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Resizing a Seamless Texture
Most, if not all paint programs have a resize function, or a scale function, or whatever. While these are fine for most things that you'll need to do graphically, they aren't so good for textures. The problem with resizing a texture is that you need to make sure that the texture remains seamless when you do so, and most programs are not built for this purpose. Most programs will actually factor in the edges of the area for some reason, and so when you resize – your nice seamless texture all of a sudden has seams.
The first thing I'm going to do is load a texture that I want to resize. In this case, we're going to use a 1024x1024 texture, and we're going to resize it to 512x512. So, let's load our texture. In this case, we're going to use Photo Shop, although almost any paint program will be sufficient. |
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| Next, I'm going to resize the canvas. This actually DOES NOT resize the image, but instead creates a larger area to work with. We're going to DOUBLE the area size both horizontally and vertically, so my total work area will now be 2048x2048, which is actually FOUR times the original size. |
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| Photo Shop automatically chooses to resize the canvas from the center. We're going to change this to the upper left instead, to make things easier. Your work area should now look something like this: |
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| Next, we're going to copy and paste our texture, being careful to line it up with each of the other three corners. |
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The end result will look like we've repeated the texture. This is EXACTLY what we want. Mind you, if the texture isn't seamless to start with, this won't work for you. You did read the title of this tutorial, right? Okay, just checking
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NOW we're going to use the IMAGE resize function. This actually changes the size of the image, not just the work area. We're going to make the image HALF the width and HALF the height of it's current size. Your total image size should now show the TILED texture at a size of 1024x1024. |
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Next, we need to select an area in the MIDDLE of the image that is exactly 512x512. So I'm going to pick my selection tool, constrain the size to 512x512, and plop a box right in the CENTER of the image. |
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Photo Shop works in layers, so if we want to copy this properly, we either need to flatten the layers or choose the “copy merged” function under the edit menu up top.
NOW, we've finally got our image copied. Create a new file, set the size to 512x512, and paste it in there. In Photo Shop we can use the OFFSET FILTER to get our texture lined up right. Most paint programs have something very similar, and some(such as Zbrush) even let you move it around in real time and will wrap it around to the other side for you. |
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Alright, DONE. Let's save this sucker and take a look at our handywork. Notice that there are no seams, even though there would have been if you'd just resized the image in the regular manner.
Chances are, you already realized that, or you wouldn't have bothered with this tutorial, right?
Good luck and happy modeling! |
All Contents of this tutorial are Copyrighted and owned by the original authors. Please do not copy, steal, deep link, etc.
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