Standalone Minecraft-style voxel demo (single HTML + generator)

[hzsw1234]

Summary

Adds a standalone single-file voxel sandbox at the repo root: minecraft-clone.html. It is not wired into existing static pages; open the file in a browser (with network for the Three.js import map CDN).

Contents

• minecraft-clone.html (~3960 lines): Three.js module game — procedural terrain (2D/3D noise, biomes, height table), caves, ores, trees, rare ruin pillars + crafting table, merged chunk meshes with atlas UVs, day/night sky and fog, zombies/skeletons/spiders/creepers (colored boxes), mining/placing, hotbar, hunger/health, particles, respawn.
• tools/generate_minecraft_clone.py: Regenerates the large embedded data sections (biome LUT, ore depth weights, sky stops, spawn weights, decoration rules, structure offsets, crafting recipes, block defs, drop table) plus the engine source, then splices into HTML if the marker /* ==== MC_CLONE_CHUNK_MARKER_START ==== */ is present in a template. The committed HTML is already fully expanded so the script is optional for edits.

Fixes applied in the shipped HTML

• Texture UVs span full 16×16 atlas cells (was 1px quads).
• Chunk neighbor rebuild only when the adjacent chunk exists and is generated.
• world.updateAround before spawn so ground query sees terrain.
• Melee uses look direction vs. horizontal vector to mob (no bogus keys.Mouse0).

How to run

Serve the file or open via file:// (import map may require a local server depending on browser). Example: python3 -m http.server in the repo root, then open /minecraft-clone.html.

  

[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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