Turn Your PC Screen into a VR Space
This page explains how to use the freely distributed Unity-chan Live Stage! for Portalgraph to enjoy an existing Portalgraph app. Using a standard PC monitor, webcam-based viewpoint tracking, and anaglyph (red-blue) glasses, you can experience a VR space that appears to emerge from inside your screen. This is designed for PC screens up to 30 inches, viewed from within 1 meter of the display.
Portalgraph generates imagery based on the screen's size and position along with the user's viewpoint. Because of this, the system requires calibration to understand the screen dimensions and how the camera sees the environment — this page will walk you through that process.
Requirements
Operating System: Windows 10 or later
Portalgraph Runtime Installation: Download here
Webcam
Red-Blue(Cyan) 3D Glasses:
How to Use
If the Portalgraph runtime is not yet installed, install it first.
https://portalgraph.itch.io/portalgraph-runtime
Next, download Unity-chan Live Stage! for Portalgraph, extract the archive, and double-click UnityChan CRS.exe to launch it.
https://portalgraph.itch.io/portalgraph-free-demos
The camera tracking app will launch automatically. Select your camera, click "Apply," and return to the Unity-chan Live Stage window.
*If the camera image is not displayed:
Close the camera tracking app and Unity-chan Live Stage, install the VC++ Runtime, and relaunch.
https://learn.microsoft.com/en-us/cpp/windows/latest-supported-vc-redist?view=msvc-170
Calibration
Portalgraph needs to know the size and coordinates of your screen in order to operate, so you will enter these values through calibration.
On the first launch of the Portalgraph application, the camera tracking calibration screen will be displayed. (If it does not appear, press F12 to open the settings screen, then click "Next" → "Camera.")
Enter your screen size.
Click "Close" and Unity-chan will appear inside your screen. Put on your anaglyph (red-blue) glasses to see her moving in 3D from any angle.
The Portalgraph application supports the following keyboard controls by default:
WASD R F — Move forward/back/left/right/up/down (hold Shift for slow movement)
Q E T G Z C — Rotate left/right, up/down, and tilt (hold Ctrl to rotate in 90° increments)
1 2 — Change scale
3 — Reset scale
Adjust the camera position, angle, and scale to match the size and orientation of your screen.
※ If the image appears distorted
Camera Adjustment
The camera tracking app is calibrated by default for the field of view (FOV) of a typical webcam. If your camera has a significantly different FOV, please calibrate the camera tracking app.
Click "Calibration" to begin a countdown. Position yourself so that your eyes are 50 cm directly in front of the camera and wait — the values will be set automatically.
Entering the Exact Screen Size
If your PC does not have a standard 16:9 display, or if the camera is not positioned directly above the center of the screen, the image may not display correctly. In that case, configure the following in the Unity-chan Live Stage! app.
Press F12 in the Unity-chan Live Stage window to open the settings screen.
Click "Next."
Click "Camera" to open the camera tracking calibration screen.
Check "Advanced Mode."
Measure your monitor's dimensions and enter the screen size in meters. For camera position, use the dropdown to select the camera's position relative to the screen (Top, Bottom, Left, Right, or Center), then enter the offset from that position in meters. The X, Y, and Z axes correspond to right, up, and forward relative to the screen, respectively. Enter the camera angle only if your camera is not perpendicular to the screen (this normally does not need to be changed).
Click "OK" → "Close" after entering your values and the image should display correctly.
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