tiling texture on multiple planes

I have tiled a background image on my game by instantiating a new plane every so long. There is a vertical line where the planes meet with eachother. The problem is not that I am instantiating it in the wrong place because I’ve already checked that. How can I fix this?

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Don’t do it like that. You can’t depend on the vertices being in the same place; floating point imprecision is bound to crop up. Instead, use a single mesh. If you’re working with a single vertex, you can’t have that sort of inaccuracy.