nx_meshseg3d.nx

nx_meshseg3d.nx -- 3D PART SEGMENTATION of a triangle mesh (cadtwin P2): decompose a scanned mesh into its component PARTS so each can be analyzed (per-part wall-thickness R5 + underbuilt R6). Classical region-growing: (a) CONNECTIVITY -- disconnected mesh pieces = separate parts; (b) CREASE -- within a connected piece, split at sharp dihedral edges (adjacent face normals differ by more than a DATA-DRIVEN threshold). ONE function with a cos-threshold param does both (threshold = -Q -> pure connectivity; higher -> crease-split). The neural SOTA (SAMPart3D/PartField, PartObjaverse-Tiny mIoU ~84) is trained-model-bound; this is the sovereign classical first rung. Composes nx_mesh3 + nx_meshthick (face normals). Deterministic. license_tier: ORIGINAL