module move(vec) {
  translate(vec) children();
}

module extrude(height = 100, center = true, convexity = 10, twist = 0, slices = 20, scale = 1.0) {
  linear_extrude(height = height, center = center, convexity = convexity, twist = twist, slices = slices, scale = scale) children();
}

module revolve(angle = 360, convexity = 2)  {
  rotate_extrude(angle = angle, convexity = convexity) children();
}

module 2d_front() {
    rotate(x(90)) children();
}

module 2d_left() {
    rotate(z(-90)) 2d_front() children();
}

module 2d_right() {
    rotate(z(90)) 2d_front() children();
}