tex3d: 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 - from package: piglit

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

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