Sado Rabaudi, Dan Tinkham & Matthias Pusch
In our updated guide, you learn which important questions to ask, and how to conceptualize a VR lab that sets you up for long-term success. We feature the latest VR hardware, plus new information on eye tracking and VR training.
In this updated guide you will find answers to these questions:
For more detailed information on how to set up a virtual reality lab and help with custom configuration, please contact us at firstname.lastname@example.org.
We’ve been thinking long and hard about the decision making process you as a customer are faced with. Here are a few reads worth your while: Our 2023 Budgeting Guidelines for Scientific VR Labs provides a detailed view on cost considerations including specific pricing for VR hardware, software and application development for scientists looking to start or upgrade their VR research lab.
The “WorldViz Partners in Science Report” is an annual report that collects hundreds of peer reviewed research publications which utilize WorldViz products. Covering a range of academic disciplines including Computer Science, Psychology, Engineering, Physiology and Neuroscience, we invite you to explore the current and past reports for a comprehensive overview of the state of VR research applications.
Throughout the world, more and more research labs are turning to using Virtual Reality for their studies. Why? Virtual Reality provides high ecological validity, repeatability of studies, and lets you design complex scenarios at high cost efficiency. Studies have shown that when participants are exposed to a simulation using a VR display they respond to it almost as if exposed to a real-world scenario (see chart below).
Some experimental scenarios would be very difficult to set up and repeat using traditional methods - think of asking a cohort of participants to navigate a busy city environment with unchanged conditions for each participant. Not only is this easy to create in VR, but one can repeat it as many times as needed.
Another major benefit to a VR based experiment, is that you can run multiple participants through a simulation who are located in separate physical spaces, even in different parts of the world!
So what are the things to keep in mind when setting up a Virtual Reality lab, and how does one go about this? Read on to find out.
• Budget - Cost and potential ROI are important considerations when determining the ideal VR system for you.
• Customizability and scalability - A good virtual reality system can be upgraded to incorporate the latest tech advances while scaling to fit your evolving business needs.
• Use case - What do you want to achieve with the VR system? Different use cases sometimes require different hardware.
• Footprint - The installation space and storage you must permanently dedicate to your VR setup.
• Quality of experience - Unless a VR system is equipped with high levels of visual refresh rates and fast responses to the movement, participants can experience the environment as lagging and drifting, which can potentially cause motion sickness.
• Responsiveness - How well the VR system responds to your movements and interaction. This responsiveness is typically assessed by the “degrees of freedom” (DoF - up to six) that your VR system delivers. More concretely, does the VR hardware respond to the participant’s three directions of movement - up/down, forward/back, and left/right - in combination with the three directions of head rotation, often termed yaw, pitch, and roll.
At the heart of every VR environment is a software program used to construct and then display the simulated 3D experience, along with a computer processor. The invented worlds of VR can run the gamut from the most simple geometrical block shapes to the most intricately detailed universes that call forth a true sense of awe and wonder. Some VR applications – for example, those delineating the complex worlds of VR games – may take months to develop. Most industry applications don’t need (or want) such elaborate complexity, nor do they have the time to wait for such development. If you and
your team are doing the development, important considerations for evaluating such software are:
WorldViz makes Vizard, a comprehensive virtual reality software tool for researchers. Additional options include the Unity and Unreal engines, among others.
First thing to look at is the physical space layout of your room. A few questions to consider:
In order to have a functional, safe space in which to maneuver, you will need to block off an open area that is free from any obstacles or clutter. If you are using a camera based motion tracking system that requires free line-of-sight you need to make sure that everywhere the participant walks they are in good view of the cameras. Depending on the particular motion tracking system you choose, different numbers of cameras may be necessary to guarantee optimal coverage of your space. You may have to also account for things that can cause light interference, such as reflective surfaces (windows, glass, etc.) and sources of infrared light (if the system is using infrared motion tracking).
We recommend you consider having a spotter available for the safety of your participants wearing a VR headset. Since the participant will not see the physical boundaries of your lab, it is a good idea to have someone available who can guide them, as well as keep cables out of the way. Most modern VR systems will also provide a virtual boundary system that you can adjust to the size of your physical space.
In considering whether the participant and experimenter should be in the same space or not, weigh these factors: Will it be more important for you to keep an eye on the participant and maintain direct communication, or does your experiment require full separation of participants from those collecting data? Either way, there are many benefits to choosing a separate room and computer for the experimenter, including the ability to record from multiple viewpoints, or to blend physiological data measurements and monitor them in real-time.
As far as wires are concerned, keep in mind devices that need a tethered connection, for example physiological measuring or eye tracking devices. For a non-tethered solution to connect to the rendering computer, you can consider a backpack based PC, such as this one from HP. For cable management you can use drop ceilings, cable runners, or cable pulley systems.
If you are using a projection based VR system (more details on this later), you will need a large, clean -preferably white or light gray - wall as your projection surface. You will also want to be able to manage ambient light interference.
If participants need to be prepared before entering your simulation, for example to attach physiological measuring devices, you may want to plan for a separate adjacent room.
One last factor to consider is that you may need a neutral environment free of biases influencing experimental results, for example an environment that is noticeably hot or cold, noisy, or in other ways affects a participant’s state of mind.
Next we will go over the hardware that you will need. We will cover the basics first, and then go into a few more advanced setups. For help in acquiring off the shelf, pre-configured Virtual Reality systems contact email@example.com
The most common display for a VR system uses a VR headset for the display. There are quite a few to choose from, and factors to consider when looking at which one will be best for your setup. One big separation is whether the headset is connected to a PC or runs standalone as an android device. For the best graphical quality and experience a PC based VR headset is recommended such as the HP Reverb Omnicept or HTC VIVE Pro Eye. For an Android based option, the Meta Quest2 device is a very good option, as it works in three modes: wired to a PC with a USB-C connector cable, or wireless over airlink, or as an Android based standalone device. Development for the Android based platform proves to be more challenging than for PC based systems, as graphics are much more limited and more optimization is required to reach acceptable performance.
Some other factors to consider are resolution, FOV, tracking system, development platforms, price, comfort and whether you wish to have things like eye tracking included. Resolution is consistently increasing in VR headsets, and we have seen the progression from the VFX1 in the 90s at 263x230 per eye resolution to the newer high resolution and wide field of view headsets like the Pimax 12K QLED, as well as pixel density increase all the way to Human-eye resolution with 71 PPD (Pixel Per Degree) peak fidelity in the Varjo VR-3 headset.
When one thinks of a Virtual Reality display, the first thing they may think of is a VR Headset (such as the HP Reverb Omnicept). However, there are many benefits to using a 3D projection setup. If you are going to be using a larger group of individuals a 3D projection based setup would allow for many users to experience an immersive simulation just wearing 3D shutter glasses. For an even more immersive projection experience, you can have the main user’s viewpoint tracked using a system like our PPT tracking that will then update the viewpoint based on where a user is located. For the rest of the users to see the correct perspective, they would have to be positioned fairly close to the user that is being tracked.
A 3D projection system usually consists of a number of projectors that range from business class to cinema grade. Economical solutions use ultra short throw projectors (or lenses) since this allows to front project the image onto the screen or wall without having participants cast shadows. They also require a smaller footprint compared to rear projections setups. Aside from the projectors one or multiple rendering computers that support Quad buffering (i.e. using an Nvidia Quadro card), 3D glasses (and an emitter for certain shutter glasses), an input device (such as a wand or controller) and possibly some kind of tracking system if you want to have the viewpoint updated to the user’s position are typically part of the system.
VizMove PRISM Virtual Simulation Room
The WorldViz VizMove PRISM virtual simulation room is an all inclusive immersive training solution using projection that lets you capture real world scenes and bring them into your training space without technical expertise. The PRISM System allows users to utilize 360 videos and images in a touch screen environment, and convert any room into a content-rich learning environment. PRISM combines 360 visualization, 3D sound, interactive touch, scents and more.
Creating content for PRISM is easy and intuitive. Capture images and videos from anywhere with the included 360-degree camera, drag-and-drop the media into PRISM to create a scene, and enhance with sounds, lights, smells, and interactive triggers.
Multi-Sensory Interactive Training
To interact with the environment, users touch walls or activate triggers with controllers. PRISM delivers surround sound, controllable lighting, and diffused smells for enhanced realism. The experience elicits emotions, memories, and responses that improve learning retention and reliable skills performance.
PRISM comes in a variety of configurations to meet specific training needs and to fit most rooms. PRISM installs high on walls and within ceilings, so rooms remain open and multi-purpose.
There are different tracking systems associated with headsets as well, such as the Valve Index and Vive lighthouse, or the Meta Quest2, Vive Cosmos and HP Reverb Omnicept inside out tracking. Certain optical tracking systems (such as WorldViz’s PPT motion tracking system) can also be attached to upgrade a tracking system if you wish to either increase the positional accuracy or add the ability to track a larger space (such as adding PPT to an Oculus headset).
Here’s a quick rundown of the some of the common tracking systems used in a VR system:
Optical tracking (passive) - Uses reflective markers. Requires many cameras and many markers.
Optical tracking (active) - Active markers flash at specific frequencies. Highly accurate. Can track up to 32 markers with less cameras than passive systems.
Magnetic - measures the intensity of a magnetic field in various directions.
Inertial Tracking - Uses accelerometers and gyroscopes. Subject to drift. Not accurate for positional tracking.
Inside Out Tracking (markerless or with markers) - Cameras or sensors on the headset are used to track position.
For any VR system, you are going to need a good computer. Most gaming computers meet the minimum requirements, but this can also vary depending on whether you are wanting to render very complicated and large models (such as CAD models or large point cloud models). For walking/headset based systems you should try to go with an NVidia RTX or GTX based card, and for projection you would need a Quadro card. Here are some general minimum requirements to shoot for.
As mentioned earlier, you can also look to use a backpack based PC solution, that will allow the users to freely navigate the environment without the constraint of a wire. Although the downside to this is that you are limited with battery life and there are complexities that get introduced (such as having to find a way to stream the display of the backpack PC to an outside computer if you don’t want to have to plug it into a display each time you need to start a simulation).
Oftentimes, labs choose to combine walking VR with a projection system, and one benefit to this is you have a large display in which you can mirror the simulation for outside viewing. You can also mirror the simulation to the rendering computer’s monitor.
In order to interact with your virtual simulation users will need some kind of an input device, this could be anything from the typical hand controllers that come with most VR headsets (such as the Vive wands), to a keyboard and mouse if seated, or even using hand gestures with a data glove.
To increase immersion and data analysis information, there are many accessories that can be added (way too many to go into detail here, to discuss this further contact one of our helpful sales people to walk you through the options). Vizard’s vizconnect tool makes it easy to connect to over 100 devices for VR simulations, more information on that here. Some of the more common accessories are:
Sound can be an important, sometimes overlooked, aspect in a virtual simulation hardware setup. While most VR headsets come with headphones, if you are using something like a Projection VR setup with a group of participants it may be more beneficial to have a set of good surround speakers installed. Also, when creating your application, it is good to have the sounds placed in the 3D space appropriately using 3D spatialized audio. For a tutorial on how to use 3D sounds in Vizard, see this page in the documentation.
In order to validate a user’s implicit reactions to a simulation, it is highly advisable to use some sort of physiological measuring device. This can be measuring things such as heart rate, skin conductance, EEG, and a host of many other signals. One system that works seamlessly with the Vizard software is Acqknowledge and the Biopac Physiological measuring devices.
Eye tracking is growing in popularity in VR headsets, and can provide a lot of useful data of how a user is reacting to a simulation.
SightLab VR Pro
For help with setting up an eye tracking experiment and collecting data on things such as objects of fixation, average view time, heatmaps and much more, Worldviz offers SightLab VR Pro, an extension to the software Vizard that allows you to create virtual reality eye tracking experiments with little or no code. Access visualization and playback tools in a single user or multi-user environment. Additionally SightLab VR Pro allows connection to various hardware devices, such as BIOPAC physiological measurement systems and more. Works for both single and multi-users.
More information on SightLab VR Pro can be found here.
Quick Tips on Setting up a VR Experiment
For help on how to create an experiment using the VR application development engine Vizard, see this tutorial.
Additionally, WorldViz provides custom development services if you have a design in mind, but need help implementing it. Please contact firstname.lastname@example.org for more details.
Setting up a VR lab can bring a huge upgrade in your research. Initially it can be somewhat challenging and take some time, but with the proper setup you will have a much improved environment in which to perform your studies. For further help on how to setup a VR lab and discuss options, contact email@example.com