nx_mesh3.nx

nx_mesh3.nx -- the SHARED triangle mesh + STL interchange (real3d census's connective-tissue gap: "CAD, print, games cannot hand geometry to each other today"; operator 2026-07-03: "make sure all of these things across the environment are reusable in other areas for robotics, manufacturing, video, vr, etc"). ONE mesh format, MANY consumers: CAD exports it, the printer slices it, games/video render it, robotics collides against it, VR scenes carry it. Vertices are fx256 integers (the ecosystem fixed-point law); STL IO is BINARY STL (the industry lingua franca: 80B header, u32 count, 50B/tri) with EXACT round-trip -- fx256 -> IEEE-754 f32 is exact for |v| < 2^24 because /256 is a pure exponent shift, so write->read is bit-identical (gated). Base-relative, no allocations beyond the caller's arena. license_tier: ORIGINAL