osgfpdepth: 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/osgfpdepth - from package: openscenegraph

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

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