To make an object transparent:

1. Drag the Flat shader from the Asset browser and drop it on a model in the Viewer window.
2. Select Append.
3. Adjust the object’s brightness with the Luminosity slider, if desired.
4. Choose a form of transparency for the object with the Transparency Type menu.
5. Adjust the amount of transparency applied to the object with the Transparency Factor slider.

If there is a texture applied to the object, its Alpha channel is affected. If there is no texture, the object’s material Transparency property is affected.