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I am trying to draw a solid sphere with a cylindrical drilled through its center. The best I have been able to do is:

enter image description here

which does not show it is solid. How do I make it more solid in appearance?

Notes:

  • The code is adapted from Strange problems in 3D-Plots TikZ: Missing parts and axes
  • Besides a nice color version, I also need to be able to copy this in black and white so if you have suggestions on that, that would be helpful as well.
  • Eventually need to be able to label the two radii: the sphere's and the cylinder's.

Code:

\documentclass{article}
\usepackage{pgfplots}

\begin{document}
\begin{tikzpicture}
\begin{axis}[width=\textwidth,
  samples=25,domain=0:360,y domain=-60:60,
  xmin=-1.2,xmax=1.2,ymin=-1.2,ymax=1.2,zmin=-1.2,zmax=1.2,
  xlabel={$x$},ylabel={$y$},zlabel={$z$},
  axis lines=none]
\addplot3[surf,opacity=0.5]
  ({cos(x)*cos(y)}, {sin(x)*cos(y)}, {1.5*sin(y)});
\end{axis}
\end{tikzpicture}
\end{document}
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1 Answer 1

I found the colormap/blackwhite paprameter for axis environment from PGF manual and shader option.

\documentclass{article}
\usepackage{pgfplots}

\begin{document}
\begin{tikzpicture}
\begin{axis}[width=\textwidth,
  samples=25,domain=0:360,y domain=-60:60,
  xmin=-1.2,xmax=1.2,ymin=-1.2,ymax=1.2,zmin=-1.2,zmax=1.2,
  xlabel={$x$},ylabel={$y$},zlabel={$z$},
  axis lines=none,
  colormap/blackwhite]
\addplot3[surf,opacity=0.5,shader=interp]
  ({cos(x)*cos(y)}, {sin(x)*cos(y)}, {1.5*sin(y)});
\end{axis}
\fill[top color=white,bottom color=blue!10,middle color=gray,shading=axis,opacity=0.25] (5.25,2) circle (1.75cm and 0.6cm);% Bottom hole
\end{tikzpicture}
\end{document}

Here is the result:

enter image description here

Update: For adding bottom hole, insert some code using circle.

enter image description here

share|improve this answer
    
That certainly helps with the black and white print version issue, but still does not quite look solid -- still appears to be just a shell of a sphere. –  Peter Grill Feb 21 at 22:17

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