advanced rendering for AutoCAD
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I would recommend a perspective view looking down from above. If you must, you can use an orthographic 3d view, but perspectives generally work better.
Either exclude blocking objects from the view using AutoCAD-- for example, by freezing layers-- or use clipping planes. Below are two threads which discuss clipping planes-- the second one has a plan-like rendering:
http://www.accurender.com/forum/topics/clipping-plane-tutorial?comm...
http://www.accurender.com/forum/topics/lighting-model-interior-with