[R] Aid with 3-D scatterplots

[Jim and Chana Milks]

I am attempting to classify pixels from a Landsat image by using their 
associated numbers in bands 2, 3, and 4 (It's from an assignment on 
classification).  To aid me, I want to create a 3-D scatterplot using 
the "cloud" command.  Due to my ignorance of the finer plotting 
functions, I am unable to display the scale on the three axes or to 
display the grid.

My dataframe (RS) contains four columns: Class, band2, band3, band4.  
Class is the classification variable (vegetation, water, soil, etc.)

The basic code I used was:
cloud(band4~band2*band3,RS,xlab="TM Band 2",ylab="TM Band 3",zlab="TM 
Band 4",group=RS$Class).

Unfortunately, I'm unsure which arguments to use and how to write them 
in.  I've tried adding arguments using "scale", but have not been 
successful, mostly because I'm unsure which arguments apply.  The scale 
I want for all three axes is 0-100.

Thank you for any help.

Jim Milks