WEBVTT 00:00.300 --> 00:06.190 In this lesson, we're going to start to break up and shatter the ground to use in a simulation. 00:06.750 --> 00:10.830 So before you do that, I just wanted to follow it from the previous lesson where we brought in the 00:10.830 --> 00:11.610 Olympic cache. 00:12.060 --> 00:13.970 And so now we have kind of a duplicate. 00:13.980 --> 00:16.380 We have the Olympic and we still have the rig in our scene. 00:16.800 --> 00:18.090 So let's get rid of the rig. 00:18.090 --> 00:24.770 But the catch to that is because we've used the referenced rig, right. 00:24.780 --> 00:26.160 We have reference there. 00:26.160 --> 00:33.570 Again, we can go to file reference, Ed, and we can see that indeed, that's a reference rig. 00:33.580 --> 00:39.120 We can also tell by these little blue dots that's a reference to rig or a reference. 00:39.120 --> 00:40.890 You can reference models, you reference anything. 00:40.890 --> 00:41.840 But this is a reference rig. 00:42.540 --> 00:47.700 And if we were just to remove that now, it's going to take all of the shaders with it. 00:47.700 --> 00:51.780 So our Olympic cache will no longer have all the shares that we have applied to it. 00:52.200 --> 01:00.000 So the first thing we need to do is to import this so we can say file import objects from reference 01:00.480 --> 01:02.190 so it's no longer referenced. 01:02.670 --> 01:08.040 And we can see those little blue icons are gone and now we can delete this. 01:08.250 --> 01:12.210 And so when we delete it, it's not going to take the shaders with it. 01:12.210 --> 01:14.140 All the shaders down here are going to stay. 01:14.850 --> 01:21.120 So let's take a look at breaking up the ground when we've learned how to do this in the bullet physics. 01:21.210 --> 01:25.260 Kind of a couple of lessons at the beginning, but we're going to learn a new way. 01:25.260 --> 01:27.860 So I'm going to unreferenced this so I can actually select the ground. 01:28.560 --> 01:30.000 So we're going to learn differently. 01:30.180 --> 01:34.960 And this lesson is how to use particles to shatter this object. 01:35.350 --> 01:41.430 Now, we talked about this quickly and the previous lesson where let's take a, you know, a cube or 01:41.430 --> 01:42.510 something, for example. 01:42.510 --> 01:51.270 And if we drop it onto rotate this and let's just, you know, for argument's sake or for learning sake, 01:51.630 --> 01:57.960 let's say we drop this on its corner right here, smash right now, if we use the Chater tool and we 01:57.960 --> 02:05.580 can just pop that open, going to the effects and going to shatter like we've done previously, we're 02:05.580 --> 02:08.200 in this middle tap or solid shatter five pieces. 02:08.200 --> 02:09.880 Let's have no jaggedness, blah, blah. 02:09.910 --> 02:10.500 That's all fine. 02:12.060 --> 02:16.320 We don't need to delete the history, if you remember, need to go to edit delete by type history before 02:16.320 --> 02:17.040 we use this. 02:17.070 --> 02:20.370 So now when we apply, it should break this up into five different pieces. 02:21.510 --> 02:23.140 We still have the original Kamps. 02:23.140 --> 02:23.850 This was tie that. 02:24.390 --> 02:26.430 But so the point of this is just saying. 02:27.310 --> 02:34.240 You would expect if this tube fell from a certain height and it hit the ground like this right in this 02:34.240 --> 02:43.060 orientation, that this corner, at first you would expect it to shatter more at the point of impact 02:43.060 --> 02:44.690 and less as you go up. 02:45.220 --> 02:48.070 But with this tool, there's no control over that. 02:48.070 --> 02:48.380 Right. 02:48.400 --> 02:51.920 It just shatters it in like evenly sized pieces. 02:52.450 --> 02:56.230 I mean, it's kind of nice because they are, you know, at least pieces. 02:56.230 --> 03:02.410 But like, it doesn't respect the fact that we want a higher concentration of pieces down here in the 03:02.410 --> 03:03.160 U.S. at the top. 03:03.670 --> 03:07.300 So there is a special kind of work around that we can do. 03:07.760 --> 03:10.390 We can delete these and it doesn't involve this. 03:11.350 --> 03:16.060 Well, you know, let me take that back when you could do let's say that's the case. 03:16.060 --> 03:21.410 You could take this and keep applying this to it so we can chunk it down even more. 03:21.790 --> 03:25.960 But this tool is very finicky, to be honest. 03:25.960 --> 03:26.710 It's of terrible. 03:27.640 --> 03:31.930 So if I had a you can see that, you know, we get our air. 03:34.270 --> 03:39.010 And so, you know, it could be Free's transformation's. 03:39.010 --> 03:40.860 It could be a history thing like this. 03:40.870 --> 03:43.030 You know, you have to delete the history every time. 03:44.920 --> 03:46.780 But, yeah, you get you get errors. 03:46.780 --> 03:48.010 And it's just a super annoying. 03:49.150 --> 03:54.580 But in theory, you should be able to keep chunking this down and like, break this up and then break 03:54.580 --> 04:00.250 up, you know, another piece into a smaller five more pieces and that kind of a thing in theory. 04:00.250 --> 04:03.220 But it's just this tool is kind of terrible. 04:03.220 --> 04:07.990 And there's another there's there's another way and it's not super. 04:08.320 --> 04:11.770 It's not a built in way necessarily, but it's kind of a hack. 04:12.160 --> 04:19.450 But we also get it to introduce to another effects kind of system, and that is in particles. 04:19.450 --> 04:27.310 And you can see up here everything has been in in here and constraint in cash and they all share similar 04:27.310 --> 04:28.050 components. 04:28.090 --> 04:34.390 So like each one of these is going to have a nucleus and a nucleus holds, you know, important information 04:34.390 --> 04:39.630 for like what's gravity like, you know, what framed as a simulation start and stuff like that. 04:40.030 --> 04:46.690 So it has this in because they used to call this in dynamics and the tab instead of it saying FXE used 04:46.690 --> 04:47.740 to say in dynamics. 04:48.220 --> 04:51.160 So it's kind of a holdover and like the old name. 04:51.730 --> 05:00.100 But so basically what we're going to do is, is use particles to concentrate and use particles to say, 05:00.280 --> 05:03.730 you know, wherever these particles are, that should be a piece. 05:04.180 --> 05:10.270 And if we emit particles from the point that we want it to shatter from, there will be a higher concentration 05:10.270 --> 05:15.550 of shards and fractures at that kind of point where the particle emitter is. 05:16.120 --> 05:17.790 So let's just jump right into that. 05:17.800 --> 05:18.870 So that makes more sense. 05:18.880 --> 05:20.800 We'll go to and particles create a matter. 05:21.490 --> 05:25.990 And in the outliner, you can see we have that nucleus that I referred to. 05:25.990 --> 05:30.510 We have the actual emitter that's going to do the emitting and then we have the particles themselves. 05:31.060 --> 05:36.580 So for the nucleus, the one thing we need to look at is the star frame, because we are let's go back 05:36.580 --> 05:43.150 to frame 101 because we don't need pre role for this is just kind of using this as like a tool, almost 05:43.150 --> 05:44.080 like a modeling tool. 05:45.100 --> 05:47.470 But you can use it for all different kinds of things. 05:47.950 --> 05:52.840 But so let's turn to the time attributes around the nucleus. 05:52.850 --> 05:57.730 Let's go to time attributes and get the start frame to frame 1001. 05:57.760 --> 05:59.110 So this will actually play back. 06:00.220 --> 06:07.150 And if we select on the particles, we just hit play, let's have four. 06:07.150 --> 06:11.080 Actually, let's at least move the emitter where it's going to be useful. 06:11.080 --> 06:14.660 So the whole point of this is to do it where the guys punching through. 06:14.680 --> 06:16.660 So let's go to the framers hands punch through. 06:17.260 --> 06:21.580 We have the emitter selected so we can actually move the emitter, which is going to be this little 06:21.580 --> 06:26.410 dot and this and it stands for the nucleus and it can be anywhere in the scene. 06:26.410 --> 06:28.940 That position of itself doesn't actually really matter. 06:29.440 --> 06:36.070 So basically, I just want to position this thing kind of in the kind of thickness of this piece of 06:36.070 --> 06:40.360 ground right where the hand is punching through. 06:40.390 --> 06:44.980 So we're going to have a higher concentration of shards right there. 06:45.250 --> 06:45.640 Right. 06:46.330 --> 06:47.110 It kind of makes sense. 06:49.320 --> 06:55.110 So we have that place correctly and lets it play and see what we can see with these particles, but 06:55.230 --> 06:58.680 first we want to go back to the start frame, which is frame 1001. 06:58.680 --> 07:02.250 So I'll go back to frame 1001 and I'll hit play. 07:02.730 --> 07:09.000 And now we can see all these particles emitting and the thing want to be careful about this effect that 07:09.000 --> 07:15.450 we're going to be doing is the fact that each one of these particles is going to represent a new shard 07:15.450 --> 07:22.080 and this volume, a new fractured piece and the more particles you have. 07:23.060 --> 07:28.700 It gets very intensive, I just I just tested this and it took like maybe an hour and a half to do when 07:28.700 --> 07:34.370 I had like 300 particles in the sand, it took like an hour and a half to cut up this piece of geometry 07:34.370 --> 07:35.420 with these particles. 07:36.230 --> 07:39.170 So we want to reduce the amount of particles we're actually emitting. 07:39.170 --> 07:42.260 So let's go to the emitter and we can go to the rate. 07:42.590 --> 07:46.670 And we just want to take this way down maybe to like 10. 07:47.060 --> 07:51.130 And by default, your speed is probably at one. 07:51.140 --> 07:52.430 And I cranked mine up to ten. 07:52.430 --> 07:57.680 That's the other thing you might want to change because of the scale we're working at, one is going 07:57.680 --> 07:58.750 to be way too slow. 07:59.270 --> 08:01.640 So you want to make sure your speed is cranked up. 08:02.210 --> 08:08.870 And the other thing is by default, we we do have gravity working on it. 08:09.470 --> 08:14.450 So I'm going to try and escape and turn off gravity because we're just trying to get particles emitted 08:14.450 --> 08:14.630 in here. 08:14.630 --> 08:17.570 We're not trying to, like, be physically accurate at all. 08:17.960 --> 08:25.010 So the gravity waves in the nucleus, so we can just turn down gravity or we can just turn the direction 08:25.010 --> 08:25.640 to zero. 08:26.180 --> 08:36.470 So these particles just kind of emit into like a bit, you know, just kind of like they're in space, 08:36.470 --> 08:37.070 basically. 08:38.750 --> 08:45.680 And let's let this run for a second and had escape and let's hear for so we can kind of see and I'm 08:45.680 --> 08:47.750 going to select the particle here from that letter. 08:47.750 --> 08:51.890 So it kind of highlights that I can kind of see the concentration here. 08:52.400 --> 08:59.560 So it's a decent amount and I think it's going to get us like a good starting point. 09:00.380 --> 09:08.030 So now we need a way to tell Miah to take these particles and use them as the center of new pieces for 09:08.030 --> 09:09.440 this piece of geometry here. 09:10.280 --> 09:15.170 So before we do that, we need to go through all the cleaning up of this piece so we can see that there's 09:15.170 --> 09:18.260 some history here and it's not frozen, transformed. 09:18.260 --> 09:22.200 So let's go modify, freeze transforms, let's go edit, delete by type history. 09:22.670 --> 09:22.970 All right. 09:22.970 --> 09:24.230 So now it's all clean. 09:25.610 --> 09:28.550 So for this tool to work, it's actually a script. 09:28.550 --> 09:36.380 I'm going to make it available for you in either a war document attached as a resource to download with 09:36.380 --> 09:37.280 all of these files. 09:38.180 --> 09:39.290 Most likely that's what it's going to be. 09:39.300 --> 09:42.530 It's going to be on the floor with all the other downloads. 09:42.560 --> 09:43.790 It'll be a text document. 09:44.210 --> 09:50.710 And its credit goes to Malik Williams, who created this almost 10 years ago. 09:50.720 --> 09:56.090 You can see I found this in a very obscure like page 15 on a forum. 09:56.840 --> 10:05.540 But Voronoi is a type of shattering effect that he basically made this script. 10:05.930 --> 10:13.430 So and any time you're doing Mel scripts, so that's my expression language you can see down here in 10:13.430 --> 10:14.870 the bottom left, it says anyo. 10:15.230 --> 10:20.040 So I got to start typing in all this code in here and run it from this little area. 10:20.420 --> 10:25.840 So any time you're using Mel and it has these two dashes, that means this isn't going to run. 10:25.850 --> 10:27.730 This is just for your information. 10:28.010 --> 10:31.910 So if you're curious about how the script works, you can actually just look for these little things 10:31.910 --> 10:34.820 and it's going to explain what each section is about. 10:34.820 --> 10:41.000 And this is just because he's a friendly guy and took the time to actually write this stuff out to explain 10:41.000 --> 10:43.340 what he's doing, he could have easily left this stuff out. 10:43.820 --> 10:46.040 So you can look at each little section. 10:46.040 --> 10:49.040 He's kind of explaining what each little piece does. 10:49.430 --> 10:55.070 And this is how a lot of people learn how to do scripts and learn Mya's get scripts like this and they 10:55.070 --> 10:59.090 kind of break it down and figure out, all right, what what is each little piece doing? 10:59.360 --> 11:02.740 So for us, all we need to know is, are we just going to copy paste this? 11:02.750 --> 11:04.280 You don't really need to know how it works. 11:04.850 --> 11:08.480 So we do he does have instructions here. 11:08.510 --> 11:11.420 He says select the particles and then the geometry. 11:11.730 --> 11:12.110 All right. 11:12.110 --> 11:13.310 And at zero for crack. 11:13.430 --> 11:13.820 All right. 11:13.830 --> 11:16.190 So we'll see, like the particles first. 11:16.310 --> 11:17.300 It's like the geometry. 11:17.300 --> 11:24.380 And then we can just paste that script here and hit enter and we're going to get this little dialog 11:24.380 --> 11:26.990 box and we want to set the crack to zero. 11:27.690 --> 11:29.850 So the distance between the cracks is zero. 11:29.870 --> 11:36.650 So now when we look at this thing, we can see that indeed we have this kind of fracture that is going 11:36.650 --> 11:41.450 to work with where we actually have an impact on this piece. 11:42.650 --> 11:45.050 So we can do this multiple times. 11:45.050 --> 11:51.920 And that's what I'm going to do, because, you know, if we were to do this for this whole piece and 11:51.940 --> 11:56.600 with one particle system in one go, like I said, it would take a very long time. 11:56.600 --> 12:03.590 But what I what we can do now is just keep repeating what we just did on each different shard so I can 12:03.590 --> 12:10.310 go back and move the emitter to a new location, you know, somewhere maybe closer to if I want to break 12:10.310 --> 12:10.970 up this piece. 12:10.970 --> 12:14.000 But I want it more broken up towards the top than the bottom. 12:14.900 --> 12:21.710 I'm going to move the emitter kind of closer to that area and then redo this whole process again. 12:21.840 --> 12:30.920 OK, so we all have a shattered piece of ground, ready to ready to simulate that is going to be specific 12:30.920 --> 12:33.860 to the animation that we have like this punching through this hole here. 12:33.860 --> 12:35.900 So we're going to have kind of a nice little hole here. 12:36.260 --> 12:38.720 Hopefully this is the plan anyways. 12:39.320 --> 12:44.720 And so it will be ready for the next lesson where we will, you know, have this all shattered. 12:44.720 --> 12:48.530 And then we are going to actually run a simulation. 12:48.530 --> 12:52.160 And I'm going to show you some more tips and tricks on how to do that efficiently. 12:52.220 --> 12:52.910 Thanks for watching.