WEBVTT 00:00.660 --> 00:08.820 Welcome to illusion of detail using bump maps in this video you will use a text to control how light 00:08.880 --> 00:11.190 is interacting with a surface. 00:11.190 --> 00:18.780 We'll see how to use texture as a bump map him blend render and use generated textures rather than hamade 00:19.050 --> 00:20.610 just to speed the process up. 00:20.610 --> 00:24.370 If you want more control of course you can make the texture by hand. 00:24.660 --> 00:29.920 So before we hop in a blender Let's have a quick overview of bump maps in general. 00:30.120 --> 00:38.220 Now normal and height or displacement maps are both types of bump map the term but maps often thrown 00:38.220 --> 00:38.620 about. 00:38.640 --> 00:39.660 But it does in Corpus. 00:39.660 --> 00:46.590 Both of those because they both change how light interacts with a surface. 00:46.590 --> 00:50.910 We're going to use a displacement map in this particular example. 00:51.000 --> 00:53.780 We'll move onto normal maps later on. 00:54.180 --> 01:01.800 Now what they do is they tell a shader how to interact with light so as a light ray goes across a completely 01:01.800 --> 01:02.850 blank surface. 01:02.850 --> 01:06.250 It usually just bounces off in a certain way. 01:06.420 --> 01:13.600 However what we can do is use a texture and this can give the illusion of detail on a surface. 01:13.650 --> 01:20.070 It fakes highs and lows so we get some detail on our surface. 01:20.310 --> 01:26.670 They can increase render speeds versus using geometry alone and not only that they can speed up construction 01:26.670 --> 01:28.550 speeds as you'll see in a few moments. 01:28.620 --> 01:35.670 There's absolutely no way that without using a texture would ever be able to make a brick look a bit 01:35.670 --> 01:37.170 more brick like. 01:37.620 --> 01:43.830 So let's have a quick look at hite's Maps vs. a normal map and see the difference. 01:43.830 --> 01:47.460 Here we have a very simple jagged surface. 01:47.460 --> 01:56.670 And as you can see the low points of the surface is dark and the high point is white and you can see 01:56.670 --> 02:03.210 there that they drift from one level to a mid grey then to a black again and then to wide as it reaches 02:03.210 --> 02:06.690 the highest point down to mid grey and up again. 02:07.020 --> 02:14.200 Now that is showing the height differences not necessarily the direction of the faces. 02:14.220 --> 02:18.900 With a normal map they don't display any height information. 02:18.960 --> 02:27.360 They simply show the direction that the faces when we fake them would be facing so we can see here that 02:27.360 --> 02:35.430 despite the fact that the faces themselves are higher up there's no change in the normal direction of 02:35.430 --> 02:37.050 that particular face. 02:37.110 --> 02:40.200 And of course we'll cover normal maps in a bit. 02:40.230 --> 02:44.640 So let's go play with displacement maps now or height maps over and blend up. 02:45.120 --> 02:50.100 Okay so we're back over in blender and I'm going to apply these bump maps. 02:50.100 --> 02:53.220 This displacement map to my wall piece. 02:53.220 --> 02:57.240 First of all for testing and I just want to show you here. 02:57.270 --> 02:59.070 The textures does look slightly different. 02:59.070 --> 03:06.090 I went in and spent about another half hour 45 minutes or so just adding a bit more detail to my my 03:06.090 --> 03:09.360 base colour there and I think that's turned out rather well. 03:09.370 --> 03:13.810 It's obviously not super detailed but I like the way it's come out. 03:14.160 --> 03:18.490 Am I am going to switch to blend render. 03:18.580 --> 03:20.160 Must blend again blend a render. 03:20.210 --> 03:25.530 Okay I'm just going to sort out my windows here so we can see what's going on. 03:25.810 --> 03:31.950 On a turn on rendered mode in the viewport shading and we don't see anything and the reason we don't 03:31.950 --> 03:38.160 see anything is because we are still using the node setups on so and toggle that of course you can use 03:38.160 --> 03:44.040 nodes for Blender and I've just elected not to so I can switch between these two setups to move across 03:44.040 --> 03:47.910 to the texture's tab and add in a new texture. 03:47.910 --> 03:55.650 Now we have a list of textures at the top here in blender render which we can use within our model and 03:55.710 --> 04:01.330 for the moment what I'm going to do is go down to the next text just slots. 04:02.270 --> 04:04.520 And add a new texture. 04:04.520 --> 04:09.310 I will change the type of texture to something I'm going to choose. 04:09.310 --> 04:11.670 Clouds I think that's going to work out pretty well. 04:11.690 --> 04:13.240 We can see over in the viewport. 04:13.250 --> 04:18.680 It's gone a bit odd and I'll explain what's happening there in a moment and this texture here is not 04:18.680 --> 04:23.160 very well named so I'm going to call that displacement. 04:23.830 --> 04:25.310 All very badly displacement. 04:25.310 --> 04:25.800 There you go. 04:25.910 --> 04:31.120 And this one here I'm going to call block work not block block work but just block work. 04:31.400 --> 04:38.240 Okay so we've got this texture underneath this one and it does work in is it the order here does matter 04:38.240 --> 04:42.360 it does work its way down so if something is. 04:43.490 --> 04:45.280 Here in the second position. 04:45.290 --> 04:50.060 If we move it to the first position we can see it's overwritten with block work. 04:50.090 --> 04:56.120 If we can't see this other texture and that's because both of these are trying to control the colour 04:56.180 --> 04:58.540 they're trying to influence the colour. 04:58.760 --> 05:06.230 If I scroll down here until we get to where it says influence we can see that they're both trying to 05:06.620 --> 05:13.250 control the colour and in this case the texture itself the black and white texture is saying where it 05:13.250 --> 05:14.150 is black. 05:14.150 --> 05:18.450 I don't want it to control any of the colour and where it is white. 05:18.470 --> 05:26.180 I would like it to control the colour based upon this colour down here so if I changed this to blue 05:26.540 --> 05:30.720 it'll be the cream and blue if I change it's any other colour it will be there. 05:30.800 --> 05:32.750 Green and cream. 05:32.750 --> 05:36.380 Now I don't want those clouds to control the colour. 05:36.650 --> 05:43.100 I would rather they controlled something else and I can have them control the secularity and if I turn 05:43.100 --> 05:45.170 the intensity down a little. 05:45.560 --> 05:48.030 Let's go for point eight let's say. 05:48.050 --> 05:54.710 Now when I move around you can see that this particular wall piece is reflective in certain places and 05:54.710 --> 05:55.890 not in others. 05:56.060 --> 06:02.000 And that's to do you do with that texture it's saying where there is reflection and where there is not 06:02.000 --> 06:03.500 reflection. 06:03.500 --> 06:09.230 Now since we're working with displacement maps you may think that's the right one to pick here. 06:09.270 --> 06:11.090 Under geometry is displace. 06:11.090 --> 06:12.850 You've probably been reading down here. 06:12.900 --> 06:15.020 Gone are about to click on displays. 06:15.020 --> 06:17.420 Well let's do it and we can see there. 06:17.420 --> 06:19.010 It doesn't do anything. 06:19.010 --> 06:25.880 The reason for that is for in order for a displacement map to actually display something it has to have 06:25.880 --> 06:27.560 something to splice. 06:27.560 --> 06:33.380 Now that does sound like a tongue twister that basically there's not enough geometry in this model currently 06:33.710 --> 06:36.660 for anything to be moved about. 06:36.810 --> 06:44.990 I would actually discuss actually using textures to control geometry later on not in this particular 06:44.990 --> 06:45.520 section. 06:45.530 --> 06:52.310 This is all about the illusion of detail not creating detail so I will want to put a tick in the normal 06:52.310 --> 06:52.860 box. 06:52.910 --> 06:58.460 Now even though that black and white image isn't a normal image blender render can work with it. 06:58.580 --> 07:05.540 And here we see that we end up with a bumpy surface based upon those clouds that it's generated over 07:05.570 --> 07:08.590 going too far we see that it's it's not perfect. 07:08.600 --> 07:16.370 We see the squares going on here of the pixel changes so we might require something a bit more high 07:16.370 --> 07:21.200 rez at some point but for this stage it's absolutely fine. 07:21.200 --> 07:23.000 Now we control the normal amounts. 07:23.000 --> 07:27.050 Obviously if we bump up the maximum five it looks really really bumpy. 07:27.050 --> 07:33.110 Now that is no good for a wall but that might be good for some muddy floor or something along those 07:33.110 --> 07:35.090 lines that has a lot of bumps ridges in it. 07:35.270 --> 07:40.770 If we set it to something like point five then we get a much more subtle effect. 07:40.880 --> 07:48.170 If we decide to go negative it simply inverts the colours so the highs become lows and the lows become 07:48.170 --> 07:48.940 highs. 07:48.950 --> 07:53.390 Now that is going to produce a different pattern to this. 07:53.420 --> 07:55.670 If I whack it all the way back up again. 07:55.760 --> 08:00.130 But essentially it is the same pattern just where it's fakin going in and out. 08:00.410 --> 08:06.200 Now one thing to bear in mind with the illusion of detail is where it breaks down is the edges. 08:06.200 --> 08:13.480 If I rotate this round and see that there aren't any bumps there are no bumps in this model at all. 08:13.700 --> 08:18.440 And that's where this illusion can break down especially around the edges. 08:19.600 --> 08:21.430 So that's something to bear in mind. 08:22.330 --> 08:23.830 Now I've been playing with this. 08:23.860 --> 08:31.250 And I think a normal value of point five is actually about right and that comes out pretty good. 08:31.570 --> 08:35.750 And there we go the displacement maps in a nut shell using Benda render. 08:35.780 --> 08:37.950 And I have got a challenge for you guys. 08:38.790 --> 08:45.900 I would like you to create a cycles based bump map so render yourself a nice example of the blender 08:45.900 --> 08:49.650 and a set up and use it as reference material. 08:49.650 --> 08:55.530 See you've got some guidance to how you want the new cycle's render to look like. 08:55.830 --> 09:01.670 Use a bump node to control your diffuse shaders normal impact. 09:01.880 --> 09:06.430 Experiment with the nodes to get a similar appearance. 09:06.450 --> 09:08.770 Now do bear in mind there is no correct method. 09:08.790 --> 09:11.850 So remember there is no right way of doing this. 09:11.850 --> 09:20.220 There will be multiple solutions however you can use a minimum of two nodes a generated textured node 09:20.700 --> 09:22.200 and a bump node. 09:22.200 --> 09:23.970 In order to do this. 09:24.650 --> 09:28.190 Being creative can end up with awesome results. 09:28.190 --> 09:32.310 Sometimes the unexpected can end up being better than what you planned. 09:32.420 --> 09:39.950 So remember to play around with these settings and remember to think through your nodes logically at 09:39.950 --> 09:40.370 the end. 09:40.370 --> 09:45.740 I'll go through some alternatives and the pros and cons of using those as well. 09:45.770 --> 09:47.100 Couple of hints for you. 09:47.300 --> 09:52.520 There is no cloud texture in cycle so you're going to have to use something else and there is lots of 09:52.520 --> 09:53.310 choice. 09:53.510 --> 09:59.840 And I'd like you to plug the texture into the diffuse colour inputs to see what it looks like. 09:59.900 --> 10:06.710 You don't have to do that but it's a great idea to get an understanding of how that texture that you're 10:06.710 --> 10:13.400 using to control actually looks so you can just plug it into the colour input of the few shader and 10:13.400 --> 10:18.480 see what it looks like and then you can replug everything Backhouse in as well. 10:18.510 --> 10:20.800 Pause video now and give that a go. 10:21.950 --> 10:29.180 Okay so let's go ahead and set up this in cycles so I'm going to go to my materials and enable nodes 10:29.210 --> 10:31.330 and switch over to cycles render. 10:31.340 --> 10:37.640 Now I'm not going to have my reference image on the screen because I've got it quite busy as it is at 10:37.640 --> 10:38.090 the moment. 10:38.090 --> 10:42.350 I'm just going to try and create myself a little more space on here. 10:42.350 --> 10:48.710 And well this is one of these examples where a floor would be quite useful on our model so we can see 10:48.710 --> 10:50.200 it a bit more in situ. 10:50.480 --> 10:53.920 So I am literally I hope that's on the ground. 10:54.080 --> 10:58.020 I'm going to go into object mode create a circle. 10:59.330 --> 11:06.410 Just for it to exist on and scale that up or it's way over there that's not gonna work quite as I expected 11:06.410 --> 11:07.000 it to. 11:07.010 --> 11:10.900 Let's just add another circle and delete the other circle in a moment. 11:10.940 --> 11:11.840 Too many circles. 11:11.840 --> 11:14.290 Now can I add a circle. 11:14.360 --> 11:15.930 Scale that up. 11:17.670 --> 11:20.150 Well that's an invisible circle at the moment. 11:20.210 --> 11:22.120 It's kind of cool Why is that invisible. 11:22.120 --> 11:24.700 That's very good question because it's not filled. 11:24.700 --> 11:25.690 There we go. 11:26.680 --> 11:28.530 So that's roughly on the base of this. 11:28.530 --> 11:35.530 Just to give it a bit of presence and I'm going to make I am going to make that in fact slightly glossy. 11:35.530 --> 11:41.480 I'm going to go for glossy So it looks like it's reflecting and increase the roughness. 11:41.670 --> 11:44.680 So a rough glossy material that's looking good. 11:44.800 --> 11:50.440 This sun isn't looking particularly bright is a sunlamp the strength to turn up a little. 11:51.130 --> 11:56.610 Okay so now we need to set this up in cycles which of course will be slightly different. 11:56.610 --> 12:02.770 So first of all let's switch across to cycles and make sure we're now using nodes for our material use 12:02.770 --> 12:03.360 nodes. 12:03.370 --> 12:03.870 There we go. 12:03.870 --> 12:07.210 So we've got our base to fuse texture back again. 12:07.210 --> 12:12.550 Now I've got a reference image off to one side that can't for everything on my screen Unfortunately 12:12.580 --> 12:16.330 if I bring everything on here I'll just get confusing. 12:16.570 --> 12:18.910 So I need to modify this. 12:18.910 --> 12:23.700 Let's zoom in a little and see how this is laid out so the output is what we're seeing. 12:23.830 --> 12:30.130 And we've got a diffuse shader based on here and the colour is being controlled from that image. 12:30.130 --> 12:30.520 Great. 12:30.520 --> 12:30.880 So that's. 12:30.880 --> 12:37.180 But that bit's set up so we need a nother texture to use for control. 12:37.180 --> 12:40.960 So we need to go ahead and add in texture. 12:40.960 --> 12:44.800 Now if I had an image texture that was appropriate I could use that. 12:44.800 --> 12:46.290 That's no problem at all. 12:46.300 --> 12:50.110 I can pick one of his other textures unfortunately clouds isn't there. 12:50.110 --> 12:55.780 So we're going to have to play with a couple of these and see what we get so I'm going oh I've just 12:55.780 --> 12:57.120 slipped off the menu there. 12:57.160 --> 12:57.810 I'm going to. 12:57.880 --> 13:01.000 First of all start with all brick texture. 13:01.000 --> 13:01.820 Does that work. 13:01.810 --> 13:07.950 So I'm going to plug in the colour to the few shader and just see what happens when I try this. 13:08.170 --> 13:12.530 Well it doesn't seem to be producing any sort of textures at the moment. 13:12.530 --> 13:15.050 Anyway I don't think that one's going to help us. 13:15.070 --> 13:21.180 It might do actually if we have the vector plugged in so none of these at the moment are being told 13:21.190 --> 13:27.540 none of these textures are being told how they are to be mapped so let's go and add in an input texture 13:27.550 --> 13:35.020 coordinate and say you are being matched with unique award let's say let's map in the spirit texture 13:35.020 --> 13:36.340 and see what happens. 13:36.580 --> 13:38.710 Oh okay that's that's interesting. 13:38.730 --> 13:41.300 That may that may help us. 13:41.320 --> 13:47.830 I'm not sure I think I'd have to match up the two blocks really well in order to hear that. 13:48.030 --> 13:50.570 But I don't think in this case that's going to help. 13:50.570 --> 13:57.640 If we had an already blank wall that might actually be helpful if we wanted those Square style bricks. 13:57.640 --> 13:59.280 I don't I want my other one. 13:59.280 --> 14:01.690 So let's find a different texture. 14:01.950 --> 14:04.000 So let's go ahead and add in texture. 14:04.000 --> 14:04.840 I'm going to try. 14:04.840 --> 14:06.260 Noise. 14:06.730 --> 14:11.430 So the vector that's been mapped out via u v and the colour. 14:11.440 --> 14:13.190 That's plug colour into colour. 14:13.640 --> 14:19.260 Okay so this one's got colour noise and it lets let's plug in the factor into colour. 14:19.310 --> 14:21.900 Theirs are black and white channel brilliant. 14:21.960 --> 14:28.880 So now we can go ahead and using the colour the original diffuse texture as the diffuse colour. 14:29.110 --> 14:32.220 And let's see what happens if we plug factor into normal. 14:32.590 --> 14:36.490 No that's not done what we want to so let's pull that out again. 14:36.490 --> 14:44.140 By the way when you're doing this there is a preview over in the materials side as well so we can open 14:44.230 --> 14:51.040 up the preview that's here and see how that's looking on different types of objects so this is what 14:51.040 --> 14:52.390 it looks like on a sphere. 14:52.390 --> 14:53.920 This is what it looks like on a plane. 14:53.920 --> 15:00.040 This is what it looks like on a cube Suzanne etc quite powerful options there. 15:00.040 --> 15:03.090 Well see what it's going to look like on other shapes. 15:03.100 --> 15:05.870 So let's try to factor into their Again narrow. 15:05.900 --> 15:07.360 It doesn't help at all. 15:07.360 --> 15:09.880 All it does is make our image rather dark. 15:09.880 --> 15:12.020 So we need something to convert to that. 15:12.040 --> 15:18.160 So it's compatible with this normal inputs and we use a bump no to do that so let's go ahead and find 15:18.190 --> 15:19.150 bumped node. 15:19.150 --> 15:22.180 Well it's under vector of course you could search for bump. 15:22.180 --> 15:27.890 So I'm going to add the bump node in there and using the fact I'm not going to control the normal angle 15:27.900 --> 15:29.700 much control the height. 15:30.790 --> 15:34.170 And then the output here I'm going to plug into that normal. 15:35.250 --> 15:37.850 That is starting to look much better. 15:38.580 --> 15:40.580 Starting get that bumpy feeling again. 15:40.650 --> 15:45.890 Of course it's not going to change the edges or the actual geometry at this point in time. 15:45.960 --> 15:51.290 Is only controlling how flight looks so we can change this distance here and set it up one. 15:51.760 --> 15:55.950 And in terms of strength how well no one's a bit too much. 15:55.950 --> 16:02.830 I think I would rather have it with a distance and maybe point to but slightly stronger. 16:02.830 --> 16:04.820 That's up that's okay. 16:05.670 --> 16:12.680 I would like it to be a bit more subtle than that so that's try point three and point five. 16:12.870 --> 16:14.470 Yeah they're starting to look much better. 16:14.470 --> 16:18.080 Of course we can tweak these to our hearts content. 16:18.240 --> 16:22.750 And you know be happy with one one moment and the next. 16:22.820 --> 16:27.720 We can also change the texture itself so I can make it a bit more bumpy. 16:27.750 --> 16:28.800 Ah. 16:29.160 --> 16:29.910 That is start. 16:29.920 --> 16:31.560 That's starting to look a bit more interesting. 16:31.560 --> 16:34.430 I'm liking how Suzanne is looking at this point in time. 16:34.500 --> 16:38.040 So that's more of a kind of a rendered finish if I bump this scale up. 16:38.040 --> 16:39.940 What does the detail though. 16:40.260 --> 16:41.820 Well let's let's lower that down. 16:41.820 --> 16:46.090 I think I am going to boost it up to maybe 20 or so. 16:46.140 --> 16:52.190 This detail if I lower it all down it's always good to go to extremes with these will with no detail. 16:52.700 --> 17:00.630 It's kind of a smooth bumpy and it tends to get well noisier I suppose with more detail in a distortion. 17:00.840 --> 17:02.700 All that starts adding swirls. 17:02.730 --> 17:04.130 That's kind of cool. 17:04.170 --> 17:04.640 Okay. 17:04.710 --> 17:07.260 So this is what I mean by the experimentation. 17:07.300 --> 17:12.540 In fact Blender's gone a bit laggy whilst it's rendering things out there we go with experimentation 17:12.540 --> 17:13.170 you can. 17:13.230 --> 17:17.700 Okay this is no good for our particular wall that we're working on but that's something to remember 17:17.700 --> 17:19.580 for later I'm pretty sure. 17:19.770 --> 17:22.600 So I'm happy with a slightly larger scale there. 17:22.610 --> 17:26.390 And so I'm going to go for too much more detail the eight. 17:26.390 --> 17:27.390 They'll let somebody find out. 17:27.420 --> 17:30.480 Now we've got that as we can see here. 17:30.540 --> 17:37.350 It's I can't see the texture underneath anymore so I'm going to have to bring the strength down so I 17:37.350 --> 17:43.160 can see the underlying texture as well that is looking pretty good. 17:43.160 --> 17:46.120 I feel I'm going to have to increase the distance here. 17:46.230 --> 17:51.570 And again these are tweaks you can go backwards and forwards to your heart's content and do now at a 17:51.570 --> 17:58.110 certain distance it seems to make no difference because based upon this strength here I'm going to lower 17:58.110 --> 18:05.160 that back down to say poitou so now our wall has a texture on it that will change based upon the light 18:05.190 --> 18:11.090 hitting it which is very important that means we haven't baked the lighting information into any texture. 18:11.190 --> 18:16.320 It's being generated based upon where the lights really are in our scene. 18:16.320 --> 18:21.600 Now a couple of other things I would like to do here of course is I am at a stage for it. 18:21.630 --> 18:24.510 Why am I going to do that in this particular solution. 18:24.610 --> 18:30.060 And I'm going to play with these a little more until I get to roughly the right point where I want to 18:30.060 --> 18:30.810 be. 18:31.020 --> 18:34.710 I mean you can play with this all day long. 18:34.710 --> 18:36.850 I'm quite happy with that. 18:36.870 --> 18:42.480 Now one of the questions that you might have is well why didn't we just plug this factor straight into 18:42.480 --> 18:43.530 that displacement. 18:43.590 --> 18:46.620 And I'm just going to remove the normals that we've created. 18:46.620 --> 18:49.920 Now there's a couple of reasons why we haven't done that. 18:49.920 --> 18:57.120 The first one is we want to control the diffuse shader how to diffuse shader is being handled not how 18:57.180 --> 19:02.790 everything at the very end is being handled so there's a slight distinction and difference between the 19:02.790 --> 19:03.290 two. 19:03.390 --> 19:07.860 But this is also a valid solution for the right effect. 19:07.860 --> 19:14.850 Again like most things in blender as long as you get the end desired result a lot of using blender is 19:14.850 --> 19:21.390 kind of a mixture of knowledge and just trying things out and making sure you're logical with how you 19:21.390 --> 19:22.790 plug things in. 19:22.800 --> 19:29.970 So in this case we do want to specifically control the diffuse shader and how that interacts with light. 19:30.120 --> 19:36.570 If we plug it in all the way into displacement it changes how the whole object or anything else that 19:36.570 --> 19:40.110 this material is applied to interacts with light. 19:40.110 --> 19:44.730 So I'd love to see what textures you came up with and apply to your wall. 19:44.730 --> 19:48.860 How did they look when you move them across to the building that youre creating. 19:48.870 --> 19:53.630 Remember to share in the discussions and I will see you guys in the next lecture.