Qt Quick 3D - Dynamic Model Creation Example | Qt Quick 3D 5.14.2

Qt 5.14 | Qt Quick 3D | Qt Quick 3D - Dynamic Model Creation Example

Qt 5.14.2 Reference Documentation

# 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);
              }
          }
      }