This is a Kodi visualization addon.
The following instructions assume you will have built Kodi already in the kodi-build
directory
suggested by the README.
git clone --branch master https://github.com/xbmc/xbmc.git
git clone --branch Nexus https://github.com/xbmc/visualization.matrix.git
cd visualization.matrix && mkdir build && cd build
cmake -DADDONS_TO_BUILD=visualization.matrix -DADDON_SRC_PREFIX=../.. -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=../../xbmc/kodi-build/addons -DPACKAGE_ZIP=1 ../../xbmc/cmake/addons
make
The addon files will be placed in ../../xbmc/kodi-build/addons
so if you build Kodi from source and run it directly
the addon will be available as a system addon.