Putting thumb wheels and (smoothing or regression surface) on a 3-D scatterplot using GPL

[Art Kendall-2]

In *GPL* how do I get  thumb wheels to rotate 3-d charts?

In GPL how do I get a smoothed regression surface?


This IGRAPH shows how to do it, but I was curious how to do it in GPL.

GET
  FILE='C:\Program Files\SPSS15\Cars.sav'.
IGRAPH /VIEWNAME='Scatterplot' /X1 = VAR(weight) TYPE = SCALE /Y =
VAR(mpg) TYPE = SCALE /X2 = VAR(engine) TYPE = SCALE
 /COORDINATE = THREE  /FITLINE METHOD = LLR NORMAL BANDWIDTH = FAST
X1MULTIPLIER = 1.00  X2MULTIPLIER = 1.00 LINE = TOTAL
  SPIKE=OFF /X1LENGTH=3.0 /YLENGTH=3.0 /X2LENGTH=3.0 /CHARTLOOK='NONE'
/SCATTER COINCIDENT = NONE.
EXE.

Art Kendall
Social Research Consultants