"Since there is no Ambient Occlusion Slot in 'Texture Set' Mode of the nXt-Material Editor,
I found another way around what to do with AO Maps:
Baking it into Diffuse; e.g. Multiplying AO Map over Diffuse/Albedo/Colour in…"
advanced rendering for AutoCAD
Download or play a video that covers the basics of AccuRender NXT:
AccuRender nXt Basics from Scott Davidson on Vimeo.
For alternate methods to view this video, go to: AccuRender NXT Basics (Webinar)
Downlaod a PDF tutorial covering a basic model setup: