The Rounded Rectangle cross-section applies a rectangular section of set width and height and fillets the corners with a set radius. Additional parameters control this shape such as Keystone and Skew. Keystone will change the relative length of the top and bottom sides to make a trapezoidal or triangular shape. Skew will shift the top and bottom sides in opposite directions to make a rhomboidal profile. Key Corner is an important feature that will force the interpolated W lines about the body to pass through the cross-section corners, ensuring a purely sharp edge if desired.