Press the rectangle tool button in order to create rectangles, which are defined by entering two diagonal corner points of the rectangle. If these two points are on a grid plane, the rectangle is created on the same plane. For example, the first and the second points have the equal z coordinate value, the plane of the rectangle is perpendicular to the z axis. If the corner points do not form a common plane normal to any one of x, y and z axis, the plane of rectangle is determined so that the shorter edge of the rectangle is made parallel to one of the coordinate axes. A rectangle is treated as one curve rather than four line segments.