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Hinge-axis joints combine the top faces of the hexahedrons, while the bottom faces are adaptively adjusted. The six control spheres also adjust the cutting plane. Green spheres, at each end, control the length of the hexahedron. The two middle green spheres (on each side of the hexahedron) control the width of the knife. Yellow spheres adjust angle between adjacent hexahedrons. The currently selected sphere is displayed in red
