YGYL, thanks for your tests [:)]

1.fonts in 3D display too Fuzzy,Especially when a large text size.

The text is managed in 3D with a texture image that contains the text and is 512 pixels wide at max. I could use a larger size but fear loss of performance...
But if needed this trick is still working.

2.Background coordinates plus or minus is wrong .

No, it's correct. X and Y are the coordinates of the origin of the plan in the image, not the coordinates of the top left point of the image in the plan. If the Chinese translation of the wizard isn't correct, feel free to propose a better one.