WEBVTT 00:00.210 --> 00:03.920 Welcome to using objects with particle systems. 00:04.110 --> 00:11.100 In this video you will learn how you can place hundreds of objects easily and fluidly using the particle 00:11.100 --> 00:12.050 system. 00:12.090 --> 00:18.030 We're going to control the distribution of particles using the weight painting and virtex groups and 00:18.030 --> 00:21.310 turn off outlines when they start to clutter the view. 00:21.750 --> 00:24.440 So let's hop straight on over into blender. 00:25.290 --> 00:30.290 Okay so we'll start off with the outlines in fact since we've got some good examples in front. 00:30.300 --> 00:35.050 Now if you followed through on the last challenge you'll notice I turn them on and off. 00:35.070 --> 00:40.500 So this is where I officially after the event of course tell you about the outline so when you start 00:40.500 --> 00:47.430 to have hundreds of these in our scene it's going to be quite difficult to actually see what's going 00:47.490 --> 00:47.910 on. 00:47.910 --> 00:55.950 If I get very cluttered very quickly now in the propertys pain the nke on the 3D view when you scroll 00:55.950 --> 01:02.810 down there will be an option for display and sometimes it's toggled in or out but there's simply a checkbox 01:02.880 --> 01:08.850 here that you can use outlines selected or not and you can see straightaway that it's great to be able 01:08.850 --> 01:12.170 to see what's actually going on and how it looks. 01:12.180 --> 01:18.990 Now the other thing that I noticed as I was working on this is that this model itself is quite high 01:18.990 --> 01:20.230 in its polygon count. 01:20.370 --> 01:26.250 So let's see if we can sort that out before we start putting hundreds of them into our scene. 01:26.370 --> 01:32.130 So let's have a look at the modifiers here and I'm going to use the decimate modifier similar to how 01:32.130 --> 01:36.760 we made our low poly porn over in the chest section. 01:36.780 --> 01:44.400 Now when we use unsub divide for this one and we can see I've got 259 faces and if I turn on the outline 01:44.400 --> 01:49.900 again we can see that most of them are on these small blades of grass crisscrossing one another. 01:49.930 --> 01:54.840 Some I'm going to increase these iterations and it looks like the lowest number of faces I can get is 01:54.840 --> 01:56.710 around five iterations. 01:56.730 --> 01:57.040 Yeah. 01:57.270 --> 02:00.040 And 23 faces interestingly. 02:00.930 --> 02:03.370 You get less number four. 02:03.510 --> 02:04.080 Okay. 02:04.200 --> 02:05.710 So let's see what it looks like number four. 02:05.710 --> 02:08.490 Again I'm going to have to turn the outlying isolated off. 02:08.530 --> 02:13.970 Now if I was really close to the grass would I notice that. 02:14.160 --> 02:14.880 Maybe not. 02:14.880 --> 02:18.970 Now it gets a bit funny here it goes a bit wobbly. 02:19.140 --> 02:23.100 Let's see how it looks at three and it's a tiny bit smoother. 02:23.100 --> 02:28.770 I think we can actually get away with it at four houses were very rarely going to be this close to the 02:28.770 --> 02:34.260 grass and if we are going to be lots of other grass around as well that's going to disguise any of these 02:34.980 --> 02:37.880 nooks and crannies and kinks in the blades of grass. 02:38.010 --> 02:43.650 So I'm going to do that and apply my decimate so I've dropped this massively down from the number of 02:43.660 --> 02:48.150 faces it had and obviously the number of triangles it had as well. 02:48.150 --> 02:49.900 Much much neater. 02:50.010 --> 02:54.000 So let's play about with adding objects into a scene. 02:54.000 --> 03:00.120 Now in order to do that I'm first going to save my file and I'm going to demonstrate the whole object 03:00.150 --> 03:06.480 putting into a scene not in our bunny scene at the moment so I'm going to go ahead and open up a new 03:06.480 --> 03:10.150 file and reload the start up file. 03:10.260 --> 03:14.090 So let's go ahead and play with our cube here. 03:14.090 --> 03:20.940 I'm going to move it to one side and I'm going to create a cone so we're going to have a cone and Cube 03:21.570 --> 03:26.640 as our two objects that we're going to play with and use the particle system on. 03:26.700 --> 03:34.530 Now I'm going to select both of them and put them on Lay five let's say So they're just out of the way. 03:34.620 --> 03:39.590 Whoops I've just moved to layer five rather than moved them to layer 5. 03:39.600 --> 03:40.780 But let's work on left. 03:40.870 --> 03:41.690 Anyway. 03:42.060 --> 03:47.130 And that's what you'll probably want to do with most of the objects that you want to use with any particle 03:47.130 --> 03:51.840 system move them to their own separate layer so they're just out of the way and you can turn them on 03:51.840 --> 03:53.860 and off really quickly. 03:54.100 --> 03:54.320 Right. 03:54.330 --> 03:56.570 I'm going to add a ground plane. 03:58.130 --> 03:59.140 That were going to work with. 03:59.150 --> 04:05.780 I'm just going to scale it up and probably just subdivide it a couple of times or hop into edit mode 04:06.230 --> 04:12.350 and subdivide and I'll just make it a little bit uneven as well that's probably a bit too much geometry 04:12.380 --> 04:15.050 but it will do for this example them. 04:15.070 --> 04:16.400 Paul that's up there. 04:16.400 --> 04:23.900 Spread it out and make a big hill there so we can watch things go over and I'm going to make a less 04:23.900 --> 04:24.660 of a big hill though. 04:24.670 --> 04:31.100 I'm just going to play about and you can obviously make your touraine how you want to make it so that 04:31.100 --> 04:32.900 looks pretty good for the moment. 04:32.900 --> 04:35.810 For our example I don't wanna hate. 04:35.840 --> 04:37.870 Wrong one Swan and move it down. 04:37.910 --> 04:42.650 No we get so lots of lots of geometry going on there a lovely smooth train. 04:42.640 --> 04:46.740 In fact it only will be smooth if I turn on smooth shading. 04:46.760 --> 04:52.060 So there we go we've got a basic train that now we can start putting our mesh objects on. 04:52.070 --> 04:57.750 So let's start by adding a particle effect to this ground plane. 04:57.830 --> 05:01.460 So I'm going to click on the particle's option here and create a new particle system. 05:01.460 --> 05:06.080 I am going to start with the cones because it is important that I show you something that happens with 05:06.110 --> 05:06.970 objects. 05:06.980 --> 05:14.850 It may not happen with your textures since textures have y as facing up the particle systems also have. 05:14.870 --> 05:16.410 Why is facing up. 05:16.520 --> 05:18.500 So let's go ahead and create cones. 05:18.500 --> 05:25.040 I'm going to call this one Cone's as well so we know when we can borrow it in a bit to apply it to our 05:25.040 --> 05:31.220 cubes as well but we're going to set up one first of all it's going to be of type hairs and we can see 05:31.250 --> 05:32.510 the hairs now growing out now. 05:32.510 --> 05:35.740 We can replace those hairs with objects. 05:35.750 --> 05:41.540 Now I know with the size of Cuban probably going to have to turn down the number that we have some just 05:41.540 --> 05:43.250 going to turn it down to maybe 50. 05:43.250 --> 05:43.850 For the moment. 05:43.850 --> 05:46.410 And that also keeps our viewport nice and quick. 05:46.430 --> 05:48.620 We can always change this later. 05:48.620 --> 05:56.360 Now the hair length when dealing with objects you'll probably want to set the hair length to one and 05:56.360 --> 05:59.640 then scrolling down under. 05:59.780 --> 06:07.970 All Where is it hidden under objects so we select objects and the size here set that as one. 06:08.000 --> 06:11.890 Now when that's one and this hair length here is one. 06:12.020 --> 06:18.710 Your object will be the size that you created it rather than some random size in between. 06:18.780 --> 06:23.300 That's always very useful for making sure that the scene is laid out as you were expecting it. 06:23.310 --> 06:27.230 It's caught me out no end when I've not set these two to one obviously. 06:27.320 --> 06:32.000 Feel free to change them afterwards to your heart's content but that's a very good starting point. 06:32.030 --> 06:34.010 So now the object is selected. 06:34.100 --> 06:39.470 We can go in cool actually going collect or go and pick the cone. 06:40.100 --> 06:46.030 So it was pointing up on this layer here and on layer 5. 06:46.040 --> 06:51.380 It's not it's O K or it looks like I haven't moved my justice. 06:51.380 --> 06:54.320 I went to layer 5 a month press m and then moved to there 5. 06:54.340 --> 06:55.530 Never mind. 06:55.670 --> 06:58.220 But here we have a problem. 06:58.220 --> 07:01.370 They're all laying on their side and we don't want that. 07:01.370 --> 07:07.720 And that's because why is up as far as the particle system is concerned. 07:07.820 --> 07:15.100 So we all we simply need to do is rotate our original cube around so we can enable both of the layers. 07:15.310 --> 07:20.130 Now I've got to find that original Cuban I'm going to do that in the rather than playing hunt. 07:20.480 --> 07:22.250 Kubic keep saying cube cone. 07:22.430 --> 07:23.790 Rather than playing hump the cone. 07:23.810 --> 07:25.680 I'm just going to select it in the outliner. 07:27.370 --> 07:31.580 And I'm going to rotate it and let's rotate it around the y axis. 07:33.210 --> 07:38.460 I'm sorry to have problems rotating it's rigour is rotating. 07:38.550 --> 07:42.850 Ah yes of course this has caught me out no end of times. 07:42.880 --> 07:48.150 On the plane itself we need to inherit the rotation. 07:48.520 --> 07:53.110 So let's turn them both back on and see what happens when we click on rotation. 07:53.110 --> 07:54.640 They rotate round brilliant. 07:54.640 --> 07:59.330 So let's just undo what we've just done with the rotation. 07:59.380 --> 08:00.230 There we go. 08:00.250 --> 08:01.750 So back to here. 08:01.750 --> 08:03.370 Back to plane back to rotation. 08:03.370 --> 08:09.370 Make sure that's turned on over to the cone and let's rotate it in the y axis and see what happens. 08:09.370 --> 08:18.280 So that looks like 90 90 degrees in the y axis sorts that out and makes it right obviously because we've 08:18.280 --> 08:22.900 got some hills here some of them will bit a slight angle because they follow the curvature of the ground 08:22.930 --> 08:24.230 that you place them on. 08:24.580 --> 08:26.900 So now that we've done that those look quite small. 08:26.920 --> 08:31.540 And you're thinking oh Mike I think you said if I set both to one they'll be full size. 08:31.540 --> 08:33.100 Well they are full size. 08:33.100 --> 08:34.800 It's just that half the cube is underneath. 08:34.810 --> 08:36.870 And that's to do with its origin. 08:37.060 --> 08:45.130 So if we go to the cone itself I keep saying cube if we go to the cone itself and the actual cone rather 08:45.130 --> 08:46.140 than anything else. 08:46.150 --> 08:50.230 Let's hop over to this player here. 08:50.230 --> 08:55.510 Click anywhere on the base with the left mouse button and that'll set the 3-d cursor and then we can 08:55.510 --> 09:02.170 just simply set the origin to the three cursor and see how that looks when we go back to this layer. 09:02.170 --> 09:03.100 Excellent. 09:03.100 --> 09:06.300 Now they're all on top of the surface. 09:06.310 --> 09:12.040 Now you can play with all the particle stuff that you've done before so you can go in an ADD children 09:12.040 --> 09:18.310 and if you do add children I would suggest they were interpolated So let's go to the children's section 09:18.310 --> 09:24.460 here and do interpolated and they will follow the curvature of the ground that's a very spiky ground. 09:24.460 --> 09:26.770 Now you won't want to stand on that. 09:26.920 --> 09:31.630 And of course you can play with the uniform and loads of other things to your heart's content so you 09:31.630 --> 09:34.180 could build up grass like this if you wanted to. 09:34.180 --> 09:38.010 Well that's another way of generating the geometry. 09:38.060 --> 09:45.280 Now one final thing let's turn off children for this moment in time so we can see what's going on. 09:45.280 --> 09:51.580 Let's go and add another particle system so I would always recommend if you're using one particle system 09:51.640 --> 09:56.100 and you've got loads more that are going to be similar that you get one of them right. 09:56.110 --> 09:57.070 To begin with. 09:57.220 --> 10:03.760 Because we can borrow those settings with a new one so that sets up a new particle system and called 10:03.760 --> 10:05.520 it kubes. 10:05.710 --> 10:11.860 And if we go here and we are talking about cubes this time we can borrow the currents. 10:11.920 --> 10:15.200 Now we need to make it unique by clicking on this number. 10:15.220 --> 10:21.440 Otherwise anything we change down here will change both of these particle effects. 10:21.460 --> 10:24.520 So let's go down here and press the number two. 10:24.520 --> 10:29.640 It changes to cone 0 0 1 and I'm going to rename that immediately kubes. 10:29.680 --> 10:34.120 Now it looks no different at the moment because we do need to scroll down to the object and change it 10:34.120 --> 10:35.000 to cube. 10:35.230 --> 10:39.010 And you can see here that we've still got the same problem with it being half half. 10:39.010 --> 10:43.300 I'm not going to sort that out at the moment but you can see that all of these objects are placed in 10:43.300 --> 10:45.660 exactly the same location. 10:45.670 --> 10:51.640 Now the way you change that scroll up and change the seed and the seed will change its placement. 10:51.820 --> 10:57.100 Now that's great for randomizing things and making sure they don't all appear in the same place especially 10:57.100 --> 10:59.130 if they've got the same number of admissions. 10:59.140 --> 11:03.620 Another way of changing it is to change the number of emissions that are going on. 11:03.730 --> 11:06.230 And eventually that will shuffle. 11:06.610 --> 11:10.320 But it does still have some on top of one another. 11:10.330 --> 11:17.260 So again changing the seeds will be the easiest way to make sure that they dont overlap right on top 11:17.260 --> 11:18.050 of one another. 11:18.280 --> 11:22.860 So the one final thing just like with the bunny you can use weight painting as well. 11:22.990 --> 11:25.640 So say we wanted only these. 11:25.830 --> 11:33.910 I will get my teeth back in the cones to be on the hilly parts of our of our mesh where we would make 11:33.910 --> 11:35.410 sure the mesh is selected. 11:35.410 --> 11:42.250 We go to the object data properties over here and let's scroll down with adverts group and I'm going 11:42.250 --> 11:45.390 to call it kones on Hill. 11:45.670 --> 11:52.500 It's always good to name it round this way and then immediately switch into white painting. 11:53.340 --> 12:00.070 I'm going to turn off our particle system so I can see what's going on with the eyes there. 12:00.090 --> 12:03.750 And so we've got these two hills so I can paint on that hill. 12:03.930 --> 12:09.560 I can paint on that hill and I probably have to spin round and paint the other side of the hill as well. 12:09.640 --> 12:19.860 And then I'm going to reduce or increase the size of the brush and reduce it strength down to 25 percent 12:20.300 --> 12:21.670 or thereabouts. 12:21.740 --> 12:22.850 Yeah that's fine. 12:23.130 --> 12:25.460 And I'm just going to go over there. 12:26.210 --> 12:28.850 Over here over there. 12:30.350 --> 12:31.640 There once more. 12:31.640 --> 12:32.660 There we go. 12:32.660 --> 12:40.130 So that should help control the distribution of our of our cones and limited to only these areas leaving 12:40.130 --> 12:41.610 the blue area clear. 12:41.630 --> 12:45.040 So let's turn them back on and the first thing you say is all the Keeps haven't moved. 12:45.140 --> 12:50.720 But remember the particle effect which is and this scroll down and changed the density setting under 12:50.720 --> 12:54.130 virtex groups the density here to kones on Hill. 12:55.030 --> 12:56.510 Oh that's great. 12:56.510 --> 12:57.560 I didn't check what I was doing. 12:57.560 --> 13:00.060 I have cues on health. 13:00.110 --> 13:06.200 I was right when I said Dubes the first phone round I'm going to do remember which one you're selecting 13:06.440 --> 13:08.200 when you're moving things about. 13:08.210 --> 13:13.500 Of course I can scroll down and this cones on here I can just remove that. 13:13.580 --> 13:18.890 Go to the cones themselves scroll down and click on gowns on Hill. 13:18.890 --> 13:19.370 There we go. 13:19.370 --> 13:21.440 So now the cones have moved to the Hill. 13:21.530 --> 13:30.020 And if I turn off the cubes themselves to here we can see that they're distributed more in the red areas 13:30.020 --> 13:32.740 than they are in the green and light blue areas. 13:32.780 --> 13:33.660 Perfect. 13:33.660 --> 13:37.820 Now armed with that knowledge I've got a challenge for you guys. 13:37.880 --> 13:45.680 I would like you to plant some grass create a particle system for each grass mesh object and see your 13:45.680 --> 13:47.780 landscape with grass. 13:47.840 --> 13:49.850 Use low quantities at this stage. 13:49.850 --> 13:56.390 Now might not look great but you don't want to slow yourself down when prototyping and use your texture. 13:56.390 --> 14:05.060 Plants that we've made spidering Lee through out the environment set the ground colour to create a ground 14:05.060 --> 14:06.050 material. 14:06.260 --> 14:14.600 I suggest a diffuse brown colour and reiterate your scene lots and keep your samples low ash you go 14:14.900 --> 14:22.770 and remember control and B to set a render border in the camera view to limit where your rendering said 14:22.820 --> 14:24.470 to give you some more suggestions. 14:24.470 --> 14:32.270 Turn off each particle system as you go for speed and seeing how each individual particle system looks 14:32.800 --> 14:37.720 and then finally when you render the scene there is a good chance they will take a long time. 14:37.760 --> 14:45.530 So keep those samples and resolution low intil you are happy to turn them up for fine or renders. 14:45.530 --> 14:53.660 So to give you an idea of what I mean when I was prototyping I have grass that looks like this and you're 14:53.660 --> 14:54.230 going well. 14:54.230 --> 14:55.990 That looks horrible and grainy. 14:56.150 --> 15:01.490 It's supposed to it's a prototype that took about 45 seconds or something along those lines to throw 15:01.490 --> 15:01.800 out. 15:01.870 --> 15:04.870 And I believe my samples were set to 5. 15:04.880 --> 15:07.760 I didn't want to wait ages I just want to get an overview. 15:07.760 --> 15:13.820 I keep iterating that and again I then mucked around with the grass and got it looking a bit more natural 15:14.030 --> 15:15.350 and I ended up with this. 15:15.350 --> 15:23.030 And again it's at five samples and when I looked at my rabbit's eyes when oh hang on a minute I have 15:23.390 --> 15:23.900 I can see. 15:23.900 --> 15:25.610 I can see the bit is supposed to be covered up. 15:25.610 --> 15:30.710 You know we didn't model the lakes to keep it nice and simple but that looks like a levitating magical 15:30.710 --> 15:32.870 bunny at the moment wishes certainly isn't. 15:33.090 --> 15:39.170 So I then set a render border up so I could focus on that small area and make sure it comes out correctly 15:39.170 --> 15:45.590 during the render and then and only then when I was happy with everything and set everything up did 15:45.630 --> 15:53.540 I hit the render button at a higher sample rethink I picked 75 for my samples here and as you can see 15:53.900 --> 15:56.330 it looks pretty good. 15:56.830 --> 16:03.070 So go ahead and pause a video and go and plant some grass across our landscape. 16:03.070 --> 16:09.680 Now I'm not going to be able to show you my solution in this video so that will be in the next lecture. 16:09.970 --> 16:15.030 So once you've done remember to share in the discussions your solution to this. 16:15.040 --> 16:18.710 I'd love to see them and I will see you in the next lecture.