WEBVTT 1 00:00:00.000 --> 00:00:04.000 Welcome to Normals in Blender! In this 2 00:00:04.000 --> 00:00:06.933 video we're going to learn about normals, 3 00:00:06.933 --> 00:00:10.933 why they're important, and how to fix them if they've gone wrong. 4 00:00:10.933 --> 00:00:14.000 Let's hop over into Blender! 5 00:00:14.266 --> 00:00:18.266 So here we have the periscope, which we've reduced to 12 vertices, 6 00:00:18.266 --> 00:00:22.266 and we're going to do something a little silly, we're going to 7 00:00:22.266 --> 00:00:26.266 push it through itself. So with the Edge Select 8 00:00:26.266 --> 00:00:30.266 Tool in Edit Mode, I'm going to select this top edge 9 00:00:30.266 --> 00:00:34.266 and push it through itself at the back here. 10 00:00:34.266 --> 00:00:38.266 Now you can see it's gone a bit of a funny color, 11 00:00:38.266 --> 00:00:42.266 If we more around now. It's not quite rendering how it was 12 00:00:42.266 --> 00:00:46.266 before. Now when it comes to your 13 00:00:46.266 --> 00:00:50.266 normals, they are incredibly important. If we were to export this now 14 00:00:50.266 --> 00:00:54.266 to another 3D package, it would not render 15 00:00:54.266 --> 00:00:58.266 correctly. So I want to show you now how to show 16 00:00:58.266 --> 00:01:02.266 your normals, so you can understand A which way they're 17 00:01:02.266 --> 00:01:06.266 pointing and B how to correct them. 18 00:01:06.266 --> 00:01:10.266 So over in the Properties Pane, if we scroll down there are 19 00:01:10.266 --> 00:01:14.266 two sections that we're going to focus on. One is called Shading 20 00:01:14.266 --> 00:01:18.266 and one is under Mesh Display, Normals. So 21 00:01:18.266 --> 00:01:22.266 first of all, let's do the Mesh Display! Now there are several 22 00:01:22.266 --> 00:01:26.266 types of normals but, in this case, we want Face Normals. So we're going to click 23 00:01:26.266 --> 00:01:30.266 the Face icon there and we're just going to increase the size a little, 24 00:01:30.266 --> 00:01:34.266 and that shows us which way our 25 00:01:34.266 --> 00:01:38.266 Face Normals are facing. Now, for rendering 26 00:01:38.266 --> 00:01:42.266 purposes, light will come in and it will strike a surface, 27 00:01:42.266 --> 00:01:46.266 but if the normal isn't there, if it's facing the other way 28 00:01:46.266 --> 00:01:50.266 like these ones are here, you end up with something like this. 29 00:01:50.266 --> 00:01:54.266 So go up to Shading 30 00:01:54.266 --> 00:01:58.266 and turn on Backface Culling. Now Blender's quite 31 00:01:58.266 --> 00:02:02.266 cleaver, it just demonstrates the 3D model for you. 32 00:02:02.266 --> 00:02:06.266 However, in most other programs you'll get a model that 33 00:02:06.266 --> 00:02:10.266 kind of looks like this, with this weird 34 00:02:10.266 --> 00:02:14.266 sort of display going on. It's all see through but only at certain angles, 35 00:02:14.266 --> 00:02:18.266 and that just won't do, it would look absolutely silly when 36 00:02:18.266 --> 00:02:22.266 it comes to exporting it into another package. 37 00:02:22.266 --> 00:02:26.266 I'm just going to turn on this other one here, called Ambient Occlusion. It just 38 00:02:26.266 --> 00:02:30.266 makes it, you know, highlights it just that much more. What's going on 39 00:02:30.266 --> 00:02:34.266 here as we twirl around, it just looks, well it looks a mess 40 00:02:34.266 --> 00:02:38.266 and it is a mess! So how do we go about sorting this 41 00:02:38.266 --> 00:02:42.266 out? Well there are a couple of ways, so in this case, 42 00:02:42.266 --> 00:02:46.266 we can pick Face Select whilst we're in Edit Mode, 43 00:02:46.266 --> 00:02:50.266 we can click the face we're referring to, go to Mesh, 44 00:02:50.266 --> 00:02:54.266 Faces, and Flip the Normal around. 45 00:02:54.266 --> 00:02:58.266 Now that will enable us to... Well now the 46 00:02:58.266 --> 00:03:02.266 normals are facing outwards, and we can do the same for all of 47 00:03:02.266 --> 00:03:03.966 these faces. 48 00:03:03.966 --> 00:03:07.700 So guys, I have a challenge for you! 49 00:03:07.700 --> 00:03:09.433 In your assets 50 00:03:09.433 --> 00:03:12.500 you will find a file called Normal_ 51 00:03:12.500 --> 00:03:16.500 Mess.blend. I'd like you to open up that file 52 00:03:16.500 --> 00:03:20.500 and set all of the normals to face outside. 53 00:03:20.500 --> 00:03:24.500 Go pause the video now and give that 54 00:03:24.500 --> 00:03:28.500 a go! 55 00:03:28.500 --> 00:03:32.500 Welcome back! Let's show you how to fix the normal mess! 56 00:03:32.500 --> 00:03:36.500 So if we go and open up Normal_Mess... 57 00:03:37.233 --> 00:03:41.233 So here we have the normal mess, and it looks 58 00:03:41.233 --> 00:03:45.233 like we've got some patches. It's almost like a Rubik's Cube 59 00:03:45.233 --> 00:03:49.233 going on here, and these patches have the 60 00:03:49.233 --> 00:03:53.233 normals faced the wrong way. So we can just check that by opening up the Properties 61 00:03:53.233 --> 00:03:57.233 Pane, going to Shading, and turning on Backface Culling, 62 00:03:57.233 --> 00:04:01.233 and whoa! We've got some holes in our mesh and it looks horrible! So as 63 00:04:01.233 --> 00:04:05.233 you can see, this is how it would import into 64 00:04:05.233 --> 00:04:09.233 another package, and that's not what we want. So let's hop into Edit 65 00:04:09.233 --> 00:04:13.233 Mode and see if we can solve this! So let's select the object 66 00:04:13.233 --> 00:04:17.233 first, hop into Edit Mode, and there we 67 00:04:17.233 --> 00:04:21.233 go! We can see... Oh, naughty naughty! I left 68 00:04:21.233 --> 00:04:25.233 all of these faces selected. I better go edit that for you guys, 69 00:04:25.233 --> 00:04:29.233 so [Laughs] you don't have so much of an easy job, 70 00:04:29.233 --> 00:04:33.233 and so we could go along and we could select the faces 71 00:04:33.233 --> 00:04:37.233 going into Mesh and going Flip Normals, to put them 72 00:04:37.233 --> 00:04:41.233 right. And of course, you can hold down Shift, as you go through these, 73 00:04:41.233 --> 00:04:45.233 and go Faces, Flip Normals. Ah the other 74 00:04:45.233 --> 00:04:49.233 thing you can do is, you can select everything. So we can go down to Select 75 00:04:49.233 --> 00:04:53.233 and go Select All. 76 00:04:53.233 --> 00:04:57.233 If it doesn't do it the first time, it will deselect if anything else is selected. 77 00:04:57.233 --> 00:05:01.233 And then, we can go to Mesh, 78 00:05:01.233 --> 00:05:05.233 and along here, if I put my glasses 79 00:05:05.233 --> 00:05:06.333 back on... There we go! 80 00:05:06.333 --> 00:05:09.833 So Normals, here we go, Recalculate Outside! 81 00:05:09.833 --> 00:05:13.833 That's the one we wanted, and that will flip them all so they're facing 82 00:05:13.833 --> 00:05:17.833 outwards, out of the model. And finally, we can just 83 00:05:17.833 --> 00:05:21.833 check that with one other check, and 84 00:05:21.833 --> 00:05:25.833 if we scroll down here, we can turn Face Normals on and just extend the size 85 00:05:25.833 --> 00:05:29.833 and we can see they're all now facing outwards. 86 00:05:29.833 --> 00:05:33.833 How did you guys get on? I hope it was good! 87 00:05:33.833 --> 00:05:35.633 See you in the next lecture!