[R] rgl keyboard shortcut for translation on Mac?

[Bryan Hanson]

Hello Everyone.

I¹m on a Mac, using rgl.  Thanks to all the developers and maintainers on
it!

If I drag the mouse, I can rotate the view, if I hold down the option key or
the ctrl key and drag, I get scaling (though at times I seem to alter the
perspective?).  Adding the shift key doesn't seem to modify anything.

So, what I can't find is a key combination that translates the object.  From
reading various documents about openGL, it seems there might be a toggle
somewhere, but I need a hint!  Or do I need to install/invoke some
additional command?

Thanks, Bryan
*************
Bryan Hanson
Acting Chair
Professor of Chemistry & Biochemistry
DePauw University, Greencastle IN USA

> sessionInfo()
R version 2.10.0 RC (2009-10-19 r50172)
i386-apple-darwin8.11.1

locale:
[1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] datasets  tools     grid      graphics  grDevices utils     stats
methods   base     

other attached packages:
 [1] dichromat_1.2-3    mvbutils_2.5.0     ChemoSpec_1.31     rgl_0.87
lattice_0.17-26   
 [6] mvoutlier_1.4      plyr_0.1.9         RColorBrewer_1.0-2
chemometrics_0.5   som_0.3-4
[11] robustbase_0.5-0-1 rpart_3.1-45       pls_2.1-0          pcaPP_1.7
mvtnorm_0.9-8     
[16] nnet_7.3-1         mclust_3.3.2       MASS_7.3-4         lars_0.9-7
e1071_1.5-21      
[21] class_7.3-1