MiddleVR is a Unity plugin designed to enable the deployment of Unity applications to VR systems such as Walls, CAVEs, and other cluster rendering systems.

This guide shows you how to integrate your VIOSO projection calibration into MiddleVR.

1. In VIOSO

• • Export your calibration in the VWF format. Learn more about that here.
  • Create an .ini file for each display in the format below. You only need to change calibFilepath (exported mapping from VIOSO), [Channel_Name] (of your choice) and calibIndex :

[default]
logLevel=2
bLogClear=0 ;clear log file on start
base=[1000,0,0,0; 0,1000,0,0; 0,0,1000,0; 0,0,0,1] ; frontal cam left handed, row major, most DX
near=0.15 ; the minimum rendering distance, all faces closer than that are culled
far=20000 ; the maximum rendering disctance, all faces futher than that are culled
bTurnWithView=0 ; set to true, if moving platform alas world turns with view direction
bicubic=0 ; set to true to enhance sampling acuracy, will use up some extra GPU
calibFile=C:\Users\Public\Documents\VIOSO\VIOSOPlayer\Export\MyCalib.vwf
autoViewC=1 ;widen FoV to cover a range of autoViewC * screen
bAutoView=1 ;overwrites screen fov and dir
[Channel_1]
calibIndex=0

2. in Middle VR 2.1+

You can also find these steps in the MiddleVR Documentation

https://www.middlevr.com/2/doc/2.1.0.0/CfgWarping.html#vioso

1. 1. in 3D nodes: Start by adding a new Vioso Warper
   2.  Enter the configuration file and channel name. You can find a template of a .ini file in MiddleVR2/data/Vioso_MiddleVR_Template.ini


1. Assign the warper to a Camera
   
2. Your VIOSO calibration is now integrated.
   • Go back to the APPS tab and click on RUN.

2. In MiddleVR 2.0 (legacy)

To add the VIOSO calibration:

• Open MiddleVRConfig.exCreate a new Configuration: File > New

• Go to the 3D Nodes tab. Then add a screen for each of your displays.

• In the screen properties, scroll down to ADVANCED and add the corresponding Configuration file path (.ini file) and Channel Name (that you chose in the.ini) . Then press ENTER.
  You should now see the coordinate values locked and overwritten by the loaded warper.

Repeat this step for each of the screens. 

• Now add a Camera for each display and assign it to its screen.

• In the Viewports Tab, create a viewport for each display and assign its camera

Your VIOSO calibration is now integrated.

• Go back to the APPS tab and click on RUN.

3. Troubleshooting

• In the Displays section, make sure the Window Mode is set to Compositor or Proxy
• Check the VIOSO log file here: C:\Users\[YourUserName]\AppData\Local\Temp\MiddleVR\MiddleVR_2023-06-29\MiddleVR_Vioso_1.log

Field of view adjustment

Moving the camera far away from the screen can result in black borders appearing around the screen. To fix this, you can adjust the field of view coverage by increasing the autoViewC variable in the .ini files until you get no visible black borders on the edges.

Multi-Cluster Setup

To run middleVR on several clusters with a VIOSO calibration make sure you take into consideration these measures:

• Calibration files (.vwf) and configuration files (.ini) must be available on all clusters with the same path. It is recommended to use local drives instead of a common network drive for better performance.
• Assign a viewport to every cluster. In case one cluster node is not part of the projection calibration, simply create a standard screen and camera for it in the 3D nodes tab.
• Follow the cluster configuration guide from middleVR for the initial setup of your multi-cluster system.