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I have a surface that has Elevation Banding but I also have an airphoto in the drawing. Can you apply transparency to elevation banding so that the airphoto shows up.
Cheers,
Which Civil 3D version? 2012 yes, 2013, there's seems to be a bug that make this not work.
Whatever layer the surface is on, just set that layer's transparency to the desired number. Of course transparency needs to be turned on (TPY button in the status bar). And if you're going to print, ensure transparency is turned on in the plot dialog.