WEBVTT 00:00.150 --> 00:07.080 Welcome to texture's with transparency in this video you will learn how to use cycles nodes to apply 00:07.080 --> 00:14.610 transparency to your image and use groups for nodes for simplicity and then use those node groups again 00:14.650 --> 00:16.500 on other materials. 00:16.500 --> 00:19.150 So let's hop straight on over in a blender. 00:19.170 --> 00:23.280 So this is where we left off before and of course I'm now going to guide you through. 00:23.280 --> 00:28.910 First of all the solution to the last challenge and I'll talk through the workings as I go. 00:29.100 --> 00:32.190 So I'm going to make this a lot larger here. 00:32.190 --> 00:36.410 All I need to see is a thin sliver of the material at the top. 00:36.490 --> 00:42.570 So I'm going to get rid of this tangent nodes that I've added and I'm going to add in now the first 00:42.570 --> 00:48.880 thing we need to interact with light how light is interacting with a surface that's going to be a shader. 00:48.900 --> 00:52.340 So I'm going to add a shade darker shade a shade. 00:52.350 --> 00:53.110 There we go. 00:53.160 --> 00:55.280 And it's how it's going to be transparence. 00:55.360 --> 00:59.520 Along here we've got a transparent B sdf. 00:59.610 --> 01:03.950 Now some of you might want to know what B S D F stands for. 01:04.080 --> 01:08.390 Well it stands for bi directional scattering distribution function. 01:08.610 --> 01:15.780 And if we have a look at the wikipedia article for it we can see it's a series of Count relations of 01:15.780 --> 01:19.300 how light interacts with surfaces where it hits them. 01:19.470 --> 01:23.100 And there's loads of other types of interactions as well. 01:23.100 --> 01:30.110 Do you go ahead and read this wikipedia article for more information on how it actually works. 01:30.180 --> 01:34.390 But suffice to say it details how light interacts with a surface. 01:34.620 --> 01:37.650 So let's get rid of that and hop straight back into a blender. 01:37.650 --> 01:42.000 So we need to link both of these outputs to the surface. 01:42.030 --> 01:47.880 Now the surface determines what's the actual surface of the middle of the geometry is going to look 01:47.880 --> 01:48.450 like here. 01:48.450 --> 01:54.000 So if we try and link them together we'll see we get one or the other. 01:54.000 --> 02:00.720 Now the good thing there is it does look like when we had transparency and just transparency we it goes 02:00.720 --> 02:04.430 transparent so that's a good thing Hello that is working. 02:04.440 --> 02:10.730 Now we've got to mix these two together and they're both shaders So we need to mix a shader. 02:10.980 --> 02:15.260 Now I'm going to go to add and shade and then let's say there's something called mix in here. 02:15.270 --> 02:17.250 There is mix shader. 02:17.460 --> 02:23.370 So if we select that and literally we can pop anything on top of something like that and it puts it 02:23.370 --> 02:23.820 in. 02:23.910 --> 02:27.770 Now before we connect the other one let's just move this factor up and down. 02:28.600 --> 02:35.620 Okay so I can see there that when the factor is at zero this top one is 100 percent. 02:35.680 --> 02:41.670 And as we go down it gets less and less and less and eventually becomes black which is zero. 02:41.680 --> 02:46.250 So that means it's got nothing of this one and 100 per cent of this bottom one. 02:46.270 --> 02:51.220 So with that in place Let's disconnect that for a moment and play with the other one that's this one 02:51.220 --> 02:52.690 in and see what happens. 02:52.690 --> 02:57.840 So again with it's at 100 percent of the bottom one here it's black. 02:57.840 --> 02:59.200 There's nothing going on. 02:59.270 --> 03:01.890 And if we move it all the way this way. 03:02.740 --> 03:06.820 It becomes all black and white still so we still got the alpha channel plugged into the colour let's 03:06.840 --> 03:13.270 read link the colour to the colour so we can see what's going on so we can see here it goes from 100 03:13.300 --> 03:18.430 percent the image itself all the way down to nothing because there's nothing plugged into the bottom 03:18.430 --> 03:18.800 one. 03:18.820 --> 03:24.240 So let's go ahead and plug in the transparent shade and see what happens. 03:24.250 --> 03:26.650 So let's move this backwards and forwards. 03:26.890 --> 03:34.070 So we can see we're going from 100 percent of the diffuse to a hundred percent of the transparence. 03:34.210 --> 03:37.550 That's not quite what we want to do. 03:37.810 --> 03:40.220 Let's try these round the other way. 03:41.090 --> 03:45.650 And moving them up and down that won't replug them in looking going to swap these round here and see 03:45.650 --> 03:47.420 what that does it swaps it around for us. 03:47.540 --> 03:53.100 So we go to 100 percent of the transparency to the image itself. 03:54.010 --> 04:00.910 Okay that's starting to look better but we need to control this not on an overall scale but on a pixel 04:00.910 --> 04:02.610 wide pixel case. 04:02.650 --> 04:08.800 Now what we can do is we can use this alpha channel which we've already seen creates a mask a black 04:08.800 --> 04:09.810 and white image. 04:09.820 --> 04:10.840 That's what it looks like. 04:10.840 --> 04:17.680 So if I plug the alferd channel straight into one of these shaders and remove that then we can see here 04:17.710 --> 04:23.530 that the alpha channel itself just gives black and white how we can use that to control because it's 04:23.530 --> 04:26.830 a great node it's output in a value for every single pixel here. 04:26.980 --> 04:33.000 We can use that Alpha channel here to plug in to the factor. 04:33.070 --> 04:34.000 Excellent. 04:34.000 --> 04:40.060 Let's remove it from the shade of air and let's link these back up and see what effect we have. 04:40.060 --> 04:43.240 Right that doesn't look quite right at the moment. 04:43.240 --> 04:45.490 Let's try reversing these round. 04:45.490 --> 04:48.140 So let's put the diffuser on the bottom. 04:49.030 --> 04:50.020 Ah ha. 04:50.200 --> 04:50.770 Brilliant. 04:50.770 --> 04:52.510 That's looking much better. 04:52.510 --> 04:54.100 It's completely transparent. 04:54.100 --> 04:59.760 I think I'm going to move over the top of this one here and lift it up. 04:59.920 --> 05:00.430 Excellent. 05:00.430 --> 05:02.950 So we're seeing straight through it. 05:02.950 --> 05:05.490 That's absolutely brilliant right. 05:05.490 --> 05:11.020 So now we've got a nice little set up here with these three areas here. 05:11.110 --> 05:15.670 We've got these two shaders being plugged into a mix shader And that's. 05:15.670 --> 05:19.960 I'm just going to reorganize it here to make it look a little bit better. 05:20.020 --> 05:20.530 Yes. 05:20.890 --> 05:22.270 Lines crossing over everywhere. 05:22.280 --> 05:24.450 I think I'm going to be able to avoid that that easily. 05:24.480 --> 05:30.190 But what we can do now is we've got essentially a system we've set up a series of nodes here to do a 05:30.190 --> 05:34.000 task and that is to make a background image transparent. 05:34.000 --> 05:38.830 Now if you had hundreds of images that you would go to do this too you'd want a quicker way of doing 05:38.830 --> 05:44.740 it without having to add to shaders to your defence one that comes automatically. 05:44.740 --> 05:46.610 And we can do that by grouping. 05:46.690 --> 05:52.560 So holding down shift I can select the others in our group that we want to make. 05:52.660 --> 06:00.790 When I go down to node I can go to make a group and we can see here its control and G. 06:01.090 --> 06:08.140 Now when we go into the group we can see it's got a group inputs the actual shaders themselves and the 06:08.140 --> 06:09.550 group outputs. 06:09.550 --> 06:18.310 Now it's very important that you tend not to put in input nodes i.e. this image texture or output nodes 06:18.730 --> 06:20.960 with in a group itself. 06:21.340 --> 06:26.320 Now in order to get back we can tab out because that will go between the two screens. 06:26.320 --> 06:32.620 However what you can do is put the groups inside groups and if you do do that you can't just tab out 06:32.620 --> 06:34.880 it or take you to the next level down. 06:35.050 --> 06:40.240 And on the header bar of the know this this little up arrow so it would not use nodes. 06:40.240 --> 06:45.610 Take a little drawing pin and then this bakara And that will also take you up a level which is brilliant. 06:45.610 --> 06:48.720 Now this looks a lot better. 06:48.850 --> 06:53.600 Its much more clean with back down to three nodes so its easy to see whats going on. 06:53.770 --> 06:58.750 Now as you can see there's little arrows next to the names of these groups that you can collapse down 06:58.750 --> 07:02.830 if necessary if it starts getting really busy very useful. 07:03.070 --> 07:07.610 And of course what you can do isn't named this node group. 07:07.610 --> 07:09.630 Some think more useful. 07:09.670 --> 07:15.940 So if we open up our properties and we can see it's called node group and I'm going to be calling It's 07:16.000 --> 07:21.340 trans make image essence. 07:21.340 --> 07:24.780 Now I have named it when I needed it to use it again. 07:24.790 --> 07:32.170 I can go down to add and go to search and I can go make Inish transparencies actually now in the file 07:32.200 --> 07:37.090 and I can use it again and again and again if I bring this up make image transparent. 07:37.090 --> 07:37.980 There it is. 07:38.050 --> 07:42.040 And we can open that up and see that ARG group still exists. 07:42.100 --> 07:43.100 Brilliant. 07:44.400 --> 07:46.800 Okay a bit of a transition there. 07:46.830 --> 07:51.750 I am Michael from the future and I'm here just to make sure that you guys are fully informed. 07:51.750 --> 07:57.870 We've had a couple of questions and hopefully this will help clear up and give you guys further knowledge. 07:57.870 --> 08:00.110 I've started a new blender file here. 08:00.180 --> 08:03.470 I'd like you to do the same Make sure you saved your work. 08:03.750 --> 08:07.220 And we've got the default cubin so now we're going to get rid of that. 08:07.680 --> 08:10.470 Hit the x key and delete. 08:10.560 --> 08:13.270 Now that's gone instead of going add. 08:14.370 --> 08:17.150 We scroll down just a little images as planes. 08:17.160 --> 08:21.330 This time we're just going to have a simple plane right at the top. 08:21.330 --> 08:22.380 There we go. 08:22.830 --> 08:25.050 Okay now we have the plane in the sea. 08:25.050 --> 08:30.040 We're going to was sign everything manually and see how that comes across. 08:30.060 --> 08:32.080 So I'm going to have to create a new window. 08:32.100 --> 08:37.760 I'm going to make the tool shelf and propertys panel disappear and drag a new window so we can see what's 08:37.770 --> 08:38.700 going on. 08:39.030 --> 08:46.020 I'm also going to switch this view ports on the left over to rendered mode. 08:47.090 --> 08:50.960 And it goes that's rendering ready to go on this side. 08:50.960 --> 08:56.480 We need to first of all give this material we don't have a material just yet. 08:56.480 --> 09:01.240 So let me pole open the propertys panel and go to materials. 09:01.370 --> 09:03.120 I'm just going to click on you. 09:04.120 --> 09:05.760 It's got materials 0 0 1. 09:05.770 --> 09:07.810 Let's call this grass. 09:08.650 --> 09:09.540 There we go. 09:09.910 --> 09:13.780 Now I'm just going to make that disappear a bit more so we've got some room here. 09:13.780 --> 09:19.690 We're going to switch this viewport across to a different view point we're going to go to the node Ed. 09:19.920 --> 09:21.380 And where we've been before. 09:21.400 --> 09:22.870 Now we're going to have to build this up. 09:22.870 --> 09:26.130 Bit by bit we know all the components that we need. 09:26.230 --> 09:28.770 But there is one extra. 09:28.840 --> 09:29.650 So what do we need. 09:29.650 --> 09:33.640 We need to diffuse shader we need a. 09:33.750 --> 09:38.530 And before I go and add this in if you do want and little micro challenge pause a video and see if you 09:38.530 --> 09:41.030 can populate the other bits that we need. 09:41.810 --> 09:43.980 If you've done that great Welcome back. 09:44.030 --> 09:47.810 Now are we going to need a mix shaded to mix these two together. 09:47.810 --> 09:51.760 We are also going to need a. 09:52.190 --> 09:54.770 That's right a transparent shade. 09:54.980 --> 09:59.330 I'm going to put that transparent on top because it's going to plug into me top. 09:59.790 --> 10:02.110 Oh I put that in the wrong place. 10:02.120 --> 10:07.040 I'm looking at the wrong part of the screen that's linked these back up so we've got this coming through 10:07.040 --> 10:07.430 fine. 10:07.430 --> 10:12.370 And we needed to control the fuse by an image says go ahead. 10:12.370 --> 10:16.610 I'm going to use the menu this time and actually search for image. 10:16.610 --> 10:18.750 There we go image texture. 10:18.800 --> 10:23.610 Plop that in there and we're going to link the colour into the colour here. 10:23.720 --> 10:27.590 And the Alpher into the factor that looks good so far. 10:27.590 --> 10:30.140 Now it's gone pink over on the left hand side. 10:30.150 --> 10:32.810 And that's because it doesn't have a texture. 10:32.920 --> 10:38.480 So the kind of standard colour when it doesn't know what to do we go ahead and open up a texture and 10:38.480 --> 10:41.480 I'm going to go to where I've stored my assets. 10:41.690 --> 10:47.820 Now at the top of the head were beheaded bar basically for the file viewer. 10:47.840 --> 10:52.640 We've got these thumbnail views and this is a great way of having a look at these are done which will 10:52.640 --> 10:53.470 I'm going to pick. 10:53.470 --> 10:57.160 I'm going to pick grass blade 7 for this example. 10:57.940 --> 10:59.640 And we can't see anything. 10:59.650 --> 11:02.980 And this is set up exactly how we had it before. 11:03.220 --> 11:10.630 But there's one thing that the insert images Plains is doing which even though it looks the same is 11:10.630 --> 11:12.130 slightly different. 11:12.130 --> 11:18.980 Now at the moment we're not explicitly telling blender how to map this image to that plane. 11:19.000 --> 11:22.140 Now to you and I it's obvious it can only exist one way on that plane. 11:22.150 --> 11:28.030 Perhaps if you rotated it round but essentially it's still be the same blender needs a bit more help 11:28.030 --> 11:30.590 than that so we need one more note. 11:30.970 --> 11:38.470 So let's go ahead and add in is a type of inputs because we're telling blender information and it's 11:38.470 --> 11:40.660 called a texture a walnut. 11:41.730 --> 11:45.750 If we go ahead and put that in there at the moment we can't see anything. 11:46.590 --> 11:52.810 And we don't have many of these other options available you'll see here there are lots and lots of options 11:52.830 --> 11:58.160 generate normal uv's object camera window and reflection by all means play with those. 11:58.170 --> 12:02.510 But since we have a very simple plane it certainly doesn't need unwrapping. 12:02.640 --> 12:09.310 We can get away with using generated if we link up the generated to the vector. 12:09.330 --> 12:12.150 Suddenly our grass will appear. 12:12.150 --> 12:17.670 So if you go through manually you may have to put this texture coordinate in as well. 12:17.670 --> 12:23.010 Or indeed if you alter something or give it a different type of mapping you may lose that. 12:23.010 --> 12:29.190 This is done automatically when you add images as planes even though it doesn't look like it does in 12:29.190 --> 12:30.270 the node editor. 12:30.450 --> 12:32.330 So a slight subtle difference there. 12:32.370 --> 12:35.550 And of course now it's time for a challenge. 12:36.370 --> 12:42.670 I would like you to apply transparency so make your three shaders into a group if you've not done already 12:42.870 --> 12:50.590 and then apply transparency to the other P N G files you have imported using the group you've just created. 12:50.890 --> 12:54.130 So I'd like you to pause the video now and give that a go. 12:55.930 --> 12:57.610 OK guys welcome back. 12:57.610 --> 12:59.940 Let's hop straight on over into blender. 13:02.910 --> 13:08.430 Okay so now that we are back over in blender I'm going to go up a level and I don't need this one here 13:08.480 --> 13:11.470 I was just the demonstration so I'm going to get rid of that. 13:11.530 --> 13:15.530 Some are just going to grab this other image and move it. 13:15.540 --> 13:21.000 And you'll notice there it doesn't look the same as it does usually and that's because I've got my pivot 13:21.000 --> 13:27.240 points at the 3D Curson was going to send it back to medium point and then it sits on top of the origin 13:27.240 --> 13:27.750 itself. 13:27.750 --> 13:29.000 Brilliant. 13:29.070 --> 13:35.700 Now that that's there we can select the other image how we're going to get rid of this diffuse STF because 13:35.790 --> 13:41.580 that's built in to our module that we've created that we can just drop straight in some of the leite 13:41.590 --> 13:46.790 that's an I'm going to go to AD search and making farraj transparent. 13:46.790 --> 13:48.550 Brilliant and pop it in. 13:48.650 --> 13:56.060 Oh you can go colour into colour and Alpha into a factor and then shape that onto a Surface. 13:56.820 --> 14:00.890 And that should have worked and why hasn't it. 14:00.900 --> 14:06.840 Let's dive in and have a look through what the facts are coming in and across here we've got the transparent 14:06.840 --> 14:10.920 on top and this on the bottom and it goes to an output. 14:11.070 --> 14:15.790 So let's just make sure everything is working as it should be. 14:15.930 --> 14:18.490 Let's go and compare it to the previous one. 14:18.510 --> 14:21.260 So you've got the grass image here it coming in. 14:23.380 --> 14:28.970 And we can zoom out here transparent tops all of this seems to be absolutely fine. 14:28.970 --> 14:33.350 Question is why is that not showing it's as transparent. 14:33.350 --> 14:35.380 And here is the problem. 14:35.420 --> 14:43.670 I haven't selected use Alpher cellmates that's now ticked and sorted and I'm going to set the Alpher 14:43.670 --> 14:46.440 to pre multiplied here. 14:46.710 --> 14:53.950 They do look very similar but pre multiplied tends to be better with small edges that change rapidly 14:53.960 --> 15:01.250 much like these seeds we've got at the top here and the way the grass moves quite rapidly and it's quite 15:01.250 --> 15:03.670 thin so we want the best quality possible. 15:03.770 --> 15:10.700 So armed with that knowledge over on this one I'm going to select my image texture the user helfer is 15:10.700 --> 15:14.190 already applied to its Which is excellent. 15:14.300 --> 15:23.270 I can delete the diffuse shader add in a source while search for my make image transparence and when 15:23.270 --> 15:24.440 I plug this one in. 15:24.470 --> 15:26.830 It should work without issue. 15:29.700 --> 15:30.750 There we go. 15:30.780 --> 15:31.890 Perfect. 15:31.890 --> 15:33.330 How did you guys get on. 15:33.330 --> 15:35.540 I'd love to see your transparent grass. 15:35.550 --> 15:39.850 Do share it in the discussions and I will see you in the next lecture.