What is virtual reality?
Virtual Reality (VR) is a technology that replaces a user's physical surroundings with a computer-generated, three-dimensional digital environment. When wearing an enclosed VR headset, the physical room is completely blocked from view, and the user is placed inside a simulated world that responds to head and body movements in real time.
How virtual reality works in practice
Virtual reality relies on specialised hardware and real-time computing to generate a convincing sense of space and scale.
The primary components of a VR system include:
- The VR headset (head-mounted display): An enclosed wearable device containing high-resolution displays and optical lenses. The lenses focus the display screens for human eyes, creating a wide field of view (the total angular area visible to the user at any moment, typically between 90 and 110 degrees).
- Positional and rotational tracking: Headsets track user movement to update visual perspectives instantaneously. Tracking is categorised by degrees of freedom (DoF). Three degrees of freedom (3DoF) tracks rotational head movement (looking around from a stationary point), whereas six degrees of freedom (6DoF) tracks both rotation and translational movement (walking, stepping, ducking, or leaning in 3D space).
- Inside-out tracking: Modern standalone headsets use built-in outward-facing cameras and computer vision algorithms to track their position relative to the room, eliminating the need for external base stations.
- Handheld controllers and hand tracking: Users manipulate virtual objects using ergonomic wireless controllers equipped with buttons and sensors, or via bare-hand tracking powered by the headset cameras.
- Haptic feedback: Controllers incorporate precision vibration motors (haptics) that produce tactile sensations when touching or activating virtual controls.
- Spatial audio: Integrated speakers or headphones deliver 3D audio cues that match the distance and direction of sound sources in the simulation.
VR hardware generally falls into two categories: standalone headsets (all-in-one devices with built-in processors and batteries that operate without cables) and PC-tethered headsets (connected to high-performance computers for graphically intensive engineering or scientific visualisations).
What it feels like to use VR
When entering a VR simulation, users experience presence (the psychological sensation of truly being inside a simulated location rather than merely looking at a screen).
Because the visual display updates continuously in response to subtle head movements, the human visual system perceives digital objects at a 1:1 physical scale with authentic depth. To maintain comfort, modern systems run at high refresh rates (typically 90 to 120 frames per second) and maintain very low latency (the delay between physical movement and screen updates). Headsets also provide mechanical or digital adjustments for interpupillary distance (IPD, the distance between the centres of a user's pupils) to ensure optical clarity and reduce eye fatigue.
Where virtual reality is commonly used
VR is widely adopted across industry, education, and government for applications where immersive practice offers measurable advantages over conventional methods:
- High-risk and safety training: Organisations use VR simulations to train personnel for dangerous or rare events, such as emergency evacuations, firefighting, working at heights, electrical isolation, and industrial hazard identification. Learners can make mistakes safely without risking injury or equipment damage.
- Healthcare and clinical education: Medical universities and hospitals use VR for surgical rehearsal, anatomical dissection, equipment training, and communication practice. Clinicians can repeat complex procedures multiple times to build procedural confidence.
- Higher education and vocational learning: Students access virtual laboratories, engineering machinery, and historical reconstructions, enabling hands-on practical exercises that would otherwise be cost-prohibitive.
- Design review and spatial walkthroughs: Architects, urban planners, and industrial designers conduct full-scale collaborative walkthroughs of 3D architectural plans or manufactured assemblies before committing to physical builds.
Two of the uses listed above, as rendered illustrations. Not footage from a client build.
Virtual reality in practice at PTR
Communication and behaviour-change training is where PTR's own VR work concentrates. Mater Education, part of the Mater hospital group in Queensland, worked with PTR to bring its "Speaking with Good Judgement" staff communication program into a branched, 360-degree VR recreation of real Mater environments. Delivered face-to-face to more than 60 staff, Mater's own program evaluation reported the figures beside this text.
of participants said they enjoyed the Mater VR experience, as reported in Mater Education's own program evaluation. Full case study
said they wanted more VR-based learning in future programs, per the same Mater evaluation. Full case study
Central Coast Council took a similar approach for a different goal: a first-person VR experience giving people the perspective of someone with a disability in a beach and a shopping centre, used more than 200 times across community, teacher-training and CSIRO-facilitated sessions. Outside PTR's own delivered work, two other documented VR programs go further on measured outcomes: Mayo Clinic's "A Day In a Lifetime", evaluated across two peer-reviewed papers, and the Google CHI 2024 VR DEI training case study, a published academic case study. Both are linked here rather than re-summarised, since their own pages already carry the full, source-mapped detail.
What virtual reality is not (common confusions)
While 360-degree video allows a user to look around in all directions from a single fixed camera point (3DoF), it is pre-recorded and non-interactive. True VR generates interactive 3D environments in real time, allowing users to walk through space and interact with digital objects (6DoF). That said, 360 has a deliberate place on the immersion spectrum: because it runs in an ordinary browser on any device, it is often the easiest first taste of immersion. PTR's own live 360 experience on PTR Labs works exactly that way: drag, or just move your phone, and look around a real place, with no headset needed.
VR completely replaces the real world with a virtual one. Augmented Reality (AR) keeps the physical room visible and places digital information directly on top of real objects.
Early virtual reality devices sometimes caused motion discomfort due to display lag and low frame rates. Modern hardware with high refresh rates, low-latency tracking, and well-designed locomotion controls has significantly reduced visual discomfort for the vast majority of users, and peer-reviewed research on this "cybersickness" going back to 2000 has documented both its causes and practical ways to reduce it.
A 2025 peer-reviewed meta-analysis of VR in teacher education found a moderate overall training effect, but one that varied a great deal by what was being taught: strongest for content-knowledge and social skills, smaller for purely procedural or reflective tasks, and stronger on head-mounted displays than on desktop VR. The lesson generalises: VR is a tool suited to some training goals more than others, not a uniform upgrade on every format it replaces.
Is virtual reality the right fit?
- The physical environment is hazardous or costly, such as emergency evacuations, firefighting, or industrial hazard identification.
- Complete visual and spatial focus is needed, removing real-world distractions for deep procedural practice.
- True physical scale matters: understanding a building, vehicle, or anatomical structure at 1:1 scale.
- A difficult conversation or behaviour needs safe, repeatable rehearsal, as in the Mater and Mayo Clinic examples above.
- Physical space and safety: VR requires a clear, safe physical area free of obstacles, since users cannot see the real room while wearing the headset.
- Shared-hardware hygiene and comfort: Enclosed headsets are typically shared equipment in workplace deployments, and a minority of users still experience discomfort even with modern hardware.
- Tasks that need the real world in view: Anything requiring a person to simultaneously handle real tools, watch real colleagues, or respond to a real physical environment is better served by AR or MR, which keep the physical world visible.
- Low-frequency or fast-changing content: Building and maintaining a bespoke VR scenario takes time. For content used rarely or updated often, simpler formats are usually more practical.
To see how virtual reality environments are designed and applied, visit the XR overview page.
VR replaces what you see and hear with a fully simulated environment, viewed through an enclosed headset. That total replacement is what makes it well suited to rehearsing high-pressure or high-risk situations safely and repeatedly, and it is also what makes it unsuitable for tasks where people need to stay aware of their real surroundings.
Sources and further reading
- A Taxonomy of Mixed Reality Visual Displays (Milgram and Kishino) - IEICE Transactions on Information and Systems, 1994
- Using virtual reality for teacher education: a systematic review and meta-analysis (Han, Luo, Wang and Zhang) - Frontiers in Virtual Reality, 2025
- A Discussion of Cybersickness in Virtual Environments (LaViola) - ACM SIGCHI Bulletin, 2000
Mater Education case study · Mayo Clinic case study · Google CHI 2024 VR research