[R] plot points using vis.gam

[mra]

Hello,
I'm trying to illustrate the relationships between various trait and
environment data gathered from a number of sites. I've created a GAM to do
this: gam1=gam(trait~s(env1)+s(env2)+te(env1,env2)) and I know how to create
a 3D plot using vis.gam.  I want to be able to show points on the 3D plot
indicating the sites that the data came from. I can do this on a 2D plot
when there is one term, e.g. gam2=gam(trait~s(env1)) but cannot figure it
out for the 3D plot.

Any help would be much appreciated

Monica
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