I was curious so I looked up an example of judder. As one can predict, it was very annoying to look at. Here it is: https://youtu.be/5SSU-s0AUH0

I'm confused about case 1 image. Why is the shape diagonal, but the other way?

@bbqpork Looking at the graph starting from the top: Suppose we start with an object to the right of the eye. Then, eye starts moving towards the object => distance between object and eye decreases (x coordinate gets smaller in the graph). Eye catches up with the object and distance is 0 (x = 0 in the graph). Right after, object jumps further to the right and distance sharply increases again (x > 0 again).