如何在 tikz for latex 中创建如下图所示的三棱柱？

Question

我不想给它上色，而只想让绿色阴影变成深灰色阴影。有人能帮我吗？我将不胜感激！

Answer 1

这是一种相当不成熟的绘制此类事物的方法。

\documentclass[tikz,border=3mm]{standalone}
\usepackage{tikz-3dplot}
\begin{document}
\tdplotsetmaincoords{70}{30}
\begin{tikzpicture}[tdplot_main_coords,
    declare function={b=3;h=2;l=4;}]
 \draw[dashed] (-b/2,-l/2,0) -- (-b/2,l/2,0) edge (b/2,l/2,0) -- (0,l/2,h);     
 \draw (b/2,l/2,0) -- (0,l/2,h) -- (0,-l/2,h);
 \draw[fill=gray,fill opacity=0.3] (b/2,-l/2,0)  -- (0,-l/2,h) -- (-b/2,-l/2,0);
 \draw[blue] (b/2,-l/2,0)  -- node[below] {$\ell$} (b/2,l/2,0);
 \draw[green!70!black] (b/2,-l/2,0)  -- node[below] {$b$}  (-b/2,-l/2,0);
 \draw[red] (0,-l/2,0)  -- node[left] {$h$} (0,-l/2,h);
\end{tikzpicture}
\end{document}