I'm having trouble with RGL:

 > parametric3d(fx = function(u, v) u * exp(-0.5 * (u^2 + v^2 -
+ 2 * 0.75 * u * v)/sqrt(1-.75^2))^(1/3),
+ fy = function(u, v) v * exp(-0.5 * (u^2 + v^2 -
+ 2 * 0.75 * u * v)/sqrt(1-.75^2))^(1/3),
+ fz = function(u, v) exp(-0.5 * (u^2 + v^2 - 2 * 0.75 * u *
+ v)/sqrt(1-.75^2))^(1/3),
+ umin = -20, umax = 20, vmin = -20, vmax = 20,
+ n = 100)
Error in rgl.cur() : rgl_dev_getcurrent

session:

R version 2.5.1 (2007-06-27)
i386-apple-darwin8.9.1

locale:
C

attached base packages:
[1] "tcltk"     "grid"      "datasets"  "stats"     "graphics"   
"grDevices" "utils"     "methods"
[9] "base"

other attached packages:
          rgl       misc3d          car       UsingR       xtable  
latticeExtra      lattice     gridBase
       "0.74"      "0.4-0"      "1.2-2"      "0.1-6"       
"1.5-1"      "0.2-2"     "0.16-5"      "0.4-3"
         MASS          JGR       iplots       JavaGD        rJava
     "7.2-36"      "1.5-5"      "1.1-1"      "0.4-3"      "0.5-0"


I would appreciate getting help.
_____________________________
Professor Michael Kubovy
University of Virginia
Department of Psychology
USPS:     P.O.Box 400400    Charlottesville, VA 22904-4400
Parcels:    Room 102        Gilmer Hall
         McCormick Road    Charlottesville, VA 22903
Office:    B011    +1-434-982-4729
Lab:        B019    +1-434-982-4751
Fax:        +1-434-982-4766
WWW:    http://www.people.virginia.edu/~mk9y/



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