Ug, why does the apparent rotation have an angle?

This depends on the user's settings when operating the software.

UG is a three-dimensional design software, and users can view the shape of products from different angles by rotating the view. In UG, the view rotation function is turned on by default, and users can control the rotation angle by clicking the view rotation icon or using shortcut keys. By adjusting the rotation angle, users can better observe and analyze the appearance and structure of products.