[Tex/LaTex] tikz-3dplot: Filling 3d-profile

tikz-3dplottikz-pgf

\documentclass[tikz,border=10pt]{standalone}
\usepackage{tikz-3dplot}

\begin{document}

\tdplotsetmaincoords{70}{70} 
\begin{tikzpicture}[tdplot_main_coords, scale=2]

    %define coordinates 
    \coordinate (O) at (0,0,0);
    \coordinate (A) at (-0.15,0,-0.1);
    \coordinate (B) at (0.15,0,-0.1);
    \coordinate (C) at (0.15,0,0.1);
    \coordinate (D) at (-0.15,0,0.1);
    \coordinate (E) at (-0.15,0.6,-0.1);
    \coordinate (F) at (0.15,0.6,-0.1);
    \coordinate (G) at (0.15,0.6,0.1);
    \coordinate (H) at (-0.15,0.6,0.1);

    %draw straight-profile
    \draw (A) -- (B) -- (C) -- (D) -- cycle;
    \draw (E) -- (F) -- (G) -- (H) -- cycle;
    \draw (A) -- (E);
    \draw (B) -- (F);
    \draw (C) -- (G);
    \draw (D) -- (H);

    %fill the straight-profile
    \draw[fill=blue, opacity = 0.1] (A) -- (E) -- (H) -- (D);
    \draw[fill=blue, opacity = 0.1] (B) -- (F) -- (G) -- (C);
    \draw[fill=blue, opacity = 0.1] (C) -- (G) -- (H) -- (D);
    \draw[fill=blue, opacity = 0.1] (A) -- (B) -- (F) -- (E);

    %draw bend-profile 
    \tdplotsetrotatedcoords{90}{90}{90}
    \coordinate (bend) at (0,1.1,0.5);
    \tdplotsetrotatedcoordsorigin{(bend)}
    \draw[canvas is zy plane at x = 0.15](-0.1,0.6) arc (0:-90:-0.6);
    \draw[canvas is zy plane at x = -0.15](-0.1,0.6) arc (0:-90:-0.6);
    \draw[canvas is zy plane at x = 0.15](0.1,0.6) arc (0:-90:-0.4);
    \draw[canvas is zy plane at x = -0.15](0.1,0.6) arc (0:-90:-0.4);
    \draw[tdplot_rotated_coords] (-0.15,0,-0.1) -- (0.15,0,-0.1) -- (0.15,0,0.1) -- (-0.15,0,0.1) -- (-0.15,0,-0.1);

    %fill the bend-profile
    %...?

\end{tikzpicture}
\end{document}

Hello,

I have the following problem. I want the black bend-profile to be filled blue like the straight-one. Can anyone help me with that problem?

Thanks, Nico

Best Answer

Something like this? But it isn't as tidy as it might be....

\documentclass[tikz,border=10pt]{standalone}
\usepackage{tikz-3dplot}
\begin{document}
\tdplotsetmaincoords{70}{70}
\begin{tikzpicture}
  [
    tdplot_main_coords,
    scale=2,
    my fill/.style={fill=blue, fill opacity=.1}
  ]
  %define coordinates
  \coordinate (O) at (0,0,0);
  \coordinate (A) at (-0.15,0,-0.1);
  \coordinate (B) at (0.15,0,-0.1);
  \coordinate (C) at (0.15,0,0.1);
  \coordinate (D) at (-0.15,0,0.1);
  \coordinate (E) at (-0.15,0.6,-0.1);
  \coordinate (F) at (0.15,0.6,-0.1);
  \coordinate (G) at (0.15,0.6,0.1);
  \coordinate (H) at (-0.15,0.6,0.1);
  % fill and draw the straight-profile
  \draw [my fill] (A) -- (B) -- (F) -- (E) -- cycle;
  \draw [my fill] (A) -- (E) -- (H) -- (D) -- cycle;
  \draw [my fill] (C) -- (G) -- (H) -- (D) -- cycle;
  \draw [my fill] (B) -- (F) -- (G) -- (C) -- cycle;
  % draw bend-profile
  \tdplotsetrotatedcoords{90}{90}{90}
  \coordinate (bend) at (0,1.1,0.5);
  \tdplotsetrotatedcoordsorigin{(bend)}
  % get first coordinate
  \path [canvas is zy plane at x = -0.15] (E) arc (0:-90:-0.6) coordinate (a);
  % draw and fill bend-profile
  \draw [canvas is zy plane at x = -0.15, my fill] (H) arc (0:-90:-0.4) coordinate (d) -- (a) arc (-90:0:-0.6) -- cycle;
  \draw [canvas is zy plane at x = 0.15, my fill] (F) arc (0:-90:-0.6) coordinate (b) -- (a) arc (-90:0:-0.6) -- cycle;
  \draw [canvas is zy plane at x = 0.15, my fill] (G) arc (0:-90:-0.4) coordinate (c) -- (d) arc (-90:0:-.4) -- cycle;
  \draw [canvas is zy plane at x = 0.15, my fill] (G) arc (0:-90:-0.4) coordinate (c) -- (b) arc (-90:0:-.6) -- cycle;
\end{tikzpicture}
\end{document}

Related Solutions

[Tex/LaTex] TikZ: Cropping the Bounding Box

The code adds some completely useless invisible (or rather white) stuff. The lines

\clip(0pt,403pt) -- (389.957pt,403pt) -- (389.957pt,99.6166pt) -- (0pt,99.6166pt) -- (0pt,403pt);
\color[rgb]{1,1,1}
\fill(3.76406pt,399.236pt) -- (380.923pt,399.236pt) -- (380.923pt,253.19pt) -- (3.76406pt,253.19pt) -- (3.76406pt,399.236pt);
\fill(53.4497pt,394.719pt) -- (374.901pt,394.719pt) -- (374.901pt,289.325pt) -- (53.4497pt,289.325pt) -- (53.4497pt,394.719pt);

draw a white background that is larger than the actual picture. TikZ sees that and thinks it is part of the picture. Simply removing/uncommenting these lines removes most of the whitespace.

Near the end of the first scope,

\color[rgb]{1,1,1}
\fill(3.76406pt,249.426pt) -- (386.193pt,249.426pt) -- (386.193pt,103.381pt) -- (3.76406pt,103.381pt) -- (3.76406pt,249.426pt);

does the same. Additionally (near the end of the second scope),

\pgftext[center, base, at={\pgfpoint{220.95pt}{106.392pt}}]{\sffamily\fontsize{9}{0}\selectfont{\textbf{ }}}

adds a blank node below the picture, again enlarging the bounding box.

Removing all those lines gives a tight bounding box.

As far as I know, TikZ cannot do the cropping for you, as it can't know whether the white stuff is intentional or not (there might for example be a dark background behind the image so that white is visible).

[Tex/LaTex] Line up nested tikz enviroments or how to get rid of them

As is explained in How do I draw shapes inside a tikz node? pics can be used for defining new objects. My main problem using pics is how to place where you want because they aren't nodes and positioning them is not so easy.

Following code shows how to define EDFA block.

    EDFA/.pic={
        \begin{scope}[scale=.5]
        \draw (-1,0) coordinate (in) --  (-1,1) -- (1,0) coordinate (out) --  (-1,-1) -- cycle;
        \node[anchor=north,inner sep=2pt] at (0,-1) {$1$};
        \end{scope}

In this case, coordinate (-1,0) will act as west anchor and 1,0 as east. Both point will have an special name for further reference. Every pic is placed according its own origin (0,0). You can use Claudio's answer to Anchoring TiKZ pics for better positioning.

As your example was simple, I'd prefer to star with EDFA and place Source and Sink after it.

\documentclass[]{article}

% tikz
\usepackage{tikz}
\usetikzlibrary{positioning} %relative positioning

\begin{document}

\tikzset{%
    EDFA/.pic={
        \begin{scope}[scale=.5]
        \draw (-1,0) coordinate (in) --  (-1,1) -- (1,0) coordinate (out) --  (-1,-1) -- cycle;
        \node[anchor=north,inner sep=2pt] at (0,-1) {$1$};
        \end{scope}
    }
}

\begin{tikzpicture}[
block/.style={draw},
]

\draw pic (edfa) {EDFA};

\node[block, left=of edfain] (source) {Source};

\node[block, right= of edfaout] (sink) {Sink};

\draw[->] (source) -- (edfain);
\draw[->] (edfaout) -- (sink);

\end{tikzpicture}

\end{document}

I understand that your components are more complex than EDFA because for this particular case an isosceles triangle node with a label will do the work and it can be used as a node and not as a pic:

\documentclass[]{article}

% tikz
\usepackage{tikz}
\usetikzlibrary{positioning} %relative positioning
\usetikzlibrary{shapes.geometric}

\begin{document}

\begin{tikzpicture}[
    block/.style={draw},
    edfa/.style={isosceles triangle, minimum width=1cm, 
         draw, anchor=west, isosceles triangle stretches, 
         minimum height=1cm, label=-80:#1}
]

\node[block] (source) {Source};

\node[edfa=1, right=of source] (edfa) {};

\node[block, right= of edfa] (sink) {Sink};

\draw[->] (source) -- (edfa);
\draw[->] (edfa) -- (sink);

\end{tikzpicture}

\end{document}

Best Answer

Related Solutions

[Tex/LaTex] TikZ: Cropping the Bounding Box

[Tex/LaTex] Line up nested tikz enviroments or how to get rid of them

Related Question