Why are there lines on the edges of some of the tiles on my 2D tilemap?

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I am generating a flat mesh and setting the UVs to correspond to a tile in a tileset png file that I have set as an Advanced Texture.

Screenshot showing issue (left is unity game, right is map editor): http://i.imgur.com/CIbINof.png

Texture settings: http://i.imgur.com/CFft9Te.png

Most issues I've found that have a similar problem just say to set the Filter Mode to Point. As you can see, I have it set to that. Anyone have any idea why those lines are appearing between tiles? I wonder if it is because the tiles are very small (32x32 pixels) and the floating point texture coordinates aren't accurate enough to pick out 32x32 pixels from the tileset image?

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Answer by steakpinball · May 07, 2015 at 04:58 PM

Normally when working with tile maps in Unity there needs to be a small gap between each tile in the atlas. This is because Unity uses a 3D renderer, which isn't 2D pixel perfect. A particular tile bleeds into the neighbors when rendered. Many atlas generators have options for spacing, padding, or margins. For example, TexturePacker calls this option "Shape Padding."

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Why are there lines on the edges of some of the tiles on my 2D tilemap?

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