How can I show in the screen 3D Render

[mxrm]

I'm new to Qt 3D, I want to render a 3D model (OBJ file) in the screen I read in Qt Documentation that I can use Viewport and Mesh to load the file. But I did not find how to send to screen my current Mesh.

Bellow a sample of my code. Let me know your suggestions.

Thanks!

import QtQuick 2.7 as QQ2
//import QtQuick.Controls 2.0
//import QtQuick.Layouts 1.3

import Qt3D.Core 2.0
import Qt3D.Render 2.0

import Qt3D.Input 2.0
//import Qt3D.Logic 2.0
import Qt3D.Extras 2.0
//import Qt3D.Animation 2.0

Viewport {
    id: root

    Mesh{
        id: mesh
        source: "braz.obj"
    }

}