WEBVTT 00:06.830 --> 00:07.790 Welcome back. 00:07.820 --> 00:15.200 In this video, we'd like to make an actor for our flame pillar, and I'd like it to have some more 00:15.200 --> 00:20.090 dynamic lighting that kind of fades in and gets brighter and darker. 00:20.090 --> 00:22.970 So it looks like the flame is dynamically emitting light. 00:23.000 --> 00:29.150 Now, one thing that's kind of bugging me is this little spot here where we can run around. 00:29.150 --> 00:33.890 I don't really want to be able to run back there, so I'm going to move these over a bit. 00:33.890 --> 00:39.050 I'm actually going to undo that and turn snapping on first and move those over. 00:39.860 --> 00:46.910 Now I have a gap, so I'm going to move these over and I think I can just delete this part and duplicate 00:46.910 --> 00:49.490 this one like so. 00:49.610 --> 00:53.540 Now I have a bit of a wider opening, which might be okay. 00:53.540 --> 00:58.430 Or I can delete that and just duplicate this one and bring it down. 00:58.430 --> 01:01.090 Actually a three by three might be better. 01:01.100 --> 01:03.710 So we don't have that little spot down there. 01:03.740 --> 01:04.700 Okay, cool. 01:04.970 --> 01:06.320 That was just bugging me. 01:06.320 --> 01:14.330 So now we have a blocked part so that way we can deal with the complication of having that ceiling in 01:14.330 --> 01:16.550 the way and we'll get to that. 01:16.550 --> 01:20.930 But for now, we're making a flame pillar, so let's do that. 01:20.930 --> 01:25.970 And I see absolutely no reason to make this a C plus plus actor. 01:26.000 --> 01:33.290 This is a purely cosmetic designer type thing to make, so we're going to make it in the editor with 01:33.290 --> 01:34.100 Blueprint. 01:34.100 --> 01:37.880 So I'm going to remove that texture filter. 01:37.880 --> 01:45.600 I don't need to search for stair anymore and I'm going to go ahead and go to Blueprints Actor and make 01:45.600 --> 01:48.630 a new folder called Flame Pillar. 01:49.020 --> 01:51.390 We'll make a new blueprint here. 01:51.480 --> 01:58.440 I'm going to right click Create Blueprint class, choose actor and this will be BP Underscore Flame 01:58.440 --> 01:59.190 Pillar. 02:01.130 --> 02:03.980 So the flame pillar is going to be pretty simple. 02:04.130 --> 02:06.080 For one, it needs a mesh. 02:06.080 --> 02:13.250 So we're going to select the default scene route, add a static mesh and call this the pillar. 02:13.640 --> 02:18.080 Well, pillar, not the pillar, and I'm going to drag it on to the default scene route. 02:18.080 --> 02:19.430 So it's the route. 02:19.460 --> 02:26.720 Now with Pillar selected, I'm going to set this to the static mesh pillar in this project. 02:26.720 --> 02:32.930 So now we have an actor with Pillar and we can add our own flame to it. 02:32.930 --> 02:40.220 So selecting Pillar, I'm going to click Add Type Niagara and use a Niagara particle system. 02:40.220 --> 02:48.650 I'm going to call it flame and set the system to fire and bring it on up so that it's right there. 02:48.650 --> 02:52.820 I'm going to disable snapping and bring it down like so. 02:52.820 --> 02:57.320 Now I'd like a point light and I'd like the point light attached to the flame. 02:57.320 --> 03:00.810 So with the flame selected, I'm going to search for point light. 03:00.810 --> 03:09.660 Select that and we're going to call this fire light and I'm going to bring that up right up to the flame 03:09.660 --> 03:10.530 itself. 03:10.560 --> 03:14.010 And I think this could be a little bit more orange. 03:14.010 --> 03:18.210 So I'm going to bring it over into the yellow, almost orange color. 03:19.080 --> 03:20.310 Like so. 03:22.160 --> 03:23.230 That looks good. 03:23.870 --> 03:25.240 Let's get one of these in. 03:25.250 --> 03:26.870 Let's get a couple of them, actually. 03:26.870 --> 03:29.060 So I don't really want this one anymore. 03:29.060 --> 03:36.530 With its separate Niagara system, I'm going to remove both of those and turn snapping back on and grab 03:36.530 --> 03:41.420 myself a flame pillar and bring it in and duplicate it over to this side. 03:41.720 --> 03:44.600 So I have a couple of them now. 03:44.600 --> 03:46.610 That light is a little bit bright. 03:46.610 --> 03:48.470 I'd like it to be a little softer. 03:51.840 --> 03:54.030 It doesn't have to have such a high intensity. 03:54.030 --> 03:58.530 But what I really like to do, though, is make its intensity dynamic. 03:58.740 --> 04:01.480 So I'm going to use a timeline for that. 04:01.500 --> 04:09.240 So my fire light, if it's going to be dynamically changing its intensity, it has to be either stationary 04:09.240 --> 04:10.070 or movable. 04:10.080 --> 04:11.520 It can't be static. 04:11.550 --> 04:17.970 Now, movable means that we can change its intensity and its color dynamically, but we could also move 04:17.970 --> 04:20.550 it throughout the level during the game. 04:20.550 --> 04:22.170 That's not what we need for this. 04:22.170 --> 04:28.470 So saving a little bit on performance, we can change it to stationary so we can be stationary and still 04:28.470 --> 04:31.500 dynamically change the intensity of the light. 04:31.500 --> 04:33.000 And that's what we're going to do. 04:33.360 --> 04:35.890 Now we don't have to actually tick. 04:35.910 --> 04:40.740 I'm going to search for tick with flame pillar, self selected and uncheck. 04:40.740 --> 04:42.500 Start with tick enabled. 04:42.510 --> 04:43.800 We don't need to tick. 04:43.830 --> 04:45.960 We're going to use a timeline instead. 04:45.960 --> 04:52.900 So I'm going to right click in the event graph type timeline and add a timeline and we can call this 04:52.900 --> 04:56.560 flame intensity timeline. 04:57.310 --> 04:59.270 And we're going to add a curve to it. 04:59.290 --> 05:00.220 We'll add a track. 05:00.250 --> 05:03.570 This track is going to be a float track. 05:03.580 --> 05:07.510 And I'm going to call this track Flame Intensity. 05:07.540 --> 05:10.450 Really, it's point light intensity, but whatever. 05:10.630 --> 05:13.000 And we can start adding some keys to this. 05:13.000 --> 05:15.880 So I'm going to add two, three, four keys. 05:17.920 --> 05:24.970 We have a length of five seconds here, so I'm going to set that to more like two seconds and just have 05:24.970 --> 05:27.820 a few keys and move them up and down. 05:27.820 --> 05:30.940 And this will be for our flame intensity. 05:30.970 --> 05:33.850 Now, there's no need to go below zero. 05:33.880 --> 05:40.150 A zero intensity means the flame is basically out, but we're going to just have something like this. 05:43.130 --> 05:45.920 I'll add one more key and go back down. 05:48.010 --> 05:49.570 Like so. 05:50.740 --> 05:53.470 And then of course, I can highlight all of them. 05:53.770 --> 05:57.220 Right click Select Auto and they're nice and smooth. 05:57.250 --> 06:04.720 So now I have a timeline that once we run it, it'll return this flame intensity and it goes from zero 06:04.720 --> 06:08.380 to just above one, probably close to two. 06:08.470 --> 06:15.820 And what I'd like to do is set the intensity when we're running this timeline for my point light called 06:15.820 --> 06:16.480 fire light. 06:16.480 --> 06:23.530 So if I drag fire, light, drag it off and type set intensity, we can call set intensity passing in 06:23.530 --> 06:24.490 a value. 06:24.640 --> 06:26.530 Now what is its intensity Already? 06:26.530 --> 06:34.570 It's set to 5000, so I'd like a base intensity boolean, so I'm going to drag off of new intensity, 06:34.570 --> 06:44.080 promote to a variable and call this base intensity compile and set that to 5000 by default. 06:44.200 --> 06:47.950 And then I'm going to multiply by the flame intensity. 06:49.200 --> 06:51.780 As we're playing this timeline. 06:52.480 --> 06:55.210 That means we'll be fading in and out. 06:55.210 --> 06:58.450 The intensity will multiply 5000 by zero. 06:58.450 --> 07:00.010 So that's exactly zero. 07:00.010 --> 07:04.000 And then going all the way up to one, we're scaling it by that 5000. 07:04.000 --> 07:09.310 So the intensity will go up to 5000, then down, then up, then down, then up. 07:09.310 --> 07:13.950 And so we'll see a sort of flickering looking behavior. 07:13.960 --> 07:16.570 So that's going to be tied to update. 07:16.570 --> 07:19.180 So we'll figure out how to loop it in a second. 07:19.180 --> 07:26.710 For now, let's just drag Beginplay up to play from start and see what this looks like in the game. 07:27.900 --> 07:29.340 So pressing play. 07:29.340 --> 07:31.080 We see that it's flickering. 07:31.260 --> 07:32.670 Now, a couple issues. 07:32.670 --> 07:33.750 For one, it stops. 07:33.750 --> 07:35.430 We're going to want it to keep playing. 07:35.430 --> 07:38.160 And another issue is when we press play. 07:38.190 --> 07:43.580 They're both flickering in sync with each other, so that doesn't look very nice either. 07:43.590 --> 07:48.720 So to handle both of those problems, I'm going to delete those nodes I'm not using here. 07:49.140 --> 07:55.560 I'm going to make another timeline and this timeline is going to have a different length. 07:55.560 --> 08:01.320 So rather than just adding a new track to this timeline, I'm just going to make a second timeline. 08:02.190 --> 08:04.170 This first one is called flame intensity. 08:04.200 --> 08:04.920 Timeline. 08:04.920 --> 08:12.870 I'm going to rename it to Flame intensity, Underscore one, and then I'll make another timeline. 08:14.760 --> 08:16.860 And this one will be called flame intensity. 08:16.890 --> 08:18.270 Underscore two. 08:18.300 --> 08:19.590 We'll double click this. 08:19.590 --> 08:23.720 This could be a completely different track with a different length. 08:23.730 --> 08:29.400 We'll set it to three seconds, we'll add a float track and we'll start adding some keys to this curve 08:29.400 --> 08:33.540 and we'll make this track quite a bit different than the other one. 08:40.160 --> 08:43.010 And we'll move things up and down. 08:47.110 --> 08:51.790 Like so and I'm going to highlight all of them, make them auto curves. 08:51.790 --> 08:56.200 And I have now this curve here, which looks a bit different. 08:56.200 --> 08:56.860 Right? 08:56.860 --> 09:03.940 I'm going to set these end points, exact this 1 to 3 seconds and a value of zero, this 1 to 0 seconds 09:03.940 --> 09:05.230 and a value of zero. 09:06.020 --> 09:07.580 Just because I can. 09:07.580 --> 09:11.300 And now I have my second timeline. 09:11.630 --> 09:17.030 So now what I can do is I'm going to make a custom event to play each timeline. 09:17.030 --> 09:20.180 So I'm going to right click here type custom event. 09:20.210 --> 09:23.030 I'm going to call this start time. 09:23.030 --> 09:26.120 You can't see because that hover tooltip was in the way. 09:26.150 --> 09:32.450 Start timeline underscore one and I'm going to make another custom event. 09:35.110 --> 09:38.440 Start timeline underscore two. 09:39.770 --> 09:40.670 Start timeline. 09:40.670 --> 09:42.720 One will play this one from the start. 09:42.740 --> 09:45.770 Start timeline two will play the other one from the start. 09:45.890 --> 09:50.120 I'd like to make sure that both of them have used last keyframe checked. 09:50.770 --> 09:52.750 So I'm going to check that for both of them. 09:52.930 --> 09:55.900 And I want to do the same thing. 09:55.900 --> 10:00.160 Multiply base intensity by this flame intensity. 10:00.490 --> 10:06.850 By the way, this one isn't called flame intensity, so I'm just going to rename it to flame intensity 10:07.060 --> 10:13.990 for the track and I can just make a function that can do this and call it twice. 10:13.990 --> 10:20.440 So I'm going to right click collapse the function and call this scale flame intensity. 10:21.630 --> 10:27.810 And we'll call this down here for update, just like we did for the first track. 10:29.370 --> 10:29.760 Like. 10:29.760 --> 10:33.950 So now this input, I'm being a little quick. 10:33.960 --> 10:36.900 We could call this intensity instead of just a. 10:38.450 --> 10:41.780 And if we compile that now, we see intensity there. 10:43.090 --> 10:45.010 Okay, so we have two events. 10:45.040 --> 10:48.530 What I'd like to do is play one at random and begin play. 10:48.550 --> 10:55.210 So I'm going to make yet another custom event and this will be Choose Timeline. 10:55.210 --> 10:59.980 And we can just get a random integer between 0 and 1. 11:00.400 --> 11:04.870 So I'm going to say random int and get random integer and range. 11:04.870 --> 11:10.720 We'll get a random int between 0 and 1, basically a coin flip and then we can switch on that. 11:10.720 --> 11:12.820 INT So I'm going to use switch on int. 11:14.940 --> 11:17.580 And if it's a zero, we'll play the first timeline. 11:17.580 --> 11:20.140 And if it's a one, we'll play the second timeline. 11:20.160 --> 11:22.110 So I'm going to add a pen twice. 11:22.110 --> 11:24.780 So we have a zero and one off of zero. 11:24.810 --> 11:28.230 I'm going to call start Timeline one. 11:29.220 --> 11:32.220 Off of one I'm going to call start time line to. 11:34.390 --> 11:37.480 And the default can just start timeline two. 11:37.870 --> 11:40.960 So now we have this Choose Timeline event. 11:40.990 --> 11:43.120 And I'm going to call that and begin play. 11:43.180 --> 11:53.200 So choose timeline like so now when we finish one of these timelines, we can simply call choose timeline 11:53.200 --> 11:54.820 and play one of these two at random. 11:54.820 --> 11:57.160 So we're going to do Choose Timeline. 11:58.730 --> 12:02.600 After we finished the first timeline and choose timeline. 12:02.720 --> 12:04.640 After we finish the second one. 12:04.850 --> 12:10.100 So each time a timeline finishes, we'll play another one of them at random. 12:10.100 --> 12:16.910 And then we shouldn't have such a rigid looking system where all of our torches are flickering at the 12:16.910 --> 12:17.730 same rate. 12:17.750 --> 12:20.360 So let's go ahead and save all. 12:21.030 --> 12:22.080 Press play. 12:22.870 --> 12:27.700 And now we can see that they're not flickering in sync anymore. 12:27.730 --> 12:29.290 They're flickering completely differently. 12:29.290 --> 12:34.600 It looks random, but really, we're just choosing one of those timelines at random and it looks pretty 12:34.600 --> 12:35.110 good. 12:38.850 --> 12:42.870 Let's make sure we can still launch a fireball at it and we can't. 12:42.870 --> 12:50.280 So we can take that pillar and just set its collision settings to the settings we need for our project. 12:50.310 --> 12:52.350 We're going to set it to custom. 12:52.950 --> 13:02.250 We're going to block the projectile and ignore visibility and camera, and that way we should be able 13:02.250 --> 13:05.130 to click on it and run behind it. 13:05.910 --> 13:09.540 And we should be able to hit it with the projectile. 13:10.980 --> 13:19.320 And with that we have a nice flickering torch or pillar, essentially a torch, and things are looking 13:19.320 --> 13:20.070 great. 13:20.490 --> 13:21.420 Excellent job. 13:21.420 --> 13:23.190 And I'll see you in the next video.