WEBVTT 00:01.080 --> 00:07.100 Welcome to light PAFF render settings in this video you will learn about like path's and how they're 00:07.110 --> 00:14.450 critical when using transparency so to give you an example of what I'm talking about in this scene. 00:14.460 --> 00:18.510 We have a lot more grass than we've done before. 00:18.510 --> 00:22.920 And as you can see there are these nasty black and shaded areas. 00:23.160 --> 00:29.460 Well that's all to do with the transparency setting how much light is let through and after it's passed 00:29.460 --> 00:33.600 through a certain number of them it stops and turns black. 00:34.260 --> 00:40.900 Increase the number and you get no more blackness no more horrible artefacts in our image. 00:41.090 --> 00:45.000 So let's go explore this now and hop on over into a blender. 00:45.360 --> 00:47.080 Okay welcome back into blender. 00:47.090 --> 00:53.490 And I've just realized I probably didn't have this one before I do like this particular sky. 00:53.750 --> 00:55.400 But I don't quite like the ground at the moment. 00:55.400 --> 01:01.520 I can always go back and change that the one I was using before wasn't a Mirrorball by an equally rectangular 01:01.520 --> 01:02.080 one. 01:02.120 --> 01:08.580 And if I go ahead and open up the section assets I think it is this one here Sky photo 3. 01:08.620 --> 01:11.720 That's not going to update here until I re render. 01:11.780 --> 01:14.010 So let's go ahead and do that now. 01:14.210 --> 01:17.090 Yes that's what I had on there before. 01:17.150 --> 01:19.350 Because it's more cloudy than the other one of. 01:19.380 --> 01:20.560 Hop back into 3D. 01:20.570 --> 01:26.880 You can see as we move about we've got some sky in there an overcast day yes. 01:26.900 --> 01:30.150 But otherwise looking pretty good. 01:30.500 --> 01:38.360 Okay so let's hop over into the 3-d view and hop in to solve it. 01:38.360 --> 01:44.060 No not solid just go solid lump material mode there and we can see our grass. 01:44.060 --> 01:51.320 So let's go ahead and experience what we mean by light path's and how they interact and to do this example 01:51.320 --> 01:56.840 I'm just going to grab one of these and shift it to the side and then zoom into it on a more socgen 01:56.840 --> 02:05.210 to move the camera off of it for the moment so we can move around quite freely and zoom right into our 02:05.210 --> 02:06.050 model. 02:06.050 --> 02:07.530 Now we've done this. 02:07.610 --> 02:13.070 Let's take a peek at the light path's themselves over in the render tab. 02:13.070 --> 02:19.770 Now if we scroll down here there will be a heading called light puffs and here it is. 02:19.900 --> 02:22.140 Let's make this a bit bigger after making it smaller. 02:22.370 --> 02:27.690 So this area here is all about how light works in cycles. 02:27.720 --> 02:30.980 And important day there's this transparency. 02:30.980 --> 02:36.860 So anything that light passes through after it's passed through eight times its maximum time it won't 02:36.860 --> 02:38.710 pass through anymore. 02:38.720 --> 02:40.800 So let's put that to the test. 02:40.880 --> 02:44.510 So let's go ahead and go into rendered mode in the viewport shading. 02:44.510 --> 02:46.410 We've got our blade of grass here. 02:46.550 --> 02:50.490 It is selected at the moment and I'm going to apply an array modifier. 02:52.720 --> 02:59.740 And it's going the wrong way at the moment so let's do a constant offset on it's going to be the z axis 02:59.740 --> 03:03.440 I believe because it's a texture X some y a left arm. 03:03.500 --> 03:06.990 Why is up so that can be confusing. 03:07.060 --> 03:08.840 Let's just try let's put it on point. 03:08.870 --> 03:16.660 Yes it's gone behind so Z in this case is relative to the object itself the texture itself and because 03:16.690 --> 03:17.950 it's a 2D object. 03:17.980 --> 03:20.640 It has no depth so up is. 03:21.010 --> 03:23.220 And Sideways is Z. 03:23.230 --> 03:29.850 And this in this case going backwards is Z it's very confusing. 03:29.950 --> 03:31.120 But you'll get used to it. 03:31.120 --> 03:34.900 Don't worry there are a couple of other things that are like that in blender as well. 03:34.900 --> 03:40.130 So there's count here what I'm expecting is as we go up to eight. 03:41.190 --> 03:43.790 Now we're starting to see something on the bottom here. 03:43.800 --> 03:46.510 This is called a bit black and 9. 03:46.520 --> 03:51.690 There we go we've got ourselves some horrible blackness. 03:51.740 --> 03:58.610 Now the way to counter that of course is to go into the render tab and increase the number on your transparency's 03:58.610 --> 04:00.620 here and two you don't have it anymore. 04:00.770 --> 04:06.590 In fact notionally you could probably turn up to a hundred for the time being and you would be absolutely 04:06.590 --> 04:07.240 fine. 04:07.250 --> 04:17.510 However it does apply to not only this object here and the transparency going through here but anything 04:17.510 --> 04:19.510 else that you're also passing through. 04:19.640 --> 04:25.100 So if we grabbed another one of these blades of grass and put it in between all of these however many 04:25.100 --> 04:25.930 times we've done it. 04:25.950 --> 04:29.000 We've done it 8 9 4 or we've done it 14 times. 04:29.000 --> 04:30.200 They'll be 28. 04:30.230 --> 04:33.500 That it has to pass through and then it will start going black. 04:33.500 --> 04:34.690 Very confusing. 04:34.730 --> 04:38.060 Essentially you would have to set this higher and higher and higher. 04:38.090 --> 04:44.470 We'll have to watch that if we decide to use a lot of textures for our blades of grass. 04:44.480 --> 04:52.490 So with that in mind get these settings set up get them understand play play around with how many it 04:52.490 --> 04:55.950 takes before it starts going wonky for you. 04:55.950 --> 05:00.790 If you set that down to zero it's no good at all it hardly lets any light through. 05:00.790 --> 05:07.130 It all looks ghastly and of course as this goes up I don't know if this numbers got a top Yes it has 05:07.140 --> 05:08.860 1024. 05:08.870 --> 05:14.870 So in theory with blades of grass would be very easy to hit that number because there are quite a few 05:14.870 --> 05:16.410 blades of grass on the ground. 05:16.410 --> 05:22.360 However we're unlikely to be looking through a thousand twenty four of them and actually see the thousand 05:22.390 --> 05:24.450 and 24th blade of grass. 05:24.470 --> 05:29.240 There's going to be something blocking that any way so that shouldn't become an issue but it's worthwhile 05:29.240 --> 05:31.570 knowing there is a maximum to that. 05:32.270 --> 05:34.500 Okay guys it's challenge time. 05:34.580 --> 05:37.790 And it's a thought exercise on transparency. 05:37.940 --> 05:40.060 So grab a pen and paper. 05:40.070 --> 05:43.030 If one near you or just think about it lots. 05:43.130 --> 05:44.780 Best if you write it down now. 05:45.080 --> 05:49.360 So think about how many blades of grass you've seen might have in it. 05:50.270 --> 05:51.580 I'll give you a hint. 05:51.740 --> 05:52.620 Lots. 05:53.830 --> 05:56.940 Now imagine your laying on the grass looking down. 05:56.950 --> 06:03.220 How long do you think it would take before the transparency level itself didn't matter because another 06:03.220 --> 06:06.610 blade of grass or something solid was blocking it. 06:06.640 --> 06:12.000 Now what would help reduce the number of blades of grass in a straight road. 06:12.070 --> 06:14.290 Other than no grass at all. 06:14.620 --> 06:18.490 And what else could we use to model grass as well. 06:18.490 --> 06:19.860 Think about that. 06:20.110 --> 06:24.140 So pause a video now and write down your answers. 06:26.680 --> 06:27.270 Okay guys. 06:27.280 --> 06:28.040 Welcome back. 06:28.180 --> 06:29.350 Let's have a look at those. 06:29.350 --> 06:32.890 And then I've got another modelling challenge for you afterwards. 06:32.890 --> 06:36.760 So first of all think of how many blades of grass you'll see might have in it. 06:36.760 --> 06:37.870 Hint lots. 06:37.870 --> 06:43.660 It's going to have a couple of thousand at least probably tens of thousands of blades of grass in it. 06:43.810 --> 06:47.310 So it is important that we only put grass where it's needed. 06:47.530 --> 06:52.130 Otherwise we're asking the computer to render things unnecessarily. 06:52.240 --> 06:57.830 Now imagine your laying on the grass it wouldn't take long for more grass to overlap. 06:57.940 --> 07:04.930 So I think after about 100 blades of grass or so you're bound to actually pass through any transparency 07:04.930 --> 07:05.700 problems. 07:05.740 --> 07:11.710 But thinking about the different levels is well I'd probably go for around 150 or so because it is going 07:11.710 --> 07:15.730 to be some grass that's taller than others and especially as you get towards the top of the grass you're 07:15.730 --> 07:20.200 going to have some that are taller than others and obviously then they're going to be able to see further 07:20.290 --> 07:26.040 along what would help reduce the number of blades of grass in a straight run. 07:26.350 --> 07:32.800 Well what you could do is change the level of the ground and that would also change the view of the 07:32.800 --> 07:38.050 grass itself which is a great idea for maintaining a bit more interest in the scene. 07:38.050 --> 07:45.230 After all we are modelling a rabbit in some grass not a field of corn so it doesn't have to be perfect. 07:45.280 --> 07:47.330 And what else could we use to model grass. 07:47.350 --> 07:51.480 Well the clue is in the question we could actually model grass. 07:51.480 --> 07:53.980 Physically it will take us longer to do. 07:53.980 --> 08:00.340 However we've got to weigh up the length of time it would take to model some blades of grass vs. the 08:00.340 --> 08:05.980 length of time it take to render it using the texture's because it is going to take slightly longer 08:05.980 --> 08:07.920 to do that way. 08:07.930 --> 08:13.660 When we come to rendering So there's there's pros and cons to both and will decide later on after we've 08:13.660 --> 08:14.980 done a few tests. 08:14.980 --> 08:16.600 Which way to go. 08:17.290 --> 08:17.760 Okay. 08:17.830 --> 08:21.550 So I said there was going to be another challenge so we're going to hop back over into blender in a 08:21.550 --> 08:28.420 few moments but I would like you to set light parts and create some interesting landscape. 08:28.420 --> 08:35.220 So say your light path transparency tour around 150 This should be ample for this scene. 08:35.530 --> 08:40.410 If it turns out later it's not then you can just just adjust that figure any way. 08:40.420 --> 08:42.190 So it's not a big deal. 08:42.190 --> 08:44.620 It creates some interesting landscaping. 08:44.620 --> 08:50.830 Nothing massive just some subtle ground level changes using the tools you've learned so far. 08:50.830 --> 08:53.670 So pause the video and give that a go. 08:55.510 --> 08:56.130 Okay guys. 08:56.140 --> 08:56.940 Welcome back. 08:57.070 --> 08:59.230 Let's hop over into blender. 09:00.510 --> 09:06.600 Right so the first things first transparency's right here unkissed going to go straight there and set 09:06.600 --> 09:10.530 it to 150 right now that that's done. 09:10.530 --> 09:15.720 We're going to have to create some interesting geometry so let's go ahead. 09:15.810 --> 09:18.910 This is grass I'm going to change it to ground. 09:19.620 --> 09:20.620 Play him. 09:22.630 --> 09:27.280 So I know exactly what it is because it's an it's going to be where the grass is coming from but it 09:27.280 --> 09:29.060 needs to be a bit more interesting. 09:29.170 --> 09:33.990 And I think I actually need our rabbit in the scene as well so I composed the scene properly. 09:35.640 --> 09:36.730 Right. 09:36.830 --> 09:42.130 Oh my grass is pretty small that rabbits pretty large at the moment. 09:42.150 --> 09:45.240 We're going to have to do something to change that. 09:45.240 --> 09:48.340 I think we're going to shrink our rabbit down a little. 09:48.460 --> 09:51.930 So let's just go to the rabbit itself. 09:51.930 --> 09:53.550 I am happy with that. 09:53.760 --> 09:59.410 And I'm going to scale that down by point to a fifth for size. 10:00.320 --> 10:04.380 Who's a little bigger I think points for. 10:05.520 --> 10:09.030 There again I'm happy with the scaling of the Rabbit a bit lower. 10:09.030 --> 10:09.720 Brilliant. 10:09.720 --> 10:15.210 So let's let's think about the ground itself. 10:15.300 --> 10:21.750 In fact why have all this ground in front of our upper Let's move our rabbit locking into the z axis 10:22.200 --> 10:23.860 down here somewhat. 10:24.560 --> 10:25.030 Excellent. 10:25.030 --> 10:27.770 So let's play with our ground itself. 10:27.780 --> 10:33.100 So hop in solid mode here select this and going to edit mode. 10:33.110 --> 10:36.910 Now there's a couple of ways that I can alter the ground itself. 10:36.920 --> 10:43.470 Now the moment the ground consists of four edges four vertices so we can't really do much with it. 10:43.490 --> 10:48.590 Well we could go into the sculpts tooled and do some sculpting with it but I don't think they'll give 10:48.590 --> 10:55.320 us the desired results and the reason for that is it's going to create lots of patchy bits of geometry. 10:55.370 --> 10:59.400 It'd be best if we uniformly divided this and then moved it about. 10:59.570 --> 11:02.030 So you can just subdivide it. 11:02.240 --> 11:09.050 And then in the operator panel down here we can just increase the number of cuts here until it makes 11:09.050 --> 11:09.380 sense. 11:09.380 --> 11:11.120 We don't need it over the top. 11:11.180 --> 11:15.590 I think tens as far as you can go and 10 should be absolutely fine if it's not. 11:15.740 --> 11:20.010 We can always subdivide again now that we've actually done that. 11:20.030 --> 11:25.560 We can go in and pick a face any face at all let's pick that one and go to move it. 11:25.580 --> 11:29.660 But moving it with proportional editing turned on. 11:29.720 --> 11:34.310 So once it's turned on we can pick and choose how we want it to lift up and down. 11:34.460 --> 11:36.020 Smooth is absolutely fine. 11:36.020 --> 11:37.040 I'm going to grab that. 11:37.890 --> 11:44.800 In using the mouse will proportional size is currently very small can see at the bottom there is increasing 11:45.310 --> 11:47.940 and in a few moments there we go. 11:47.950 --> 11:52.260 The cat is actually big enough to have an effect now I don't want to make a mountain like that because 11:52.270 --> 11:56.310 it will look ridiculous so let's just bring it back down a little bit. 11:56.310 --> 11:59.680 It's useful being able to pick those bits up. 11:59.680 --> 12:06.150 Now the tree itself I actually want that's up on sort of like a little bit of a plateau perhaps. 12:07.550 --> 12:14.680 Up there like that so got a bit more interest in the geometry itself and would be here with the rabbits. 12:14.870 --> 12:20.170 In fact it might even rotate the rabbit round will do the sort of composition bits later on. 12:20.310 --> 12:23.770 We can push this ground down if we like. 12:25.340 --> 12:27.410 I'm liking the look of that so far. 12:27.440 --> 12:33.170 I just want this top bit a bit more plateaued a bit flatter so let's bring it in. 12:33.170 --> 12:35.440 It all vary. 12:35.560 --> 12:42.590 Go out how's Howzat looking there I could put I could mumble into the microphone for hours on end schriner 12:42.590 --> 12:43.340 Perfecter. 12:43.490 --> 12:47.360 But I'm happy with that so far it's looking pretty good. 12:47.360 --> 12:52.310 Of course all of my cameras now I've moved the rabbit null and void are happy to sort those out at some 12:52.310 --> 12:52.930 point. 12:53.110 --> 12:56.240 Amber I'm like him the look of that landscape. 12:56.240 --> 12:58.130 So how did you guys get on. 12:58.130 --> 13:04.730 Please share in the discussions your landscapes that you've come up with and I will see you guys in 13:04.730 --> 13:05.950 the next lecture.