Representing virtual objects outside of a display screen

A system comprising:

• a display screen;
• a mixed-reality display device;
• and
• a computing device comprising one or more processors and memory, wherein the computing device, the display screen and the mixed-reality display device are operably connected by a communication network, and
• wherein the system is arranged and configured to carry out:
• receiving data defining a virtual environment, the virtual environment comprising a plurality of virtual objects, each virtual object having a virtual location within the virtual environment;
• displaying, on the display screen, a portion of the virtual environment that is within a field of view controlled by a user;
• determining if at least one virtual object of a subset of the plurality of virtual objects is outside of the field of view but at least partially within a virtual display area adjacent the display screen based on world to viewport co-ordinates of the at least one virtual object;
• in response to determining that a virtual object of the subset of the plurality of virtual objects is at least partially within the virtual display area adjacent the display screen, converting the virtual location of the virtual object into a real-world location based on the world to viewport co-ordinates;
• and
• displaying a virtual element representing the determined virtual object at the real-world location using the mixed-reality display device.