--- title: "What is mixed reality (MR)? A practical guide for teams" description: "Mixed reality is where digital objects respond to the real room. How a headset maps a space, which devices do it, and the training uses that follow." canonical: https://peopletechrevolution.com/learn/xr/what-is-mixed-reality --- [Learn](https://peopletechrevolution.com/learn) # What is mixed reality? MR is the point where a digital object stops floating over the screen and starts answering the room. The headset builds a 3D map of the physical space, so a virtual object can rest on a real table, disappear behind a real wall, and respond to a real hand. ## How mixed reality works in practice That takes sensors to measure the room, computer vision to read it, and real-time computing to keep digital objects aligned while somebody walks around. Two people stand in a mapped room. - Video passthrough headsets. External cameras capture the room and render digital graphics into the camera stream at low latency. - Optical see-through headsets. Transparent lenses (waveguides) project digital light directly while the wearer looks straight at the real world. - Spatial mapping and meshing. Depth sensors build an invisible 3D mesh of the room, so a virtual ball bounces off a real desk. - Spatial persistence. Content anchors to fixed physical coordinates, so a digital dashboard stays on the same boardroom wall days later. - Direct hand tracking. Cameras track fingers and joints, so a user taps, pushes and resizes digital items without a controller. ### Occlusion, in Meta's own terms If a virtual character stands behind a real office chair, the chair naturally conceals the lower half of the character. A figure, partly hidden behind a real chair. Meta's developer documentation describes a Depth API that provides real-time, per-eye environment depth estimates to let developers build dynamic occlusion. [Meta developer blog, 2023](https://developers.meta.com/horizon/blog/building-mixed-reality-MR-meta-quest-3-connect-developers-presence-platform/) Eye tracking adds foveated rendering on top: the area a person is looking at stays sharp while peripheral detail drops, to save on graphics performance. ## Light is the other half of believing it Occlusion decides what you can see. Lighting decides whether your eye accepts that it is there at all. A figure of light in a real chair. When a digital figure occupies a real chair, the giveaway is the light. A headset that estimates the room's own lighting can throw that figure's glow onto the seat and the floor beneath it. The eye stops reading two pictures and starts reading one room. That matters more for practice than for looks. If the person you are rehearsing with does not seem to be in the room, neither does the conversation. ## What it feels like to use MR It feels less like going somewhere and more like something arriving. The room stays visible, so people keep their bearings and keep talking to whoever else is standing there. A holographic ball passes behind a real chair. Reaching for a virtual control panel beside a real machine works because hand tracking responds immediately, and because the panel behaves as though the room's geometry applies to it. Direct hand interaction also cuts down on controller use. ## Where mixed reality is commonly used MR fits work where digital guidance and physical equipment have to stay in view and answer each other. High-fidelity clinical training. Teams practise a procedure on a physical mannequin while holographic organs and vitals are superimposed onto it. Engineering and architectural prototyping. A 1:1 digital prototype is placed inside a real factory floor to test clearances and access. Complex assembly and quality assurance. Holographic guidance aligns directly with a physical part on the production line. Multi-user spatial collaboration. A team gathers around a physical table to work on a shared holographic model. ## Mixed reality in practice at PTR PTR builds mixed reality alongside its virtual and augmented reality work, for realistic practice: a safe setting, real pressure, the learner's own choice, and a debrief afterwards. A clinical scenario with a holographic patient. What changes is where the practice happens. MR anchors the scenario in the room the learner is already standing in, so a holographic person is met at a real bedside and a procedure is rehearsed against real equipment. ### A hologram that has to sit beside real equipment Mixed reality earns its place when the digital thing must line up with a real bed, a real machine or a real colleague. A real bedside with a holographic patient. A real wall holding anchored guidance in place. ## Common confusions about MR What people get wrong about mixed reality. MR goes beyond standard AR. Basic AR overlays static graphics on a camera feed; MR creates co-presence, where physical and digital items interact through spatial meshing, physics and occlusion. MR is not entirely separate from VR. Modern standalone headsets increasingly support both full VR and high-resolution MR passthrough on the same hardware. Passthrough is not identical to eyesight. The view is rendered via camera sensors and screens, so lighting and camera resolution can affect clarity compared with optical see-through glass. "Mixed reality" means several things. A 2019 ACM CHI study interviewed ten AR/VR experts and reviewed 68 papers, and found at least six competing notions of the term. Ask which one a vendor means before comparing two products. ## Is mixed reality the right fit? The conditions that make MR the obvious choice, and the ones that mean another format will serve better. A strong fit when Users must interact with digital models and physical objects at the same time, such as a holographic scan beside a real desk. Collaborative in-person training needs participants to see each other and shared assets naturally. Situational awareness is critical while navigating a real environment. Not the right fit when Hardware cost and complexity matter: MR headsets with depth sensors cost more than a phone-based AR app and need more setup. Small or frequently rearranged spaces make occlusion and anchoring less reliable. Battery and thermal limits cap continuous session length. When the task only needs a floating label, plain AR usually does the job. To explore how mixed reality applications are built for enterprise and training, visit the [XR overview page](https://peopletechrevolution.com/xr). ## The short version A Townsville PTR guest tries a standalone headset. MR keeps the real world visible, like AR, and gives digital objects a working understanding of the room. They can rest on real surfaces, hide behind real furniture, and stay in place between sessions. That deeper environmental integration separates MR from standard AR. ## What it looks like in a ward One clinical scenario, shown on three headsets. A ward scenario for feedback practice. Practising feedback in a ward scenario. A ward scenario for practising conversation. Still have a question about mixed reality? Ask our CEO Simon Lowe’s Digital Twin a question [Open the contact form](https://peopletechrevolution.com/learn/xr/what-is-mixed-reality#contact) Related PTR work and further reading [What is XR? The umbrella term, and where VR, AR and MR sit under it.](https://peopletechrevolution.com/learn/xr/what-is-xr) [What is virtual reality? The room replaced entirely, and why that is the point.](https://peopletechrevolution.com/learn/xr/what-is-virtual-reality) [What is augmented reality? Information added on top of the room, without occlusion.](https://peopletechrevolution.com/learn/xr/what-is-augmented-reality) [VR vs AR vs MR. The three side by side: what each replaces, keeps or adds.](https://peopletechrevolution.com/learn/xr/vr-vs-ar-vs-mr) ## Sources and further reading Research on mixed reality definitions and the reality-virtuality continuum, with guidance on building for Meta Quest. ### What is Mixed Reality? Speicher, Hall and Nebeling · ACM CHI · 2019 The study behind the "means several things" note above: ten experts, 68 papers, six competing definitions. [Read it at dl.acm.org](https://dl.acm.org/doi/10.1145/3290605.3300767) ### A Taxonomy of Mixed Reality Visual Displays Paul Milgram and Fumio Kishino · 1994 IEICE Transactions on Information and Systems. The original continuum that placed MR between the real and virtual ends. [Read it at globals.ieice.org](https://globals.ieice.org/en_transactions/information/10.1587/e77-d_12_1321/_p) ### Building for Mixed Reality on Meta Quest 3 Meta Horizon OS Developers blog · 2023 The Depth API and occlusion documentation behind the "occlusion, in Meta's own terms" band above. [Read it at developers.meta.com](https://developers.meta.com/horizon/blog/building-mixed-reality-MR-meta-quest-3-connect-developers-presence-platform/)