js/grass.js: reusable single-file grass module for all our games — GPU-instanced
blades (33k+ in one draw call), vertex-shader wind hashed per blade, root->tip
fake-AO gradient x per-instance tint, alpha-test pixel style (nearest-filter
16x24 canvas cards, stepped sway), deterministic seed, player-push uniform.
docs/GRASS.md records the technique ladder (clump maps, shell texturing,
billboard LOD, MB atlas gen) for future tiers. Auto-grows on parkland + islands,
PARK panel style/density, included in exported levels via buildParkScene.
Test ride: grind physics — falling onto any flattened steel (rails, ledge caps,
pool coping) locks a slide along the segment, pop off with Space or ride off the
end; grass parts around the rider.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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