WEBVTT 00:06.840 --> 00:07.930 Welcome back. 00:07.950 --> 00:10.890 So we'd like to use the environment query system. 00:11.010 --> 00:18.150 I'd like to be able to run some kind of X query to do all those nice, wonderful things we talked about 00:18.150 --> 00:19.800 in the previous video. 00:19.830 --> 00:23.460 In order to do that, I need to make an environment query. 00:23.760 --> 00:25.560 So here's what I'm going to do. 00:25.560 --> 00:29.700 I'm going to go into Blueprints I and we'll make one here. 00:29.730 --> 00:35.640 Now, at this point, I think it's time for some sub folders as we're getting kind of a lot of things 00:35.640 --> 00:37.840 and they're all getting jumbled up here. 00:37.860 --> 00:43.020 So I'm going to right click and make a new folder and put my behavior tree in Blackboard in that. 00:43.020 --> 00:45.270 So I'm just going to call this behavior. 00:47.430 --> 00:52.900 Tree and the behavior tree and the blackboard can both be lumped in together. 00:52.920 --> 00:54.630 So I'm going to move those there. 00:54.720 --> 00:57.390 Now, we also have a couple of tasks. 00:57.390 --> 01:00.140 We have BT Attack and BT. 01:00.510 --> 01:01.980 Go around Target. 01:01.980 --> 01:09.200 So I'd like to make a new folder for tasks so we can call that tasks and I'll put my BT. 01:09.210 --> 01:10.110 S in there. 01:10.890 --> 01:11.880 Move here. 01:12.300 --> 01:16.890 Now, here's my controller and my behavior tree service. 01:16.920 --> 01:23.550 I'll go ahead and put my service in a folder called Services like So. 01:23.850 --> 01:33.000 Move here and my aura controller can either stay right there or I could put it in a new folder called 01:33.030 --> 01:34.320 I Controller. 01:34.950 --> 01:35.940 Either way is fine. 01:35.940 --> 01:38.070 I'll go ahead and put it in a controller. 01:38.190 --> 01:40.710 Now we have more organization. 01:40.740 --> 01:45.080 Now, I'd like to do this because I'm going to add even more things to this. 01:45.090 --> 01:50.030 I'm going to make a new folder for the ECS System Environment Query System. 01:50.040 --> 01:52.260 So here's an ECS folder. 01:52.260 --> 01:56.010 I'm going to go in that and we're going to make our first environment query. 01:56.160 --> 02:02.690 So to do that, I right click, I go to artificial intelligence and here we see environment query. 02:02.700 --> 02:09.990 If I select that, I have a new environment query and I'm going to call this EC underscore EC stands 02:09.990 --> 02:17.530 for environment Query, and we'll call this find ranged attack position. 02:18.670 --> 02:25.120 So this will be for finding a good position for our Rangers to post up and start attacking. 02:25.210 --> 02:32.600 Now when it comes to ECS, a lot of things are going on sort of under the hood that can be hard to visualize. 02:32.620 --> 02:41.110 For that reason, there exists a special type of pawn that we can use to test out our environment queries. 02:41.110 --> 02:47.890 We can test what they're doing by drawing a bunch of debug shapes for all of the items that we generate. 02:47.890 --> 02:50.850 So I'd like to make one of those test pawns. 02:50.860 --> 02:56.350 I'm going to go to Blueprint class and search for ECS testing pawn. 02:56.380 --> 03:04.570 If we choose that ECS testing pawn and select it, we now have a pawn specifically designed to test 03:04.570 --> 03:05.950 environment queries. 03:06.040 --> 03:10.840 I'm going to call this BP underscore X testing. 03:11.870 --> 03:12.420 --. 03:12.980 --> 03:15.680 So how are we going to use this testing --? 03:15.710 --> 03:21.530 Well, I'd like to make a new level just for testing out environment queries, just so we don't have 03:21.530 --> 03:27.260 all this stuff in the way we have these enemies and they're going to be running up to us and distracting 03:27.260 --> 03:27.770 us. 03:27.800 --> 03:32.510 I'd like just a new map to test out the environment query system. 03:32.510 --> 03:40.850 So I'm going to go to file new level, choose basic, create and file, save as or save current level 03:40.850 --> 03:41.470 as. 03:41.480 --> 03:49.340 We'll go to maps and I'm going to call this X underscore testing map and we'll save that and we can 03:49.340 --> 03:51.500 test out our environment query system. 03:51.500 --> 04:00.440 So what I'm going to do is take my new EQs testing pawn and I X here it is, EQs testing pawn. 04:00.440 --> 04:01.760 We're going to bring that in. 04:02.030 --> 04:09.080 And with that pawn, we can choose to have this pawn test out one of our environment queries. 04:09.080 --> 04:13.770 We have one called EQ, Find ranged attack position. 04:13.770 --> 04:21.030 We can assign that to this X testing pawn as X testing pawns have this query template that it's going 04:21.030 --> 04:21.600 to test. 04:21.600 --> 04:27.540 So we're going to select EQ, find range, attack position, and now whatever we put in our environment 04:27.540 --> 04:32.750 query, we'll be able to draw some debug shapes here and see exactly what's going on. 04:32.760 --> 04:40.440 Now just to see this, I'm going to open up my EQ, find ranged attack position and notice it has a 04:40.440 --> 04:42.150 query graph with a route. 04:42.150 --> 04:44.580 So here is our environment query. 04:44.580 --> 04:51.210 And just like we discussed in the previous slide environment, queries make use of generators which 04:51.210 --> 04:59.100 generate a bunch of items either actors or locations, and that we can use those locations in our environment 04:59.100 --> 05:01.800 query based on whatever rules we set up. 05:01.800 --> 05:08.970 So we're going to add a generator by clicking on this bottom part of the root node dragging off. 05:08.970 --> 05:12.720 And notice that we have a number of generators that we can choose from. 05:12.720 --> 05:18.090 Now, once you learn how to use one of them, you pretty much know how to use all of them. 05:18.090 --> 05:20.700 You just have to be kind of shown the ropes. 05:20.700 --> 05:26.370 So we're going to choose one of them and the one we're going to choose is path and grid path in grid. 05:26.370 --> 05:34.320 If we select that is a special type of generator that generates a grid of points around a career. 05:34.320 --> 05:36.260 Now, what do we mean by career? 05:36.270 --> 05:42.990 Well, in the case of our testing pawn, our testing pawn itself is the career right here in the details 05:42.990 --> 05:50.010 panel we have generate around and we see environment, query context, underscore career by default. 05:50.010 --> 05:54.450 That is usually the pawn that's running this environment query. 05:54.450 --> 05:59.460 So let's take a look at some of the properties on this generator. 05:59.490 --> 06:04.950 The properties I'm concerned with right now are the grid half size and the space between grid. 06:04.980 --> 06:09.150 Half size is half of the squares extent, kind of like a radius. 06:09.180 --> 06:15.630 It's set to a thousand and space between is set to 100, which means we're going to get a grid of points 06:15.630 --> 06:17.310 with this specified size. 06:17.310 --> 06:22.230 Half of it is 1000, and the space between each point will be 100. 06:22.320 --> 06:26.040 Now, if we go back to the testing map, we can see what this looks like. 06:26.040 --> 06:35.130 Here we have a square with half of its width is 1000, so it's 2000 across 2000 across the other way. 06:35.130 --> 06:43.170 And we have this grid of points and each of these points is 100 units away from the next one. 06:43.170 --> 06:47.640 So we can see that we have quite a lot of points now. 06:47.640 --> 06:51.390 We saw that we have parameters in our generator. 06:51.420 --> 06:55.620 We can change our grid half size, we can change the space between. 06:55.620 --> 07:02.850 And what I'd like to do is undock this generator so I can see the test map as I'm playing with these 07:02.850 --> 07:04.050 parameters here. 07:04.050 --> 07:08.430 And I'm going to change the space between I'm going to change it to 200. 07:08.470 --> 07:14.550 Now we see that there are 200 units between each of these points, we can change the grid half size. 07:14.550 --> 07:19.080 I can change it to 500 and now we have quite a bit less, Right. 07:19.080 --> 07:24.510 And the number of points here is definitely going to affect how much work is done. 07:24.510 --> 07:30.240 If we do something for each one of these points, I'll set it back to 100 there. 07:30.240 --> 07:37.530 And here we have a grid of 500 with a space between of 100 setting grid half size to 800. 07:37.680 --> 07:39.060 Now we have this many points. 07:39.060 --> 07:46.650 So as you can see, we can play with this quite a bit and customize it to the grid that we think is 07:46.650 --> 07:47.760 appropriate for us. 07:47.790 --> 07:50.460 Now that's for a pathing grid. 07:50.460 --> 07:57.180 I'm going to hold alt and click right here to break this arrow and move that path in grid node away 07:57.180 --> 07:59.340 and drag off of the root. 07:59.340 --> 08:03.960 And instead of a pathing grid, I'm going to choose Points Circle. 08:04.260 --> 08:09.330 So as you can see, if you know how to use one of these generators, you pretty much know how to use 08:09.330 --> 08:10.950 them all, as you would expect. 08:11.250 --> 08:15.900 We have a bunch of points all around in a circular shape. 08:15.900 --> 08:17.940 We can change the circle radius. 08:17.970 --> 08:23.550 We can change the space between each of these, which will of course affect how many points there are. 08:23.550 --> 08:31.440 And we also have this arc angle, which if we drag down and give it a value less than 360, we can have 08:31.440 --> 08:35.370 a circular arc that's not a full circle, interestingly. 08:35.400 --> 08:37.650 So what do we do with points like this? 08:37.650 --> 08:43.830 Well, we run tests on them and tests are going to take these points. 08:43.830 --> 08:51.900 And based on whatever the test is that we run, it's going to score the points or filter them out or 08:51.900 --> 08:57.480 both filter out, meaning take some of the points and saying you points are no good, we're not going 08:57.480 --> 08:58.440 to use you. 08:58.440 --> 09:04.440 And scoring meaning run some kind of test on each of the points and see which one is better. 09:04.440 --> 09:07.680 So in the next video, we're going to run some tests on our points. 09:07.770 --> 09:09.420 I no longer need the circle. 09:09.420 --> 09:13.300 That was just to show you another example of a generator. 09:13.300 --> 09:20.440 We're going to hook up our pathing grid, which just gives us this grid with a bunch of points on it. 09:20.440 --> 09:25.090 And in the next video, we'll discover how to start running tests. 09:25.090 --> 09:27.280 So we'll do that next. 09:27.370 --> 09:29.260 Great job and I'll see you soon.