WEBVTT 00:00.270 --> 00:03.030 Welcome to the geometry node in this video. 00:03.030 --> 00:04.390 We're going to use this note. 00:04.400 --> 00:11.280 Take control of an object's Normal's you'll see that the vector coordinates or the direction the normals 00:11.280 --> 00:16.730 are facing in we will observe are represented as a world space normals. 00:16.800 --> 00:22.110 So before we've been dealing with tangential or even objects space these are going to be represented 00:22.140 --> 00:27.140 in world space although looks similar but slightly different to what we've seen in the past. 00:27.540 --> 00:30.960 And we shall use this node to control the amount of four. 00:30.960 --> 00:36.000 Now based upon the amount of roughness that surface has. 00:36.300 --> 00:42.120 So before we go and hop on over into blender let's just go through a quick reminder of normals I'm sure 00:42.120 --> 00:43.210 you've all got this by now. 00:43.320 --> 00:49.440 Here we have a very simple ice sphere with the face Normal's projected out. 00:49.740 --> 00:53.550 And let's just see what we're aiming to do with the node itself. 00:53.550 --> 00:58.610 And I'm gonna to grab a pen and digital bits of paper to show you what's going to go on. 00:59.410 --> 01:02.940 Okay so we're going to have the camera in the scene itself. 01:03.130 --> 01:09.460 That's in here and here we have a circle for instance with its Normal's coming out and a money going 01:09.460 --> 01:10.500 to draw a few of them. 01:10.600 --> 01:13.440 Obviously there's a lot of Normal's when it comes out of the circle. 01:13.510 --> 01:15.780 And this is a true representation of course. 01:15.790 --> 01:21.520 We're going to really deal with a sphere now these normals here are not going to be seen by the camera 01:21.520 --> 01:21.990 itself. 01:22.000 --> 01:25.000 So we can ignore those completely in this example. 01:25.000 --> 01:31.450 But what we can do with the geometry node is tell blender instead of the normal going out in its normal 01:31.450 --> 01:32.800 direction. 01:32.800 --> 01:40.180 Every single normal faces the camera obviously they're going to look odd but we can use that to our 01:40.180 --> 01:44.750 advantage when using it to control other nodes. 01:44.920 --> 01:48.880 And we'll do that now as we hop on over into a blender. 01:49.240 --> 01:56.880 So let's go play about with our node now and or our with our nodes and see what we can come up with. 01:57.010 --> 02:01.570 And again I'm going to construct a simple scene or in this case I'm actually going to go to my scene 02:01.600 --> 02:05.760 at the very back and we use control to turn everything on. 02:05.910 --> 02:14.170 And I'm going to once again use a simple sphere to work with some and I open up my scene here and turn 02:14.170 --> 02:16.800 everything off apart from fireball. 02:17.020 --> 02:21.280 Parve fireballs he turns everything else off. 02:21.280 --> 02:23.150 They're there and they're okay. 02:23.920 --> 02:31.150 So we've got a very interesting shade a setup here a bit bely before we've got a bump node and the other 02:31.150 --> 02:34.360 bits running around it with the wave texture. 02:34.360 --> 02:42.220 Our believe I've applied the part of this to an admission shader So actually glows and lights up his 02:42.220 --> 02:43.670 surroundings as well. 02:43.750 --> 02:45.370 Hence its name fireball. 02:45.380 --> 02:51.370 Anyway enough of this particular texture or this particular material wasn't going to do is actually 02:51.370 --> 02:54.450 apply a PBR plastic to it. 02:54.850 --> 02:57.330 So we can work with simple material. 02:57.340 --> 03:04.630 Okay so what we need to do is first of all Add in a geometry node so we can work with that and then 03:04.630 --> 03:08.840 go through and see how that actually affects the rest of our model. 03:08.860 --> 03:12.720 So let's go into the node set up here and just have a look. 03:12.790 --> 03:15.430 Okay so we need to add a geometry. 03:15.760 --> 03:21.820 So go ahead and find that it's under input geometry and it gives us a series of options are run through 03:21.820 --> 03:25.250 them really quickly but not in great detail. 03:25.720 --> 03:28.530 The position is it's position in the world. 03:28.540 --> 03:37.470 So if I literally move that about's you can see it changes colour depending on it's X Y Z location okay 03:37.480 --> 03:38.670 are not moving up and down. 03:38.680 --> 03:41.330 It's just easier not to do that's normal. 03:41.380 --> 03:49.150 Well unsurprisingly that is the world Normal's and that is the standard normal coming off of this particular 03:49.180 --> 03:49.650 object. 03:49.660 --> 03:56.650 This sphere itself has hundreds of normal spread out across its surface in the direction or the vector 03:56.650 --> 04:03.310 coordinates of those normals relate directly to the colour mix in between all the shades. 04:03.310 --> 04:10.660 Tangent is it's tangential coordinates based upon the real world True normal. 04:10.660 --> 04:15.080 Now we're going to have a little bit of a hard time seeing this on this particular object. 04:15.100 --> 04:15.370 Yeah. 04:15.370 --> 04:16.590 There we go. 04:16.630 --> 04:20.260 This is how it looks without the smoothing applied. 04:20.320 --> 04:28.300 So even if your model is smooth you can use the true Normal's rather than the interpolated ones between 04:28.350 --> 04:32.590 when you've got smooth shading turned on incoming. 04:32.620 --> 04:34.740 Now that has made all. 04:34.780 --> 04:40.090 Obviously if we zoom in really closely on that submit this bigger it will change the normal slightly 04:40.090 --> 04:41.630 depending on the angle to the camera. 04:41.630 --> 04:48.280 But as we zoom out we end up with all the normals pretty much facing the same direction towards the 04:48.280 --> 04:55.160 camera or in this case the viewport parametric is interesting. 04:55.420 --> 05:01.250 It's generally used to make lattices or grids if you want to go round that way back facing. 05:01.270 --> 05:06.940 Now this is one that you can use to your advantage if you want one material on one side and one material 05:06.940 --> 05:07.690 on another. 05:07.810 --> 05:12.490 Because if the normals are facing outwards is coloured black and if they're facing inwards it's coloured 05:12.490 --> 05:13.250 white. 05:13.270 --> 05:16.940 The only way of doing that is to go inside and there we go. 05:16.960 --> 05:25.090 That's the inside of our sphere going white pointy ness is something that's hard to show on this particular 05:25.090 --> 05:33.310 model but it basically goes from black to white depending on convex or conté or how concave something 05:33.310 --> 05:33.730 is. 05:33.760 --> 05:41.520 Now the surface of this sphere is continuously convex as it's uniform convexity. 05:41.530 --> 05:43.070 I don't know if that's a word but it's great. 05:43.080 --> 05:48.820 Unger's Stick with it it's uniform convect So is all one colour as it goes round. 05:48.820 --> 05:55.660 Now if we were to make it a dimple or have a sharp ridge you could then see the effect. 05:55.660 --> 05:58.670 So if it's incredibly sharp coming out. 05:58.770 --> 06:01.130 Out of your model being concave. 06:01.250 --> 06:09.080 It will be almost white and if it's going into your model and is equally as sharp had deep groove that 06:09.080 --> 06:14.030 will be coloured close to black and you can use a figure like a colour ramp or a brightness and contrast 06:14.030 --> 06:16.540 node in order to exaggerate that. 06:16.670 --> 06:23.870 And then perhaps set up a mic shader with two different outputs and depending on those outputs you can 06:23.870 --> 06:29.900 use the pointedness to basically colour anything that has a sharp output or perhaps a rust material 06:29.900 --> 06:31.440 or a more worn material. 06:31.460 --> 06:35.290 You often find that painted surfaces that have sharp edges. 06:35.420 --> 06:39.460 The paint wears off of the sharp edges rather than the flat face. 06:39.480 --> 06:43.240 So you can use that type of control. 06:43.250 --> 06:51.640 Now we need to basically see what's the effect of this on our friend nele node. 06:51.650 --> 06:58.940 Now the issue with having a node group like this is I can't just see what the French l.a. looks like. 06:58.940 --> 07:01.720 I can't pull it like I can normally. 07:01.760 --> 07:07.250 So in this particular case there's a couple of options we could rearrange the group in order to work 07:07.250 --> 07:11.480 out what's going on a move the fanelle outside and that's a bit a faff. 07:11.480 --> 07:18.290 So in this particular case I'm going to tab out and I'm going to go to the node menu and ungroup or 07:18.350 --> 07:22.950 Altern G and then I'll just break everything out of that group again. 07:23.240 --> 07:29.770 Okay so let's now have a look at what's going on and leave enough space here and zoom in. 07:29.810 --> 07:34.240 So we've got our standard set up that we've played with plenty of times. 07:34.430 --> 07:36.260 Okay I'm happy with everything here. 07:36.260 --> 07:43.790 So what we want here are we don't have a value node coming in here to control it so let's add a value 07:43.820 --> 07:44.890 node. 07:44.930 --> 07:45.700 So here we go. 07:45.710 --> 07:51.140 Value node then we can control this top value by the power of 2.5. 07:51.260 --> 07:53.710 And that's going to control our roughness. 07:53.750 --> 07:55.730 Let's just make sure everything's working. 07:55.730 --> 07:58.930 So obviously a value of one is going to be totally rough. 07:59.060 --> 08:01.600 Valid point five is going to be slightly shiny. 08:01.850 --> 08:03.380 And point one has some gloss. 08:03.380 --> 08:04.960 We can see the area around it. 08:04.970 --> 08:10.130 Now I'm going to colour in the surface a darker colour just so we can see the reflections a little more 08:10.130 --> 08:10.920 clearly. 08:12.560 --> 08:13.250 There we go. 08:13.250 --> 08:13.700 Perfect. 08:13.700 --> 08:16.180 I can actually see the reflections really well. 08:16.280 --> 08:19.380 So let's have a look at the final l.a. and see what's going on here. 08:19.420 --> 08:24.500 The case of this is the fanelle fall off as standard now as standard. 08:24.500 --> 08:26.260 Is this normal here. 08:26.270 --> 08:29.950 So let's go ahead and plug that in and make sure it's still working. 08:30.260 --> 08:31.460 Excellent. 08:31.460 --> 08:34.780 Now what happens if we try some of these off of once. 08:34.890 --> 08:37.850 That's not giving us the desired results. 08:37.850 --> 08:40.830 That's not given a desired result true normal. 08:41.360 --> 08:46.600 Well that's going to be the same as normal just a bit more faceted incoming. 08:46.970 --> 08:48.520 Ah okay. 08:48.670 --> 08:50.550 That's just unplug that. 08:50.570 --> 08:55.080 If we look at the very centre of this particular for a nail. 08:55.790 --> 09:00.460 If we plug in incoming The normals are all facing us. 09:00.620 --> 09:03.350 So there's no more for an l effect. 09:03.350 --> 09:10.850 So if we were to mix between these two we should be able to control the an l.a. Based upon this value 09:10.910 --> 09:12.900 down here. 09:13.220 --> 09:17.930 So this is one of the ways we can actually change this for an L around. 09:18.230 --> 09:20.530 And that leads me onto a challenge. 09:21.580 --> 09:25.320 Okay I'd like to go ahead and set up your notes. 09:25.540 --> 09:33.310 So finish off the set up of our own notes so that as the roughness increases you'll want the friend 09:33.310 --> 09:35.760 nail effect to decrease. 09:35.950 --> 09:37.540 Give it some thought. 09:37.540 --> 09:40.310 Pause the video now and give that a go. 09:43.080 --> 09:44.520 Okay guys welcome back. 09:44.660 --> 09:48.620 Let's go finish off the set up of our notes and control the roughness. 09:48.650 --> 09:51.330 And for now with only one slider. 09:52.630 --> 09:55.730 Okay so we are almost here at the moment. 09:55.730 --> 10:00.790 Now we've got a geometry node here and we need to blend between. 10:01.000 --> 10:05.080 I think we need to blend between normal and incoming. 10:05.080 --> 10:12.040 Now there are a couple of ways of blending but because these values here are vector values we can actually 10:12.040 --> 10:14.590 use the karbalaa mix. 10:14.590 --> 10:18.040 RG B node we were using in the last section. 10:18.190 --> 10:20.820 So let's just add these two together. 10:20.860 --> 10:27.100 Incoming on the bottom and normal on the top of a pole the output here see what happens as we go from 10:27.100 --> 10:28.570 one at the other. 10:28.630 --> 10:29.460 Okay. 10:29.650 --> 10:35.680 Let's plug the colour output here into the normal input here. 10:35.680 --> 10:43.390 Now hopefully that won't need any anything else doing to it because obviously where we've got normal 10:43.390 --> 10:49.630 values coming in and normal values coming out now obviously we can change the ratio of mixes through 10:49.630 --> 10:54.350 here because the mix node here will be assuming is a colour going through. 10:54.400 --> 11:00.140 So it may actually change the well colour correct it basically. 11:00.190 --> 11:05.410 So if you have to be a little bit careful when we use the r.g. node like this but let's let's move this 11:05.410 --> 11:09.910 down and hopefully we see the fanelle effect come back into full effect. 11:09.940 --> 11:11.640 Perfect. 11:11.650 --> 11:16.090 So now let's just make sure we've got vs the right way around. 11:16.090 --> 11:19.820 I think we have the best thing to do is plug this in. 11:19.930 --> 11:27.250 So when it's glossy or a value of zero here we want it to be fully normal so the top one. 11:27.250 --> 11:28.030 Excellent. 11:28.210 --> 11:33.550 And as we move across as we increase the roughness we want the frontal effect to go down. 11:33.550 --> 11:35.230 Now it's only ever going to go up to one. 11:35.230 --> 11:42.460 So one should be completely uniformly not black but it's going to be about 20 percent grey or something 11:42.460 --> 11:43.380 on those lines. 11:43.420 --> 11:45.960 Okay that looks like it's working really well. 11:46.150 --> 11:52.570 So let's go out and poll the mix shader And let's see what happens so I'm going to hold down Shift so 11:52.570 --> 11:55.590 I can wear my scanner click this and go between them. 11:55.630 --> 12:03.160 Okay so this is almost 100 percent reflective in this case and we've got a nice reflection going around 12:03.160 --> 12:06.310 our model and let's make it slightly rougher. 12:06.610 --> 12:10.640 And as it's getting rougher the frontal effects should start falling off. 12:10.810 --> 12:15.450 And of course we can add other things in here to change the fall off rate. 12:15.640 --> 12:17.000 Perfect. 12:17.170 --> 12:22.360 So this is getting quite rough now and there's still a little bit of reflection is not very clear anymore 12:22.630 --> 12:26.070 but it's starting to work really really well. 12:26.140 --> 12:29.210 This is very close to how the real world works. 12:29.230 --> 12:32.350 So we've got a value node here that's controlling all of this. 12:32.560 --> 12:36.850 Now what we can do is pop this all back in. 12:37.670 --> 12:45.710 To our mix or sorry into our group says Go ahead here and you'd make a group. 12:46.040 --> 12:49.640 Okay so we've got a group impot What do we want to control. 12:49.640 --> 12:53.730 Well we want to control the this value here now. 12:53.750 --> 12:55.830 There's no input to this value. 12:56.030 --> 13:05.440 So what we can do here is literally drag a value across to the input here and then link it up. 13:06.140 --> 13:12.110 Individually there we get through it it's called value here that a value is no good it doesn't explain 13:12.110 --> 13:14.610 what is going to be roughness. 13:15.520 --> 13:16.900 Okay perfect. 13:16.900 --> 13:22.440 What else do we need to make sure we've got on this input so we can control it well if it's got texture 13:22.450 --> 13:25.910 we're going to want to control the Normal's of everything here. 13:25.990 --> 13:27.730 So let's go ahead and do that now. 13:27.880 --> 13:34.100 So I'm just literally going to link them one by one in here. 13:38.780 --> 13:39.800 So normal. 13:39.810 --> 13:44.370 I just pulled that out saw some wound going to have to plug it back in a moment. 13:44.920 --> 13:47.970 So what makes the colour coming out of here. 13:48.940 --> 13:50.230 This was the rough nurse. 13:50.230 --> 13:55.660 The facts of the colour comes out into that normal sense that normal there needs to be controlled by 13:55.660 --> 13:57.200 here. 13:57.370 --> 14:03.100 So here we've got an issue where if we want the normal to affect the free now we can't have it coming 14:03.100 --> 14:10.750 in so we'll have to mix those or even add them together if we want to control the for now with a normal 14:10.750 --> 14:11.660 map as well. 14:11.800 --> 14:14.680 I don't think that's necessary in this particular case. 14:14.680 --> 14:15.890 I'm going to leave it out. 14:16.010 --> 14:21.380 Now I do want the base colour coming out so I'm going to plug this in and I'm not leave as colour. 14:21.550 --> 14:25.780 I'm going to call it diffuse or bass or whatever you're working with. 14:25.780 --> 14:29.970 How bideau Map is another name it's used to diffuse colour. 14:30.280 --> 14:32.140 Of course that could be a texture. 14:32.140 --> 14:34.280 There could be no end of things. 14:34.300 --> 14:38.870 Is anything else that I want to expose to the outside of this node. 14:38.980 --> 14:42.460 I don't think there is colour. 14:42.490 --> 14:44.700 No the colour of the reflections. 14:44.710 --> 14:47.510 I'm going to leave as they are. 14:48.570 --> 14:49.290 The power. 14:49.290 --> 14:51.600 Do I want to be able to control that rate. 14:51.600 --> 14:52.760 No that's fine. 14:52.770 --> 14:57.300 So I got this loose end entity here I'm going to get rid of that. 14:57.810 --> 14:58.490 Okay. 14:58.620 --> 15:04.290 And Tab outside I've now got this noad group that has a roughness slider that I can control. 15:04.290 --> 15:11.010 Obviously it only controls it between 0 and 1 anything greater than that is just a 100 percent smoother 15:11.010 --> 15:12.750 100 percent rough. 15:12.840 --> 15:17.160 Now most things in the real world are not rough. 15:17.160 --> 15:18.990 Of course it can go up. 15:18.990 --> 15:23.880 Sorry not the entirely rough or entirely smooth slightly polished in certain places. 15:23.880 --> 15:30.390 So again going back to using textures to control things I could put in a wave texture here and plug 15:30.390 --> 15:32.830 it into roughness and you can see here. 15:32.850 --> 15:36.660 Well it almost has a ripple effect in this case. 15:36.780 --> 15:42.330 But if I scale that down just a little perhaps to 1 so we have got so much we can see as glossy and 15:42.330 --> 15:48.260 places and matine Others as if it's been slightly polished somewhere and not in other places. 15:48.270 --> 15:54.060 And again when we link this together we can see that the black band itself as to go back to our node 15:54.060 --> 16:02.510 group black band is indicating where it's going to be most glossy and the white band is where it's going 16:02.510 --> 16:07.560 to be most Matt and we can use that to our advantage obviously wheezing a texture here so it's not going 16:07.560 --> 16:10.180 to have quite the effect that I'd like to demonstrate. 16:10.290 --> 16:15.470 But if you had if you had mapped your particular sphere here that we were working on. 16:15.520 --> 16:20.580 There was a particular area of it that was handled often so hed naturally polished. 16:20.640 --> 16:26.340 Again that can help with the realism of your models were some bits are going to be naturally more polished 16:26.340 --> 16:31.100 or glossy than others so I'm just going to clear that out there. 16:31.110 --> 16:36.300 The final thing that I haven't done here I am going to change that back to a red because I do like that 16:36.300 --> 16:44.550 read and I'm going to make it a little bit lighter again is actually save this particular material. 16:44.580 --> 16:52.530 Otherwise it's going to get lost so I've only played with my default settings here so all I need to 16:52.530 --> 17:00.450 do is literally save the start-up file but before I do that I do want to make sure I'm back in a kind 17:00.450 --> 17:04.850 of a default position so I usually look from this angle. 17:04.860 --> 17:09.230 It doesn't matter whether you are in rendered mode or not automatically will open like this. 17:09.420 --> 17:17.160 So you got a stage there and a good flip back round to lael one about open this back up again so that's 17:17.160 --> 17:18.340 how I want it. 17:18.360 --> 17:19.820 Next time I start. 17:19.890 --> 17:23.280 And of course you can adjust yours to how ever you like. 17:24.140 --> 17:26.600 I'm going to hide the rest of my examples. 17:26.700 --> 17:29.460 Close down the hierarchy here. 17:29.460 --> 17:31.560 I like that that all looks good. 17:31.560 --> 17:38.070 So I'm going to save my start-up file and that's now save that new PBR plastic material we've improved 17:38.070 --> 17:45.020 upon it because now we're able to change the roughness and the final effect on the same time. 17:45.030 --> 17:46.470 How did you guys get on. 17:46.470 --> 17:51.910 Are you starting to get the hang of modifying your original blend files every time you open it up. 17:51.960 --> 17:54.360 You're not having to start afresh anymore. 17:54.360 --> 17:57.350 It's incredibly useful being able to do that. 17:57.540 --> 18:03.320 As always make sure you show your work in the discussions and I will see you guys in the next lecture.