Awesome!

Thank you for your response! The built in modifiers have complex physically correct algorithms and have to many settings for my animators. My goal is to make my own algorithm that will be very easy to work with. For that I need to retrieve some attributes from blender. Like vertex position and the normals. Do some calculation and update the new vertex position every frame. My own search found a couple of answers but it's confusing what I should work with. I can register my own driver. Or I can use "frame handlers"? I'm not sure how to go about this.

Thank you so much for your explanation and the example code! This workflow is exactly what I was looking for. I’ll dive into it thoroughly, but I’m already super excited to start using it to create some really cool rigs and animations. Thank you again!