osgsimplegl3: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/osgsimplegl3 - from package: openscenegraph

You may install the required package with command apt-get install {package}
Error in other languages:
osgsimplegl3: bevel nie gevind nie
osgsimplegl3: comandă negăsită
osgsimplegl3: comando não encontrado
osgsimplegl3: commande introuvable
osgsimplegl3: command not found
osgsimplegl3: käsku ei ole
osgsimplegl3: không tìm thấy lệnh
osgsimplegl3: komanda nerasta
osgsimplegl3: Kommando nicht gefunden.
osgsimplegl3: kommandot finns inte
osgsimplegl3: komut yok
osgsimplegl3: nie znaleziono polecenia
osgsimplegl3: níor aimsíodh an t-ordú
osgsimplegl3: no se encontró la orden
osgsimplegl3: no s'ha trobat l'ordre
osgsimplegl3: opdracht niet gevonden
osgsimplegl3: parancs nem található
osgsimplegl3: perintah tidak ditemukan
osgsimplegl3: príkaz nenájdený
osgsimplegl3: příkaz nenalezen
osgsimplegl3: команда не найдена
osgsimplegl3: командата не е открита
osgsimplegl3: 命令找不到
osgsimplegl3: コマンドが見つかりません