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Suppose I render a simple eyeball:

AnatomyPlot3D[Entity["AnatomicalStructure", "RightEyeball"]]

Anatomy plot of eyeball

but want to cut it in half using ClipPlanes, for instance to eliminate the left half of the eyeball.

By what principled method do I know how to specify the plane? I tried the obvious 

ClipPlanes -> {1,0,0,0}

and 

{{0,0,0},{0,1,0},{0,0,1}}

without success.

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1 Answer 1

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Of course ClipPlanes works here. The problem is that you had mistakenly assumed the PlotRange:

eyeball = AnatomyPlot3D[Entity["AnatomicalStructure", "RightEyeball"]];

pr = PlotRange[eyeball]
   {{-43.6181, -17.298}, {-166.051, -138.829}, {1504.96, 1531.19}}

Thus,

Show[eyeball, 
     ClipPlanes -> InfinitePlane[Mean[Transpose[pr]], {1, -1} IdentityMatrix[3][[{2, 3}]]]]

eyeball cross-section

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  • $\begingroup$ I didn't know how to get the PlotRange of the object. Simple! Thanks so much. (Accept) $\endgroup$
    – David G. Stork
    Commented Mar 23, 2019 at 7:32
  • $\begingroup$ Another way of finding the center of the eyeball is with EntityValue[eyeball, "EnclosingSphere"][[1]]. $\endgroup$
    – Roman
    Commented Mar 23, 2019 at 12:55
  • $\begingroup$ @J.M. Do you know of a place where this functionality of PlotRange is documented? $\endgroup$
    – Lukas Lang
    Commented Mar 23, 2019 at 13:04
  • $\begingroup$ @Lukas, I do not believe it is documented, but it's been around for a long while. $\endgroup$
    – J. M.'s missing motivation ♦
    Commented Mar 23, 2019 at 13:07

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