We recently added support for V-Ray materials on 3DS Max. However, we did not provide a method for adding Ambient Occlusion to the model. Starting today, you can now add Ambient Occlusion.
Add Ambient Occlusion to V-Ray Materials
In order to add Ambient Occlusion (AO) to your models: 1) Bake AO, 2) Add the map to Fog Color slot, 3) Follow our export process. We will automatically read the AO Map from the Fog Color slot and add it to the output glTF and USDZ models.