Screen Shake In VR, Minus The Throwing Up

In first-person games, an effective way to heighten immersion is to give the player a sense of impact and force by figuratively shaking the camera. That’s a tried and true practice for FPS games played on a monitor, but to [Zulubo]’s knowledge, no one has implemented traditional screen shake in a VR title because it would be a sure way to trigger motion sickness. Unsatisfied with that limitation, some clever experimentation led [Zulubo] to a method of doing screen shake in VR that doesn’t cause any of the usual problems.

Screen shake doesn’t translate well to VR because the traditional method is to shake the player’s entire view. This works fine when viewed on a monitor, but in VR the brain interprets the visual cue as evidence that one’s head and eyeballs are physically shaking while the vestibular system is reporting nothing of the sort. This kind of sensory mismatch leads to motion sickness in most people.

The key to getting the essence of a screen shake without any of the motion sickness baggage turned out to be a mix of two things. First, the shake is restricted to peripheral vision only. Second, it is restricted to an “in and out” motion, with no tilting or twisting. The result is a conveyance of concussion and impact that doesn’t rely on shaking the player’s view, at least not in a way that leads to motion sickness. It’s the product of some clever experimentation to solve a problem, and freely downloadable for use by anyone who may be interested.

Speaking of fooling one’s senses in VR environments, here is a fascinating method of simulating zero gravity: waterproof the VR headset and go underwater.

[via Reddit]

Hackaday Prize Entry: Diagnosing Concussions

Athletes of every age receive a lot of blows to the head. After a few years of this and a lot of concussions, symptoms similar to Alzheimer’s can appear. For his Hackaday Prize entry, [Mihir] wanted to build a simple device that could be given to high school coaches that would diagnose concussions. He came up with HeadsUp, a device so simple even a high school gym teacher could use it.

The origins of HeadsUp began as an augmented reality device, but after realizing that was a difficult project, pivoted to something a bit easier and even more useful. HeadsUp tracks the wearer’s eye movements with a webcam while a series of LEDs strobe back and forth in front of the wearer’s eyes. This is the fastest and easiest way to test for a concussion, and making this automated means it’s the perfect device to throw in a gym bag.

Hackaday Prize Entry : Impact – A Head Concussion Monitor

A lot of young athletes who get concussions each year go undiagnosed, leading to brain injury. [Hunter Scott] is working on a device called Impact to help detect these events early. According to this article which discusses the issue of concussion recognition and evaluation, “Early identification on the sports sideline of suspected concussion is critical because, in most cases, athletes who are immediately removed from contact or collision sports after suffering a concussion or other traumatic brain injury will recover without incident fairly quickly. If an athlete is allowed to keep playing, however, their recovery is likely to take longer, and they are at increased risk of long-term problems”

The device is a dime sized disk, which has an ATTiny85 microcontroller, memory to hold data, an accelerometer and a LED which gets activated when the preset impact threshold is breached, all driven by a coin cell. This small size allows it to be easily embedded in sports equipment such as helmets. At the end of a game, if the LED is blinking, the player is then screened for a concussion. For additional analysis, data stored on the on-board memory can be downloaded. This can be done by a pogo-pin based docking station, which is what [Hunter Scott] is still working on.

He’s having a functional problem that needs fixing. The ATTiny85 cannot be programmed with the accelerometer populated. He first needs to populate the ATTiny85, program it, and then populate the accelerometer. He’s working in fixing that, but if you have any suggestions, chime in on the comments below. We’d like to add that [Hunter] is a prolific hacker. His project, the Ultra-wideband radio module was a Hackaday Prize semi-finalist last year.

The 2015 Hackaday Prize is sponsored by: