The best (as far as I know) way to make a seamless tile is to overlap a tile with itself, and quilt the images together where they overlap, although I am not sure which plug-ins you could use to do this (if you know, please share in the comments!) It uses a overlap-and blend method, which only works well on certain types of textures. Gimp’s algorithm (used below) is not very good. You should preprocess the texture in the same way as you would making a seamless rect tile. The quality of the end results depends on properties of the base texture you use, and the quality of the algorithm you use for the step where you make the images seamlessly rect-tileable.Once you have the method down, you can try it on proper textures. It’s tricky to get all the steps right, and using a more structured image will help you find problems faster.You will also be able to compare the dimensions of the image with those given below for each step. When you use one of these methods for the first time, use an image like the second one (and use the size 1024×1024) to go through all the steps.I give two examples for each method. The first image is an actual candidate for a tileable texture the second one gives more insight in how the method works. The original methods was also given for hex tiles that fit in a square the methods below are for regular hex tiles. With the original methods, the textures are stretched or rotated in the final result. I adapted the methods below from Turning Square Tiles into Hex. The methods use any method that can be used to make rectangular tiles that will tile seamlessly, such as the standard filters that come with Photoshop or Gimp. In this post I give two methods for making hexagonal tiles that will tile seamlessly.
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