A function that selects the base model, which will be used for transformations, particle texture, GUI light, etc.
Angle (in degrees) between the book cover and the centerline (0 means closed, 90 means open flat).
0
90
The position of the first page inside the book. 0 means the page is completely on the left side, 1 means it's completely on the right side.
1
The position of the second page inside the book. 0 means the page is completely on the left side, 1 means it's completely on the right side.