nx_arousal_mesh.nx

nx_arousal_mesh.nx -- arousal on a real TRIANGLE MESH, not a raymarched implicit surface. ★ADOPTION, NOT INVENTION. The implicit->explicit bridge already existed and this lane was raymarching around it: nx_isosurf's surface_nets polygonizes any SDF into the nx_trimesh buffers, and nx_trimesh is a real rasterizer with sun direction, specular, texture and BAKED SHADOWS -- none of which a hand-rolled sphere-tracer has. nx_isosurf's own gate comment says it exists to "polygonize the holistic BEING's skin SDF -> a real triangle mesh". ★THE PHYSIOLOGY RIDES ON VERTEX COLOUR: after polygonization every vertex is evaluated through sk_eval_at at its own world position, so the flush field is Gouraud-interpolated across real triangles instead of being computed per-screen-pixel. Same optics, better substrate -- and the identical path an IMPORTED scan mesh takes, so nothing here is throwaway. ⚠HONEST LIMIT: surface-nets of the 44-ellipsoid rig yields a triangle mesh OF THAT RIG. This changes the renderer and the shading substrate, NOT the underlying form. The blob silhouette survives polygonization. Only a correct base mesh (nx_obj_import, gated 14/14) removes it. usage: nx_arousal_mesh <out.png> <sex0m1f> <drive_permil> <melanin_permil> [cell_fx] license_tier: ORIGINAL expect_exit: 0