[R] scatter3d: problem with spheres-color

[John Fox]

Dear René,

I've confirmed that the spheres aren't coloured correctly on my Ubuntu system (the first colour is used for all of the spheres), and I know that this works right on Windows, as you mentioned. I'm curious to try it on my Mac, but don't have that handy at the moment.

I also looked at the code for scatter3d.default(), and that is pretty straightforward; scatterplot3d.default() draws the spheres with the command

    rgl.spheres(x, y, z, color = surface.col[as.numeric(groups)], 
                radius = size)

I'm copying this response to Duncan Murdoch (the coauthor and maintainer of the rgl package) in case he has any insight into the problem.

Thank you for drawing this issue to my attention.

John

------------------------------------------------
John Fox
Sen. William McMaster Prof. of Social Statistics
Department of Sociology
McMaster University
Hamilton, Ontario, Canada
http://socserv.mcmaster.ca/jfox/

On Thu, 12 Apr 2012 19:14:21 +0200
 "René Mayer" <mayer at psychologie.tu-dresden.de> wrote:
> Dear List,
> I don't get scatter3d to color the sheres according to the '|' argument.
> 
> library(car)
> scatter3d(prestige ~ income + education|type, data=Prestige)
> 
> The spheres on my screen are all colored the same and they are not
> conditional on Prestige$type.
> On the other hand: Fit3d and Ellipse3d are colored according to the
> group argument.
> 
> rgl_0.92.879
> car_2.0-12
> R version 2.15.0
> i686-pc-linux-gnu (32-bit)
> 
> I checked this under windows and: here they are colored according to  'Prestige$type'.
> Hmm? What goes wrong here, any ideas?
> 
> thanks,
> René
> 
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