So, it looks like not an issue with your particular settings after all, but an issue with the old shaders (which are indeed pretty old and haven't really been updated since the initial release). I highly suggest that you and *all* other Mtree active users get the Addons installed which include newer and better shaders, and to see if you can find settings with the newer shaders that fix these issues! https://github.com/danwipf/MTree-Addons/ Once again, all these Addons are intended for addition in the new release as soon as Maxime gets some time to help us integrate them officially. This is absolutely impossible to do if your tiling is not a whole number. Think about it: If your texture is cut in half or a quarter it's not seamless anymore. Much as I know this isn't the answer you probably want, there's nothing wrong with the current UV's - Mtree UV's are set up to be as seamless as possible if your textures are seamless. If they are not seamless, or if your tiling is not a whole number, there will be seams. This isn't a problem with the MTree technology or our UV's; it's simply how texture tiling works. You'll generate seams on most Unity objects if you don't use whole-number tiling (unless they're doing something very advanced). I get the sense you turned the tiling down to half because you want the texture to look "bigger" on your trees from a distance? You're going to have to generate a seamless texture at the right size if you truly want to have that look with no seams - take the one-quarter of the texture you're using (that's what 0.5, 0.5 tiling is, after all) and make it into its own seamless texture: https://creativepro.com/creating-seamless-textures-in-photoshop/ These are great ideas, but also very advanced ideas and really not feasible for us to undertake in the next version or two. We're a small "team" right now and dan and I are unpaid volunteers on this project. However, we are also a project that absolutely wants to support user contributions to MTree (that's how dan and I got started!) and if *you* want to research these things, I encourage you to join the Discord for the project and we'll chat! https://discord.gg/fC6kt5 Many things might be more possible if Maxime is able to meet with us soon and/or allow us to become official publishers on the package!