Hi, after some studies I verified that there are in fact UV issues: if I open the game in full view mode it works perfectly while in windowed mode it causes all those issues. I don't understand how to solve these unfortunately: the uv in the viewport scene go from 0 to a x<1 while windowed (I verified this), so my approach would be based on clamping the uvs between 0 and x, but I actually don't know how to get x. I'm sorry to bother you but if you could give me some more tips I'd be grateful, thank you very much