[R] labels in rgl.sphere

[Naoki Irie]

Dear R list

I am using rgl.sphere to visualize scatter plot data in three  
dimensional space.
Thanks to the rgl library, I can easily find out the data point that I  
am interested in.

However, as I can not see the labels of each data point directly in  
RGL window,
I usually look for the values of x, y, z axis to find out the label  
(or line number of the data point).

Is there any way that I can label all the (or clicked)  data point (=  
sphere) ?

Thank you.

Naoki