Glitch when moving camera in OpenGL

Answer 1

My first guess would be floating point rounding error. This could cause the co-ordinates for your quads to be just a little bit out, resulting in the gaps you see. to verify this, you might want to try changing glClearColor() and seeing if the gaps change colour with it.

One solution to this would be to make the tiles slightly larger. Only a very small increment is needed (like 0.0001f) to cover over this kind of error.

Alternatively, you could try using a Vertex Array or a VBO to store your ground mesh (ensuring that adjoining squares share vertices). I'd expect this to fix the issue, but I'm not 100% sure - and it should also render faster.

Answer 2

Sometimes this is caused by filtering issues on border texels. You could try using GL_CLAMP_TO_EDGE in your texture parameters.

Answer 3

Its due to filtering.. use clamp to edge AND leave a 1 or 2 pixel border.. this is why we have an option for BORDER in glTexImage call..