I've found some results on the search page, but none of them explains how to do this effect on 2d toolkit.
I've done the following. Created 2 tk2dsprite with the same sprite in it. I moved the second to the right side of the first and I keep moving the two of them at a constant speed to the left. When the first move off the left bounds, I move it to the right side of the second sprite. When the second one moves away from the left bounds, it moves to the right of the first sprite. And there you go. Theoretically, it works, but I keep getting a thin, perceptible, ugly line between the two sprites.
Is there a more "right" way to do it? Or another way that has proven to work? Thanks.