Enter your user name and password. The Logon button will then appear.
Click the Logon button.
If your user name and password are correct:

Log Off button appears

Hollow person icon at top right changes to green solid person icon

Any models saved from prior use of the Vieweя appear in the left Navigation list

If this is your first use of the app, the left Navigation list is empty

Click the Log Off button to log off.

The viewer operates on all models of iPhone, iPad,
Apple laptop and desktop with current operating systems.

The viewer will only view USDZ file type 3D Models.

This requires

your device already contains USDZ files

you have a VЯitty cloud storage area containing USDZ files

you have a link to an internet 3D model

USDZ files are also created by VЯitty Scanneя and VЯitty Modeleя

A model group is simply a folder on your device.

In the example above, the model group is a folder named 3D Models

Use the gear button to

select a folder on your device

create a folder on your device

If you create a folder with the same name as a folder on your
Cloud Storage, the 3D Models will automatically download to your device.
As this may take a long time depending on the number of models to download,
leave the viewer app running until the download completes and the models appear.

Use the plus or the link button to add models to your model group.

Tap a model in the left nav list to display the interactive model.
Tap Delete Model to remove your model from Local and/or Cloud storage

Tap and drag on the model to rotate the view

On a device with a keyboard

Mouse scroll to move up and down

Option-scroll to zoom in and zoom out