看下這個 tA
K=W$r
EDGES !! or CURVE *uF Iw}C/
R=5 !! Vertex radius of curvature q6P5:@
K=-1 !! Conic constant 3C#Sr6
H=5 !! Outer aperture height asbFNJG{
O=0 !! Inner obscuration height 70nBC
CONIC X 0, 0 0 -2*R 1 0 K+1, Y (O) (H) !!構建拋物線 Wtflw>-
SHIFT Y 1 !!偏移 \Oe8h#%
SWEEP AXIS 360 Z !!旋轉