3 ms·

What's the resolution in terms of a screen? Like height by width in pixels? Sorry if that's obvious from your comment, coming at this with just basic consumer k

What's the resolution in terms of a screen? Like height by width in pixels? Sorry if that's obvious from your comment, coming at this with just basic consumer knowledge about displays.

dsr_ 6y ago
The eye doesn't care about pixels, the eye cares about the smallest detail that it can distinguish. If you specify a particular distance you can figure out how small the pixels have to be at that range so that you can't see them. It's around one half of an arc-minute, which is to say, 1/120th of a degree. https://en.wikipedia.org/wiki/Visual_acuity https://en.wikipedia.org/wiki/Visual_acuity is a really useful overview. Now, we know that human eyes can only cover a little less than 180 degrees horizontally, and about 135 degrees vertically, so we could multiply each of those by 120 and get: 180 * 120 = 21600 across by 135 *120 = 16200 down. That's a screen where every pixel is guaranteed not to be distinguishable from the ones around it. If you had this on a hemispherical screen 10cm from your eye, your square pixels need to be no larger than 0.0145 mm on a diagonal, or if you prefer have a dot pitch of 0.0145 mm. Current state of commercial availability smartphone screens have dot pitches of about 0.045 mm, about 3 times too big. Does that help?
- npunt 6y ago
  Probably can cut that down further due to : * People's vision getting worse with age * Each OLED pixel consists of 4 subpixels, so may only need to reach that acuity at sub pixel resolution * Acuity drops and eyestrain increases at the edges of vision so likely only need maybe 75% of our range U/D L/R at the highest resolution, and the outer edges can have much lower resolution Other hacks for foveated rendering include rendering peripheral vision at lower resolution and monochromatic, and not rendering in the blind spot, since our brains will just fill in those areas. May not be worth the complexity, but there's a lot of hacks that could take advantage of our visual system's quirks. I imagine ray tracing makes these hacks even easier to implement.
trevortheblack 6y ago
From the logic of the GP, that would be: Height: 135 * 60 (135 degrees at 60 pixels per degree) Width: 180 * 60 So 87 megapixels, or a 10.8K display with a 4:3 aspect ratio

What's the resolution in terms of a screen? Like height by width in pixels? Sorry if that's obvious from your comment, coming at this with just basic consumer knowledge about displays.

dsr_ 6y ago

The eye doesn't care about pixels, the eye cares about the smallest detail that it can distinguish. If you specify a particular distance you can figure out how small the pixels have to be at that range so that you can't see them. It's around one half of an arc-minute, which is to say, 1/120th of a degree. https://en.wikipedia.org/wiki/Visual_acuity https://en.wikipedia.org/wiki/Visual_acuity is a really useful overview. Now, we know that human eyes can only cover a little less than 180 degrees horizontally, and about 135 degrees vertically, so we could multiply each of those by 120 and get: 180 * 120 = 21600 across by 135 *120 = 16200 down. That's a screen where every pixel is guaranteed not to be distinguishable from the ones around it. If you had this on a hemispherical screen 10cm from your eye, your square pixels need to be no larger than 0.0145 mm on a diagonal, or if you prefer have a dot pitch of 0.0145 mm. Current state of commercial availability smartphone screens have dot pitches of about 0.045 mm, about 3 times too big. Does that help?

npunt 6y ago
Probably can cut that down further due to : * People's vision getting worse with age * Each OLED pixel consists of 4 subpixels, so may only need to reach that acuity at sub pixel resolution * Acuity drops and eyestrain increases at the edges of vision so likely only need maybe 75% of our range U/D L/R at the highest resolution, and the outer edges can have much lower resolution Other hacks for foveated rendering include rendering peripheral vision at lower resolution and monochromatic, and not rendering in the blind spot, since our brains will just fill in those areas. May not be worth the complexity, but there's a lot of hacks that could take advantage of our visual system's quirks. I imagine ray tracing makes these hacks even easier to implement.

trevortheblack 6y ago

From the logic of the GP, that would be: Height: 135 * 60 (135 degrees at 60 pixels per degree) Width: 180 * 60 So 87 megapixels, or a 10.8K display with a 4:3 aspect ratio