Browser window is too low in Oculus Quest

[MortimerGoro]

@thenadj and @jvonitter mentioned that the position of the window on the Quest feels different (and really low) than on the Go.

It's probably related to the initial height set up in Oculus Quest. I'll take a look.

[MortimerGoro]

@jvonitter @thenadj I tested this and I think it works as expected.

No matter in which position the user opens the app, the initial height of the user is always the same as Oculus Go: 1.75m. From that position your movements can affect the scene height:

• If you open the app while seated and you stand up the browser window will look in a lower position because you are "taller" now
• If you open the app while standing and then you sit or lie in the floor the window will be in a higher position because you are looking it from above.

In both cases you can reset the pose to the standard height just using the recenter button in the controller or using the HMD off/on button (each time you remove and put the headset this is recentered too).

@jvonitter @thenadj can you confirm the issue come from any of those position changes or give STR if that's not the case?

The alternative would be to always use a fixed scene height based on the floor level. But this may come with some problems:

• Each user will see a slightly different view initially based on their height or the position they open the app.
• It's harder make both sitting and standing comfortable. If we adjust the perfect view for one the other would be affected (browser high or low). Oculus browser seems to use a taller window so the height position seems to have less impact than in our case.
• You can't reset the height as we are doing now

[MortimerGoro]

I created this PR to simplify some math we are doing: #1512. It shouldn't affect this unless there was some bug in the offsets we calculated.

[MortimerGoro]

After some conversations with @jvonitter we confirmed that the initial view is the same in Oculus Go and Quest. So this problem is not related to the Quest positional tracking math.

Janice thinks we should place the window a bit higher:

On the image above the yellow box is where the current center of view is. The circle is where @jvonitter thinks it should be.

[MortimerGoro]

Fixed in #1548

@jvonitter if there is any feedback to address please reopen it

[jvonitter]

@MortimerGoro We reviewed it a bunch on different devices and decided higher is better, but that this is a little too high. Please lower it to be between where it was before and where it is now.