The obj file is not displayed as a mesh.

Anton1978

Good day.
I continue to study 3D.
Now I'm trying to add an object from obj to the scene.
Here's what happened:

import QtQuick 2.12
import QtQuick.Window 2.12
import QtQuick3D 1.15
import Qt3D.Core 2.15

import QtQuick3D.Helpers 1.15

import Qt3D.Extras 2.15

Window {
    id: root
    width: 800
    height: 600
    visible: true
    title: qsTr("Hello World")

    View3D {
        id: view
        anchors.fill: parent

        environment: SceneEnvironment {
            clearColor: "skyblue"
            backgroundMode: SceneEnvironment.Color
        }

        PerspectiveCamera {
            id: mainCamera
            position: Qt.vector3d(0, 500, 500)
            eulerRotation.x: -50
        }

        WasdController  {
            controlledObject: mainCamera
        }

        DirectionalLight {
            eulerRotation.x: -30
            eulerRotation.y: -70
        }

        MegaTeaport {
            id: teaport
        }
    }
}

and the MegaTeaport.qml file

import Qt3D.Core 2.0
import Qt3D.Render 2.0
import QtQuick3D 1.15

Entity {
    id: root
    property Material materials: DefaultMaterial {diffuseColor: "green"}

    components: [ transform, mesh, root.material ]

    Transform {
        id: transform
        translation: Qt.vector3d(0, 0, 0)
        scale: 0.5
    }

    Mesh {
        id: mesh
        source: "new/prefix1/Items/trefoil.obj"
    }
}

Everything is assembled without errors, but the window is empty.
At first I thought that I might need to process the file before importing it, but when I inserted the file from the example (Qt 3D: Wireframe QML Example) into the code, the situation did not change.
That means it's not about the file, I'm stupid.
I also suspect that I have not attached the material correctly.
What can be wrong?

Anton1978

I figured it out, you can load obj only using SceneLoader, and in its turn it must be packed into Entity.
Confusingly, examples like Qt Quick 3D - Simple Example.

film

Can you share the code with me?