VR Short Lesson 5
VR Resolution vs. what we see in real life
Depending on the VR headset we refer to, resolution varies drastically. Without taking into account Google Cardboard, the lowest resolution among the top VR headsets is on Play Station VR, while the greatest is… on the Gear VR! Yes! Neither Oculus nor HTC Vive. Surprised?
Oculus Rift (CV1)
|
HTC Vive
|
PlayStation VR
|
Samsung Gear VR
|
Google Cardboard
| |
Company
|
Oculus (FB)
|
Valve + HTC
|
Sony
|
Samsung+Oculus (FB)
|
Google
|
Platform
|
PC
|
PC
|
PlayStation 4
|
Note4, S6
|
Android
|
FOV
|
110º
|
110º
|
100º
|
96º
|
80/90º
|
FPS
|
90 Hz
|
90 Hz
|
120/90 Hz
|
60 Hz
|
60 Hz
|
Resolution
|
1080x1200
|
1080x1200
|
960x1080
|
1280x1440
|
-
|
Tracking
|
Camera
|
Room
|
Camera
|
No
|
No
|
Wireless
|
No
|
No
|
No
|
Yes
|
Yes
|
Ok well, but how do we measure resolution? In virtual reality, we measure it based on PPD (pixels per degree). This parameter depends on both screen pixels and FOV (Field of View). Let’s take Gear VR as our illustrative example:
* Headset: GearVR
* Screen resolution: 2560x1440 pixels, thus 1280x1440 per eye (half of the screen for each)
* FOV: 96º
* Screen resolution: 2560x1440 pixels, thus 1280x1440 per eye (half of the screen for each)
* FOV: 96º
* Horizontal PPD: 1280 / 96 = 13.4
* Vertical PPD: 1440 / 96 = 15.0 pixels per degree
This means that if we spin 360º horizontally, we can appreciate 360º x 13.4 PPD = 4824 pixels. Similarly, moving vertically our head up to 180º, we can see 180º x 15 PPD = 2700 pixels.
If we apply this formula to obtain the resolution in real life, our eyes shall capture 60 PPD with 210º/100º of FOV (horizontally and vertically respectively). This entails 12,600x6,000 pixels in view, nothing compared to 1,280x1,440 of GearVR.
It seems we are very far from achieving a digital resolution similar to the one in real life, isn’t it? Well, the guys in the picture below is Michael Abrash, Chief Scientist at Oculus, and he predicted 4K pixels per eye in solely 5 years during the annual presentation at Oculus Connect 2016. Skip the intro and jump into this part at 10:02
It seems we are very far from achieving a digital resolution similar to the one in real life, isn’t it? Well, the guys in the picture below is Michael Abrash, Chief Scientist at Oculus, and he predicted 4K pixels per eye in solely 5 years during the annual presentation at Oculus Connect 2016. Skip the intro and jump into this part at 10:02
If he doesn't convince you, take a look here to the evolution of mobile screen resolution from 1998 till 2016, and then do the math.
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