How is a user interface called where one sees a 3D virtual world on a 2D screen?

I another question (Using virtual-reality as user interface) I am trying to ask about a specific user interface, which I called a "virtual reality", but by now it seems I am using the wrong word for what I am searching for.

What I am trying to refer to are imaginary worlds as they are common in modern time AAA role playing computer games, like "The Elder Scrolls 5: Skyrim", "The Witcher 3" or "World of Warcraft". Those worlds are experienced by navigating a character in this virtual 3D world in 3rd-person mode and/or in 1st person mode. The world is not experienced with virtual reality goggles, but on a the 2D screen of a computer or console.

I want to know how to call this user interface of navigating a 3D character in a 3D world, which is projected on the 2D surface of the computer screen.