3D Koi Pond Fish Feeding Interaction Scene

A dynamic 3D koi pond scene built with Three.js in a single HTML file. It includes a waterfall, rocks, aquatic plants, and multiple koi in different colors and patterns, with water and environmental details in constant motion. Clicking the feed button makes the fish swim toward the food and grab it, and the camera can orbit and zoom. About 15 seconds. The recording comes from a side-by-side test of Gemini 4 Argon and Opus 5.5 on the same prompt, and it's a good reference for natural ambient short videos and 3D web demos.