Help with 3d Book rotation

I’m creating a 3D book with an open leaf animation, but I’m having trouble rotating the cover along with the folds and spine. Here is an example:

How can I create this animation? What calculations do I need to determine the final angle and position when opening the pages?

You can view a screenshot of my project here: Untitled — Freeimage.host

The closest I could recall about turning pages: How can I bend a corner of the plane in three.js - #3 by prisoner849 :thinking:

Good, but my model is different from the example you provided.
I have a spine and need to show it when turning the page. I have investigated the code of that site example and see that it calculates the position when the page is turning using AnchorPoint, Local to Parent, and Matrix4, but I don’t understand what they are used for.

This project is look good too,