A HiDPI 3D scatter plot renders ten thousand cubes on a checkerboard ground plane using Three.js. The visualization merges individual cube geometries into a single mesh via `THREE.BufferGeometryUtils.mergeBufferGeometries` and applies normal-based coloring. Data comes from a Medical Cost CSV loaded with D3's `csv` function. The camera orbits interactively through Three.js OrbitControls, while the canvas is scaled by a factor of two for high-pixel-density displays.