Qt's announcement webpage & video doesn't explain it very well. This is not a "3d game engine" like Unreal/CryEngine. It's an HMI (Human-Machine Interface) library and visual design editor . Therefore, it doesn't have a "physics engine" nor does it need one.
Probably the better webpage to get an idea of the use cases of "HMI" is the original NVIDIA pages:
>Why does the example _have_ to pull in Qt Quick to show live data?
I'm only going by the Qt webpage so I can't say that it absolutely requires Qt Quick as a unavoidable prerequisite. The Qt announcements says:
- ", so that designers can easily create 3D user interfaces that are easily integrated with the rest of the application written in Qt. The UIs can then also easily be extended using Qt Quick or Qt 3D."
So the demo video is showing how the UI interface created in 3D Studio is then integrated into a Qt Quick window.
Could Qt have made a demo with zero Qt Quick controls? Maybe. I don't know.
Probably the better webpage to get an idea of the use cases of "HMI" is the original NVIDIA pages:
http://www.nvidia.com/object/drive-design.html
http://www.nvidia.com/object/drive-automotive-technology.htm...
http://www.nvidia.com/object/automotive-infotainment-navigat...