How to Convert an AR3 Material to nXt.
You can also convert an AR3 material to a nXt material and save it in nXt format. This article explains how to perform the conversion.
Step 1 - select an AR3 material
After starting SketchUp and loading IRender nXt, select a material icon from the toolbar.
Select a material from the library and click OK.
This will load the AR3 Material Dialog.
Step 2 - Convert to nXt
Click Convert to nXt