答案1
我建议使用 TikZ 进行类似 3D 的绘图。只要按照它看起来的样子画就可以了 ^^。下次尝试发布一个最小的工作示例来展示您尝试过的方法。
\documentclass[tikz,border=5mm]{standalone}
\begin{document}
\begin{tikzpicture}
\def\shiftpoint{(.8,-1)}
\path
(0,0) coordinate (A1) +\shiftpoint coordinate (B1)
(2.7,3) coordinate (A2) +\shiftpoint coordinate (B2)
(A1-|A2) coordinate (A3) +\shiftpoint coordinate (B3)
;
\draw[dashed] (A1)--(A3) (A2)--(A3);
\draw (A1) parabola (A2);
\draw[fill=blue!50] (B1) parabola (B2)--(B3)--cycle;
\path (B3) node[above left=4mm]{$F$};
\draw (A1)--(B1) (A2)--(B2);
\foreach \p in {A1,A2,B1,B2,B3}
\draw[fill=white] (\p) circle(1pt);
\end{tikzpicture}
\end{document}