tex3d-npot: 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 CentOS possible default full paths are:

/usr/lib64/piglit/bin/tex3d-npot - from package: piglit

You may install the required package with command yum install {package}

Error in other languages:
tex3d-npot: bevel nie gevind nie
tex3d-npot: comandă negăsită
tex3d-npot: comando não encontrado
tex3d-npot: commande introuvable
tex3d-npot: command not found
tex3d-npot: käsku ei ole
tex3d-npot: không tìm thấy lệnh
tex3d-npot: komanda nerasta
tex3d-npot: Kommando nicht gefunden.
tex3d-npot: kommandot finns inte
tex3d-npot: komut yok
tex3d-npot: nie znaleziono polecenia
tex3d-npot: níor aimsíodh an t-ordú
tex3d-npot: no se encontró la orden
tex3d-npot: no s'ha trobat l'ordre
tex3d-npot: opdracht niet gevonden
tex3d-npot: parancs nem található
tex3d-npot: perintah tidak ditemukan
tex3d-npot: príkaz nenájdený
tex3d-npot: příkaz nenalezen
tex3d-npot: команда не найдена
tex3d-npot: командата не е открита
tex3d-npot: 命令找不到
tex3d-npot: コマンドが見つかりません