Problem number two is that I need to split it into 3 gemwindows, to show it on 3 walls synced together the 3 stripes into one big image.
Any hints are welcome.
maybe a decade+ old, but still working fine: Extended View. entirely made with Pd/GEM:
http://www.extendedview.mur.at/
This solves multiple projector things also with stitching etc... Anyhow doing one big screen as fullscreen and using the computers Monitor arrangement setting is what I mostly did, on linux a seperate X display for controlling the patch.
mfg winfried
Best, Popesz