看下這個 r;GAQH}j_
EDGES !! or CURVE K k|mV&3J
R=5 !! Vertex radius of curvature `IJTO_
K=-1 !! Conic constant smHQ'4x9
H=5 !! Outer aperture height nf,Ez
O=0 !! Inner obscuration height
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CONIC X 0, 0 0 -2*R 1 0 K+1, Y (O) (H) !!構建拋物線 iVA=D&eZ
SHIFT Y 1 !!偏移 .@@&q4=&
SWEEP AXIS 360 Z !!旋轉