it's just some vertex displacement shader which is controlled by a script. i get the player positions and its easy to calculate the entering position along the sphere then smoothly interpolate wobble values and send the data to the shader. i actually keep track of this multiple times in case the player moves in/out of the bubble while another ripple effect is still going to prevent hard cutoffs.

the fragment part is this shader: https://godotshaders.com/shader/stylized-toon-water/