BlenderのGeometry Nodesで作るループする水面とコースティクス

Build a Blender Geometry Nodes setup that produces a periodic, loopable water surface without any baking. The surface is seen from above in deep blue, with bright white caustic-like ridges forming a shifting cellular web that animates smoothly and repeats seamlessly after a couple of seconds. It does not need to be a true fluid simulation; a procedural, time-driven approach is enough. Drive the whole setup through a Blender MCP connection so the agent creates and edits the node tree itself, and let a human only review the rendered output and request refinements. Keep parameters such as scale, speed, ridge sharpness and colour exposed as node inputs. Deliver the .blend file plus a short rendered loop. Done means the animation loops without a visible jump, the pattern reads clearly as water caustics, and no simulation cache is required.