A 3D terrain visualization maps elevation data from a CSV file onto a Three.js plane, using a custom vertex shader to displace geometry based on height values. The scene applies multiple procedural textures—ocean, sand, grass, rock, and snow—blended in the fragment shader according to elevation thresholds, while a semi-transparent blue box simulates water. D3 loads the CSV dataset, and THREEE.OrbitControls enables interactive camera rotation, zoom, and panning around the generated landscape.