 --> 21:12.970 So I'm going to copy that line, paste it here. 21:13.000 --> 21:22.570 Only the debug arrow is going to start at location and end at location plus direction times max spawn 21:22.570 --> 21:23.490 distance. 21:23.500 --> 21:30.910 So now we'll be doing five lines because num minions is five and now I don't need those other draw debug 21:30.910 --> 21:39.290 arrow function calls, so I'm going to comment those out and I can simply run this and see what these 21:39.290 --> 21:40.490 vectors look like. 21:40.490 --> 21:42.170 So I'm going to go ahead and hit debug. 21:42.910 --> 21:45.280 So they should all be green arrows. 21:45.460 --> 21:50.320 But now we can make sure that we're getting an even spread of these vectors. 21:50.470 --> 21:53.200 So I can go ahead and hit play. 21:53.200 --> 21:58.030 I don't really need to keep hitting the open button kind of a habit at this point, but I'm going to 21:58.030 --> 22:02.890 press play and see and it looks like we've rotated the wrong way. 22:02.890 --> 22:11.290 So that's why these debug arrows and shapes are so important because then we can really get to know 22:11.290 --> 22:14.830 the geometry and make sure that we're not doing it wrong. 22:14.860 --> 22:22.960 So we could either start spreading or rotating the other way or we can start with left of spread. 22:23.230 --> 22:29.970 If we start with left of spread, then really all we need to do is replace the name with left of spread. 22:29.980 --> 22:35.710 Arguably don't even need that step, but we need spawn spread here to be negative. 22:35.710 --> 22:43.640 So we're rotating the other way and then direction will be left of spread, rotated by the same direction. 22:43.640 --> 22:46.280 So we're actually rotating in the same direction. 22:46.280 --> 22:52.250 We're just starting from a different orientation and now we don't need this left of spread. 22:52.250 --> 22:53.690 So I'm going to comment it out. 22:53.840 --> 22:54.320 Now. 22:54.320 --> 23:00.740 What I'd like to do actually is take our two calls to draw debug sphere, cut them out and paste them 23:00.740 --> 23:06.380 inside the for loop and replace right of spread with direction. 23:06.590 --> 23:11.150 That way we'll get these spheres drawn and I'm going to make them even smaller. 23:11.150 --> 23:17.000 I'm going to give them a radius of ten and then I can go ahead and comment out all the rest of these 23:17.000 --> 23:17.690 lines. 23:17.690 --> 23:21.670 So now we should see spheres all along each of our lines. 23:21.680 --> 23:23.150 Let's give this a try. 23:24.450 --> 23:24.750 Okay. 23:24.750 --> 23:25.950 I'm going to press play. 23:26.940 --> 23:33.060 And now we see something a little bit more along the lines of what we expected. 23:33.270 --> 23:36.960 So here's what this spread means, at least for me. 23:36.960 --> 23:44.250 This is what I have in mind, is I want to spawn five minions and each of them will be spawned somewhere 23:44.250 --> 23:50.070 along one of these lines between the min spawn distance and the max spawn distance. 23:50.070 --> 23:58.020 So we're going to pick a random location along each of these lines, and I'm going to add those to an 23:58.020 --> 24:01.170 array that our function is going to return. 24:01.290 --> 24:10.440 So what I'm going to do is I'm going to go ahead and pick a random location along the line in the for 24:10.440 --> 24:10.980 loop. 24:11.220 --> 24:16.440 So I'm going to create a const f vector called location. 24:16.440 --> 24:23.850 Actually, I'm going to call this chosen spawn location and it's going to be equal to location. 24:23.850 --> 24:28.410 That's the shaman's location plus direction. 24:28.590 --> 24:33.450 And we're going to multiply direction by a random number in range. 24:33.450 --> 24:42.210 We're going to use F math rand range and we'll use F rand range for the float version and the min is 24:42.210 --> 24:44.520 going to be min spawn distance. 24:44.550 --> 24:52.200 The max will be max spawn distance and that way we'll get some random value between Min and Max that 24:52.200 --> 24:56.250 will be scaling that direction vector by and adding to location. 24:56.250 --> 25:03.150 So this will be our chosen location and we're going to draw a debug sphere to show that spawn location. 25:03.150 --> 25:09.390 So what I'm going to do is right after chosen spawn location, we'll draw the debug sphere and we're 25:09.390 --> 25:12.900 going to draw it at our chosen spawn location here. 25:12.990 --> 25:14.550 I'm going to make it a little bigger. 25:14.550 --> 25:18.240 Let's make it about 18 in duration. 25:18.240 --> 25:20.430 We'll give it a different color. 25:20.520 --> 25:24.480 I'm going to choose Cyan and our other spheres. 25:24.480 --> 25:26.310 I'm going to draw them even smaller. 25:26.310 --> 25:28.900 We're going to draw them at five now. 25:29.260 --> 25:37.300 So now we should be able to visualize our spawn locations and at this point we can actually start returning 25:37.300 --> 25:40.660 something because now we have chosen spawn locations. 25:40.660 --> 25:49.690 We can create a local array just outside the for loop t array of F vectors called spawn locations. 25:50.170 --> 25:54.970 And each time we choose a spawn location, we can add that to spawn locations. 25:54.970 --> 25:57.370 So we can say spawn locations, dot add. 25:58.010 --> 26:05.420 And we can add chosen spawn location and at the end of the function we can return spawn locations. 26:05.420 --> 26:10.430 So really all this stuff that I've commented out is now no longer necessary. 26:10.460 --> 26:17.750 I can remove it and we now have a whole bunch of debug stuff that I'm just going to keep all together 26:17.750 --> 26:18.830 right here. 26:19.460 --> 26:24.780 And let's go ahead and see what those spawn locations end up looking like. 26:24.800 --> 26:26.780 So I'm going to hit the debug button. 26:28.440 --> 26:30.180 And we're just going to hit play. 26:30.770 --> 26:32.240 And there we go. 26:32.240 --> 26:36.860 We have random spawn locations all about that spread. 26:36.950 --> 26:38.720 Pretty cool, right? 26:39.600 --> 26:45.600 So this is nice because now we can kind of see the locations that would be chosen by this algorithm. 26:45.600 --> 26:48.510 That one was a bit of a wider out spread. 26:48.540 --> 26:50.460 This one was a little more random. 26:50.460 --> 26:51.600 So pretty cool, right? 26:51.600 --> 26:59.100 I think this is a nice little algorithm to get, you know, five different locations, but we parameterized 26:59.100 --> 26:59.280 it. 26:59.280 --> 27:00.990 It doesn't have to be five. 27:01.020 --> 27:04.650 We can go back into our gameplay ability. 27:04.650 --> 27:11.910 Let's go into enemy abilities and gain some inability and we could easily change these parameters. 27:11.910 --> 27:14.760 We could change the number of minions to eight. 27:14.820 --> 27:19.500 We can change the spawn spread to 120 and if we do that. 27:20.470 --> 27:27.100 Now we can see that there's an even wider spread with more minions, more enemies to spawn, or at least 27:27.100 --> 27:30.250 more locations to potentially spawn enemies at. 27:30.280 --> 27:30.940 Right. 27:30.940 --> 27:36.880 And that's kind of cool because you could make some kind of formula related to the abilities level, 27:36.880 --> 27:41.590 for example, and then you could spawn more or less enemies based on that. 27:41.620 --> 27:43.570 The possibilities are endless. 27:43.600 --> 27:49.930 I'm going to set the spread back to 90 and the number of minions back to five, and we now have a nice 27:49.930 --> 27:53.440 little algorithm to choose spawn locations. 27:53.440 --> 27:57.750 And that's the first step to spawning enemies with our new spawn ability. 27:57.760 --> 28:00.730 So great job sticking through this video. 28:00.730 --> 28:08.200 It was a little longer, but we did need to devise a little bit of a more complex algorithm. 28:08.200 --> 28:11.040 Not really complex, but more involved, right? 28:11.110 --> 28:12.670 Actually kind of small. 28:12.670 --> 28:15.670 When you remove all the debug stuff, it's not too bad. 28:15.670 --> 28:20.180 But now we have a set of spawn locations and we can use those. 28:20.180 --> 28:22.400 So great job and I'll see you soon.