Overview

This example stress-tests the library at real planetary scale: a cube-sphere with the authalic Earth radius (6,371,007.2 m) and up to ~10 km of relief. Scroll to zoom — the orbit camera scales its zoom and rotate speed with your altitude above the terrain (via the runtime surface query), so a single gesture carries you from orbit down to a hover a few hundred metres above a mountainside.

The button in the top-left corner (hotkey V) switches to a pointer-lock fly camera: click the canvas to grab the mouse, WASD to move, Space/C for up/down along the local surface normal, Q/E to roll, Shift to boost, Esc to release. Its move speed also scales with altitude, so the same keys work for crossing an ocean from orbit or skimming a valley floor.

Points of interest at this scale:

• LOD range — from orbit to the surface the quadtree spans ~14 levels of subdivision. Switch the lod mode between distance and screen to compare refinement strategies, and enable wireframe to watch tiles split as you descend.
• float32 precision floor — the elevation field is evaluated from worldPosition (~6.37e6 m) in a float32 compute pass, where one ULP is ~0.5 m. maxLevel defaults to 14, which keeps vertices ~10 m apart; push it past ~15 and vertex positions quantise, dissolving the close-up surface into shard noise. This is the library operating at the edge of what single-precision world coordinates allow.