看下這個 8I*yS#
EDGES !! or CURVE f3;[ZS
R=5 !! Vertex radius of curvature U7LCd+Z5X
K=-1 !! Conic constant pl}W|kW}
H=5 !! Outer aperture height e9\_H=t+
O=0 !! Inner obscuration height DW,Z})9
CONIC X 0, 0 0 -2*R 1 0 K+1, Y (O) (H) !!構建拋物線 v%#@.D!)
SHIFT Y 1 !!偏移 2UR1T~r
SWEEP AXIS 360 Z !!旋轉