1 00:00:04,500 --> 00:00:05,580 ‫Hello and welcome. 2 00:00:05,580 --> 00:00:13,440 ‫In this lecture, we are going to be adding a new component in C++ that we can add to our actors to 3 00:00:13,440 --> 00:00:17,940 ‫add in some functionality using some composition, essentially. 4 00:00:17,940 --> 00:00:19,980 ‫Let's dive in and see how this is done. 5 00:00:20,370 --> 00:00:28,560 ‫So I want to add a section of wall that disappears from view when we place an object on it. 6 00:00:28,560 --> 00:00:34,710 ‫So what I'm going to do here is I'm going to go to the content draw and I'm going to search for the 7 00:00:34,710 --> 00:00:38,370 ‫dungeon wall in here. 8 00:00:38,730 --> 00:00:44,250 ‫And I think I want this one with a nice cut out section where I can stick a statuette. 9 00:00:44,250 --> 00:00:53,610 ‫So I'm going to drag this into the scene and I'm going to rotate it by 180 degrees and try and position 10 00:00:53,610 --> 00:00:54,840 ‫it accurately. 11 00:00:54,870 --> 00:00:55,350 ‫There we go. 12 00:00:55,350 --> 00:00:58,590 ‫Brought it down to the floor level and it's looking okay. 13 00:00:58,770 --> 00:01:06,630 ‫Now, what I want to do with this actor is I want to be able to add a component onto it that gives it 14 00:01:06,630 --> 00:01:09,540 ‫the capability of moving itself. 15 00:01:09,840 --> 00:01:12,240 ‫Now, we've dealt with components before. 16 00:01:12,240 --> 00:01:17,220 ‫We've added ones already created by Unreal, but we've never made our own in C++. 17 00:01:17,220 --> 00:01:18,930 ‫So that's what we're going to do in this lecture. 18 00:01:18,930 --> 00:01:24,390 ‫So what we're going to do is go to this add button and you can see there is an option within here to 19 00:01:24,390 --> 00:01:27,780 ‫create a new C++ component. 20 00:01:28,050 --> 00:01:33,030 ‫Now within here there are a couple of options for different types of components that we can inherit 21 00:01:33,030 --> 00:01:33,330 ‫from. 22 00:01:33,330 --> 00:01:35,280 ‫So the different types of components we can build. 23 00:01:35,280 --> 00:01:41,100 ‫There is an actor component, which is a component that just sits on an actor, any actor. 24 00:01:41,280 --> 00:01:47,010 ‫And then there's a scene component, which is an actor component that also adds in a transform and the 25 00:01:47,010 --> 00:01:49,380 ‫ability to attach to other scene components. 26 00:01:49,380 --> 00:01:52,860 ‫We don't need this functionality, so we're just going to go for the active component. 27 00:01:52,860 --> 00:01:56,460 ‫For now, we will be using scene components later on in the section though. 28 00:01:56,460 --> 00:01:58,200 ‫So let's go ahead and hit next. 29 00:01:58,200 --> 00:02:05,250 ‫Now we've got to name our component and we're going to call it simply the mover and we'll go ahead and 30 00:02:05,250 --> 00:02:12,540 ‫hit create class and instantly it opens up in Visual Studio for me and Visual Studio code and I can 31 00:02:12,540 --> 00:02:17,490 ‫see that there is a mover H and a mover CP just like we had with our actors. 32 00:02:17,490 --> 00:02:22,770 ‫Interesting to note that the prefix to this class is you previously with the actor. 33 00:02:22,770 --> 00:02:28,380 ‫The prefix had been a and the other thing to note is the name of the tic function is different with 34 00:02:28,380 --> 00:02:28,980 ‫a component. 35 00:02:28,980 --> 00:02:34,530 ‫Its function is called tic component instead, but otherwise it is the same. 36 00:02:34,530 --> 00:02:41,040 ‫And if we go over to the C++ class, you can see that there is a tic component function in here. 37 00:02:41,040 --> 00:02:44,550 ‫So I'd like to challenge you to log a message on TIC. 38 00:02:44,550 --> 00:02:51,390 ‫So you're going to add a new log message, add a component to the to an actor, add your new component 39 00:02:51,390 --> 00:02:55,800 ‫to some actor and see if it prints the message that you have written. 40 00:02:55,800 --> 00:02:57,780 ‫Pause the video and have a go. 41 00:03:00,750 --> 00:03:01,230 ‫Okay. 42 00:03:01,230 --> 00:03:01,920 ‫We'll come back. 43 00:03:01,920 --> 00:03:03,220 ‫So let's give this a stab. 44 00:03:03,240 --> 00:03:09,540 ‫So in the tick component, we're going to type you log to get the U log macro to come up. 45 00:03:10,050 --> 00:03:17,880 ‫We're leaving it as a display setting and in here I'm going to type in mover is ticking exclamation 46 00:03:17,880 --> 00:03:18,870 ‫points of course. 47 00:03:18,870 --> 00:03:20,520 ‫Let's go back into unreal. 48 00:03:20,550 --> 00:03:27,570 ‫Actually what you can do is do a control alt f 11 from any place. 49 00:03:27,570 --> 00:03:31,470 ‫Actually, you can do it in Visual Studio code and it brings up the live coding window automatically. 50 00:03:31,470 --> 00:03:35,520 ‫When it's complete, it brings you back over to the editor, just saves you an alt tab. 51 00:03:35,670 --> 00:03:40,680 ‫So what we can do now is you can see this actor does not have our new component on it. 52 00:03:40,680 --> 00:03:46,050 ‫So let's go to the add button and we're going to search for mover. 53 00:03:46,050 --> 00:03:48,660 ‫And then you can see there is a custom component called mover. 54 00:03:48,660 --> 00:03:53,670 ‫If I go ahead and add it, you can see adds it to a separate section to the static mesh components and 55 00:03:53,670 --> 00:03:55,050 ‫the other components at the top. 56 00:03:55,350 --> 00:04:00,150 ‫That's because these components here, the ones that are attached to each other, are all the scene 57 00:04:00,150 --> 00:04:04,080 ‫components, the ones that have transforms that can be attached. 58 00:04:04,080 --> 00:04:09,660 ‫Whereas the normal actor components, the more simple act components, go in a separate section down 59 00:04:09,660 --> 00:04:10,590 ‫at the bottom, and they don't. 60 00:04:10,590 --> 00:04:13,050 ‫They just go in the list, they don't get attached to each other. 61 00:04:13,050 --> 00:04:17,130 ‫So we've got the mover down here and the moment it doesn't do very much. 62 00:04:17,130 --> 00:04:24,210 ‫Let's bring up our output log and docket to the layout and let's go ahead and hit play in the game. 63 00:04:24,210 --> 00:04:30,090 ‫And you can see that we are indeed getting mover is taking displayed in our output log. 64 00:04:30,120 --> 00:04:30,840 ‫Great stuff. 65 00:04:30,840 --> 00:04:34,050 ‫We have created our first actor component in C++. 66 00:04:34,050 --> 00:04:35,700 ‫I'll see you in the next lecture.