看下這個 rt!r2dq"
EDGES !! or CURVE xsP4\C>
R=5 !! Vertex radius of curvature u"+}I,'L
K=-1 !! Conic constant 5*G%IR@@LK
H=5 !! Outer aperture height @ 4UxRp6+
O=0 !! Inner obscuration height Zb(t3I>n
CONIC X 0, 0 0 -2*R 1 0 K+1, Y (O) (H) !!構建拋物線 , =y#m-9
SHIFT Y 1 !!偏移 PK:2xN:=
SWEEP AXIS 360 Z !!旋轉