WEBVTT 00:00.180 --> 00:07.020 In this lesson, we're going to take the INM that we've used and create smoke, so let's go to Cash 00:07.020 --> 00:14.790 Alembic, Cash, import Alembic and we'll use the Bifrost ATM here and I'll import now, if you remember 00:15.180 --> 00:21.930 the tourists here and we can rename this to INM if we like, call it smoke. 00:23.970 --> 00:28.770 It's probably pretty small, but now that it's an Olympic cache, we can scale it and it's going to 00:28.770 --> 00:31.140 maintain this shape. 00:31.140 --> 00:36.600 You can remember when we are scaling it in the previous lesson that it was changing because the shape 00:36.600 --> 00:38.820 was moving through the texture. 00:38.820 --> 00:44.130 But now we can scale down to zero if we want to check that out or before we can scale down the zero. 00:44.130 --> 00:46.620 So that's why we need to do an Olympic cache. 00:47.190 --> 00:52.920 So now that we have this, we can place this where we need it and we're going to scale it up. 00:53.710 --> 01:01.530 So let's bring it over to basically where what I what I want to have happen is the smoke to pop out 01:01.560 --> 01:10.140 when the hand comes through and then we can do it again when the guy busts out. 01:10.470 --> 01:12.660 So it'll be two times that we're going to use this. 01:13.020 --> 01:19.140 And if you notice, when I'm scrubbing through here, the the texture reformer or all that animation 01:19.140 --> 01:22.200 that we had is not actually going through. 01:22.560 --> 01:25.960 So what we can do is offset the Olympic cache. 01:25.960 --> 01:32.670 So let's go into the attribute editor and go over to the Olympic node and we can offset this by one 01:32.670 --> 01:33.240 thousand. 01:33.930 --> 01:40.860 And so now when we scrub through, we should be able to see that it is indeed moving as we expect it 01:40.860 --> 01:41.120 to. 01:41.640 --> 01:45.240 So let's get this thing kind of where we want it. 01:47.460 --> 01:50.600 Let's get under the ground here. 01:50.610 --> 01:53.370 Let's go back to frame here ish. 01:53.460 --> 02:03.300 So now we can kind of see it is under the ground that we've created and then we need to figure out what 02:03.300 --> 02:06.280 frame that the animation starts. 02:06.300 --> 02:15.000 So let's go to frame ten twenty, I believe, and let's scale this to zero so that it starts basically 02:15.000 --> 02:15.510 off. 02:16.200 --> 02:25.230 I will kiss like that and then I'm going to go to frame ten, twenty three so pretty quick and is going 02:25.230 --> 02:28.080 to turn on oops. 02:28.830 --> 02:34.770 Command at the wrong arrow button there you can see I'm typing up here. 02:35.100 --> 02:38.820 So to get off of that I usually just select somewhere in the viewport or something. 02:39.360 --> 02:41.070 So now we're on frame ten, twenty three. 02:41.070 --> 02:50.970 So let's scale this back up to the size that we want it just type in a number here and then scale it. 02:51.330 --> 02:55.200 I don't want it to be touching the top here because we're going to choose a couple of these pieces for 02:55.200 --> 02:58.650 it to collide with and I don't want it to be intersecting that. 02:59.010 --> 03:03.210 So I'm just going to choose something that is not intersecting that. 03:03.840 --> 03:08.430 And I'm also going to bring this timeline down because we're not having to do pre roll for this. 03:08.430 --> 03:16.530 So because it's happening kind of after the the scenes are going anyways and then I'm going to go to 03:16.530 --> 03:25.950 ten thirty one and had a keyframe on his shift ared only keyframe the scale and then go to ten thirty 03:25.950 --> 03:30.390 seven ish and scale that back down to zero. 03:30.750 --> 03:33.810 So scaling to is basically going to turn the emitter off. 03:34.410 --> 03:45.360 And so now we have this kind of effect where the emitter pops on at the same time that the explosion 03:45.360 --> 03:46.560 happens here with his fist. 03:49.680 --> 03:55.200 And because we haven't quite framed the position, we can kind of move this without having to worry 03:55.200 --> 03:58.590 about, you know, affecting keyframes negatively. 04:00.330 --> 04:02.070 And I'm going to go back to the beginning. 04:02.070 --> 04:05.570 Just make sure I want to kind of max out the scale here. 04:05.610 --> 04:08.040 So it looks like that's pretty good. 04:08.870 --> 04:11.790 I might just move this down a little bit so I can scale it. 04:14.810 --> 04:19.670 And the scale it up a little more here. 04:23.180 --> 04:31.340 Cool, now that we have the INM done, we can add the Bifrost, so let's go to the effects tab and go 04:31.340 --> 04:33.310 Bifrost Fluid's Arrow. 04:33.320 --> 04:35.840 So last time we did Liquid, this time we're going to do Arrow. 04:36.260 --> 04:38.840 So let's click that with the SM selected. 04:39.320 --> 04:44.490 So now we get all of these kind of things were somewhat familiar with last time we did liquid. 04:44.510 --> 04:46.180 Now we're doing arrow or smoke. 04:46.670 --> 04:50.060 So it's a little bit different in the other main difference. 04:50.940 --> 04:55.290 We want to keep in mind as scale again, something we keep coming back to. 04:55.670 --> 05:05.390 So in our liquid example, the scale was we created our scene to fit the Bifrost scale. 05:05.840 --> 05:08.630 But in this case, our scale is pretty huge. 05:08.900 --> 05:13.930 And so we need to adjust Bifrost to fit our scene instead of the other way around, which we did in 05:13.950 --> 05:14.350 liquid. 05:14.660 --> 05:18.950 So to do that, we need to adjust the dynamic properties. 05:18.950 --> 05:22.850 So gravity kind of what we did in the bullet solver stuff, we just need to do that here. 05:23.300 --> 05:25.220 So we'll get to that here in a second. 05:25.220 --> 05:33.620 But I'm going to hit the start frame, let's say, 10, 20, because that's where our animation starts 05:33.620 --> 05:36.380 for the INM and turn on scratch cash. 05:36.820 --> 05:43.610 I'm going to go over to the arrow shape on a turn voxels so we can basically shows the smoke a little 05:43.610 --> 05:44.090 bit better. 05:44.630 --> 05:46.910 And I think that's all we wanted to do. 05:46.910 --> 05:50.150 And that tab going to go to the next tab. 05:51.760 --> 06:00.320 And that's not what we want someone to go to the ATM and I want to turn up the temperature. 06:00.770 --> 06:06.800 So this is kind of another thing back to scale and also just how I want this to kind of float up. 06:06.800 --> 06:09.870 Temperature is going to affect how quick this rises. 06:10.130 --> 06:12.260 So just imagine like a fire or something. 06:12.260 --> 06:18.520 The hotter is, you know, maybe the the faster the smoke or the fire is going to go upward. 06:18.890 --> 06:20.570 So it's going to change that to fifteen hundred. 06:21.800 --> 06:28.280 And then I'm going to go to the Arrow tab over here, back to that. 06:28.280 --> 06:31.190 And yeah, I've got voxel selected already. 06:31.490 --> 06:37.370 So then I'm going to go to properties and scroll down properties. 06:37.520 --> 06:40.670 And of course it's kind of deceiving this property. 06:40.670 --> 06:44.260 Tab's you think it has nothing on it and then you scroll it down, has a million things here. 06:45.170 --> 06:47.580 So this is where the scale factors. 06:47.580 --> 06:51.620 Then, if you remember on the bullet solver, we did the same thing, which can increase the nine hundred 06:51.620 --> 06:52.010 and eighty. 06:52.790 --> 06:59.990 That's basically, you know, taking the centimeter to meter scale and then multiplying it by that the 06:59.990 --> 07:01.190 master voxel size. 07:01.190 --> 07:04.360 OK, this is where you can get into a ton of trouble. 07:04.760 --> 07:07.730 We talked about a little bit last time about the liquid. 07:08.480 --> 07:11.840 But here for this lesson, I'm never going to go below this. 07:12.080 --> 07:14.000 Below means higher resolution. 07:14.000 --> 07:19.880 If I take this number down for us, I want to keep this pretty high so we can actually see the simulation. 07:20.360 --> 07:26.450 And also another little trick when the scratch cache, when you're testing stuff and you hit play and 07:26.450 --> 07:30.740 the scratch cache isn't working or isn't letting you stop it. 07:31.790 --> 07:36.260 So imagine, you know, it's taking like one minute per frame to calculate. 07:36.740 --> 07:42.940 And you you know, here we already have the green stuff popping up from the scratch cache and that's 07:43.040 --> 07:46.280 just taking one minute perforin to calculate and you can't cancel it. 07:46.730 --> 07:48.830 You're like, OK, I don't like the way this is going. 07:48.830 --> 07:49.610 Let me cancel. 07:50.380 --> 07:53.390 You've got like two hundred more frames or it's going to be like ours. 07:53.810 --> 08:01.820 So again, this is why you want to turn on playback one and you want to scale down what you're actually 08:01.820 --> 08:06.070 viewing so that it doesn't go past where you want it to. 08:06.500 --> 08:13.100 And the other little trick I found is if you're hitting escape and it's not working to stop playback, 08:13.460 --> 08:17.390 if you switch to another window, at least this is maybe it's a Mac thing. 08:17.600 --> 08:22.130 If you switch to another window and then switch back to my and then hit escape, it'll kind of recognize 08:22.130 --> 08:25.430 that you were hitting a keystroke in the my window. 08:25.790 --> 08:33.880 But for some reason, if I hit escape sometimes with Maya, you know, it won't it won't recognize it. 08:33.890 --> 08:39.320 So I got to go, you know, go to Chrom or some browser window or find or something and then jump back 08:39.320 --> 08:42.680 into Maya and then it'll accept any keystroke like escape. 08:43.140 --> 08:45.050 So anyway, that's something to remember. 08:45.080 --> 08:48.260 So so Masroor Boxercise, we're familiar with that now. 08:48.930 --> 08:52.100 I want to keep this kind of higher so that we can actually test things. 08:52.100 --> 08:56.240 The idea is you want to test at a very low resolution and low. 08:56.240 --> 08:56.660 Does it mean. 08:56.660 --> 09:00.980 No, actually means a high number for voxel size because you think about what this is. 09:01.310 --> 09:04.250 It's, you know, the the three dimensional pixel. 09:04.250 --> 09:09.500 So we want a bigger one because we wanted to represent a bigger area per pixel per voxel. 09:09.950 --> 09:14.540 And so we want this to be a bigger number, which will mean lower resolution. 09:14.900 --> 09:17.480 And that's how we want to test our smoke. 09:17.810 --> 09:22.520 And then once we like it, we can decrease the voxel size and then. 09:22.690 --> 09:28.960 Hash it out so it'll have a lot finer detail, but let me tell you just real quick, this might break 09:28.960 --> 09:29.910 your all's machines. 09:29.920 --> 09:31.920 I don't know what kind of computer you're working with. 09:32.350 --> 09:37.180 This is the stuff that's very, very, very, very computer intensive, especially if you have this 09:37.180 --> 09:46.270 voxel size set, too small and too much of a high resolution instead of at a higher number and a lower 09:46.270 --> 09:46.920 resolution. 09:47.380 --> 09:51.730 So we want to keep this at one point five, at least for this scene scale. 09:52.000 --> 09:53.070 It seems to work pretty well. 09:53.590 --> 09:56.120 So let's just hit play and see what we get. 09:57.160 --> 10:04.180 So now that we have this simulated, we can take a look at the shape of the smoke and you can tell it's 10:04.180 --> 10:11.830 very kind of uniform bulb, like very rounded and it doesn't look super supernatural. 10:12.220 --> 10:16.420 So we can affect that with a turbulence field. 10:16.870 --> 10:19.440 And Bifrost kind of has their own thing. 10:19.660 --> 10:27.400 So with it selected, we can go to Bifrost fluids and it has its own you know, you can find turbulence 10:27.400 --> 10:28.530 field under the motion field. 10:28.540 --> 10:32.830 So this is where you're going to want to go if you want to add some noise. 10:33.220 --> 10:34.570 So I'm going to click motion field. 10:35.050 --> 10:40.900 And now we have all these different options to affect the Bifrost simulation. 10:41.170 --> 10:44.530 So I'm going to turn off direction and I'm going to turn on a little bit of drag. 10:44.770 --> 10:50.170 That just means it's going to kind of have resistance to whatever motion is going on. 10:50.930 --> 10:55.000 And of course, that's kind of a physically accurate thing in nature. 10:55.000 --> 10:57.850 That's what happens when I turn on turbulence. 10:57.850 --> 11:04.720 And because the scale of our scene, I'm going to crank these way up, I must say something like 5000. 11:05.650 --> 11:12.640 So these numbers will be different every time, depending on your scene and how you want to affect the 11:12.640 --> 11:13.450 simulation. 11:13.840 --> 11:20.410 So I'm going to remember this on frame ten, thirty five and I'm going to redo the scratch cash up to 11:20.410 --> 11:26.950 this frame and see if we can't break up this very rounded look and make it a little more disturbed and 11:26.950 --> 11:31.270 wispy and more smoke like instead of like this kind of rounded look. 11:31.270 --> 11:32.200 So I'll see you in one second. 11:38.260 --> 11:43.210 So now that our scratch caches is done there, we can take a look at frame ten, thirty five and I did 11:43.210 --> 11:45.850 a little screen shot here so that we could compare. 11:46.120 --> 11:48.370 Take a look at this section here. 11:49.000 --> 11:53.580 Now, on this section, you can see there's a lot more bumps to it, right. 11:53.600 --> 11:55.450 How this was totally smooth. 11:55.660 --> 11:58.750 And now you can see a lot more texture here internally. 11:58.960 --> 12:02.410 There's all these little bumps and then different things going on. 12:02.740 --> 12:05.700 And then same thing with back here. 12:06.010 --> 12:08.710 This was just one big kind of mushroom cloud. 12:08.950 --> 12:11.560 And now there's a little more texture to it here. 12:11.800 --> 12:13.910 And so it'll just add to the believability. 12:14.260 --> 12:19.630 So the next thing we can do to add to that believability is to add colliders so that the smoke will 12:19.630 --> 12:22.360 have to wrap around things and flow around different things. 12:22.720 --> 12:28.900 So let's choose a couple of pieces in here to add as a collider so that it'll add some believability 12:28.900 --> 12:31.120 and dynamic kind of interaction to it. 12:31.600 --> 12:39.670 So I'm going to select the Bifrost arrow in the outliner and then I'm going to go in here and click 12:40.480 --> 12:42.850 shift, click on a couple of pieces here. 12:43.690 --> 12:48.910 When I choose some of the big ones that are going to be kind of in the main kind of area, that's going 12:48.910 --> 12:50.460 to block the smoke coming up. 12:50.470 --> 12:51.640 So it'll have to go around it. 12:51.970 --> 12:54.790 So I can go to Bifrost Fluid's ad collider. 12:55.300 --> 13:00.370 Then I'm going to select the Bifrost Arrow again and just do that another time here. 13:01.270 --> 13:05.110 Just going to select this big piece and choose Add Collider. 13:05.980 --> 13:13.570 And I choose the Bifrost simulation again and choose this big piece and say add collider. 13:14.470 --> 13:19.750 And of course, every time we're doing this, this is going to increase the computational kind of time 13:20.140 --> 13:27.490 that it's going to take to simulate, but it's going to add a lot of believability of it interacting 13:27.490 --> 13:28.510 with the scene here. 13:28.960 --> 13:35.110 So I'm not going to choose every little piece that's in the way, but I just wanted a couple. 13:35.110 --> 13:42.090 So it'll give kind of the effect of of being affected by the scene and the pieces here. 13:42.520 --> 13:45.340 So I think I'm just going to choose maybe that one. 13:46.210 --> 13:47.520 It's going to be the last one. 13:47.920 --> 13:50.740 And of course, you go crazy and choose all of these if you wanted. 13:50.740 --> 13:56.440 But I think it will be an education and learning the limitations of your computer. 13:57.400 --> 14:04.780 So I'm going to do a scratch cache again and then we can compare again with what we've seen already. 14:09.860 --> 14:15.620 OK, now let's take a look at what we've created here now that we've added a few colliders, it's really 14:15.620 --> 14:17.720 changing the look of the smoke. 14:17.840 --> 14:20.200 Let's take a look at our screen shot here. 14:20.210 --> 14:24.070 Now, you can really see it's almost totally different now, you know. 14:24.140 --> 14:28.250 Let's see if I can't get in a similar camera position here. 14:28.700 --> 14:30.560 I think I was maybe down a little bit. 14:33.620 --> 14:34.610 And in general. 14:36.610 --> 14:42.220 I think this thing, it's just not getting as high as fast, you know, here you can see it's already 14:42.220 --> 14:45.190 up to the point of the flags and here it's definitely not reached there yet. 14:45.490 --> 14:49.510 So it's it's kind of creating all this drag and it's changing the shape of it here. 14:49.870 --> 14:52.510 And look just how much more jagged these edges are. 14:52.750 --> 14:55.000 Everything is much more organic looking. 14:55.000 --> 15:00.000 And it just it just looks a lot better than this kind of very, very simple shape of this smoke. 15:00.370 --> 15:06.060 So adding colliders, adding emotion field is really going to change the look of the smoke. 15:06.580 --> 15:15.070 So now that we see that our smoke is looking pretty good, let's create one more simulation when he 15:15.070 --> 15:15.930 busts out. 15:16.240 --> 15:18.580 So when I scrub, I don't want to try to be calculating. 15:18.580 --> 15:23.560 So I'm just going to disable the kind of a Bifrost Arrow container here. 15:23.560 --> 15:25.060 So it's not going to simulate. 15:25.060 --> 15:28.570 So now I can scrub and you can see the green stuff isn't trying to catch up. 15:29.020 --> 15:36.610 So I'm going to grab the emitter smoke and I'm just going to go to frame 11 09 here. 15:37.970 --> 15:43.610 So I'm going to drag this back out and I think this is going to be the first frame here, so I'm going 15:43.610 --> 15:45.800 to copy paste these. 15:45.800 --> 15:49.970 I'm going to shift drag select copy the key frames here. 15:49.970 --> 15:55.310 I'm going to go to something like 11 09, I think, and then paste. 15:56.810 --> 15:59.600 And then we should be getting. 16:00.600 --> 16:07.740 The ammeter coming back on now might move that in time just a little bit, because I want what we're 16:07.740 --> 16:12.740 going to do is create his head and his vest as an emitter, sorry, as a collider. 16:13.020 --> 16:17.640 So we want the head to go straight through the emitter. 16:19.010 --> 16:28.400 And in so doing, it will take a lot of smoke with it, so one option would be you could just make the 16:28.400 --> 16:29.070 head in a minute. 16:29.090 --> 16:34.730 But what you're going to get is it's going to be emitting from the volume of this thing. 16:34.730 --> 16:42.230 So you won't you there'll be smoke in the front of the head as opposed to like kind of the head pushing 16:42.230 --> 16:48.080 through smoke so that the way we're going to do it is use the head as a collider. 16:48.080 --> 16:49.720 So it's going to be pushing through smoke. 16:50.030 --> 16:54.110 Another way could be to create the head as an emitter. 16:54.110 --> 16:59.300 But I think that is going to look too wonky and it would actually be way more time intensive. 17:00.260 --> 17:02.980 So instead, we're going to create this is a collider. 17:03.260 --> 17:08.510 So we want to make sure that it's actually going through the emitter so that it can drag some of the 17:08.510 --> 17:10.370 smoke with it as it's coming through. 17:11.060 --> 17:19.100 So let's just click the emitter again and see if we can probably just turn off the smoke here a lot 17:19.100 --> 17:19.660 sooner. 17:19.910 --> 17:21.500 So I'm going to bring down these. 17:24.560 --> 17:25.430 KeyFrames. 17:27.680 --> 17:32.930 So that looks pretty good, so now we just need to add the head and the vest as a glider, so with the 17:32.930 --> 17:38.540 Bifrost are selected, the head selected, I'm going to say Cleide and then do the same thing for the 17:38.540 --> 17:43.460 vest just because these are kind of the two biggest pieces of his body that are passing through. 17:43.800 --> 17:47.420 And we don't want to go overboard just like every single bone. 17:47.780 --> 17:51.200 And that would take forever for it to collide. 17:51.440 --> 17:56.570 So we just want to stick to the big pieces that are going to be most noticeable and now we can cash 17:56.570 --> 17:57.050 this out. 17:57.500 --> 17:58.890 So how you cash it out? 17:59.810 --> 18:02.060 Let's get this thing all the way to the time. 18:02.060 --> 18:02.620 Slider here. 18:02.870 --> 18:05.270 We want to turn off scratch cash. 18:05.300 --> 18:08.780 OK, let's enable the simulation again. 18:09.020 --> 18:10.580 Let's go back to frame one on one. 18:11.030 --> 18:16.490 And we want to turn off scratch cash because we don't want to cash to disk, meaning saving it to your 18:16.490 --> 18:17.090 computer. 18:17.630 --> 18:22.760 And this, which is the cash, cash and scratch cash, meaning kind of temporary. 18:22.760 --> 18:23.300 We don't. 18:23.300 --> 18:24.500 And that happens on memory. 18:24.500 --> 18:28.340 So we don't want them happening at the same time that your computer will blow up. 18:28.340 --> 18:29.730 So it won't blow up. 18:29.730 --> 18:37.640 But, you know, I mean, you can turn off scratch cashier and then you can also it should already get 18:37.640 --> 18:38.150 rid of it. 18:38.150 --> 18:42.680 But if not, you're going to Bifrost fluids and say flush scratch cash. 18:42.680 --> 18:44.540 So it'll get everything out of the memory. 18:45.050 --> 18:47.850 And now we can focus on just the caching to disk. 18:47.870 --> 18:53.210 OK, so open up Bifrost fluids, go to the option box here and we can set all of this stuff. 18:53.210 --> 18:58.580 And if you have your project set properly, this should be, you know, looks similar. 18:58.580 --> 18:59.960 It should be in the cache folder. 18:59.960 --> 19:02.360 It's already populating that for you. 19:03.080 --> 19:07.550 And now we can call this ground smoke. 19:08.120 --> 19:13.670 And I'm going to say, oh, one, just in case I want to do it. 19:13.670 --> 19:17.120 Another simulation later when I say time, slider. 19:17.150 --> 19:22.340 And so I may hit create and. 19:24.220 --> 19:25.660 It should run through. 19:27.410 --> 19:33.620 And create the simulation, but what I found in this could just be my version of Maya is it doesn't 19:33.620 --> 19:33.980 do that, 19:37.070 --> 19:38.870 but it does set up the file structure. 19:39.200 --> 19:46.190 So we can just use that window here, use this to set up the file structure so that when we go into 19:46.190 --> 19:51.800 the Bifrost caching, it'll already be set up. 19:52.860 --> 19:56.450 So let's go down to zero cache here. 19:56.450 --> 19:59.330 You can see it's this little tab under the properties. 19:59.330 --> 20:00.640 So have properties selected. 20:01.010 --> 20:04.850 I'm down here and an arrow cache. 20:05.420 --> 20:10.510 And also I found it's nice to set the air temperature kind of higher, too. 20:10.790 --> 20:14.210 So all the air around the smoke is also going up. 20:14.480 --> 20:16.520 So I'm going to add a zero here to temperature. 20:16.940 --> 20:22.330 And let's see, I'm also going to have the smoke dissipate. 20:22.790 --> 20:29.480 So this says how fast the smoke disappears, essentially to add a zero to that, too. 20:29.720 --> 20:33.560 And I'm also going to randomize the velocity, which is very nice to. 20:33.560 --> 20:41.120 It'll also add some texture and noise so that the velocity of the voxels and smoke emitting is going 20:41.120 --> 20:42.640 to be randomise a little bit. 20:42.890 --> 20:47.690 So I'm just going to add like a one here, you could do 10, you know, just play around with these 20:47.690 --> 20:48.140 numbers. 20:49.730 --> 20:52.850 It really depends on your scale and the look you're going for. 20:53.150 --> 21:03.920 And this is why it's really important to, again, work with the lowest master voxel size resolution, 21:03.920 --> 21:05.720 lowest resolution, meaning high. 21:05.720 --> 21:13.550 No work with that as much as you can because it'll allow you to iterate very quickly so you can play 21:13.550 --> 21:19.100 with these numbers, do another scratch cache, but keep this number high, meaning the resolution low 21:19.100 --> 21:20.240 so you can play with this stuff. 21:20.600 --> 21:26.480 So because we're caching, I'm going to maybe take this down, you know, whatever, a little bit, 21:26.780 --> 21:29.090 you know, one point three this time instead of one point five. 21:29.300 --> 21:31.970 So we'll just get a little more detail and the cache. 21:32.360 --> 21:38.840 And so because we already did the arrow cache thing from this menu here, compute and cash to disk, 21:39.200 --> 21:41.630 this set up all the file structure here. 21:42.050 --> 21:45.290 But technically, it's supposed to run the the cache. 21:45.590 --> 21:51.560 You can see we have a blue mark here now and the blue means cache to disk. 21:51.560 --> 21:53.450 The green means scratch cache. 21:53.780 --> 22:00.320 So it tried to cash the disk here, but yeah, it didn't do it. 22:00.320 --> 22:02.380 So we need to run it again. 22:02.420 --> 22:06.560 So the main thing to notice here is cache control. 22:07.010 --> 22:09.440 There's a number corresponding to each one of these. 22:09.770 --> 22:15.170 So let me show you it in the documentation cache control zero. 22:15.370 --> 22:23.000 Recompute the simulation, OK, one which is already set to reads cached frames because we clicked it, 22:23.000 --> 22:24.740 it thought, you know, a cached it. 22:24.740 --> 22:29.270 So now it's going to read what a cache but only cache this one frame we can see that's blue over here 22:29.630 --> 22:32.330 and if we hit play, it's not going to actually cache anything. 22:32.330 --> 22:35.080 So we need to change this number to two. 22:35.480 --> 22:38.240 It says creates user files for each frame. 22:38.270 --> 22:39.050 That's what we want. 22:39.050 --> 22:44.930 We want to create when we're done creating the simulation, we want to turn it back to one so that every 22:44.930 --> 22:49.910 time we're playing back, it's not overriding our cash and rehashing for no reason. 22:49.910 --> 22:50.210 Right. 22:50.510 --> 22:52.400 So we want to do this on two. 22:52.880 --> 22:54.290 So we'll set it to two over here. 22:54.290 --> 23:00.380 So it'll actually write and cache this out when we hit play on the play back button here. 23:00.770 --> 23:07.250 And after it's done, we can turn this back to one and it's going to read the cache files from this 23:07.250 --> 23:08.420 location that we've set. 23:08.570 --> 23:11.090 So I'm going to hit play and it's going to start caching. 23:11.090 --> 23:12.220 And I'll see you here in a second. 23:12.380 --> 23:12.800 Thanks.