advanced rendering for AutoCAD
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WalkAbout is perspective only. Orthographic views are not recommended in nXt, but if you must they do work most of the time. If you want to use a fixed pixel size (for example, 1024 x 768) and would like your view to closely match AutoCAD's, you can use a Layout (paperspace) to create properly formatted viewports for your rendering. Set the pixel size on the Render Settings tab and create an mview with the correct proportions. Make sure to make your viewport current by typing _MSPACE before starting a rendering.
Rendering from Layout, that's a good one, will give it a try.