Chase
Lighter mesh for phones: tools/build.py --coarsen N (and UNROLL_STEP) keeps every Nth sampled row and column of a built mesh with the same UV mapping; PHerc0172 lite mesh 527,834 vertices (from 2,082,140), 1.5 MB packed, loaded automatically on phones via geometry.lite (?mesh=full or ?mesh=lite overrides); tear threshold follows the mesh step
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