how to create contour lines on a 3D surface plot by persp3d from rgl package

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HI, 

I created a 3D surface plot of 2D surface data (generated by kde2d)  by using persp3d from rlg as follows;


	persp3d(dens3d, theta=50, phi=25, expand=0.75, col=color[zcol], ticktype="detailed",axes=TRUE)

 I would like to add contour lines to this 3D surface plot and I?d appreciate if any help on this.  

Thanks in advance.  

AH


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