看下這個 @g'SH:}
EDGES !! or CURVE 4U1"F 7'
R=5 !! Vertex radius of curvature ~0@+8%^>;
K=-1 !! Conic constant Fu!sw]6xx
H=5 !! Outer aperture height We,~P\g
O=0 !! Inner obscuration height '5"`H>[
CONIC X 0, 0 0 -2*R 1 0 K+1, Y (O) (H) !!構建拋物線 z"lRfOWI
SHIFT Y 1 !!偏移 sp$W=Wu7
SWEEP AXIS 360 Z !!旋轉