看下這個 hj#+8=
EDGES !! or CURVE cwDD(j
R=5 !! Vertex radius of curvature +Qb2LR
K=-1 !! Conic constant Qh1Kl_a?Lv
H=5 !! Outer aperture height ( .6tz
O=0 !! Inner obscuration height 9X^-)G>
CONIC X 0, 0 0 -2*R 1 0 K+1, Y (O) (H) !!構建拋物線 A)s"h=R
SHIFT Y 1 !!偏移 ?tal/uC
SWEEP AXIS 360 Z !!旋轉