nx_mechparts.nx

nx_mechparts.nx -- proper procedural MECHANICAL PRIMITIVES for the CAD car-twin viewer (cadtwin R1b-lite): real tessellated cylinders (24-gon), hex nuts WITH a real through-hole, bolts (shaft + hex head), washers, L-brackets, plates -- so /explodelab parts read as actual HARDWARE instead of the crude octagon-prism stand-ins. Emits straight into the nx_explode3d part buffers (ex3_vert/ex3_tri), all <=16 args, wasm-safe (no mmap in loops -- uses the e[13] scratch), deterministic integer. NOT a STEP B-rep tessellation (that needs a fixed-point B-spline evaluator = the deeper R1b rung); these are parametric primitives, the way CAD part catalogs themselves generate standard hardware. license_tier: ORIGINAL