I've got a skybox consisting of 6 GL_QUADS.

The quads are arranged in a cube, so the distance is all the same. The texture coordinates are (0,0), (0,1), (1,1), (1,0). Even so there is some kind of gap between the seperate quads. glTexParameteri(GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_EDGE); did not help anything, neither WRAP_T or both.

You can see it on the screenshot.