nx_step_brepw.nx

nx_step_brepw.nx -- ANALYTIC B-REP STEP WRITE (cadtwin P3a write parity): two capabilities. (A) sw2_box AUTHORS a true analytic B-rep from parameters: 8 VERTEX_POINTs, 12 EDGE_CURVEs on LINEs, 24 ORIENTED_EDGEs, 6 ADVANCED_FACEs on PLANEs (AXIS2 origin/normal/refdir), MANIFOLD_SOLID_BREP + product chain + DECLARED mm units -- generated numerically, not copied. Verified by reading it back through the full gated v2 pipeline (planar tessellation, exact invariants, exact dimensions). (B) sw2_reemit RE-SERIALIZES any parsed model's reachable B-rep graph (BFS from every SDR/NAUO/CDSR seed) with renumbered ids -- entity args copied span-wise with refs REWRITTEN (strings skipped), complex instances preserved. = persistence for anything we can read (planes, degree-5 splines, rational Bezier surfaces/curves). Verified: re-parse -> full planar+NURBS tessellation == the original model's (face counts + order-invariant geometry checksum). Uses swb_* from nx_step_write ('#' emitted as byte 35 -- literal gotcha). license_tier: ORIGINAL