nx_headcrop.nx

nx_headcrop.nx -- P1 FACE rung 1, THE INSTRUMENT (beyond-metahuman program). The face is the measured WORST region (head judge 227) but every judge so far scores it inside a WHOLE-BODY frame, where a head is a few percent of the pixels -- GX-48 proved a head-sized change moves a body-average by exactly zero. This organ crops an NXMSH2 to its own TOP y-band, so ours and the oracle can be benched HEAD-TO-HEAD at full render resolution by the existing nx_bodybench (its height-fit framing then normalises on the CROP's height = the head fills the frame). Band is per-mille of the mesh's OWN height => scale-invariant, works on any mesh, any species. A tri is kept only if ALL 3 verts are in the band (clean boundary); every count is DECLARED. nx_headcrop <in.nxmesh> <out.nxmesh> [lo_permil=870] [hi_permil=1000] nx_headcrop selftest license_tier: ORIGINAL expect_exit: 0 No hw writes (Rule 26).