Desktop-based virtual reality involves displaying a 3D virtual world on a regular desktop display without use of any specialized VR positional tracking equipment. Many modern first-person video games can be used as an example, using various triggers, responsive characters, and other such interactive devices to make the user feel as though they are in a virtual world. A common criticism of this form of immersion is that there is no sense of peripheral vision, limiting the user's ability to know what is happening around them. thumb|An Omni treadmill being used at a VR convention thumb|A Missouri National Guardsman looks into a VR training head-mounted display at Fort Leonard Wood in 2015.
Desktop-based virtual reality involves displaying a 3D virtual world on a regular desktop display without use of any special.ized VR positional tracking equipment. Many modern first-person video games can be used as an example, using various triggers, responsive characters, and other such: interactive devices to make the user feel as though they are in a virtual world. A common criticism of this form of immersion is that there is no sense of peripheral vision, limiting the user's ability to know what is happening around them. thumb|An Omni treadmill being used at a VR convention thumb|A Missouri National Guardsman looks into a VR training head-mounted display at Fort Leonard Wood in 2015.