rgl, multiple graphics ??

Hello

How can I get multipanel conditioning graphics with rgl as I do with lattice 
"|"

For example I have three variables x, y, z, w.  Where x,y,z are continuous
and w is categorical or discrete.
I want to use plot3d(x,y,z) for each value of w in a panel
something like  plot3d(z~x*y|w)


cheers

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