看下這個 jaDZPX-yS
EDGES !! or CURVE BG=h1ybz
R=5 !! Vertex radius of curvature 0/),ylCj
K=-1 !! Conic constant Ye,E7A*L
H=5 !! Outer aperture height WSh+5](:
O=0 !! Inner obscuration height "Z,'NL>&
CONIC X 0, 0 0 -2*R 1 0 K+1, Y (O) (H) !!構建拋物線 Hm*n,8_
SHIFT Y 1 !!偏移 F+}MW/ra@
SWEEP AXIS 360 Z !!旋轉