This tutorial shows how to create the effect of fish schooling and following each other under the ocean. It's fully operator based with no GLSL. This is however an intermediate level tutorial and requires familiarity with TouchDesigner in general. I hope it's useful, enjoy!
Patreon (Project Files): https://www.patreon.com/thoseeyes
SketchFab Fish Model: https://sketchfab.com/3d-models/cartoon-fish-08cc55fc36994e04ad24bf36b9aef6e5
David Braun Boid Tutorial: https://www.youtube.com/watch?v=f2yOYmOgZEA