Metaballs (Blinn 1982) modeling pipeline. The upper left image shows a given constraint shape, which can be an extreme low polygon mesh. The upper right image shows the result of packing (non-uniform) spheres into the constraint shape. The bottom left shows the isosurface of the implicitly defined surface, and the bottom right shows the final surface after the blending operators. This can then be turned into a high-resolution, high-detail mesh.