Qt Quick 3D - Dynamic Model Creation Example


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  import QtQuick 2.14
  import QtQuick.Window 2.14
  import QtQuick.Controls 2.14
  import QtQuick3D 1.14

  Window {
      id: window
      width: 1280
      height: 720
      visible: true
      title: "Dynamic Model Creation example"

      Button {
          id: addButton
          anchors.left: parent.left
          anchors.top: parent.top
          anchors.margins: 20
          text: "Add Model"
          implicitWidth: 150

          background: Rectangle {
              implicitWidth: 150
              implicitHeight: 40
              opacity: enabled ? 1 : 0.3
              color: parent.down ? "#6b7080" : "#848895"
              border.color: "#222840"
              border.width: 1
              radius: 5
          }

          onClicked: {
              if (shapeSpawner.instances.length < shapeSpawner.maxInstances)
                  shapeSpawner.addOrRemove(true);
          }
      }

      Label {
          id: countLabel
          anchors.top: parent.top
          anchors.horizontalCenter: parent.horizontalCenter
          anchors.margins: 20
          font.pointSize: 20
          font.bold: true
          color: "#848895"
      }

      Button {
          id: removeButton
          anchors.right: parent.right
          anchors.top: parent.top
          anchors.margins: 20
          text: "Remove Model"
          implicitWidth: 150

          background: Rectangle {
              implicitWidth: 150
              implicitHeight: 40
              opacity: enabled ? 1 : 0.3
              color: parent.down ? "#6b7080" : "#848895"
              border.color: "#222840"
              border.width: 1
              radius: 5
          }

          onClicked: {
              if (shapeSpawner.instances.length > 0)
                  shapeSpawner.addOrRemove(false);
          }
      }

      View3D {
          anchors.fill: parent
          camera: camera
          renderMode: View3D.Underlay

          environment: SceneEnvironment {
              clearColor: "black"
              backgroundMode: SceneEnvironment.Color
              multisampleAAMode: SceneEnvironment.X4
          }

          PointLight {
              position: Qt.vector3d(0, 0, 0);
              brightness: 1500
          }

          Node {
              position: Qt.vector3d(0, 0, 0);

              PerspectiveCamera {
                  position: Qt.vector3d(0, 0, -600)
              }

              rotation: Qt.vector3d(0, 90, 0)

              SequentialAnimation on rotation {
                  loops: Animation.Infinite
                  PropertyAnimation {
                      duration: 5000
                      to: Qt.vector3d(0, 360, 0)
                      from: Qt.vector3d(0, 0, 0)
                  }
              }
          }

          Node {
              id: shapeSpawner
              property real range: 300
              property var instances: []
              readonly property int maxInstances: 100

              function addOrRemove(add) {
                  if (add) {
                      // Create a new weirdShape at random postion
                      var xPos = (2 * Math.random() * range) - range;
                      var yPos = (2 * Math.random() * range) - range;
                      var zPos = (2 * Math.random() * range) - range;
                      var weirdShapeComponent = Qt.createComponent("WeirdShape.qml");
                      let instance = weirdShapeComponent.createObject(
                              shapeSpawner, { "x": xPos, "y": yPos, "z": zPos,
                                  "scale": Qt.vector3d(0.25, 0.25, 0.25)});
                      instances.push(instance);
                      if (instances.length === maxInstances)
                          addButton.enabled = false;
                      else if (instances.length > 0)
                          removeButton.enabled = true;
                  } else {
                      // Remove last item in instances list
                      let instance = instances.pop();
                      instance.destroy();
                      if (instances.length === 0)
                          removeButton.enabled = false;
                      else if (instances.length < maxInstances)
                          addButton.enabled = true;
                  }
                  countLabel.text = "Models in Scene: " + instances.length;
              }
          }

          Component.onCompleted: {
              // Create 10 instances to get started
              for (var i = 0; i < 10; ++i)
                  shapeSpawner.addOrRemove(true);
          }
      }
  }