Is it potentially a texture issue? You mention it only happens when something is close to an edge, which is where I typically see repeated texture issues. I posted my solution here: Why does this texture wraparound issue happen? - #2 by matijaerceg
Is it potentially a texture issue? You mention it only happens when something is close to an edge, which is where I typically see repeated texture issues. I posted my solution here: Why does this texture wraparound issue happen? - #2 by matijaerceg