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In this video, as part of making our texture library, I will demonstrate how to make corrugated metal such as we can see in this rusty barn here. A surface like this is useful in a lot of ways. As well as the barn we have, I can also use this on warehouses in a city, let's say down by the docks. I can use it on an army base, standard issue army base games, zombies running around, etcetera. I can use this on tropical locales. maybe we need metal roofs on structures. So having a corrugated metal in library is pretty valuable.
The trick with it is to recognize the wear and dirt and rust patterns as different from the metal itself. Corrugated metal when it's clean looks like this. This is galvanized. We can see this flaky fractal pattern is the galvanization intended to keep it from rusting. I have collected reference images of different kinds of metal in different states of rusts. We can see a difference in the corrugations and also a difference in the way it rusts in each one. more streaky and along the corrugations and really flaky and bumpy here.
It's always important to start out with reference. We can't just imagine that. We need pictures of what does this material look like and this is fairly common. To begin, I am going to start out a new document by pressing Ctrl+N. I am going to make this texture 1024 square. I'd rather paint big and then reduce down later if needed. Textures are usually in a power of 2 and square, so 1024 is one of those. If you like, you can save a preset. I am going to save my preset and leave the name at 1024 Square. I am going to leave this as RGB, White, and 72 pixels per inch, which is a standard for working on screen.
In this new document, the first thing I'll do is lay down my corrugation. I'll press M for Marquee and change my Marquee to a Width of 16 and a Height of 1024. I will land this marquee anywhere really on screen and zoom in on it so I can see it across the width clearly. I'll change my colors here, picking a white or near white for my foreground, and leaving my background at somewhere in a middle gray. Then I'll go to my Gradient tool, pressing G, and in the Gradient choose Reflected. I will start in the middle of this selection, click and hold Shift while I drag to keep the selection running straight.
There is my gradient across that. One corrugation. When I zoom out, I have a thin line with a gradient on it. I will go to Edit > Define Pattern. I'll call this Corrugation. Now I can deselect and then press Ctrl+A to select my whole document. Then I will press Shift+F5 and under the Fill dialog where it says Use, I will drop-down and pick Pattern. In my patterns, I'll pick my Corrugation pattern.
Now I have my document filled with even corrugations. I've got the right rhythm going. Now we need to add the chips. I'll press Ctrl+D to deselect and double- click on my background layer and rename it. I'll call this one Corrugation. I need a new layer but first I need to generate some chips at the right size. Remember that from previous lessons, render clouds always generate at the same size regardless of the document size. So I want more clouds in order to have more chips spread evenly.
I am going to make a new document by pressing Ctrl+N and I'll make this new document 4000 pixels square. Now I will fill this new document using clouds that go between a light gray and a medium gray. I will set the foreground color to a light gray and the same one for the background is fine. I will choose Filter > Render > Clouds and now I have a lot of clouds in my document. Now I'm ready to crystallize. I will zoom in so we can see it, and choose Filter > Pixelate > Crystallize.
I am going to crystallize this first at a size of 10 or so. Now I'll crystallize once more at a smaller size, choosing Filter > Pixelate > Crystallize and running a size of roughly half. Now I'm ready to take this document and downsize it and apply it. I'll go to Image Size by pressing Ctrl+ Alt+I and changing the Width to 1024. I will make sure that Constrain Proportions is checked if it's not already, so that the width and height change together.
There is my document with my crystallization. I'll select all by pressing Ctrl+A, Ctrl+C for Copy, and into my other document with my corrugation I'll paste this by pressing Ctrl+V. I'll take this layer, zooming in to check the crystallization. It looks pretty good. I've got some good fractalization going and I'll set it over the other layer as a Soft Light. If this isn't show through well enough, I can always change the blending mode. In this case I might try a Multiply.
Now, I start to get some phasing and chipping or crystallization on my metal as well as a nice blotchy pattern. I can adjust this later if needed. Now we are ready to add the rust. I'm going to do this on a new layer again, pressing Ctrl+Shift+N and naming the new layer rust. For the rust, I'm going to paint with a big soft brush, setting my foreground color to a good rusty orange. I will press B for Brush and Brush with an Opacity of 10 or 12 and a Multiply mode.
That way, as I add the rust on, I can put everything from a gentle skim of rust to some hard splotches by brushing over and over in the same place. It's important when you're painting textures to not paint at full strength. We don't want to just smear a big color on. As part of this, I may want to zoom out, pressing Ctrl+Minus or using the Zoom tool, and I'm trying to get my rust fairly even across here. I want this to be old rusty, pretty well denigrated. That's pretty good. I can always adjust it later.
I'll take this rust and set its blending mode over as a Color Burn. That's going to intensify that rust across here. I may want to reduce the Opacity just a little bit. I will pull it down to 60. Additionally, I may need to reorder my layers, moving around the flaking and corrugation to put them in the right direction. In each of these I am going to play with the blending mode, making the corrugation to Soft Light, and possibly switching the flakes to Normal and then taking the rust and trying other alternatives and if Color Burn doesn't look right, I'll try it as a Multiply.
When you're building textures like this, play with it. There's not one right way. I've got some good blotching going on, I've got rust across it, and the final thing I need to do is to add-in some panel joints. For this, I am going to use a fixed size marquee. I will select by Marquee tool and on Width I will put-in 256 which divides evenly into 1024. I'll land my marquee first on the left side and choose my Eraser tool by pressing E. I will erase mostly outside, just lightening the edges of the panels ever so slightly.
Then I will grab a guide, drag it across and snap it to the marquee, and repeat the process. In the interest of time, I am going to do this three more times and then show that final document. I've added the panel joints into my corrugated metal. I've also adjusted using the Brightness and Contrast, the cloud layer, so maybe it's a little less visible or obvious. I can come in and add any other rust now and bulk out any textures I need or erase any parts and redo any parts that look wrong. My corrugated metal is ready to apply.
I can put in additional details such as screw joints or other pieces as needed. But this is a good base for my texture library. I can use this in a variety of places.
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