Adds the Region Export API (GET /api/export/:serverId/:dimension/
:x1/:z1/:x2/:z2, chunk-coordinate range, capped at 64 chunks server-
side) streaming raw chunkSections rows for a footprint, plus a fully
client-side pipeline that turns that into a downloadable glTF (.glb):
a JS port of the Rust worker's greedy mesher (voxel-mesh.js, mirrored
test-for-test against worker/src/mesh.rs) and block-color palette
(block-colors.js, mirrored against worker/src/palette.rs), a base64
section decoder, mesh merging with per-section world offsets, and a
hand-rolled minimal GLB writer (gltf-export.js) — hand-rolled rather
than Babylon's GLTF2Export since this project's Babylon usage never
meshes client-side (only renders pre-built buffers) and a live
Scene/Engine isn't needed or unit-testable. The whole mesh+export
pipeline runs inside a Web Worker (export-worker.js) so a multi-chunk
export doesn't block the UI thread. The map UI gets a drag-to-select
region tool (chunk-snapped, live rectangle preview, cap enforced
client-side too) and an Export glTF button.
Built test-first per the project's TDD workflow; the exported .glb
was independently validated with @gltf-transform/cli against real
seeded terrain data (correct triangle count, vertex count, and
bounding box for the selected area).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015tKdPZt78zbPUZMXWzKEKt
octoturge
c78661efb5