Stacked projections are best calibrated using VIOSO Calibrator as a standalone program and follow the steps below to perform a camera based calibration:

1. Set up the graphics outputs

We recommend to use display spanning, e.g. using NVIDIA Mosaic, or display expanders. However, depending on the hardware and concept of the media servers the stacking workflow also works on individual displays.

Example:
You are using a 4-head mediaserver and want to do a 2-projector panorama as a double stack of FullHD projectors. Combine each 2 outputs as a virtual stretched display (nVidia mosaic or similar) of 3840x1080px, so you end up with two wide stretched virtual displays with 3840x1080px each afterwards. Each display group will represent its own projection stack level and has to be cabled that way.

2.  Perform a camera based calibration for each stack level separately.

Start VIOSO Calibrator as standalone application. As targets you will see your two “wide” displays as display compounds. Please make sure to set the correct split settings in the options for each of them. Perform a separate camera based calibration for each display compound. Do not close the calibrator program in between.

3. Combine the calibrations and export 

Select “Stack compound calibrations” from the Calibration menu. After the calculation has been done, make sure that the “stacking mode” checkbox is selected. Activate the calibration with the “Preview” button and verify your stacked projection using an appropriate test image. If everything is satisfactory, go to menu “File-Export” and export in the appropriate way for the video playback system (VWF, MPCDI, etc.)

4. Check screen settings in the video application and import calibration.

Using our example from above, make sure that you have two outputs in your video application resembling this setup (2x displays with  3840×1080 resolution). Please note that these resolutions do not represent the real world situation. The resolution and aspect ration of the content space will entirely be set by the VIOSO calibration process. Depending on the video playback solution, you either need to run the content twice for each display, or probably you can simply run as one screen (or canvas or whatever concept the video application uses) with all projectors mapped to the same.