osgprerender: command not found

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/osgprerender - from package: openscenegraph

You may install the required package with command apt-get install {package}

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