WEBVTT 00:06.930 --> 00:07.950 Welcome back. 00:07.950 --> 00:14.010 Now in this video, we're concerned with making a new interface, one that any actor can implement if 00:14.010 --> 00:17.190 we'd like to be able to highlight it when hovering over it. 00:17.610 --> 00:25.500 So for that, let's go to our C plus plus classes, Aura Public, and we'll go into interaction where 00:25.500 --> 00:26.970 we have our interfaces. 00:26.970 --> 00:29.010 We'll make a new interface here. 00:29.010 --> 00:32.880 So we'll scroll down to the bottom, make an unreal interface. 00:32.880 --> 00:36.450 And this can be our highlight interface. 00:37.620 --> 00:39.690 So we'll call it highlight interface. 00:40.020 --> 00:41.190 Create the class. 00:42.400 --> 00:43.900 And close the editor. 00:45.040 --> 00:49.720 Now the highlight interface is just going to have a couple of functions on it. 00:50.200 --> 00:51.850 So let's take a look at it. 00:51.850 --> 00:58.030 Here's highlight interface I'm going to open the header file though I almost accidentally moved something 00:58.030 --> 01:01.840 into another folder unintentionally but I canceled that. 01:01.840 --> 01:03.910 Here's highlight interface dot h. 01:03.910 --> 01:10.570 And let's get Combat Interface open as well so we can see what we've got in combat interface for highlighting 01:10.570 --> 01:11.710 and UN highlighting. 01:12.280 --> 01:14.290 Actually it's not in combat interface is it. 01:14.290 --> 01:15.790 It's an enemy interface. 01:15.790 --> 01:16.600 That's right. 01:16.600 --> 01:19.660 Enemy interface is actually kind of simple. 01:19.930 --> 01:26.650 It has highlight and unhighlight actor, but it also has set combat target and get combat target. 01:26.650 --> 01:28.390 So quite simple. 01:28.420 --> 01:31.360 Our highlight interface is going to be simple as well. 01:31.960 --> 01:36.910 Now as soon as we move these two functions into highlight interface, we're going to break something 01:36.910 --> 01:38.230 in the player controller. 01:38.230 --> 01:43.750 As the player controller is checking for the enemy interface when performing its cursor trace. 01:44.020 --> 01:45.910 So we are going to need to fix that. 01:46.360 --> 01:51.040 So what we can do is we can move these two functions with control X. 01:51.850 --> 01:55.210 Into highlight interface right here in the public section. 01:56.340 --> 01:59.310 And now we have to do a couple things. 01:59.310 --> 02:02.520 First of all, we need to go into the controller class. 02:02.520 --> 02:09.840 I went ahead and close aura dot h and let's go into the private folder, into player, into Aura player 02:09.840 --> 02:16.140 controller, where we're now going to see some red due to the interface that we're casting to in Cursor 02:16.140 --> 02:16.800 Trace. 02:17.430 --> 02:21.420 So what we're going to do is change what we're casting to here. 02:21.420 --> 02:25.320 From I enemy interface to I highlight interface. 02:25.320 --> 02:27.900 We can do that here I highlight. 02:29.490 --> 02:30.510 Interface. 02:31.170 --> 02:33.870 That's going to auto include that header file. 02:34.110 --> 02:38.010 But this actor and last actor are not highlight interface pointers. 02:38.010 --> 02:40.200 They're I enemy interface pointers. 02:40.200 --> 02:45.120 So we're going to need to change that to here in our player controller dot h. 02:45.120 --> 02:52.980 We're going to want to change last actor in this actor to I highlight interfaces. 02:54.810 --> 02:59.640 Now we're going to have a forward declaration here for I highlight interface. 03:00.360 --> 03:01.380 Like so. 03:01.620 --> 03:07.980 And if we search for AI enemy interface, we'll see that we don't actually need that forward declared 03:07.980 --> 03:09.720 here, so we can remove that. 03:10.020 --> 03:14.610 Now back in the cpp file, our last actor and this actor are. 03:14.610 --> 03:20.610 Now I highlight interfaces and we're calling highlight and Unhighlight on those actors. 03:21.000 --> 03:27.210 But the thing is they'll always be null because our enemies don't implement the highlight interface 03:27.210 --> 03:27.930 at all. 03:28.290 --> 03:31.410 What they implement is the enemy interface. 03:31.680 --> 03:35.820 So we have to implement the highlight interface in our enemies now. 03:36.060 --> 03:40.050 So what we can do is we can go to the character folder. 03:40.050 --> 03:42.240 I'd like to go to the public folder. 03:43.550 --> 03:45.320 And open Ora enemy. 03:46.610 --> 03:49.400 Where we have highlight and Unhighlight actor. 03:49.820 --> 03:52.220 Now I don't want to remove the enemy interface. 03:52.220 --> 03:53.870 Enemies need to implement that. 03:53.870 --> 03:58.610 I just want to add an additional interface we're going to implement. 03:58.610 --> 04:05.060 I highlight interface now, and that does require the header file for the highlight interface included. 04:05.420 --> 04:11.120 And now these functions are overriding the highlight interface virtual functions. 04:11.120 --> 04:15.800 So we can change this comment to say highlight interface instead. 04:17.920 --> 04:21.730 Now with that, we should still get the same exact behavior. 04:22.210 --> 04:27.760 We can hit debug and just test things out to make sure that everything works the same way. 04:30.600 --> 04:32.130 Okay, so we're back. 04:32.130 --> 04:40.650 I think I'm done with my post process highlight material now this enemy still starts off highlighted 04:40.650 --> 04:47.640 as ten, and that's because I set its custom depth stencil value in its details panel. 04:47.640 --> 04:52.170 If we want to get rid of that, we're going to need to change that back. 04:54.910 --> 05:00.580 So what I can do is set this value to zero and uncheck Render Custom Depth pass. 05:01.260 --> 05:02.790 That's going to fix that. 05:02.790 --> 05:08.850 And now if I press play, it's not highlighted, but it's still highlights because it implements the 05:08.850 --> 05:09.660 highlight interface. 05:09.660 --> 05:10.170 Now. 05:10.800 --> 05:15.630 Now this is great because now we don't have to just have enemies be highlighted. 05:15.630 --> 05:18.930 We can have anything else implement the highlight interface. 05:18.930 --> 05:23.910 As long as they implement highlight and unhighlight we should be able to highlight them. 05:24.660 --> 05:30.900 The problem is though, if we hover over a highlight interface and we click, as long as we have abilities 05:30.900 --> 05:33.540 which loading in without loading from disk. 05:33.540 --> 05:41.610 Now I don't get those abilities, but if I did, I would cast that spell assigned to my left mouse button 05:41.610 --> 05:44.430 when highlighting over a highlight interface. 05:44.520 --> 05:46.740 That's because our code is all the same. 05:46.740 --> 05:49.440 We get the same behavior in the player controller. 05:49.440 --> 05:56.370 When we left click, we have ability input tag pressed and released which check whether or not we're 05:56.370 --> 05:57.300 highlighting. 05:57.300 --> 06:05.160 We have a boolean called targeting, which is set to true if this actor is valid, false if not, and 06:05.160 --> 06:10.470 that actor is null or not based on casting to the highlight interface. 06:10.770 --> 06:17.130 So if we want to be able to highlight something without this property of left clicking and casting a 06:17.130 --> 06:24.480 spell targeting it, well, we're going to need to make a couple changes to the player controller and 06:24.480 --> 06:30.330 have the ability of knowing that whatever we're highlighting is an enemy or not an enemy. 06:30.750 --> 06:33.540 So we're going to focus on doing that next. 06:33.540 --> 06:38.820 We'll have some changes to make to the player controller so that we can highlight a non enemy. 06:38.820 --> 06:44.700 And if we click on it, we don't get the behavior of casting a spell targeting it. 06:44.700 --> 06:46.140 So we'll do that next. 06:46.560 --> 06:47.460 I'll see you soon.