Frisket said:
Oh! You mean the tiling effect! Well, there's two ways to fix that. 1) You can make a large texture that stretches well. 2) You can make a texture that tiles well. I personally would just stretch the texture, since that would be easier from the texture design standpoint. I'm not really experienced with texture design, but you could mirror one side to the other(i.e. the right with the left) and then make it look good when you mirror it. The real secret is making the edges match. That's how you're gonna get a good looking sky.
Depending on the type of sky we're talking about, simply using it without tiling may not be an option. For example, if you want to have texture panning on, then it needs to tile seamlessly. I don't know jack about making textures, but one thing I'll point out is that Photoshop (at least the version I'm using, 7.0) has a filter called "Offset" under Filters -> Other that shifts your image down and to the left a certain number of pixels, and wraps it around the edges. So if you've got a 512x512 texture, you could offset it by 256 in each direction, which allows you to see how the edges of the texture align:
->
In this view you can do whatever you have to do to get those sharp seams out. Then apply the Offset filter again to shift the image back to its original position, and you have a seamless texture. Of course I can't tell you much about
how to get rid of the seams; this is just a useful tool. If you don't have Photoshop or another editor that does this for you, you could always just rearrange the parts of the texture manually for working on the seams.
