How the battle to stop VR sickness will change game development forever

Posted on 10/14 18:36 in | 0

I was physically sick at E3 this year. No, I hadn’t had too much alcohol, too many showfloor hotdogs or a single drop of radioactive energy drink with 5000% of your recommended daily intake of vitamin B. All I did was don an Oculus Rift and put my head in World Rally Championship 6 for approximately 45 seconds. That was all it took. 

VR sickness doesn’t creep up slowly. It’s fast and unrelenting. One second you’re fine, taking in the instantly impressive 360 view of a living, roaring rally track, the next, there’s a thin layer of sweat covering your entire body and there’s an immediate desire to yank off the headset just to make it all stop. That’s not even mentioning your stomach, churning ominously like that time you drank too much eggnog when you were 14. It’s all enough to make you want to kneel with your head on cold tiles and never move again. I didn’t even complete a full lap before I thanked the concerned booth staff for their time, staggered away and then politely found a toilet to vomit. Welcome to the future, there goes your banana nut breakfast muffin.

But this thankfully isn’t my reaction to every virtual reality experience, and because we’re not all the same synths with the same wiring, it’s different for everyone. I’ve spent hours in the newly launched PlayStation VR headset without a single lurch, but speeding along in that rally car, bumping over rough terrain and screeching round corners was just too much. The disconnect between eyes and body beat my brain into furious submission. I’m not alone. GamesRadar hasn’t been able to officially review Driveclub VR because no one can wear the headset for longer than ten minutes without feeling dreadful. It’s not exactly a poster quote, but it’s the horrible truth. It turns out that driving games are exceptionally high on the vomit list but the question is why. 

It turns out that the answer is relatively simple. They simulate movement and intense speed. And that’s got nothing to do with whether you experience motion sickness or not. “I forget that people aren’t aware of the ‘locomotion problem’ as it’s called in VR community,” says Simon Reveley, CEO of Figment Productions, the company responsible for theme park Alton Towers’ rollercoaster Galactica, where riders don a Samsung Gear VR headset as they fly through the air. “The fact that VR is amazing because it’s one to one with the real world consequently means you can’t just push forward on a thumb stick and move your character at 40mph as they do in so many triple-A games. It’s one of the reasons why, when we came up with the idea of Vector VR, which is the overall system we’ve designed to run Galactica and other projects, the whole idea of VR has a problem. You can’t really move in a way that isn’t natural to your living room. The only viable way is to put people on a vehicle that moves and have that vehicle synchronise with the VR.” 

While you’d think that a rollercoaster and VR would be a fast ride to vomitville, it’s actually the complete opposite. Because this is no simulator - Galactica used to be Alton Towers’ flying ride, Air - rider’s bodies are going through exactly the motions of what’s being sent into their eyes. Reveley and his co-workers at Figment actually tested the original prototype with wheelie chairs on a fixed figure-of-eight loop in their office, before scaling it up to an actual roller coaster. “It allowed us to prove that if you do want to move in VR and you don’t want to throw up everywhere you do need to be moving physically in the real world as well,” Reveley confirms. 

“It’s an amazing piece of engineering and we are genuinely turning people upside down at 46 mph and that’s the only way to experience that kind of content in VR. The synchronicity of the two does create a really unique experience,” he continues. “It frustrates me that for a lot of people their first VR experience is to get hold of a headset and download a virtual rollercoaster. Then sit there, come off and say ‘Yeah, VR still makes you feel sick.’ It’s not the fact that VR makes you feel sick. It’s the fact that you are doing something fundamentally wrong with it. You’re trying to tell your brain that you’re moving upside down and moving at 50mph when you’re not. That disconnection is a significant flaw.”

Then how on earth are we meant to cope with games? Games that have literally evolved to the point where characters can go anywhere and do anything. VR titles such as Batman Arkham VR use teleport mechanics for jumping between locations without a lurch in sight. While Rocksteady’s Dark Knight can look around each area, his feet are static unless you see an icon that means you can blink to that location. Bang. All of the movement, none of the sickness. Then there’s the games that want you to feel like you’re moving, make your heart race and put you in the moment. How can these exist and not make us want to hurl? Well, they do, but it’s not been easy. 

Battlezone is a neon roguelike that pits you against enemies in giant arenas where you strafe and circle in the cockpit of an enormous tank. On paper that should mean sickness central, but I put on the PlayStation VR headset and played for a solid 45 minutes without even a waft of nausea, just the desire to shoot everything that moved. It felt incredible. I even played more after a cup of tea. And that’s all down to design. The team at Rebellion really want you to be able to play and enjoy yourself. “It’s an issue that we took very seriously right from the get go,” confirms Battlezone lead designer Steve Bristow. “And the first problem to face is that some of us are affected by it more than others. I can’t think of any occasion that I’ve ever felt the degree of discomfort in any VR experience where I’ve felt the need to take the headset off. But I have had experiences that were less comfortable than others, so I’m well aware of that.”

How do you measure the sick-osity of your game, though? You test it. Repeatedly. On staff members. “We have people here at Rebellion – our ‘canaries’ as we refer to them – who are extremely sensitive to it,” Bristow explains, conjuring up visions of a dev studio full of queasy green individuals. “And so our gauge, really, was if we can make the canaries feel tolerably comfortable, then we’re probably doing OK. It’s also the case, I believe, that over time, you get more and more used to the sensation and it therefore affects you less. The tricky thing with Battlezone is that I want the player’s stomach to move while they’re moving around; it has to be exhilarating, and I want to get something of that dynamic feeling that you get from VR. I don’t want to lose that completely, but obviously we want to fall short of making an unacceptable percentage of players have a negative experience because of it.”

The biggest changes to the game throughout development have been made simply to make people feel comfortable being in a virtual tank. That means everything from weaponry to environments have been made as sick-free as possible. It also meant ditching traditional games design in favour of something compatible with our bold new VR future. “The very first prototypes we did of the game, I had a kind of curving landscape,” explains Bristow. “There were game design reasons for this - having to do with the way that approaching enemies would present themselves as targets as they crested hills and disappeared behind rolling hills and so on. Similarly, because I started from the point of view of a contemporary tank game, I wanted to be able to drive over a slope to position my gun and then reverse back over that slope to get cover and so on... using the landscape in that way. But in our initial prototypes, that was causing a percentage of users – too high a percentage of users – a problem.” 

Sacrifices had to be made. “One of the things we did was settle on a sort of plateaued landscape for all of our levels, which was unquestionably a compromise in some respects, in terms of the gameplay, but one that we were able to counter with the introduction of things like the flying units and so on, to replace that kind of broad target field that you want in a first person shooter,” Bristow says. “After that, we realised that we needed to de-couple the head movement from the cockpit movement, so you can still rotate around and your viewpoint will go with the rotation, but if the vehicle rolls or tips, the head isn’t shifted at the same time. And that made a huge difference again, so much so that I think actually were we to have gone back to the rolling landscapes, they would have been much more tolerable with that decoupling, but we’d already kind of committed to the flat planes by that point.” 

Sickness dictated every stage of this development process and that’s a new idea. Did Naughty Dog have to worry about you getting car sick during that chase in Uncharted 4? Of course not. It just layered on explosion after explosion. VR literally requires sacrificing gameplay for humans to handle it. This is new territory for developers, and studios like Rebellion are leading the charge. 

Battlezone’s cockpit doesn’t just look attractive and make you want to touch everything, it also plays a key role in making you feel less nauseous as you strafe. Bristow can’t be too specific about how much of an effect it has because the science is so new, but there’s definitely a more secure feeling inside the tank. “The fact that you’re enclosed and surrounded by a solid-feeling structure that you’re sitting in, as you are when you play the game - that all feels quite natural and it helps to sell the illusion,” he says. “And it also gives you a sort of sense of, I suppose I want to say protection. You’re not completely exposed to the environment, and that again just helps slightly with the comfort level in general. I don’t know how directly it has a bearing on motion sickness, but I feel that were we to remove the cockpit and have just a sort of purely virtual HUD, you would feel a return to that more extreme sense of motion which may trigger that nausea.” Developers have never had to worry about gamers feeling safe before. Previously, the mantra has been the more dangerous, the better, but not in VR. If virtual reality is to thrive, designers are going to have to make sure we don’t just yank off headsets immediately. 

My favourite addition is the fact that the radar gimbals around as you hurtle about. It’s another physical object in a virtual world, that behaves just as you expect it to. Like Jurassic Park with tanks, Rebellion has spared no anti-nausea expense. “Essentially, that’s inspired by a device that is used on board ships, like warships and so on,” Bristow explains. “If you’ve got a cabin or a meeting room on a warship, they realised that without any reference to the horizon, if the room’s tipping around, your other senses and your inner ear disagree with one another and that can trigger this issue.” This not only makes sense, but it’s analogous to the crosshair in FPS games, without which people can be prone to sickness and discomfort. It makes sense to immerse you further in a VR experience with bespoke frames of reference.  

Yet this is all entirely subjective. There’s no easy solution, no magic wand to fix each individual’s personal inner ear. This is a physical issue, and given that there’s no way to add a rollercoaster to each living room, it’s going to be a constant fight. Environmental changes and gimbals are only a few of the additions made to the game to make enjoyable, but one man’s Battlezone might be another’s vomit-spattered WRC 6. The important thing is that thankfully, this isn’t stopping developers from trying. Static experiences are fun - Batman is brilliant - but this can’t be all that virtual reality has to offer. 

Battlezone is proof that you can get your head in a moving tank without feeling like I did at E3. There are clearly ways to chip away at an experience to fool your body even further into believing it’s actually there. More research into the science of sick is needed as PlayStation VR moves stylishly into more homes, but we’re hopefully on the right track. Game design has to change for this to succeed or our smart new gadgets will be lost beneath a sea of sick, but it can be done. Battlezone is only the beginning. New levels of smart game design will lead us to a nausea-free future, and I can’t wait to see it. 


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