My Convoluted VRChat Google Meet Setup

Published on 02/24/2021, 1788 words, 7 minutes to read

Recently the place I work for sent us all VR headsets. I decided to see what it would take to use that headset to make my camera show a virtual avatar instead of my meat body face. This is the story of my journey through chaining things together to make work meetings a bit more fun by using a 3D avatar instead of myself in some of them.

<Mara>

This post uses SVG for diagrams to help explain what's going on here. You may need to use a browser with SVG support in order to get the best experience with this article. All the diagrams will be explained after the fact so that people using screen readers are not left out.

So, let's cover the basics from a high level. At a high level a webcam is just a video source that may or may not have a microphone attached to it. So in order to get my avatar to show up in a video call, I need some way to make some window on my computer act as a webcam. This will make the overall dependency list look like this (for those of you using screen readers I will describe this diagram below):

VRChat renders to the Desktop which is picked up by OBS which has the ability to pretend to be a webcam, which is finally picked up by Google Meet.

If the VR headset that I got from work was a tethered to the PC kind of VR headset like the Valve Index or HTC Vive, the next steps would involve full body tracking or something so that I could have my movements in real life transfer into movements that my avatar makes.

However, the VR headset we got sent was an Oculus Quest 2. This is a standalone VR headset that is basically an Android tablet that you strap to your face. This makes things a bit more technically challenging because now you need some way to get the video to the headset and the motion tracking data from the headset and to the computer at 90 times per second. This requires a bit more cleverness.

The Oculus desktop software ships with a feature called Oculus Link that allows you to use a gaming PC to render the VR data to your headset by sending the video streams over USB. I had to dig around for a compatible cable (It needs to be a specific kind of USB-3 to USB-C-3 cable with at least 5 gigabits per second of transfer capacity) since the ones that Oculus sells are both at least CAD$110 and out of stock anywhere I can find them in Canada. The 0.75 meter long cable I had been using was good enough to get me through the first couple days of experimenting with VR, but it was clear that a better solution was needed.

I did some digging and found a bit of software called ALVR that claimed to let me do VR from my computer wirelessly. So I set it up on the Quest and on my tower, which brought up the dependency graph to this:

ALVR talks with its counterpart on the Quest. This allows you to stream the VR video and audio bidirectionally. You also need to bring Virtual Audio Cable into the setup so that you can hear stuff in the game and so that other people can hear you using the headset mic. However, ALVR is not available on the Quest store. You need to install SideQuest for that.

<Mara>

SideQuest lets you sideload Android APK files to your Quest 2 because the Quest 2 is basically an Android tablet that you strap to your face!

So I used SideQuest to install the ALVR client on my Quest 2, and then I opened up VRChat and was able to do everything I was able to do with the wired cable. It worked beautifully until it didn't. I started running into issues with the video stream just dying. The foveated encoding (tl;dr: attempting to hack the image quality based on how eyes work so you don't notice the artifacting as much) could only do so much and it just ended up not working. Even when I was only doing it for short amounts of time. There is a lot of WiFi noise in my apartment or something and it was really interfering with ALVR's stream encoding. The latency was also noticeable after a bit.

However, when it worked it worked beautifully. I had to upgrade to the nightly build of ALVR in order to get game audio and the headset mic working, but once it all worked it was really convenient. I could walk around my apartment and I'd also walk around in-game.

A friend told me that the best experience I could have with wireless VR using a Quest 2 would be to use Virtual Desktop. Apparently Virtual Desktop has a patch that enables SteamVR support, so I purchased Virtual Desktop on a whim and decided to give it a go.

Virtual Desktop made ALVR look like a tech demo. All of the latency issues were solved instantly. Virtual Desktop also made it convenient for me to access my tower's monitors while in VR, and it has the best typing experience in VR that I've ever used.

This brings the dependency graph up to this:

Now all that was left was to make the camera view look somewhat like it does when I'm using my work laptop's webcam to make video calls. I started out by taking a picture of my office from about the angle that my laptop sits at. I ended up with this image:

Then with some clever use of the Chroma key filter in VRChat I was able to get some basic compositing of my avatar onto the picture. I fiddled with the placement of things and then I was able to declare success with this image I posted to Twitter:

And it worked! I was able to make a call in Google Meet to myself and my avatar's lip movements synchronized somewhat with the words I was saying. I had waifu mode enabled!

However, this setup was really janky. I didn't actually get the proper angle for what my work laptop's camera would actually see. Everything was offset to the side and it was at way the wrong angle in general. I'm also not sure if I messed up the sizing of the background image in the OBS view, it looks kinda stretched on my end as I'm writing this post.

So I decided that the best way to get the most accurate angle was to record a video loop using my work laptop's webcam. After some googling I found webcamera.io which let me record some footage of my office from my work laptop's camera angle. I got down under the desk (so I was out of view of the camera) and then recorded a 45 second loop of my office doing nothing (however the flag was slightly moving in the breeze from the desk fan).

I also found a VRChat world that claimed to be as optimized as you could possibly make a VRChat world. It was a blue cube about 30m by 30m. Checking with SteamVR it brought my frame times down to 3 milliseconds with the stream camera set up for OBS. It looks like this:

It's very minimal. You can make the walls go away if you want, which somehow makes it render faster on my RX5700. I'm not sure what's going on there.

<Mara>

I'd heckin' love to get a new GPU but until the Bitcoin prices go down we may be stuck with this setup for a while. An RTX 3070 would really be useful about now.

Anyways, with this minimal world incurring very little to no GPU load, I was free to do video calls all I wanted. I even did a call with the CEO of the company I work for with a setup like this. It was fun.

Now I had everything set up. I can pop on the headset, load up the world, open OBS, VRChat, Virtual Desktop and get everything set up in about 5 minutes at worst. Then I can use the seeing your desktop side of Virtual Desktop to actually watch the meeting and be able to see screen sharing. They can hear me because Virtual Desktop pipes the headset microphone audio back to my tower, and the meeting audio comes over my headphones.

Also at some point I needed to bring AutoHotKey into the mix, so I borrowed this AutoHotKey script from SuperUser to resize the VRChat window so that it would fit perfectly into the OBS view:

#=:: ; [Win]+[=]
    WinGet, window, ID, A
    InputBox, width, Resize, Width:, , 140, 130
    InputBox, height, Resize, Height:, , 140, 130
    WinMove, ahk_id %window%, , , , width, height
    return

Making the VRChat window smaller also helped with the frame times, because it needed to render less detail per frame. This helped push the framerate comfortably above 72 FPS in my VR view.

That is how I get a 3d avatar to show up instead of pictures of the meat golem I am cursed inside of for work meetings. I will also use this for streaming coding in the future, so you can all witness the power of a VTube coding stream where I write Rust or something.

Facts and circumstances may have changed since publication. Please contact me before jumping to conclusions if something seems wrong or unclear.

Tags: oculusquest2, vr, vrchat