- Qt 5.15
- 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

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     import QtQuick 2.15
     import QtQuick.Window 2.14
     import QtQuick.Controls 2.14
     import QtQuick3D 1.15

     Window {
         visible: true
         width: 1280
         height: 720
         title: qsTr("Picking Example")

         Row {
             anchors.top: parent.top
             anchors.horizontalCenter: parent.horizontalCenter
             spacing: 20
             Label {
                 id: pickName
                 color: "#222840"
                 font.pointSize: 14
                 text: "Last Pick: None"
             }
             Label {
                 id: pickPosition
                 color: "#222840"
                 font.pointSize: 14
                 text: "Screen Position: (0, 0)"
             }
             Label {
                 id: uvPosition
                 color: "#222840"
                 font.pointSize: 14
                 text: "UV Position: (0.00, 0.00)"
             }
             Label {
                 id: distance
                 color: "#222840"
                 font.pointSize: 14
                 text: "Distance: 0.00"
             }
             Label {
                 id: scenePosition
                 color: "#222840"
                 font.pointSize: 14
                 text: "World Position: (0.00, 0.00)"
             }
         }

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

             PointLight {
                 x: -200
                 y: 200
                 z: 300
                 quadraticFade: 0
                 brightness: 150
             }

             PerspectiveCamera {
                 z: 500
             }

             environment: SceneEnvironment {
                 clearColor: "#848895"
                 backgroundMode: SceneEnvironment.Color
             }

             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 ? "#53586b" : "#21be2b"
                     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: {
                 // Get screen coordinates of the click
                 pickPosition.text = "Screen Position: (" + 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 = "Last Pick: " + pickedObject.objectName;
                     // Get other pick specifics
                     uvPosition.text = "UV Position: ("
                             + result.uvPosition.x.toFixed(2) + ", "
                             + result.uvPosition.y.toFixed(2) + ")";
                     distance.text = "Distance: " + result.distance.toFixed(2);
                     scenePosition.text = "World Position: ("
                             + result.scenePosition.x.toFixed(2) + ", "
                             + result.scenePosition.y.toFixed(2) + ")";
                 } else {
                     pickName.text = "Last Pick: None";
                 }
             }
         }
     }