看下這個 3@&bxYXm
EDGES !! or CURVE =K .r
R=5 !! Vertex radius of curvature 9u?(^(.
K=-1 !! Conic constant jRofG'
H=5 !! Outer aperture height 2-~a
P
O=0 !! Inner obscuration height Ejq=*UOP
CONIC X 0, 0 0 -2*R 1 0 K+1, Y (O) (H) !!構建拋物線 SC'BmR"ox
SHIFT Y 1 !!偏移 "ml?7Xl,n
SWEEP AXIS 360 Z !!旋轉