看下這個 %TY;}V59 b
EDGES !! or CURVE 23lLoyN
R=5 !! Vertex radius of curvature p)t1]<,Of
K=-1 !! Conic constant 9 >t
H=5 !! Outer aperture height "Ih>>|r
O=0 !! Inner obscuration height K+0&~XU
CONIC X 0, 0 0 -2*R 1 0 K+1, Y (O) (H) !!構建拋物線 $[L8UUHY<8
SHIFT Y 1 !!偏移 'f#i@$|]
SWEEP AXIS 360 Z !!旋轉