How do I set the center of rotation of a Qt3D scene to the center of the active .obj file in the scene?

Danny141

import QtQuick.Scene3D 2.13
import Qt3D.Core 2.13
import Qt3D.Render 2.13
import Qt3D.Input 2.13
import Qt3D.Logic 2.13
import Qt3D.Extras 2.13

import QtQuick.Controls 2.5
import QtQuick.Dialogs 1.3
import QtQuick 2.5 as QQ2

ApplicationWindow
{
visible: true
width: 1050
height: 780
title: qsTr("3D Viewer")
flags: Qt | Qt.Window | Qt.FramelessWindowHint

header: ToolBar
{
    ToolButton
    {
        text: "Open 3D Model"
        onPressed:
        {
            fileDialog.open()
        }
    }
}



Scene3D
{
    anchors.fill: parent

    aspects: ["input", "logic"]
    cameraAspectRatioMode: Scene3D.AutomaticAspectRatio

    Entity {
        id: sceneRoot


        Camera {
            id: maincamera
            projectionType: CameraLens.PerspectiveProjection
            fieldOfView: 60
            aspectRatio:16.0 / 9.0
            nearPlane : 0.1
            farPlane : 1000.0
            position: Qt.vector3d( 0.0, 0.0, 30.0 )
            upVector: Qt.vector3d( 0.0, 1.0, 0.0 )
            viewCenter: Qt.vector3d( 0, 0, 0 )

        }



       FirstPersonCameraController {
                      camera: maincamera
                  }



       ObjectPicker{
          id: spherePicker
          onPressed:{
             console.log(maincamera.viewVector)
          }
       }

        components:[
            RenderSettings {
                activeFrameGraph: ForwardRenderer {
                camera: maincamera
                clearColor:"#333333"
                }
            },

            InputSettings { }
        ]

        PhongMaterial {
           id: material
           diffuse:"#CECECE"
        }

        TorusMesh {
            id: torusMesh
            radius:15
            minorRadius:6
            slices:16
            rings:32
            //source: "Monkey.obj"

         }
        Transform {
                id: torusTransform

                translation: Qt.vector3d(0, 0, 0)
            }

        Entity {
            id: torusEntity
            components: [ torusMesh, material, spherePicker,torusTransform]
        }


        Entity {
            id:pointLightEntity1
            PointLight{
                id:pointLight1
            }

            Transform{
                id:lightTransform1
                translation:Qt.vector3d(0.0, 0.0, 30)
            }

            components:[pointLight1,lightTransform1]
        }

        Entity {
            id:pointLightEntity2
            PointLight{
                id:pointLight2
            }

            Transform{
                id:lightTransform2
                translation:Qt.vector3d(0.0, 0.0, 30)
            }

            components:[pointLight2,lightTransform2]
        }



    }

}

}