看下這個 ,a{P4Bq
EDGES !! or CURVE DD+7V@
R=5 !! Vertex radius of curvature ]!W=^!
K=-1 !! Conic constant "b~+;<}Q
H=5 !! Outer aperture height 6##_%PO<m
O=0 !! Inner obscuration height '6nAF
CONIC X 0, 0 0 -2*R 1 0 K+1, Y (O) (H) !!構建拋物線 60^`JVGWH
SHIFT Y 1 !!偏移 6fE7W>la
SWEEP AXIS 360 Z !!旋轉