How to make the curves of the picture shown in the photo on webgl?

Question

JavaScript

sandbox link. https://06pr6.csb.app/ The question is, how to make the parts of the grid marked in the screenshot go left, right. What needs to be added? I'm a bit confused about this yet, can you give an example.
How on this screen so that some waves of the grid

Answer 1

You can do it in different ways, for example: https://361es.csb.app/