nx_tissue.nx

nx_tissue.nx -- PIPELINE STAGE 3: FASCIA + FAT AS SOFT BODY, bridging muscle to skin. The industry pipeline is skeleton -> muscle -> fascia/fat -> skin, and an audit of our own stack found we had that pipeline's SHAPE and almost none of its PHYSICS: "fat" was a scalar knob attenuating how much muscle relief reached the skin. Nothing lagged, nothing settled, nothing was driven by the layer beneath. It also found that the solver had been built and gated months earlier and NEVER WIRED IN: runtime/ nx_softdyn.nx is a spring-damper soft body whose stability envelope is enforced BY CONSTRUCTION (past a damping threshold semi-implicit Euler inverts and amplifies velocity, so SD_CAPC/SD_CAPK make an unstable configuration impossible to REQUEST rather than merely discouraged). It shipped with no soft-tissue geometry to bind to. The layer emitter now emits muscle and fat layers, so this organ is the wiring. THE BINDING, and it is what makes this stage 3 rather than just re-running a solver: a LAYER-AWARE LATTICE. Solver points are seated on a coarse band lattice over the figure; every vertex is displaced by its band's point SCALED BY THE SOFTNESS OF ITS OWN LAYER. Bone scales to ZERO and does not move at all; muscle moves partly; skin and fat move fully. That is fascia doing its actual job -- transmitting motion from the rigid thing inside to the soft thing outside, with each layer lagging by its own amount. nx_tissue <in.nxmesh> <out.nxmesh> [accel] [K] [C] [steps] nx_tissue selftest license_tier: ORIGINAL expect_exit: 0 No hw writes (Rule 26).