🧊 Marching Squares in 3D: Isosurface Scanner with Marching Tetrahedra, Euler Characteristic and Slice Monitor

A Blender-modelled isosurface scanner: marching tetrahedra build a watertight mesh of metaballs, noise, gyroid, sphere or torus live, with a scan-ring slice shown on a monitor as 2D marching squares and Euler-characteristic checks.