How to rotate depending on the scroll?

Question

JavaScript

Hello. A little stuck at the time of the implementation of the function for the next. goals. I want to rotate a block with a 3d model: pageY/-3000; it doesn’t work very stable, because I want to rotate to a certain block so that the model is there in the place I need, by scrolling a little lower to another block, I want to fix the model in the position I need. Tell me, please, how to be. Thank you! weblife.su/WineBazar/#