osgtessellate: 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/osgtessellate - from package: openscenegraph

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

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