WEBVTT 00:00.600 --> 00:03.830 Welcome to force fields and particles. 00:03.870 --> 00:09.660 So what are they won't force fields are not SHIELDS that will protect you against anything but they 00:09.660 --> 00:13.720 are a way of exerting different forces onto our models. 00:13.770 --> 00:20.250 And specifically we're going to have a look at particles in this lecture they affect particles more 00:20.250 --> 00:23.240 so than meche objects were play would mesh objects. 00:23.250 --> 00:24.650 In the next lecture. 00:25.140 --> 00:32.190 Now they do not affect themselves or an object if they are part of the physics for that object. 00:32.340 --> 00:33.900 And we see that in closer detail. 00:33.900 --> 00:36.650 Once we hop on over in a blender. 00:36.990 --> 00:42.660 Okay so now that we're over in blender Let's go ahead and first of all make sure that when we're using 00:42.660 --> 00:48.990 the force field itself are no other forces in our scene could be playing with it. 00:48.990 --> 00:56.750 So first of all let's go ahead and pop on a particle system so let's select ucu first particles. 00:56.790 --> 00:58.410 A new particle system. 00:58.500 --> 01:04.770 Now I'm going to set the lifetime to 200 so they do not disappear and moschonas at the end of our scene 01:04.920 --> 01:06.380 two hundred two. 01:06.720 --> 01:11.610 So let's go ahead first of all before we even add a forcefield Let's go and play our animation. 01:11.640 --> 01:17.370 So the first thing we can see here is they are falling and that's because gravity on the scene is turned 01:17.460 --> 01:18.090 on. 01:18.090 --> 01:23.670 So in this case I'm going to turn gravity off some going to go to the scene menu and it's seen properties 01:23.670 --> 01:27.490 here and go down to gravity and just until the gravity box. 01:27.840 --> 01:28.400 Okay. 01:28.560 --> 01:33.900 So now the particles are still moving so there must be some force acting upon them. 01:33.900 --> 01:35.400 Now what could that force be. 01:35.400 --> 01:41.270 Well I'm not going to get you to guess at this point because it's hidden deep in the particle setting 01:41.280 --> 01:45.590 So let's go ahead and switch back to the particle properties and scroll down. 01:45.900 --> 01:48.690 And at some point down here we get to velocity. 01:48.690 --> 01:55.570 So they're having an initial velocity normal to the faces that they're being emitted from of one. 01:55.580 --> 01:58.210 Now I'm going to set that down to zero. 01:58.380 --> 02:07.200 Now as the particles come alive and over frame one two hundred they just get stuck to the face of our 02:07.200 --> 02:07.790 model. 02:07.950 --> 02:13.560 So I'm just going to lower that down to 50 so they all appear in the first quarter of our scene of our 02:13.560 --> 02:15.210 little animation that we're playing. 02:15.480 --> 02:16.060 Okay. 02:16.200 --> 02:19.440 So there are a couple of ways of adding force fields. 02:19.440 --> 02:21.180 One is to the object itself. 02:21.180 --> 02:25.190 Now this cube is the emitter of those particles. 02:25.230 --> 02:32.340 Therefore if we go and add a forcefield to it it does not affect the particles that are being emitted. 02:32.580 --> 02:42.000 If we duplicate this cube over here we can see Virts let's just let the whole animation reset. 02:42.940 --> 02:43.630 Okay. 02:43.720 --> 02:50.020 There they're actually pushing each other's particles away because of the forcefield itself. 02:50.020 --> 02:55.210 Now let's have a closer look at the force field settings so let's scroll down here so we've got a strength 02:55.270 --> 02:55.890 of one. 02:56.020 --> 02:57.410 Let's go back to the top. 02:57.550 --> 02:58.840 Jumping ahead there. 02:58.870 --> 03:01.810 So we've got what type of forcefield is it. 03:01.810 --> 03:04.450 And there are lots to pick from. 03:04.450 --> 03:06.420 Only to leave it as force for the moment. 03:06.430 --> 03:07.870 It's a point force. 03:07.960 --> 03:10.540 And with all the settings left there's the fault. 03:10.540 --> 03:16.460 It will be as if the force itself is being pumped out in every direction. 03:16.510 --> 03:22.290 Equally we've got the strength of the force now the force strength can be negative and positive. 03:22.330 --> 03:28.180 So the moment this cube on the right is pushing away the particles of the cube on the left. 03:28.330 --> 03:32.670 However we can if we type in minus one it'll actually suck them in. 03:32.680 --> 03:40.250 Now the particles themselves will not actually impact of Cube yet because we've not set it to have collision. 03:40.270 --> 03:45.070 If we clicked the collision as well we should see the particles hit the surface and start bouncing off 03:45.400 --> 03:48.910 and deflecting and then being attracted back again. 03:48.910 --> 03:53.830 So this could be great for some sort of I don't know orbital mechanics we are trying to get something 03:54.040 --> 04:00.460 to follow around in fact on this particular cube itself we can see that they're just falling out of 04:00.460 --> 04:01.410 the faces. 04:01.480 --> 04:06.640 But in the particle settings themselves we can scroll down a little the where we set the velocity to 04:06.640 --> 04:14.180 zero where we can say in the x and y direction equally so come out towards us towards the viewer itself. 04:14.260 --> 04:20.850 We can set that I don't know at five and five and let's see what happens when we reset the frame. 04:20.860 --> 04:24.700 They're being thrown out this direction in fact because it's the same particle system that was a bit 04:24.700 --> 04:31.660 strong Let's go down to one and one or not five and one does one and one and reset and see what happens 04:31.690 --> 04:31.900 then. 04:31.900 --> 04:37.780 So they're being thrown out and then they're being sucked in and they'll probably orbit around this 04:38.110 --> 04:42.960 until well until they actually hit it or our animation runs out as we can see there. 04:42.970 --> 04:46.330 So that's now sucking them in towards this. 04:46.330 --> 04:47.050 So that's great. 04:47.050 --> 04:50.910 We can see that they don't affect each other's particles. 04:50.980 --> 04:55.110 However they do affect other particle systems. 04:55.210 --> 04:58.720 Now there are a couple of things that you can do. 04:58.750 --> 05:02.720 Say we didn't want this to happen but we wanted it to curve away anyway. 05:02.920 --> 05:10.090 We can set up our particular emitter and set up the forcefield separately and that's the second way 05:10.090 --> 05:12.390 of adding a force field to our models. 05:12.520 --> 05:16.330 Someone had the leave the other cube for the moment and were going to try and get the same thing going. 05:16.390 --> 05:21.970 But would just this individual one so selected it and I'm going to turn off the forcefield which because 05:21.970 --> 05:23.940 it's not doing anything for us. 05:24.070 --> 05:26.680 He's not changing the direction of these particles. 05:26.860 --> 05:31.320 However if we go ahead and add a force field. 05:31.510 --> 05:37.630 So that's the admen you just like you would add a new mesh object or curve etc.. 05:37.870 --> 05:42.450 We've got the option to have a forcefield and it will be added whether 3D cursor is. 05:42.460 --> 05:47.170 And because I haven't moved the 3D cursor it's going to appear smack bang in the middle of our cubes. 05:47.170 --> 05:49.180 Let's go ahead and add a forcefield. 05:49.210 --> 05:54.790 The same one again just a forcefield and that attracts so I'm going to go from minus one on this force 05:55.150 --> 06:01.690 and hopefully our hat so there's not enough ejection force this time round so in that case we're going 06:01.690 --> 06:03.730 to have to make it so would go back to the Q. 06:03.730 --> 06:05.410 Go back to the particle system. 06:05.530 --> 06:10.660 Scroll down to where we have the velocity I think I was actually there anyway so the velocity here is 06:10.660 --> 06:17.950 just being emitted in the it says x direction there that's just check this cube particle just 0 x and 06:17.950 --> 06:19.900 y I was misreading. 06:19.930 --> 06:23.640 So let's set it going off in the x and y direction. 06:23.650 --> 06:24.900 Let's set it up. 06:24.970 --> 06:25.900 Let's try five. 06:25.900 --> 06:28.470 This time it doesn't seem too strong. 06:28.840 --> 06:32.690 Okay so OK they're being chucked out quite a ways. 06:32.920 --> 06:37.390 But they will eventually come back as we can see this slowing down and starting to group and come back. 06:37.390 --> 06:39.790 So five was obviously still too strong. 06:39.790 --> 06:42.640 I'm going to try to leave it at that for the moment. 06:42.640 --> 06:48.460 So we've got this these particles being for south of the system and then being sucked back in which 06:48.460 --> 06:49.580 is pretty cool. 06:49.570 --> 06:50.010 There we go. 06:50.010 --> 06:51.060 They're coming back again. 06:51.190 --> 06:58.090 So that could be you know something being ejected from our model itself and in fact we can do in explode 06:58.090 --> 07:04.070 with those as well and have some sort of funky explosion going on unlike what's going on here so far. 07:04.150 --> 07:12.470 Now in order to make sure that this particular cube itself and the force feel the air that's within 07:12.490 --> 07:18.640 sort of the emission we need to make sure it kind of stays together and in which case we can literally 07:19.000 --> 07:20.800 we can see here it's a field. 07:20.800 --> 07:28.480 It's got the same symbol as an empty and we can drag that in to the cube and make it the parent of the 07:28.480 --> 07:28.810 cube. 07:28.810 --> 07:36.160 Then wherever we move the actual cube itself the simulation I suppose is still running from the same 07:36.160 --> 07:36.860 point. 07:37.000 --> 07:38.080 Brilliant. 07:38.110 --> 07:41.290 You can of course move them individually if you select individually. 07:41.290 --> 07:42.020 So I'm just going to. 07:42.070 --> 07:43.650 Undo those couple of moves. 07:43.780 --> 07:50.380 Okay so we're back at this point here what happens now if we have more than one of these because they 07:50.380 --> 07:53.860 are self affecting and they would affect others. 07:53.860 --> 08:00.910 So let's go ahead and duplicate that cube and pop one here one here and one here. 08:01.090 --> 08:04.150 We should start getting some interesting effects. 08:04.660 --> 08:09.200 Because these are all emitting However only one of them is attracting. 08:09.490 --> 08:15.670 So you can start to get some really interesting orbits going on or suctions or whatever you actually 08:15.670 --> 08:16.500 wanted to do. 08:16.510 --> 08:21.940 Of course we all know that these particles themselves can be changed to be objects as well so that could 08:21.940 --> 08:27.350 be a swarm of bees or whatever he wanted it to be swarming around that central cube. 08:27.580 --> 08:28.280 Okay. 08:28.330 --> 08:32.030 So armed with that knowledge I've got a quick challenge for you. 08:33.480 --> 08:37.920 Okay I would like you to go ahead and dissolve a cube. 08:38.190 --> 08:43.500 So set up a cube that will break in two blocks of pieces. 08:43.500 --> 08:49.680 I do recommend setting it up in a zero gravity environment initially just to get the hang of what's 08:49.680 --> 08:50.450 going on. 08:50.490 --> 08:56.160 If you have any gravity whatsoever things will just be poured southwards in negative z direction by 08:56.160 --> 08:56.800 default. 08:57.610 --> 09:02.130 Course if you go ahead and change the gravity to a different direction it will disappear in a different 09:02.130 --> 09:02.850 direction. 09:02.850 --> 09:10.800 So use a force field to break the cube up into little pieces as if it was be made out of fragile sand 09:10.800 --> 09:13.040 and it was just eroding away. 09:13.210 --> 09:15.650 Borzov video now and give that a go. 09:17.790 --> 09:19.140 Okay guys welcome back. 09:19.320 --> 09:22.660 Let's go dissolve a cube over in blender. 09:24.870 --> 09:27.780 Okay so this is where I left off here. 09:27.780 --> 09:31.470 This is where we've got some particles being emitted. 09:31.470 --> 09:35.520 Now we can use those particles obviously to dissolve cubes. 09:35.520 --> 09:41.460 Now we need the cube itself to be in multiple pieces and to make sure that I'm not repeating myself 09:41.460 --> 09:45.510 a you're going to use the scene I've got set up here because I think that would be quite interesting 09:45.840 --> 09:50.100 watching it being blown apart and then swirling around this central bets. 09:50.190 --> 09:56.830 I'm going to literally make sure all of these cubes have the same meshed data. 09:57.150 --> 09:59.780 So all of these are obviously different objects. 09:59.820 --> 10:03.310 Do they have all different mesh objects or mesh data. 10:03.330 --> 10:04.280 Yes they have. 10:04.320 --> 10:08.020 So I'm literally going to switch them all to just cube. 10:08.260 --> 10:10.930 So a bit of a time consuming thing but it's not going to take too long. 10:10.950 --> 10:12.980 There's not too many of them. 10:13.110 --> 10:16.410 Of course I could have just selected them all and made a link to them. 10:16.410 --> 10:21.090 So there's lots of ways of doing things in blender are chosen to do a little long handedly. 10:21.120 --> 10:21.730 Never mind. 10:21.870 --> 10:27.210 Okay so all of these are sharing the same mesh data which should mean if I go into that mesh data and 10:27.540 --> 10:29.410 subdivide I'm gone. 10:29.430 --> 10:35.240 Press Dubey there is term a keystrokes I'm going to press Dubie there and that subdivide and going to 10:35.240 --> 10:38.310 open a tall shelf and how many cuts are we going to do. 10:38.310 --> 10:43.440 Well bear in mind this is going to be multiplied by five times as well. 10:43.440 --> 10:47.170 I'm going to go for maybe 250 cuts. 10:47.610 --> 10:51.680 Well is that going to be too many might know though. 10:51.690 --> 10:52.360 That's tiny. 10:52.370 --> 10:52.960 Oh how. 10:53.030 --> 10:57.200 How many faces is this produced 61000. 10:57.200 --> 11:00.810 Yes that's going to be a bit too many that's going to slow down my computer something chronic. 11:00.810 --> 11:03.010 So let's try 15. 11:03.360 --> 11:04.590 Yeah that's a much better. 11:04.590 --> 11:06.250 Fifteen thousand faces. 11:06.410 --> 11:06.690 OK. 11:06.720 --> 11:08.170 So now I've done that. 11:08.310 --> 11:12.310 Every other one should also be 15000 faces. 11:12.310 --> 11:13.120 Sure. 11:13.230 --> 11:15.300 So we have got how many phases in total. 11:15.300 --> 11:16.350 Eighty thousand. 11:16.390 --> 11:16.540 OK. 11:16.560 --> 11:18.630 And these are all sharing the same set up. 11:18.780 --> 11:25.260 So we should have no trouble at all making all the settings to say some let's you can add the explode 11:25.290 --> 11:28.010 modifier to our first mesh here. 11:28.410 --> 11:29.610 Excellent. 11:29.610 --> 11:32.820 And a way it goes it's orbiting properly. 11:32.820 --> 11:33.470 Excellent. 11:33.630 --> 11:38.430 And it's it should be a matter now of adding the explode modifier to these other bits. 11:38.430 --> 11:42.840 So modifier explode modifier explode. 11:42.870 --> 11:49.890 Again I could make links across or it's starting to slow down now so perhaps I had a few too many. 11:49.980 --> 11:53.580 Anyway that's that's a good start isn't it. 11:53.580 --> 11:54.530 So there we go. 11:54.630 --> 11:54.960 Okay. 11:54.960 --> 12:00.060 Some may be too many there but we can see the cubes rule breaking apart and they're all in separate 12:00.060 --> 12:02.940 locations and they all start to orbit round. 12:02.940 --> 12:09.090 Now what I'm going to do is I'm actually going to let this run this animation itself for a little bit 12:09.090 --> 12:09.500 longer. 12:09.500 --> 12:15.450 Some gear up this and I will see you guys back in a few moments once I've left it cashed all this out 12:15.450 --> 12:18.810 and I'm going to render it out as well just to see what it looks like. 12:18.810 --> 12:23.760 Of course cinnamon make sure my details are low so I'm just going to pause it there and before I go 12:23.760 --> 12:27.390 off and disappear I would consider going to show you how I'm going to set this up. 12:27.510 --> 12:34.500 I'm going to go to the world properties and set a colour background to basically black so there's no 12:34.500 --> 12:38.700 ambient light in our scene and I'm just going to switch here over surrendered modes it's going to look 12:38.700 --> 12:39.440 like that. 12:39.570 --> 12:46.340 Now we've got this sort of bready colour I'm going to go in and pick something a little lighter. 12:46.350 --> 12:50.460 And of course I've got some materials here you can choose a different colour if you want it. 12:50.460 --> 12:55.000 I'm going to go from my terracotta colour mainly because I like fat. 12:55.050 --> 12:58.580 And then finally the light in the scene is all coming from a lamp. 12:59.430 --> 13:03.870 And at this point all of these pieces of course will self shadow one another. 13:04.070 --> 13:11.550 But if I go ahead here and we've got sunlamp with a setting of three let's set it a little higher. 13:11.850 --> 13:14.190 Okay that's five let's go for 10. 13:14.310 --> 13:14.570 Okay. 13:14.580 --> 13:16.500 That's getting some real highlights on it. 13:16.500 --> 13:20.000 Now let's zoom in and make sure it's real blowing out. 13:20.190 --> 13:22.010 Okay I like that as well. 13:22.020 --> 13:22.220 OK. 13:22.230 --> 13:29.790 A final thing I'm going to do which will tax my computer so I may end up leaving it a while to do the 13:29.790 --> 13:35.160 run in fact I'm probably going to do it on my P C which is a bit quicker than my laptop. 13:35.190 --> 13:41.700 I'm going to increase the number of particles for each one to the number of faces that are on each cube 13:41.700 --> 13:44.230 and if we remember there were something like 15000. 13:44.290 --> 13:50.640 That will give me a lot lot smaller set of particles and I'm going to run that simulation and hopefully 13:50.970 --> 13:56.760 get some sort of ring system going around my central point there. 13:56.940 --> 14:01.040 So I'll see you guys back in a few moments whilst I've sorted that out. 14:04.100 --> 14:06.980 Okay so things have changed not too dramatically. 14:06.980 --> 14:13.010 I've still got a load of cubes that are dissolving but I've replaced that middle one with a sphere and 14:13.010 --> 14:15.320 I've kind of got a young Saturn. 14:15.320 --> 14:16.790 How about that or something else. 14:16.790 --> 14:21.150 Like I have no planet with Square moons that have been broken up anyway. 14:21.290 --> 14:27.740 So this was super exciting to bake and when I was making it I was shocked to see the resources it took 14:27.740 --> 14:29.530 up so a word of warning. 14:29.600 --> 14:36.070 This particular blend file with all of the cache data for those particles and their movements because 14:36.070 --> 14:40.050 blend the stores that ballooned at 12 gigabytes. 14:40.130 --> 14:46.520 Not to mention that blender used well over twenty eight gigabytes worth of RAM when actually rendering 14:46.520 --> 14:53.510 this out now suffice to say if I was trying to run that on my GP you there was too much data for that 14:53.510 --> 14:55.570 to handle it just crashed out. 14:55.580 --> 15:00.530 So this is the sort of thing that if you start getting lots and lots of particles you are going to suffer 15:00.890 --> 15:08.350 ram issues vs ram issues even on modest cards like a titan X or something crazy like that. 15:08.360 --> 15:10.900 It's got 12 gigabytes of RAM cost thousands. 15:10.970 --> 15:15.980 So in this case a s.p. you would be the best place to render this on as you can see. 15:15.980 --> 15:18.120 This was lots of fun to make. 15:18.230 --> 15:23.270 I hope you guys have made some similarly wacky dissolving of the cubes. 15:23.270 --> 15:28.490 Oh so you've gone remember to share that work over on the forums so we can all see it and I will see 15:28.490 --> 15:30.910 you guys in the next lecture.