Fw: Graphing points with drop lines to a 3D surface

["Michael Bennett" <M.N.Bennett@warwick.ac.uk>]

Hi, I'm hoping someone may be able to help me with a problem I'm having with graphing some results in s-plus: I'm trying to construct a plot where I need to draw a 3D wireframe surface of values of a response that I have computed over a regular (this is OK) then add some points to the graph with "drop-lines" to the surface to indicate how far the points are from the surface. How can I achieve this last step?

 

Mike Bennett