I am working on a depth analysis of a river bed for a BP Docking Facility.  I would like to plot the model as a 3D wireframe (preferably 3D xray wireframe) but every time I plot it to PDF, it hides all the isolines and the actual rendering of the surfaces is choppy and does not represent what was drawn.  The image that is produced is completely different than what is on my layout screen.   I have attached two images.  The first is a screen shot of what I ideally would like to plot.  The second is a screen shot of what my plot actually looks like.. Can anyone please help me??? 

Hello rwwweber, maybe this would help you :
 
http://forums.autodesk.com/t5/autocad-2010-2011-2012/plotting-a-rendered-viewport-from-layout/td-p/3173932