the ball unverse is new prop with relaxed UV's so your textures will looks perfect but not simple to do... but you can use also very low textures minimum 1000x1000 and scale it down too to get perfect effect with low textures, you need to create tiled textures for the ground and the sky ball.. the ground textures you see here will included too so you can see how to scale your own down to get the best effect..

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