[R] transparent surface in rgl

[Prof. Paul R. Fisher]

Hi all
I am a complete newbie to this list (just subscribed) and a newcomer to 
R (an S user from olden times). I have been using scatter3d to create a 
3d scatter plot with surface. The graphic is created within the rgl 
package and I have used rgl.postscript to export it so I can generate a 
publication quality image. My problem is that the plotted surface is no 
longer transparent in the postscript output ie. the rgl.spheres that are 
behind the surface disappear in the postscript image. Can't seem to find 
any info on this anywhere. Am I doing something wrong? Is there an easy fix?

Anyway, thanks.
Hope I've not broken some netiquette rule sending this.

Cheers,
Paul Fisher.
-- 
Prof. Paul R. Fisher,
Chair in Microbiology,
La Trobe University,
VIC 3086,
AUSTRALIA.

Tel. + 61 3 9479 2229
Fax. + 61 3 9479 1222
Email. fisher at lumi.latrobe.edu.au
Web. http://www.latrobe.edu.au/mcbg/my.html