- Qt 6.7
- Qt Quick 3D
- Qt Quick 3D Examples and Tutorials
- Qt Quick 3D - Picking example
- Qt Quick 3D | Commercial or GPLv3

# Qt Quick 3D - Picking example

     // Copyright (C) 2019 The Qt Company Ltd.
     // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

     import QtQuick
     import QtQuick.Controls
     import QtQuick3D

     Window {
         visible: true
         width: 800
         height: 500
         title: qsTr("Picking Example")
         color: "#848895"

         Row {
             anchors.left: parent.left
             anchors.leftMargin: 8
             spacing: 10
             Column {
                 Label {
                     color: "white"
                     font.pointSize: 14
                     text: "Last Pick:"
                 }
                 Label {
                     color: "white"
                     font.pointSize: 14
                     text: "Screen Position:"
                 }
                 Label {
                     color: "white"
                     font.pointSize: 14
                     text: "UV Position:"
                 }
                 Label {
                     color: "white"
                     font.pointSize: 14
                     text: "Distance:"
                 }
                 Label {
                     color: "white"
                     font.pointSize: 14
                     text: "World Position:"
                 }
                 Label {
                     color: "white"
                     font.pointSize: 14
                     text: "Local Position:"
                 }

                 Label {
                     color: "white"
                     font.pointSize: 14
                     text: "World Normal:"
                 }
                 Label {
                     color: "white"
                     font.pointSize: 14
                     text: "Local Normal:"
                 }
             }
             Column {
                 Label {
                     id: pickName
                     color: "white"
                     font.pointSize: 14
                 }
                 Label {
                     id: pickPosition
                     color: "white"
                     font.pointSize: 14
                 }
                 Label {
                     id: uvPosition
                     color: "white"
                     font.pointSize: 14
                 }
                 Label {
                     id: distance
                     color: "white"
                     font.pointSize: 14
                 }
                 Label {
                     id: scenePosition
                     color: "white"
                     font.pointSize: 14
                 }
                 Label {
                     id: localPosition
                     color: "white"
                     font.pointSize: 14
                 }
                 Label {
                     id: worldNormal
                     color: "white"
                     font.pointSize: 14
                 }
                 Label {
                     id: localNormal
                     color: "white"
                     font.pointSize: 14
                 }

             }
         }

         View3D {
             id: view
             anchors.fill: parent
             renderMode: View3D.Underlay

             PointLight {
                 x: -200
                 y: 200
                 z: 300
                 quadraticFade: 0
                 brightness: 1.5
             }

             PerspectiveCamera {
                 z: 500
             }

             Model {
                 id: cubeModel
                 objectName: "Cube"
                 source: "#Cube"
                 pickable: true
                 property bool isPicked: false

                 scale.x: 1.5
                 scale.y: 2
                 scale.z: 1.5

                 materials: DefaultMaterial {
                     diffuseColor: cubeModel.isPicked ? "#41cd52" : "#09102b"
                     specularAmount: 0.25
                     specularRoughness: 0.2
                     roughnessMap: Texture { source: "maps/roughness.jpg" }
                 }

                 SequentialAnimation on eulerRotation {
                     running: !cubeModel.isPicked
                     loops: Animation.Infinite
                     PropertyAnimation {
                         duration: 2500
                         from: Qt.vector3d(0, 0, 0)
                         to: Qt.vector3d(360, 360, 360)
                     }
                 }
             }

             Model {
                 id: coneModel
                 objectName: "Cone"
                 source: "#Cone"
                 pickable: true
                 property bool isPicked: false

                 x: 200
                 z: 100

                 scale.x: 2
                 scale.y: 1.5
                 scale.z: 2

                 materials: DefaultMaterial {
                     diffuseColor: coneModel.isPicked ? "#21be2b" : "#53586b"
                     specularAmount: 1
                     specularRoughness: 0.1
                     roughnessMap: Texture { source: "maps/roughness.jpg" }
                 }

                 SequentialAnimation on eulerRotation {
                     running: !coneModel.isPicked
                     loops: Animation.Infinite
                     PropertyAnimation {
                         duration: 10000
                         from: Qt.vector3d(0, 0, 0)
                         to: Qt.vector3d(-360, 360, 0)
                     }
                 }
             }

             Model {
                 id: sphereModel
                 objectName: "Sphere"
                 source: "#Sphere"
                 pickable: true
                 property bool isPicked: false

                 x: -100
                 y: -100
                 z: -100

                 scale.x: 5
                 scale.y: 3
                 scale.z: 1

                 materials: DefaultMaterial {
                     diffuseColor: sphereModel.isPicked ? "#17a81a" : "#9d9faa"
                     specularAmount: 0.25
                     specularRoughness: 0.2
                     roughnessMap: Texture { source: "maps/roughness.jpg" }
                 }

                 SequentialAnimation on eulerRotation.x {
                     running: !sphereModel.isPicked
                     loops: Animation.Infinite
                     PropertyAnimation {
                         duration: 5000
                         from: 0
                         to: 360
                     }
                 }
             }
         }

         MouseArea {
             anchors.fill: view

             onClicked: (mouse) => {
                 // Get screen coordinates of the click
                 pickPosition.text = "(" + mouse.x + ", " + mouse.y + ")"
                 var result = view.pick(mouse.x, mouse.y);
                 if (result.objectHit) {
                     var pickedObject = result.objectHit;
                     // Toggle the isPicked property for the model
                     pickedObject.isPicked = !pickedObject.isPicked;
                     // Get picked model name
                     pickName.text = pickedObject.objectName;
                     // Get other pick specifics
                     uvPosition.text = "("
                             + result.uvPosition.x.toFixed(2) + ", "
                             + result.uvPosition.y.toFixed(2) + ")";
                     distance.text = result.distance.toFixed(2);
                     scenePosition.text = "("
                             + result.scenePosition.x.toFixed(2) + ", "
                             + result.scenePosition.y.toFixed(2) + ", "
                             + result.scenePosition.z.toFixed(2) + ")";
                     localPosition.text = "("
                             + result.position.x.toFixed(2) + ", "
                             + result.position.y.toFixed(2) + ", "
                             + result.position.z.toFixed(2) + ")";
                     worldNormal.text = "("
                             + result.sceneNormal.x.toFixed(2) + ", "
                             + result.sceneNormal.y.toFixed(2) + ", "
                             + result.sceneNormal.z.toFixed(2) + ")";
                     localNormal.text = "("
                             + result.normal.x.toFixed(2) + ", "
                             + result.normal.y.toFixed(2) + ", "
                             + result.normal.z.toFixed(2) + ")";
                 } else {
                     pickName.text = "None";
                     uvPosition.text = "";
                     distance.text = "";
                     scenePosition.text = "";
                     localPosition.text = "";
                     worldNormal.text = "";
                     localNormal.text = "";
                 }
             }
         }
     }