WEBVTT 00:00.210 --> 00:03.810 Welcome to fracturing with a child object. 00:03.810 --> 00:08.880 So this again is all about manual destruction taking control over our model. 00:09.060 --> 00:15.750 So this is a great way of adding some dynamic fractures to a model fracturing we use the children's 00:15.750 --> 00:20.840 geometry as a reference point and we'll see that in more detail in a few moments. 00:20.970 --> 00:25.230 We're going to experiment with different children to see if they give different results. 00:25.500 --> 00:30.730 And finally a good example of this use is the splintering of wood. 00:30.750 --> 00:32.950 And I'll show you how to do that too. 00:33.210 --> 00:36.350 So let's hop straight on over in a blender. 00:36.690 --> 00:41.640 Okay so we're starting over now with Edie Falco you've been going to make it a lot flatter more like 00:41.640 --> 00:43.280 a plank than anything else. 00:43.290 --> 00:47.910 I'm going to go ahead here and say that on the x axis make it quite thin. 00:47.910 --> 00:50.040 Scale it by point one on the x axis. 00:50.140 --> 00:56.580 They just scale up on everything but the x axis by maybe far no for all not forty four for Alex to me 00:56.790 --> 01:02.630 and materne Snapping onto increments so I can just move it to one side and pull that up. 01:02.670 --> 01:03.840 I'm going to duplicate that. 01:03.840 --> 01:09.410 Moving along the y axis so we got two next to each other that we can look at and we can see the big 01:09.410 --> 01:10.080 or the cube. 01:10.080 --> 01:12.970 So I'm going to add in. 01:13.170 --> 01:17.560 That's to say something right on the edge here because on a see what happens right on the nose I'm going 01:17.550 --> 01:24.090 to add in a UV sphere there and I'm going to add in another yuryi sphere here. 01:24.360 --> 01:25.160 Excellent. 01:25.350 --> 01:31.380 I'm going to go to this one here an ad in a cube mesh cube. 01:31.440 --> 01:36.600 I will do the same stober here mesh cube and about. 01:36.720 --> 01:40.530 A final one in here but I'm also going to scale that down as well. 01:40.530 --> 01:46.830 So you just got a few different options that I'm going to select everything and just apply the scale 01:46.830 --> 01:51.210 to everything because I've been moving things about if I am just going to add a tiny 01:53.490 --> 01:58.210 sphere just here's a scale that down and then just apply the scale there as well. 01:58.560 --> 02:00.990 Okay so we've got some objects there. 02:00.990 --> 02:08.850 Now we really need to make them children of these planks behinds select all of these spheres and have 02:08.850 --> 02:11.270 gun control and P along with a select B. 02:11.360 --> 02:11.590 Yeah. 02:11.610 --> 02:19.060 Object That's fine so they're all now children of that plank and the same here so controlled MP object. 02:19.170 --> 02:22.960 Okay so we've now got two objects with children. 02:23.190 --> 02:28.600 Let's see what happens if we go and use the cell fracture till the start of the spheres themselves going 02:28.630 --> 02:32.380 hit the space bar type in cell phone bigger cell fracture. 02:32.580 --> 02:37.100 And now we get the options along the top and we want to use child vertices. 02:37.140 --> 02:43.830 Now obviously charred particles which is the fourth option along would be if these individual objects 02:44.190 --> 02:48.900 the children had a particle system applied to them we're not going to deal with particle systems at 02:48.900 --> 02:49.500 the moment. 02:49.500 --> 02:55.410 Some of the check select here childbirths vertices and aren't going to up the level here of shards that 02:55.410 --> 03:02.730 are created or the maximum number of shards that can be created from 100 to 300. 03:02.730 --> 03:04.590 So there's plenty going on here. 03:04.600 --> 03:09.980 I'm going to click okay I'm going to change anything else and we can see here as it's as asset as it's 03:09.990 --> 03:12.670 making it how it's shattering a part. 03:12.690 --> 03:15.900 Our particular model here I don't know how long this is going to take. 03:15.900 --> 03:18.100 Hopefully three hundred isn't too many. 03:18.120 --> 03:18.950 No that's done. 03:18.950 --> 03:19.830 Perfect. 03:19.860 --> 03:24.160 And of course this was been put on to Layer two. 03:24.180 --> 03:28.520 Now I'm actually going to move this one here and it's children. 03:29.130 --> 03:31.480 So I'm going to move that to Layer three. 03:31.600 --> 03:33.200 No go to lay a three. 03:33.390 --> 03:39.990 And I'm going to now run the cell fracture tool again with exactly the same settings so we can compare 03:39.990 --> 03:40.800 the two. 03:40.920 --> 03:42.240 And that was a lot quicker. 03:42.240 --> 03:45.760 So let's have a look at what happens with the spheres themselves. 03:45.780 --> 03:50.150 Now the sphere itself has lots of vertices in it compared to those cubes. 03:50.190 --> 03:53.780 So I'm not surprised that we've got more asrs. 03:54.710 --> 03:55.520 Select everything. 03:55.530 --> 03:59.020 Now we've got more detail than we would do otherwise. 03:59.770 --> 04:02.270 And it is concentrated around here. 04:02.680 --> 04:07.920 Now one of the things that would be a good idea check is going and turning gravity off. 04:08.950 --> 04:11.440 Now it's fighting gravity there is turn it off. 04:11.670 --> 04:16.100 And add a rigid body to all of this and just make sure it's not flying apart. 04:16.120 --> 04:21.060 You know before we do anything else is this just going boom all over the place. 04:21.090 --> 04:25.590 Now one way of just checking to make sure that is working how would expect two is to little she grab 04:25.590 --> 04:32.130 one of the pieces press Escape when you finish doing it and we can see that that can shatter into quite 04:32.130 --> 04:33.540 a few pieces. 04:33.540 --> 04:34.400 Brilliant. 04:34.500 --> 04:35.380 I love that. 04:35.490 --> 04:41.410 Let's go have a look at how the other one has behaved so that's on labour force or with over there. 04:41.490 --> 04:44.840 Let's to see what that looks like that selects everything. 04:44.970 --> 04:49.720 Okay so that's been broken into far far fewer peep people pieces. 04:49.860 --> 04:54.490 And well let's just run the physics effect on Matt and just see. 04:54.750 --> 04:55.720 Okay. 04:56.190 --> 05:00.240 So it's all to do with the number of little clues in the name the number vertices. 05:00.240 --> 05:04.180 The children have this and that looks pretty awesome. 05:04.230 --> 05:10.080 Now because of move that they're placed in a different position when it starts they're actually intersecting 05:10.080 --> 05:12.580 one another so they're forcing each other apart. 05:12.600 --> 05:14.250 So I'm just going to spoors that. 05:14.250 --> 05:16.350 Go back we can see I have moved the piece. 05:16.350 --> 05:19.100 I'm just going to undo until it's in the right place. 05:19.140 --> 05:21.380 So that is a warning to you guys. 05:21.510 --> 05:24.630 Although it's fun to grab things and move them about and knock. 05:24.750 --> 05:27.870 I don't think this has got physics applied to it. 05:29.560 --> 05:32.250 You can very easily end up breaking stuff. 05:32.310 --> 05:34.300 Ah this one actually flies apart by itself. 05:34.300 --> 05:36.930 Or is that me Mike removing things. 05:36.930 --> 05:40.520 So I'm just going to undo a couple of times. 05:40.570 --> 05:42.700 There he goes to that point then just press play. 05:42.730 --> 05:47.040 A case of that is flying apart so we would need to work on that. 05:47.080 --> 05:50.650 In fact there's one last thing to just try here. 05:50.950 --> 05:51.250 Right. 05:51.250 --> 05:54.560 That's before reapply and play. 05:54.920 --> 06:01.180 Okay so that's definitely got some problems there so we need to work on the margins in order to sort 06:01.180 --> 06:01.890 that out. 06:01.890 --> 06:04.550 I'm not gonna play too much in terms of detail. 06:04.630 --> 06:11.320 So figuring out how to break this one apart sensibly of course we could just enable animation when it 06:11.320 --> 06:14.330 comes to something hitting that and it breaking up. 06:14.710 --> 06:22.150 Okay so something like wood is a bit well it's a bit more difficult bit more complex than that and I'll 06:22.150 --> 06:27.520 show you the rough idea behind what you can do because we just use primitives at the moment but we need 06:27.520 --> 06:31.770 something a bit more exciting a bit more jagged in order to do that. 06:31.780 --> 06:36.880 So I'm just going to start up a new blender faster have to worry about that I'm going to scale this 06:37.180 --> 06:43.270 on the z axis by five among this scale it not on the z axis by point two so that's very thin. 06:43.270 --> 06:47.690 That looks good to me almost like a wooden chair leg or something along those lines. 06:47.980 --> 06:48.570 Okay. 06:48.700 --> 06:53.560 So now we've got that I'm going to add in their plane and this is going to be are child objects so I 06:53.560 --> 06:56.310 might as well parent them together now. 06:57.410 --> 07:02.540 Okay so this charred object here needs to create some jagged edges. 07:02.550 --> 07:03.390 How do we do that. 07:03.390 --> 07:08.820 Well there's a couple of ways of doing that so the easiest that I've found so far and I'm going to scale 07:08.820 --> 07:12.480 this up at this point and scale the plane back down. 07:12.600 --> 07:13.580 Okay. 07:13.590 --> 07:19.860 So now we have the plane there we are actually going to go in to edit mode and subdivide it into lots 07:19.860 --> 07:21.450 and lots of little pieces. 07:21.600 --> 07:28.710 So I'm going to go up to maybe 20 it's going to seem a bit much at first but bear with me. 07:28.860 --> 07:32.580 If we scroll down when we subdivide this is fractal option. 07:32.700 --> 07:38.280 And if you go a bit crazy it does go a bit crazy so don't go too high you don't want them crossing over 07:38.280 --> 07:38.870 one another. 07:39.000 --> 07:40.810 But we want them a bit jagged. 07:40.860 --> 07:46.710 Once you've done that you can then scale that on the z axis to make it even more exaggerated. 07:46.800 --> 07:51.960 And we can just make that really big like splinters and just going to scale that in. 07:51.960 --> 07:57.060 So it's kind of just popping out so I'm not losing any of the detail there. 07:57.180 --> 07:58.090 That is really good. 07:58.110 --> 08:03.630 Okay so we've got this all set up so we can go straight to this object that we want to splinter that 08:03.630 --> 08:08.670 we want to use a child of colour cell fractures we've done before macia Selected on child. 08:08.850 --> 08:14.730 Now because we're actually breaking apart slowly with lots and lots of pieces wood tends to splinter 08:14.730 --> 08:15.360 lots. 08:15.480 --> 08:21.720 And when we go to this area here the source limits and set that so all five hundreds that's got plenty 08:21.720 --> 08:23.790 of opportunities to splinter. 08:23.790 --> 08:28.860 Now as we go down here there's something else that you can work on and that's the scale. 08:28.860 --> 08:31.560 Now this goes from zero to 1. 08:31.560 --> 08:33.600 This is X Y and Z. 08:33.600 --> 08:42.930 Now we're only really dealing in the z direction and we want to emphasize the actual said all that stretchiness 08:43.180 --> 08:48.240 and the zigzag that we've got there we want to make sure there's a splintery and as sharp as possible. 08:48.420 --> 08:52.480 So in this case we want to turn this down in order to exaggerate. 08:52.500 --> 08:54.570 I'm not quite sure how low I need to go. 08:54.570 --> 09:01.020 This is one of these cases where practice and also just trying out settings if you're doing this on 09:01.020 --> 09:06.390 a big project you just go off to one side open up a new file and just play with the model append it 09:06.390 --> 09:11.020 in to your heart's content you have muck around with it and not ruin the main model. 09:11.030 --> 09:16.680 So I'm trying to click okay here and pray it doesn't crash Blender's it might take a while to go through 09:16.890 --> 09:18.230 and use the child vertices. 09:18.230 --> 09:21.320 There we go is starting to go through and sort it out. 09:21.450 --> 09:29.790 Now one of the issues that you may come across excuse me is the shards being too big and clunky. 09:29.850 --> 09:35.490 And again that's something you just have to work on you have to adjust settings and just try out different 09:35.490 --> 09:39.060 ways of basically breaking apart the model. 09:39.060 --> 09:44.000 Now we may have actually ended up with too many shards here nope they've come back in. 09:44.130 --> 09:50.990 Occasionally when you do this type of tourney with a bit more complex a model it can go a bit wonky. 09:51.050 --> 09:53.310 Okay I think that's now done. 09:53.310 --> 09:54.230 So I'm going to. 09:54.270 --> 09:55.190 All right. 09:55.500 --> 09:56.790 We've got lots. 09:56.790 --> 09:58.770 How many did it break into in the end. 09:58.890 --> 10:00.500 Almost all 500. 10:00.500 --> 10:03.710 Wow lots of lots of things to break into. 10:03.720 --> 10:05.930 So let's go to the second layer. 10:05.940 --> 10:12.570 And again I'm just going to turn off gravity we can see this top and bottom bet almost intact compared 10:12.570 --> 10:13.230 to the rest of it. 10:13.230 --> 10:19.140 Now going to turn off gravity once again just to make sure that when we knock it into things and play 10:19.140 --> 10:22.360 with it we're actually seeing it work as is. 10:22.380 --> 10:23.510 So that's Pressplay. 10:24.360 --> 10:26.310 And it doesn't throw itself apart. 10:26.310 --> 10:27.050 Brilliant. 10:27.300 --> 10:27.550 Okay. 10:27.570 --> 10:34.710 Let's just play again and see how many pieces we've splintered that in so all quite a few and if we 10:34.710 --> 10:40.060 just pause that there if that had used the right key that had a wood texture on it. 10:40.080 --> 10:43.530 Of course wood doesn't quite blow apart like that. 10:43.530 --> 10:49.100 So we've got some other things to play with but you get the idea that now it's shattered in the middle 10:49.110 --> 10:52.800 around where we had those splint and that those splinter rings happening. 10:52.920 --> 10:58.110 And the other thing you can do at this point of course is let's just undo all of that no undoing all 10:58.110 --> 10:59.160 the hard work. 10:59.220 --> 11:01.650 And this is before the splinter happened. 11:01.650 --> 11:02.090 Yes. 11:02.280 --> 11:10.560 Now I can take this splintering child and of course duplicate it move it up rotate it round by maybe 11:10.860 --> 11:15.930 on the ball would we want the x axis by 180s that's the other way up. 11:16.110 --> 11:20.510 And it is still be a child and using They'll create a different type of break. 11:20.520 --> 11:26.670 Again we can go in and using the selfridge's I'm not going to set it at 500 this time we're going to 11:26.670 --> 11:30.870 lower it down as an idea of what can happen just clicked okay. 11:30.870 --> 11:35.090 Now this is covered up of course by what's going on here. 11:35.100 --> 11:40.050 In fact the higher level might have been a bit better higher source limit has now got to places that 11:40.050 --> 11:45.390 are being fractured and you can end up obviously to have these a jagged thing like this you could use 11:45.390 --> 11:47.730 a plain slicing through it if you wanted. 11:47.730 --> 11:51.120 So let's just go and have a quick look at how that's going to behave. 11:51.240 --> 11:52.820 Let's add an active to that. 11:52.820 --> 11:53.440 I don't. 11:53.490 --> 12:00.150 Yeah we have Undun gravity so that put gravity off again and let's play it's not coming apart but you 12:00.150 --> 12:05.250 can see there how it's splintered in the middle but further raap on this particular angle of pause it 12:05.250 --> 12:11.540 there further up the splintering is a bit like wood it's split apart pretty awesome. 12:11.550 --> 12:13.680 Hey excellent. 12:13.680 --> 12:21.240 So this is a bit of a zero gravity example but if you're doing slow mo it's almost good to have gravity 12:21.240 --> 12:27.300 off or at least a very low value of gravity so that pieces aren't falling way quite as quickly in your 12:27.300 --> 12:28.230 scene. 12:28.270 --> 12:29.970 So that has come out pretty well. 12:29.970 --> 12:32.700 I love the splintering effect that's come up here. 12:32.820 --> 12:38.280 Now this particular lecture is not having a challenge because I'd like to go straight in and show you 12:38.280 --> 12:39.860 the same tool. 12:39.900 --> 12:46.110 But this time using the grease pencil to control it and then once we've mastered the fracture tool will 12:46.110 --> 12:49.460 be very close to the end of section challenge. 12:49.500 --> 12:53.910 If you played with this a little further and come up with something pretty awesome which I'm sure you 12:53.910 --> 13:00.060 guys can do remember to share with us so we can see your efforts over on the forum and I will see you 13:00.060 --> 13:02.110 guys in the next lecture.