WEBVTT 00:00.930 --> 00:03.140 Welcome to the for an owl married. 00:03.300 --> 00:04.850 So what does this do. 00:04.860 --> 00:12.300 Well it makes things more physically accurate and that is because everything has a friend nele effect 00:12.360 --> 00:15.530 in the real world and we go into more about what that is. 00:15.630 --> 00:21.990 In a moment now cycles does not do it by default so we have to mix some nodes together to make sure 00:21.990 --> 00:24.540 we get the effect that we want. 00:24.540 --> 00:31.380 Now one of the things to remember is that if your surface has a low roughness it has a high amount. 00:31.410 --> 00:32.720 A friend now. 00:33.180 --> 00:40.830 So for instance anything that's glossy is going to exhibit this more than something that is rough. 00:40.890 --> 00:45.020 So a high roughness equals a low amount for a now. 00:45.570 --> 00:47.320 So how does it function. 00:47.490 --> 00:53.550 Well simply put it calculates the proportion of incident lights of the light that is coming in from 00:53.550 --> 01:00.510 our lamps from the environment from whatever that is reflected off of a surface versus the amount that 01:00.510 --> 01:01.650 does something else. 01:01.650 --> 01:07.050 Now I say does something else because it does depend on what surfaces some of it will obviously be absorbed. 01:07.050 --> 01:11.680 Otherwise you wouldn't see the surface if we were talking about water and liquids. 01:11.820 --> 01:18.710 Well is going to go through the surface and start lighting up the base of the pond or the lake or whatever 01:18.720 --> 01:20.190 it happens to be. 01:20.220 --> 01:23.770 So let's have a couple of looks at some real world examples. 01:23.850 --> 01:26.490 So here we have the roof of a car now. 01:26.580 --> 01:33.360 Cars are pretty reflective in general and you see that closest to us where we're looking at it's almost 01:33.360 --> 01:34.340 straight on. 01:34.470 --> 01:41.190 There's less reflection then if we go further along towards the other car you can see in the background 01:41.190 --> 01:41.610 there. 01:41.640 --> 01:47.970 So we end up with more of the lights going through and hitting the paint underneath the clear coat on 01:47.970 --> 01:54.570 top of the car as it goes round so we see more of the base colour as we go around and further towards 01:54.870 --> 01:56.460 the top of the car. 01:56.490 --> 02:00.710 You can see more and more of the sky so you get more and more reflection. 02:00.870 --> 02:09.540 The lower that angle of incidence is to the viewer here we have another example of a car where we've 02:09.540 --> 02:17.310 got we can actually see the blue of the car and as we actually go further and further away from are 02:17.610 --> 02:23.520 our straight on angle we get a white and that's obviously reflecting the sky in the sun. 02:23.640 --> 02:28.560 And what we can see here this is the four an l effect happening so depending on the angle you're viewing 02:28.560 --> 02:33.110 depends on the angle of reflected light that you're going to see. 02:33.150 --> 02:38.280 Now a classic example of the for an l effect is something along the lines of this where we've got a 02:38.310 --> 02:44.610 gorgeous scene in front of us and we pay attention to the water because that is the highly reflective 02:44.610 --> 02:50.410 surface of this is an example of something with low roughness as all the others have been. 02:50.500 --> 02:54.160 But this is extremely low roughnesses is going to have a high for an l effect. 02:54.270 --> 02:59.130 So closest to the camera where we're almost looking through the water obviously we can't look into the 02:59.130 --> 03:06.720 water on this particular shot but you can see more of the bottom so more of the light is being refracted 03:06.750 --> 03:14.280 and hitting the base of the of the lake here and then being reflected now as we go further into the 03:14.280 --> 03:16.340 distance to the far end of the lake. 03:16.470 --> 03:25.180 More and more of that light is being reflected rather than refracted and transmitted through the water. 03:25.470 --> 03:30.720 Now here we have something that we've all experienced whether it's with a phone screen or a laptop screen 03:31.020 --> 03:34.140 when the angle is not directly facing us. 03:34.260 --> 03:41.010 We end up just seeing pure reflections of what's on the outside world rather than what we're trying 03:41.010 --> 03:41.970 to look at. 03:41.970 --> 03:45.750 This is something you can experiment with straightaway if you want to. 03:45.840 --> 03:48.970 We can really see the effect in full flow. 03:49.170 --> 03:53.520 So now we seen some real world effects of how the frenzel effect works. 03:53.520 --> 03:57.370 Let's go explore this now and hop on over in a blender. 04:00.880 --> 04:05.820 Okay so over on a default blend file now before I do anything else because I'm fed up of doing this 04:05.830 --> 04:08.070 I'm actually going to modify my start-up file. 04:08.250 --> 04:17.310 I want to select this lamp number of times I've now switched it to a sunlamp and change to the surface. 04:17.370 --> 04:18.240 Use nodes. 04:18.270 --> 04:26.220 That's NEWS NOTES here surface emission and set the strength to three the number of times I have had 04:26.220 --> 04:29.530 to do something along those lines is getting a joke now. 04:29.540 --> 04:30.780 So now I've done that. 04:30.960 --> 04:36.820 What I can do is go ahead and save my start up far than the next time I go file a new. 04:37.050 --> 04:40.560 It actually starts up with the lamp. 04:40.560 --> 04:42.290 Perfect that's exactly what I want. 04:42.360 --> 04:47.340 So when I go to rendered mode I actually get the bright uniform light across my scene. 04:47.400 --> 04:51.900 I have to set up almost every time so I won't be setting them up any more because it's already done. 04:52.140 --> 04:57.570 Okay so we've got our cube here and I'm just going to shift that back in our scene and again. 04:57.600 --> 05:03.720 Well actually in this point what I can do is open up a previous file if I wanted to but I'm just going 05:03.720 --> 05:06.600 to add a couple of objects into my scene. 05:06.600 --> 05:13.050 Doesn't really matter where for the moment because we're going to see them reflected in the surface 05:13.050 --> 05:14.660 in a few moments so. 05:14.700 --> 05:17.540 One final object let's go for a cone. 05:17.930 --> 05:22.390 Okay I'm going to turn snapping on so I can lift that up. 05:22.470 --> 05:27.920 And the same with the cylinder and I'm just going to move that back in the cross slightly. 05:27.930 --> 05:34.410 I'm going to put objects at slightly different places so I can see how the reflection changes with distance 05:34.410 --> 05:35.860 in a few moments. 05:37.020 --> 05:37.410 Kate. 05:37.500 --> 05:38.270 Perfect. 05:38.360 --> 05:40.820 I've managed to put that one relatively high. 05:40.820 --> 05:48.180 The final thing I want to do is add in a plane along and scale that up to cover the entire lot. 05:48.230 --> 05:54.440 The reason why I've added a plane is because this is going to become our reflective surface much like 05:54.470 --> 05:58.160 The Lake is with the mountains and trees in it all in the background. 05:58.220 --> 06:01.580 So all these low poly mountains and trees if you'd like. 06:01.910 --> 06:03.220 So now we've got that setup. 06:03.230 --> 06:09.540 I'm going to get rid of the tall shelf go into rendered mode make sure everything's working perfect. 06:09.730 --> 06:14.420 Another shift this across so I can see still see what's going on in rendered mode. 06:14.420 --> 06:21.470 But switch this one to the noda and I've gone to a vertical sort of workflow here rather than horizontal 06:21.860 --> 06:25.930 and actually I'm going to get rid of those two will not get rid of them but pushed them to the side. 06:26.820 --> 06:32.600 I'm going to add my alarm and make sure that selected the plane is selected and then create new material. 06:32.600 --> 06:38.030 I am going to call this water doesn't have to be water but in this case it's going to be. 06:38.870 --> 06:41.080 And we've got a set up here. 06:41.120 --> 06:47.210 We've got diffuse going into a material output so that's the default material we've currently got. 06:47.210 --> 06:51.920 So I need to show you guys where they're from l.a. is You might have seen it earlier if we go ahead 06:51.950 --> 06:57.580 and add in input and friend now and there we go. 06:57.590 --> 07:04.760 So that's now ready to be used in order to change the reflectivity of this surface based upon me angle 07:04.850 --> 07:06.740 that you're looking at it. 07:06.890 --> 07:13.520 Now one of the things we can do is actually hold down control and shift and click on for now and we 07:13.520 --> 07:19.370 can see the effects in action so we can see that it's going to be a dark grey not black. 07:19.370 --> 07:22.190 It will become darker and darker if you play with the Io. 07:22.210 --> 07:26.940 Ah but we can see here it's dark grey when we're looking straight down. 07:27.380 --> 07:30.000 So have a value close to zero. 07:30.260 --> 07:37.040 And then as we get less and less as we start going down to a much shallower angle to that surface it 07:37.040 --> 07:37.930 gets more white. 07:37.940 --> 07:41.440 And as we can see here there's actually a gradient as well. 07:41.600 --> 07:46.880 So we can see there that the which ordered to place things in as well. 07:46.910 --> 07:54.360 We can see the gradient there from not quite zero maybe Point 1 or so on grey all the way up to one. 07:54.380 --> 07:58.990 This will be white at the very top so that would be the most reflective. 07:59.300 --> 08:04.420 So just set up the diffuse snoad as the main outputs again. 08:04.640 --> 08:08.000 And then of course it's time for a challenge. 08:08.120 --> 08:15.530 I'd like you to go ahead and set up for an l.a. SIR add the remaining shade as necessary to make the 08:15.530 --> 08:18.150 friend node effective. 08:18.200 --> 08:23.430 Remember we need a shallow angle furthest from the normal to be reflective. 08:23.540 --> 08:31.640 And as we approach the normal off the surface for it to transition to another shader pause a video now 08:31.910 --> 08:33.180 and give that a go. 08:35.130 --> 08:36.650 Okay guys welcome back. 08:36.660 --> 08:38.700 Let's go set up the four in l.a.. 08:39.520 --> 08:45.530 Okay so we're back over in blender and one of the first things that I need to do is decide on while 08:45.550 --> 08:49.680 we need something reflective to begin with if we're going to make this work. 08:49.680 --> 08:53.540 So let's go ahead and add in a gloss shader. 08:53.890 --> 08:55.160 There we go. 08:55.180 --> 08:58.620 So we now have two shaders to transition through. 08:58.630 --> 09:02.420 So we need to mix these two together. 09:02.930 --> 09:06.210 I'm going to use the node Wrangler shortcuts to do that. 09:06.220 --> 09:06.700 There we go. 09:06.700 --> 09:15.550 Got a shader plugged in and we need to change the front women factor here so where it's glossy or shady 09:15.550 --> 09:18.830 so glossy here pure reflective just to test. 09:18.850 --> 09:22.780 Of course I could use a control shift and click on it to us to isolate it. 09:22.780 --> 09:24.140 Let's go back to the mix shaner. 09:24.340 --> 09:29.560 We can see that the roughnesses say a point to so we're never going to get a decent reflection straight 09:29.560 --> 09:29.820 off. 09:29.820 --> 09:31.720 So let's lower that down to zero. 09:31.720 --> 09:38.880 So we do get 100 percent reflection and we want it as we come up here to be. 09:40.080 --> 09:44.610 Almost diffuse came with a tiny bit of reflection of course because it's not going to be there so that's 09:44.790 --> 09:48.030 the factor in here and see what happens. 09:48.240 --> 09:54.270 K. writes that is going the wrong way we can see that straightaway because it's not being highly reflective 09:54.300 --> 09:58.870 when we're down here it's being highly reflective at the other end. 09:58.890 --> 10:04.830 Kate So the next thing we need to do is swap these around then so let's swap them round if I'm going 10:04.830 --> 10:06.780 to reorder them as well. 10:06.810 --> 10:08.810 Just so it looks better. 10:08.820 --> 10:11.440 It doesn't look nice if you've got things crossing over. 10:11.650 --> 10:15.810 Okay so let's have a look at there now so it's diffuse all the way up here. 10:15.840 --> 10:20.420 And it starts to get more and more glossy The further you come down. 10:20.490 --> 10:21.280 Excellent. 10:21.300 --> 10:24.580 Someone to drag this ball actually closer. 10:24.690 --> 10:26.140 Oh it's. 10:27.750 --> 10:29.240 Closer to us. 10:30.340 --> 10:33.590 So we can see this far less reflection closer to the camera. 10:33.730 --> 10:36.040 Then there is a way from the camera. 10:36.180 --> 10:38.200 Okay that's perfect. 10:38.200 --> 10:42.790 How did you guys get on did you play with certain things so we go back to the surface here. 10:42.850 --> 10:45.970 Did you play with this Iowa to see what it does in fact. 10:45.970 --> 10:47.280 Let's do that now. 10:47.370 --> 10:53.950 I'm going isolate it first so we can see the pure what's actually going on so we keep it this shallow 10:53.950 --> 10:57.730 angle so we can see almost no. 10:57.970 --> 10:58.720 Oh no. 10:58.780 --> 11:02.670 Glossy coming through it all the way up to gloss coming through. 11:02.980 --> 11:12.160 So here we have an eye o are one point four five oh if we lower that down we see that we get more. 11:12.360 --> 11:15.720 All in fact if we go all the way down we get pure white. 11:15.970 --> 11:19.640 We don't seem to be able to stop going up. 11:19.900 --> 11:25.490 So is most effective lowering it because we get a much stronger gradient. 11:25.540 --> 11:31.810 So this is going to really emphasize the fact it's not going to be glossy close and glossy further away. 11:31.810 --> 11:38.680 I'm going to go for a valuable 1.0 and then control shift click on the mix shader again and just see 11:38.680 --> 11:39.430 what's happening. 11:39.530 --> 11:45.980 Okay so as you can see here it's at this sort of angle these are very reflective. 11:46.000 --> 11:46.980 Well let's make this bigger. 11:46.990 --> 11:49.090 So you guys can really see what's going on. 11:49.330 --> 11:54.760 So at this angle you can hardly see the reflection of this sphere but you can see the reflection of 11:54.760 --> 11:56.300 everything else in the distance. 11:56.380 --> 12:00.190 That's perfect that's exactly what I wanted to achieve. 12:00.190 --> 12:02.630 How did you guys get on please show your work. 12:02.680 --> 12:06.950 In the discussions and I will see you in the next lecture.