So in this chapter we're going to begin to look at the various different ways that we can filter our inputs using Substance Designer. Now to start with we're going to come over here to File, New and we're going to Open a New Substance. And by the way, notice that the keyboard shortcut for this Control N. When we're working here in our un, Untitled Graph, we want to make sure that we're going to see our Connector Names so just make sure that you have Display Connector Name Enabled here for this particular graph. And we're going to want to bring in a Base Element here so that we can start as our input. I'm going to come over here to Base Elements, come down to Noises and then I'm going to choose something like Clouds and just drag that right in like so. If I double-click this then this will be computed so that we can see it. We're not going to need the 3D View so I can just go ahead and close that for right now and I'm going to go ahead and scroll up like so, that so we can see everything that's going on within our 2D View. Now if I haven't mentioned it before, when you're working within the 2D View, if you click in the background of it and then use the Spacebar, you can see the tiling of all of this. So this can be very useful for just getting an overall view of how this is going to tie up. I'm going to hit the Spacebar again to go ahead and turn off that Tiling View and what I want to do now is I want to go ahead and bring in some nodes. Now the thing I want to do, when I'm thinking about bringing in nodes is to look at the two different ways that we can do this. So the first way is we have nothing selected and we hit the Spacebar, we can choose our Gradient Map Node which is what, the one that we're going to look at right now. And by bringing this in, you can see we have a primary input of gray scale and an output of color. And all we need to do is just click and drag to connect that node to this and then double-click and now we're working within our Gradient Map Node. Now if we want to do this a little bit faster, what we can do is, we can hit Delete on that, come over here select a node that we want to start with, hit the Spacebar and then come over here and choose our Gradient Map Node. And it will automatically connect for us and if we double-click this, now this is calculated. The basic functions of the Gradient Map Node are all going to be set by whatever the input was. So if we come over here you can see it's all set to Relative to Input. If we want a specific value here we can set it for Absolute but generally speaking all these parameters right now are set Relative to Input which means that whatever the settings were here are just going to be carried on to here. Now below that we have specific parameters and there's two specific parameters that you need to be aware of. The first one is Color Mode True or False, so if we're looking to have a color output, we have true. If we're looking for a gray scale output, then say false and you'll notice that our output changes to gray scale, this can sometimes be useful. The other here is our Gradient Editor, so we're just going to come over here click the Gradient Editor Button and now we're going to begin to look at the Gradient Editor Function. Now this is fairly complex but it's based on some of the stuff we've already looked at with the Color Picker. Basically the idea here is that this gradient that you see here, represents 100, a position of 100 would be 0 to 100 on this gradient. And right now, everything that's within this image is mapped to that gradient. If we start to change this gradient, then we're going to see changes in the image, so I'm just going to go ahead and move this up a bit so that we can really see what's going on here and just keep your eye on this image in the 2D View. So I'm just going to go ahead and click on the Gradient to add some keys like so and what I can do is, I can say okay, I want to add a dark value there and maybe I want to add a light value here. And you can see how dramatically that gradient is changing the noise that we had to begin with. This can be a really fantastic way of modifying but we don't have to work with just gray scale. We can also choose colors, so if I click on this key and I say okay, I want to add like a red, you can see we can start to do some very complex gradient mapping to make some different types of things happen with our basic noises. And this can be very, very powerful. Now if you want to get back to the previous color, you see here, we have the current color and then we have the previous color. If we just double-click on that, it'll change it back to the previous color. If you come over here, you'll notice that since we clicked off that one, we don't have the previous color available to use anymore but if we click onto a different color, you can see we can get back to that previous color as long as we're still working on that particular key. The position of this key right now is set down here and this is the numerical version so if I move this around, you can see the numbers are changing. So I can put in whatever number I want. If I wanted this key to be at say .1 which would be 10, I just hit Enter and boom, there it is, it's at .1, If I wanted this to be at 50 percent, I could just type in .5, hit Enter and now it's 50 percent. So we can have precise control over where this is in terms of it's position within the gradient. Up here we have some buttons, you can see we have Desaturate, Invert Positions, Invert Colors, Interpolate and Clear All. So first of, let's look at Invert Positions, this is basically going to flip our gradient around, so I can just do like that and then of course you can see how that was reflected in our 2D View down here. We could also say Invert Colors and what that'll do is it will invert all the colors to their exact opposite and of course you can see how this is reflected within our 2D View. And then we have Interpolate, now this is basically going to change the way in which these gradients are occurring. This is more or less going to be working on more of a curve instead of having the linear gradient, it's going to be more of a curve type gradient and it just looks a little nicer to me, but you can choose whichever way you want it to be. Now down here, you see that we have Gradient Eye Dropper and we have Noise and Precision. Well what these are doing here is that they're allowing us to work with this Pick Gradient Button. So the idea with the Pick Gradient Button is we can come over here, click Pick Gradient and then we can click and drag within the User Interface and we can pick up any gradient that we see. So I could say, Pick Gradient again, come over here and boom now I've got that gradient and this Noise and Precision basically reflect how this is going to pick that gradient. In addition to that, if I say Clear All, it's just going to clear everything back to it's standard black and white status. If I come over here and I start picking colors, like so and I say well, I want that value but I don't want the color, I hit Desaturate and that will change it to a gray scale value which can sometimes be useful. In addition to that, we also have all the standard options that we have for our Color Picker. So we have our RGB, Hue, Saturation and Value and Alpha and we also have our Pick Invert to Gray and Copy and Paste. And here the Copy and Paste is actually more useful because in this particular instance maybe we want, we want to copy that color. So I'll say Copy, then maybe we're going to come over here and we're going to go ahead and put a key there and then we're going to say Paste. And now I've got that color pasted over here, so that can be a lot more useful than it was in our regular Color Picker. Now if we want to get rid of any particular key, we can simply click and drag off and it will disappear like so. However, if we want to, for whatever reason, be more precise, we can click on it and then click the X Button and that will get rid of that key as well. So as you can see here, it's a fairly complex dialog but with a little bit of playing around, you'll find that you can do some really amazing stuff with this Gradient Editor. Now the Gradient Map Node also has a basic function which is used an awful lot when working within Substance Designer and that is to convert a gray scale image into a color image. And sometimes you'll bring a Gradient Map Node in for no purpose other than simply just to convert from gray scale to color.
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