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Plotting isobaric surface in 3D

IDV users,
Does anyone know how to use the IDV to plot an isobaric surface in 3- D from model data? Pressure isn't a model variable (or a derived variable), so a 3-D surface of pressure can't be plotted directly, but I thought I recalled some trick to doing this using the 3-D geopotential height field. Maybe my memory is playing tricks, though. 

-- Dave