Modifiers

shape.shell(thickness)   // Make hollow
shape.round(radius)      // Round all edges
shape.onion(thickness)   // Concentric shells
shape.elongate(x, y, z)  // Stretch with flat sections

shape.twist(amount)  // Twist around Y axis
shape.bend(amount)   // Bend around Y axis

shape.repeat_polar(count)              // Circle around Y
shape.repeat_limited(sx, sy, sz, cx, cy, cz)  // Finite grid