看下這個 !0Mx Bem
EDGES !! or CURVE ~z kzuh
R=5 !! Vertex radius of curvature 4aGVIQ
K=-1 !! Conic constant ]i:_^z)R
H=5 !! Outer aperture height MtD0e@
O=0 !! Inner obscuration height hjgB[
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CONIC X 0, 0 0 -2*R 1 0 K+1, Y (O) (H) !!構建拋物線 K0usBA
SHIFT Y 1 !!偏移 @dyh:2!
SWEEP AXIS 360 Z !!旋轉