3D 中的相对定位

Question

我正在尝试根据之前在另一个级别上定义的节点的( x, ) 坐标在 3D 中定位节点。但是，我不知道如何让它工作：yz

\documentclass{article}
\usepackage{tikz}
\usepackage[utf8]{inputenc}
\usepackage[pdftex, active, tightpage]{preview}
\usetikzlibrary{calc, 3d, backgrounds, positioning}
\setlength\PreviewBorder{2mm}
\begin{document}
\pgfdeclarelayer{background}
\pgfdeclarelayer{foreground}
\pgfsetlayers{background,main,foreground}
\begin{preview}
\begin{tikzpicture}[scale = 1, x  = {(-0.2cm, -0.5cm)},
    y  = {(0.9659cm, -0.05882cm)},
    z  = {(0cm, 1cm)}]
    \begin{scope}[canvas is yx plane at z = 0]
        \draw (2, 3) node[inner sep = 0pt, outer sep = 0pt, color = black!60, circle, minimum size = 0.2pt] (1) {};
        \draw (3, 3) node[inner sep = 0pt, outer sep = 0pt, color = black!60, circle, minimum size = 0.2pt] (2) {};
        \draw (3, 2) node[inner sep = 0pt, outer sep = 0pt, color = black!60, circle, minimum size = 0.2pt] (3) {};
        \draw (1.center) -- (2.center) -- (3.center) -- cycle;
    \end{scope}
    \begin{scope}[canvas is yx plane at z = 1.5]
        \draw (2, 3) node[inner sep = 0pt, outer sep = 0pt, color = red!60, circle, fill, text width = 0.2pt] {};
        \draw node[inner sep = 0pt, outer sep = 0pt, color = blue!60, circle, fill, text width = 0.2pt] at (1) {};
    \end{scope}
\end{tikzpicture}
\end{preview}
\end{document}

红色节点是他应该在的位置，具有明确的（x，y）坐标（就在第一个节点的“上方”），但蓝色节点位于z = 0

实现这一目标的有效方法是什么，即让蓝色节点覆盖红色节点？（是否可以避免使用第二个参数scope，而只使用at (1) ++ some magic relative displacement in 3D here甚至一些隐藏的（*）zshift参数？）

（*）我在手册中找不到这个

Answer 1

我不确定我是否理解了您的代码。我做了一些修改，但如果我走错了方向，我会更新我的答案。

首先minimum size = 0.2pt，它不够大，无法看到圆圈。默认情况下，线宽为0.4 pt，如果要看到节点，则需要增加宽度！然后，您可以避免一些重复并使用styles节点。创建第二个范围时，如果您用来(2,3)放置节点，则使用画布，并且节点放置正确。但是，当您想要将蓝色节点放置在 (1) 处时，您将节点放置在定义的坐标 (1) 处，该坐标定义在此范围之外，因此 (1) 的坐标不会改变！

我不明白text width = 0.2pt你的代码。这是一个错误吗？

这也许是最简单的代码：

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{calc, 3d, backgrounds, positioning}
\begin{document}

\begin{tikzpicture}[scale = 1, 
    x  = {(-0.2cm, -0.5cm)},
    y  = {(0.9659cm, -0.05882cm)},
    z  = {(0cm, 1cm)},
    every node/.style ={draw,
                       circle, minimum size = 1.8pt,
                       inner sep = 0pt, outer sep = 0pt}] 

    \begin{scope}[canvas is yx plane at z = 0,
                  every node/.append style ={ color = black!60}]
        \node (1) at  (2, 3)   {};
        \node (2) at  (3, 3)   {};
        \node (3) at  (3, 2)   {};
        \draw (1.center) -- (2.center) -- (3.center) -- cycle;
    \end{scope}

    \begin{scope}[every node/.append style ={ color = blue} ]
        \node[yshift=1.5 cm]  at  (1)   {};
        \node[yshift=1.5 cm]  at  (2)   {};
        \node[yshift=1.5 cm]  at  (3)   {};   
    \end{scope}
\end{tikzpicture}
\end{document}