VR screenshot analysis. Planet scale issue

[Sparkam]

From time to time I play Elite Dangerous in VR (in my Samsung Odyssey HMD). Everything seems normal except for planets and stars.
Every time I fly up to the planet it seems to me that something is wrong with its scale. It looks as if the planet is small and is a few hundred meters from me.

I made some VR screenshots with SteamVR and tried to analyze them.

I placed an image for the right eye on top of the left eye image (Blending mode "Difference" in Photoshop). In my understanding, the farther away from us the object is, the less there must be a visible difference between the images in each eye.

Here is a clean starfield

Spoiler

https://drive.google.com/open?id=14xmXkc58X5quCyHDbHYBm80hVh6LkNu-

This is an attempt to match left and right images

Spoiler

https://drive.google.com/open?id=1Lj_bj8NEaqgBgYwCQKcId9H1rCJNyiIA

The stars don't match. The picture of the left eye is tilted downward compared to the right.


Attempt to shift the picture so that the stars coincide.

Spoiler

https://drive.google.com/open?id=1D9jIY4E9iSYHVLm7BTmTApGO5A6973SN

Still could not match the pictures. The farther from the center the greater the difference. It looks as if one picture is slightly tilted and stretched. Asymmetrical distortion.


Here is screenshot of stars and the sun above horizon from DCS World for comparison.

Spoiler

https://drive.google.com/open?id=1QN2dT_Ml8nW8Wpk-6rhXSEO5cHWjjVct

https://drive.google.com/open?id=1mhVLn5wFgo2JBLeSSikTQdsy8IPho5mB

Left-right difference. Almost exact match (pixel, subpixel difference).


Another one. Hud and Stars.

Spoiler

https://drive.google.com/open?id=1EaWp7yYWqxYt7bY1IO7ZqVJNcDypBrM6


https://drive.google.com/open?id=1SjYLVd4xkdQrkzNDWTCcmz19JIE29-VW

Again, close match.


Terrain from 81000 feet.

Spoiler

https://drive.google.com/open?id=1qUZkVegvK2jZ2DZQhJkHsxZUXPC1y36a


https://drive.google.com/open?id=114HxLyOkc9NbzSiy8lY4zRgbrtyCJPXz

You can clearly see the plane and almost no terrain.


A couple more screenshots from Elite.

Spoiler

https://drive.google.com/open?id=19h-Uy6TJ2sP-dPmA4lFWVKElNQztmno5

https://drive.google.com/open?id=10KdrRWg6xXH5YOs85DsoN-kvrj8hpa_4

https://drive.google.com/open?id=13qTErRCHMeUlgUB8uGXQwiz3daWre5Kd


https://drive.google.com/open?id=1PT2-59xW8K0HtBDUMeNRH-LGc5wnfTDL

https://drive.google.com/open?id=1CcQuhbqOssJFIwrHBS0h8Jic1ZqphVCJ


https://drive.google.com/open?id=1KxcrbqXFY5e9XsNmgxuEb59J6ojsnKVy

https://drive.google.com/open?id=1bmNMUXGJoyLbIDBDIZZjMjjmtcmbc2-j


Difference on the last image is pretty noticeable. Ideally this image should be entirely black.

Planet. Left-right eye image switch.
[video=youtube_share;DgcNom-ELb8]https://youtu.be/DgcNom-ELb8[/video]
Interestingly, when you look at screenshots in HMD, then the vertical offset is not noticeable.

There are some jpeg compression losses, so here is PSD file.
https://drive.google.com/open?id=1ny_y2AunIFpj80uFggTrRxfPjNeRtT6P


It's clearly something wrong with VR in ED. There is some asymmetric picture distortion for each eye. Hopefully, someone will look into this issue.

 

[Darkfyre99]

It’s called the Moon Illusion: https://en.m.wikipedia.org/wiki/Moon_illusion

In Space, there are no common frames of reference, so it’s hard to judge size. In addition, at distances more than a few meters, the degree of parallax between our eyeballs becomes negligible, even in real life, so it’s not surprising that you won’t see any difference when comparing screen shots of distant objects. We rely on moving our whole bodies, and common objects like trees and buildings, to accurately judge distant objects.

Nevermind, I think I just grokked what your talking about.

 

[Kaltern]

This is interesting, it might explain why I am forever seeing miscoloured stars in the starfield.

 

[Sparkam]

I wonder if this issue related to particular HMD.
Would be interesting to compare VR screenshots from vive, oculus, WMR.