How can one plot a sphere in R by providing a center point and a radius?
For example, something like this:
sphere_3d(center=c(1,1,1), r=2))
The plot would appear on a three dimensional coordinate system.
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Try spheres3d in the rgl package for an interactive plot:
library(rgl)
spheres3d(x = 1, y = 1, z = 1, radius = 1)
There are many other ways, so what's going to be useful needs more input.
mdsumner
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+1 thanks. Any idea of how to add a labelled coordinate system. I tried `axes3d()` which seems like a start, but it does not say what is x, y, and z. It would also be nice to be able to control the limits of the axes. – Jeromy Anglim Aug 23 '12 at 06:03
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@JeromyAnglim: An old answer (and one to a derivative of rgl in package:car) and you've probably moved on, but it might help someone else: http://stackoverflow.com/questions/8204972/carscatter3d-in-r-labeling-axis-better – IRTFM Apr 05 '14 at 18:34
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Adapted from @mdsummer's answer, this also adds axes.
library(rgl)
open3d() # create new plot
spheres3d(x = 1, y = 1, z = 1, radius = 1) # produce sphere
axes3d() # add x, y, and z axes
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Jeromy Anglim
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