[R] 3D-surface colour based on the values of X or Y data points

[suresh]

Dear R-experts,

Using persp3d(), I plotted a 3d surface. I would like to colour this surface
based on the result values (dependent variable) grouped in, say, three to
five different ranges. Later, I would also like to paint the same surface
based on the range-values of one of the independent variables. 
Please help.

Thank you.

Regards,
Suresh
   
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