I have a bivariate dataset that I want to display as a bivariate histogram in 3D. No problem there; I can use PROC KDE to bin the data, and then pass the output to a graphics template through PROC SGRENDER. My problem is that I want to highlight the histogram value for a particular set of co-ordinates. For a 2D plot, I could do this with an annotate dataset (or, there are various kludges with PROC SGPLOT). Can I do this for a 3D plot? One possible angle is that I could position a suitable marker in annotate, using the figure dimensions as the drawspace. I'm not particularly keen about that, because I would have the translate the co-ordinates of my featured point into graph positions. Since the bivariate histogram is shown in an orthographic (I think...) projection, I expect that would lead to some time-consuming geometry. Can anybody suggest an example where such a thing has been done? Alternatively, does the ANNOTATE facility support any three-dimensional functionality when the DRAWSPACE is set to DATA? Any advice would be gratefully appreciated. Kind regards, Barney Krebs
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