WEBVTT 00:04.730 --> 00:05.810 Hello everybody. 00:05.810 --> 00:10.070 By the end of this lecture I'm hoping that we're going to be able to create something like this where 00:10.070 --> 00:15.770 a bowling ball is going to be smashing into a ton of pins and doing a lot of the hard work for us using 00:15.770 --> 00:17.410 Blender's physics engine. 00:17.840 --> 00:21.490 Hey everybody I'm super excited to start playing with some physics. 00:21.560 --> 00:26.390 Now this is an insert lecture so I'm concerned you in from the future have come back and I thought you 00:26.390 --> 00:26.990 know what. 00:27.020 --> 00:29.510 We've got some bowling pins and a bowling ball. 00:29.510 --> 00:34.430 Why don't we just smash them together and try out the blender physics engine and see what we can do 00:34.430 --> 00:35.030 with that. 00:35.030 --> 00:39.780 Far more exciting than just looking at them and positioning them in a sort of a static manner. 00:39.980 --> 00:44.900 So first of all we need to go ahead and learn a little bit about the physics in order to do this I'm 00:44.900 --> 00:50.180 going to go and grab the pin that I've made earlier and will use that as a good starting point so let's 00:50.180 --> 00:52.820 go and open up your bowling pin. 00:52.820 --> 00:56.340 And here we go I've got my bowling pin here I'm going to switch to perspective mode. 00:56.360 --> 01:00.890 Now I'm going to send to my thrilly cursor I'm going to pop it in the middle of the scene by this couple 01:00.890 --> 01:07.250 of ways of course we can do this with a new shift an S and do the cursor to centre or we can go shift 01:07.250 --> 01:08.770 and see which is a really quick way. 01:08.780 --> 01:13.350 But it does move the cam your viewport around ever so slightly. 01:13.370 --> 01:19.310 Now we're missing a little bit of a screen that we're going to need some going to go down to the dividing 01:19.310 --> 01:23.390 Widget the splitter widget and make a new area underneath. 01:23.450 --> 01:27.450 And I'm going to change that to a type that is the time line. 01:27.530 --> 01:33.350 Now you may already have this on here as default is going to make my viewing area just a little bit 01:33.350 --> 01:35.930 bigger as well as make sure grab the right area. 01:35.930 --> 01:36.590 There we go. 01:36.770 --> 01:44.780 So this is a time line it's a 250 frames and our frame rate if we go over to the properties area and 01:44.780 --> 01:49.940 have a look at the little camera our frame rate is set at 24 frames per second so that's a little over 01:49.940 --> 01:51.180 10 seconds. 01:51.230 --> 01:55.080 Now at the moment we don't have much in our scene to interact with. 01:55.100 --> 01:58.520 So let's go ahead with the cursor the 3D cursor in the centre. 01:58.550 --> 02:02.650 I'm going to go ahead and add a plain scroll up here. 02:02.690 --> 02:05.740 And that plane is going to act like the ground. 02:06.190 --> 02:11.660 I'm going to scale that up and I'm going to call it the ground straightaway because I know sometimes 02:11.660 --> 02:14.760 I'm a bit naughty and I don't name things as quickly as I should do. 02:14.780 --> 02:18.920 So we've got the ground there that's something that the pin can knock against. 02:18.950 --> 02:24.590 Now what we can do there's a lot of in-depth stuff we can do with physics but for for this lecture let's 02:24.590 --> 02:26.810 just keep it nice and simple. 02:26.810 --> 02:32.810 And I'm going to use the tool shelf over on the left hand side and I'm going to go down to where it 02:32.810 --> 02:38.360 says physics on physics tab and I'm going to select everything in my scene. 02:38.360 --> 02:42.720 I'm going to hit the aiki twice and then select add active. 02:42.920 --> 02:49.040 Now there will be an error of error because it cannot add a rigid body to a non mesh object which is 02:49.040 --> 02:49.640 fine. 02:49.660 --> 02:52.900 It can't add that to the lamp to the camera etc.. 02:52.910 --> 02:57.740 So let's ignore the fact that we've got that error there and just see what happens when we go ahead 02:57.740 --> 03:00.090 and hit the play button that's on the timeline. 03:01.040 --> 03:03.570 Hey everything's falling away into the distance. 03:03.650 --> 03:08.030 Now the problem there of course is if I mean it plate the camera around can probably still see it falling 03:08.030 --> 03:08.390 away. 03:08.390 --> 03:08.980 Yep. 03:09.350 --> 03:14.970 The problem of course with that is that the floor is falling away as well. 03:15.050 --> 03:17.900 And that's because we've added it as an active. 03:18.020 --> 03:24.800 So if I just pause that and set it back to the very beginning and I'm going to have to focus on my view 03:24.800 --> 03:29.230 again this move this around come back in there again. 03:29.390 --> 03:34.460 So what we need to do is set the floor because we don't want it to move but we still want it to interact 03:34.490 --> 03:35.580 with other objects. 03:35.660 --> 03:38.790 We want to say add passive. 03:38.910 --> 03:45.810 So now the floor is passive and the pin itself is active when we go ahead and press play. 03:46.140 --> 03:49.840 Okay the pin is just wobbling not doing anything else. 03:49.970 --> 03:51.320 So there are a couple of issues here. 03:51.320 --> 03:58.610 The first one is that the centre of mass that this pin is operating around is its origin. 03:58.880 --> 04:03.710 And obviously that would mean that it's very very bottom heavy at the moment we can see it just gently 04:03.710 --> 04:05.150 wobbling backwards and forwards. 04:05.270 --> 04:13.700 Now let's reset the scene back to frame one select tar pin lift it up slightly and rotate it and then 04:13.700 --> 04:14.930 press play. 04:14.930 --> 04:16.080 And let's see what happens. 04:16.100 --> 04:20.820 Okay so this does look like it's bottom heavy and that would be a really rubbish pin. 04:20.990 --> 04:26.270 So this is one of those cases where we've set the origin to the bottom of the object in order to work 04:26.270 --> 04:30.020 on it properly and have a bottom to the objects. 04:30.050 --> 04:35.540 But the downside to this is now it's centre of gravity is also at the bottom and we need to set the 04:35.600 --> 04:37.850 origin to the centre of gravity. 04:37.850 --> 04:41.760 Now there are a couple of ways of doing that but the easiest one is with the object selected. 04:41.840 --> 04:47.570 We go back over to the tools go to tools at the very top and go to set origin and that's enabling us 04:47.570 --> 04:52.920 to move this origin and we can set it to even the geometry that might work. 04:53.030 --> 04:57.340 The centre of mass by the surface area or the centre of mass by the volume. 04:57.340 --> 05:01.220 Now in this case I'm going to pick the volume and we can see it's moved our object. 05:01.250 --> 05:03.320 We're going to have to lift it back up. 05:03.320 --> 05:09.830 Now when we go ahead and drop it whilst it's Lent at a certain angle Oh make sure you start it from 05:09.830 --> 05:10.930 the very beginning. 05:11.070 --> 05:14.500 We can see there that it behaves much more naturally. 05:14.600 --> 05:20.430 If I put it a more extreme angle then we should see it fall over and rock appropriately. 05:20.570 --> 05:21.320 Excellent. 05:21.320 --> 05:22.720 So that's a great start. 05:22.730 --> 05:24.220 An introduction to the physics. 05:24.230 --> 05:28.910 Couple of other things that you might want to do and you do this over in the physics properties. 05:28.910 --> 05:30.570 Plenty to play with here. 05:30.830 --> 05:34.370 So we go over to the propertys area and all the way at the very end. 05:34.370 --> 05:38.440 There's something that looks like a little bouncing ball with a blue tail coming out of it. 05:38.450 --> 05:40.160 Those are your physics. 05:40.250 --> 05:46.610 And here we have a lot of options now in this particular case the ones that I would definitely play 05:46.610 --> 05:47.940 with are its mass. 05:48.080 --> 05:50.630 This is approximate mass in kilos. 05:50.700 --> 05:56.150 And if we scroll down further we've got its surface response how bouncy is what happens if we turn the 05:56.150 --> 05:57.710 bounciness up to one. 05:57.710 --> 06:03.110 I don't know I presume it's going to bounce more boin There we go it's bouncing and skipping across 06:03.110 --> 06:04.400 the surface a little more. 06:04.400 --> 06:11.330 So these are all things that you can play with and basically make it act like you want it to and it 06:11.330 --> 06:13.120 can be a bit fiddly sometimes. 06:13.180 --> 06:18.470 Of course if you set the friction down to zero guess what happens then is just going to kind of scoot 06:18.470 --> 06:19.090 across as well. 06:19.090 --> 06:21.540 It's given a completely different reaction this time. 06:21.740 --> 06:26.010 So there's lots to play with and each change you make will have a slightly different effect. 06:26.010 --> 06:29.900 Obviously if you put more objects in your scene that's going to make a difference. 06:29.930 --> 06:36.680 Now one of the things that is incredibly important is applying your transforms because if we've scaled 06:36.680 --> 06:41.870 this pin at any point in time but to reveal whether they did or not I can't remember then it will be 06:41.870 --> 06:48.680 behaving wrong because it will be behaving like the small or larger version of itself prior to being 06:48.680 --> 06:55.970 scaled so let's hit the end key and making sure that selected scroll up to the scale the scale is at 06:55.970 --> 06:56.480 once. 06:56.480 --> 06:59.680 That's absolutely fine if the scale was anything else. 06:59.720 --> 07:06.410 We did have some weird stuff happening with the physics and all you need to do to sort that out is control 07:06.410 --> 07:15.530 an A to apply and then scale and you can also get that from the object menu ply and then scale and it 07:15.530 --> 07:18.380 should set to 1 and that's incredibly important. 07:18.380 --> 07:21.250 And let's see if we can invoke that now by scaling it. 07:21.350 --> 07:25.100 So now it's this big is going to act as if it was the much smaller object. 07:25.100 --> 07:30.020 Now I don't know if that's going to cause us any issues let's lift it up out of the ground slightly 07:30.030 --> 07:33.230 turn it around and see how it acts now. 07:33.400 --> 07:37.280 Or you can see that didn't really act like the scale it's supposed to be. 07:37.280 --> 07:41.960 So if I go and apply that scale and then come back to very beginning. 07:41.960 --> 07:43.680 Now let's see what happens. 07:43.850 --> 07:48.800 Now it behaves more like a 1 kg object of this size. 07:48.800 --> 07:52.570 If we change the weight of it or hundred Let's see what happens then. 07:54.210 --> 07:59.040 Much more dead and reaction and a much larger object of course so play with that. 07:59.040 --> 07:59.870 We said it's a point. 07:59.880 --> 08:06.240 Ones are very light objects probably find it falls and bounces much more than it would have done before. 08:06.300 --> 08:09.670 Lots of things you can play with lots of exciting things to do. 08:09.870 --> 08:14.040 And of course along with that it's time for a little challenge. 08:15.180 --> 08:19.090 And your challenge is to go ahead and have some fun with physics. 08:19.140 --> 08:20.020 So don't worry. 08:20.040 --> 08:23.540 Later on in the course we will have a much more detailed look at the physics. 08:23.550 --> 08:28.920 I know after seeing this you're going to be really hungry for more of that physics engine. 08:28.920 --> 08:34.290 But later on when we look at destruction and blowing things up we'll take a closer look at the physics 08:34.290 --> 08:36.390 engine in much more detail. 08:36.510 --> 08:42.270 I'd like you to go ahead and make a bowling ball smash into a load of pins now in order to do that. 08:42.270 --> 08:48.030 I would suggest you make use of a ramp to have the bowling ball gather up as much speed as possible 08:48.330 --> 08:53.420 and you might have to make the bowling ball itself a little heavier than it is currently. 08:53.580 --> 08:57.380 So it has a bit more mass to push through those pins. 08:57.470 --> 08:59.740 Pause a video now and give that a go. 09:01.570 --> 09:02.800 Hello everybody welcome back. 09:02.800 --> 09:04.240 Did you have fun with physics. 09:04.240 --> 09:05.230 I certainly did. 09:05.230 --> 09:07.050 Let's go see what I got up to. 09:07.240 --> 09:13.450 Okay so now that our original bowling alley has got a few things flying here there are a couple of options 09:13.450 --> 09:14.310 of how we can approach. 09:14.320 --> 09:19.810 The first thing I'm going to do of course is name my bowling alley with an alley make sure that the 09:19.810 --> 09:21.540 ground is named appropriately. 09:21.580 --> 09:23.670 The pins are fine and we've got a bowling ball. 09:23.770 --> 09:30.130 Okay so I need to select everything in my scene and I'm going to go straightaway and add an active physics 09:30.130 --> 09:34.930 to it select my ground and add a passive rigid body to it. 09:34.930 --> 09:37.060 Let's just press play now and see what happens. 09:37.060 --> 09:44.060 Everything falls down and those those pins are not behaving as they should be. 09:44.080 --> 09:49.960 Some will select everything and I think I'm safe to do that yeah everything sir a regular shape and 09:50.060 --> 09:54.790 set the origin to the centre of mass by volume and then I'm going to press play again to see what's 09:54.790 --> 09:55.960 going to happen. 09:56.440 --> 09:59.340 Okay now for maximum carnage. 09:59.350 --> 10:06.040 I could pick up this ball and just starts knocking these things flying like so that's one option. 10:06.160 --> 10:11.400 But what happens if I stick a ball in the middle of a ton of pins. 10:11.410 --> 10:16.360 Now we've got a couple of pins falling over already now because these already have physics apply to 10:16.360 --> 10:19.990 them what I could do here is in orthographic meridan looking from the top. 10:19.990 --> 10:26.620 I used add a ton of of these pins and just see what happens. 10:26.620 --> 10:32.770 I'm hoping it would just knock a ton flying and hopefully all some of these are put inside themselves 10:32.770 --> 10:39.640 so I'm expecting them to freak out a little and send things absolutely crazy bullets to see what happens 10:39.640 --> 10:40.860 when I press play. 10:41.820 --> 10:42.730 Well they just kind of. 10:43.020 --> 10:49.350 Not one another over you know I'd be a bit more exciting if I was to rotate the ground ever so slightly 10:49.350 --> 10:49.920 like this. 10:49.920 --> 10:51.900 Everything falls over regardless. 10:54.950 --> 10:55.490 Are we not. 10:55.520 --> 10:57.260 You know what we could do here. 10:57.260 --> 10:58.980 If it works like that. 10:59.130 --> 11:02.070 A wonder of any of use you experimented like this. 11:02.210 --> 11:05.280 So if you rotate the ground everything will fall down that's great. 11:05.390 --> 11:12.770 But that's that's not that exciting but what we can do is we can duplicate the ground rotate it and 11:12.770 --> 11:16.310 actually have the bowling ball coming down that ground. 11:17.260 --> 11:19.720 And hitting and striking our pins this way. 11:19.720 --> 11:24.160 So let's make sure we're right at the beginning of our scene and I'm going to move my bowling ball. 11:24.160 --> 11:26.590 So it's going to fall onto that ground and roll down. 11:26.590 --> 11:28.360 How cool is that going to be. 11:28.390 --> 11:30.810 Now this is what I mean by experimentation. 11:31.060 --> 11:33.870 So the bowling balls coming down it's picking up speed. 11:33.880 --> 11:38.520 Obviously some of these are already knocked over and it didn't get very far. 11:38.530 --> 11:39.700 So what can we do here. 11:39.700 --> 11:47.290 Well it's probably still really really light so if I go into physics properties and change that's all. 11:47.610 --> 11:50.400 Let's set it as a as a whole ton. 11:50.440 --> 11:56.530 Hopefully that means it will just hit the floor pick up speed as it hits there and then it should start 11:56.530 --> 11:58.220 busting through everything. 11:58.330 --> 11:59.640 Perfect. 11:59.920 --> 12:00.230 Okay. 12:00.250 --> 12:06.410 The next thing I want to do is just stop these other ones from falling over straight away. 12:06.490 --> 12:10.290 So my gut reaction was to have them in there initially for a bit of fun. 12:10.690 --> 12:12.530 Let's just press play. 12:12.580 --> 12:15.450 K There are a couple of things that are falling over there. 12:16.720 --> 12:18.270 Let's go back to the beginning. 12:18.370 --> 12:21.480 It's that one there's pushing through so we can delete that. 12:21.730 --> 12:22.980 Let's just press play again. 12:22.990 --> 12:23.450 Yeah. 12:23.560 --> 12:27.510 There's a whole group of eight in the middle here that are pushing through one another. 12:27.700 --> 12:33.520 And that is because I put them next to one another when I started so if I move those ever so slightly 12:33.520 --> 12:36.440 to their impress play they're dropping down. 12:36.440 --> 12:37.290 We're all good. 12:37.290 --> 12:42.540 Well good Where's that ball and smash with a mega strike. 12:42.730 --> 12:48.190 Okay how did you guys get on did you experiment a little further and start adding in slopes and stuff 12:48.190 --> 12:50.580 like this to get the ball going really quickly. 12:50.620 --> 12:53.030 Do show me what experiments you came up with. 12:53.060 --> 12:54.390 I look forward to seeing them. 12:54.460 --> 12:57.140 And of course I will see you all in the next lecture.