Qt Quick 3D - View3D Example | Qt Quick 3D 5.14.2

Qt 5.14 | Qt Quick 3D | Qt Quick 3D - View3D Example

Qt 5.14.2 Reference Documentation

# Qt Quick 3D - View3D Example

Demonstrates the use of View3D to show a scene from multiple cameras.

This example demonstrates using four separate View3Ds with different cameras in an application.

#### Defining the Cameras

First we define the cameras. We're going to define several different cameras, even though we will only add 4 views. We're doing this because we want to be able to switch the camera in one of the views.

The cameras have to be defined inside the root Node. This is how the cameras are defined:

      Node {
          id: standAloneScene
          ...
      // The predefined cameras. They have to be part of the scene, i.e. inside the root node.
      // Animated perspective camera
      Node {
          PerspectiveCamera {
              id: cameraPerspectiveOne
              z: -600
          }
          PropertyAnimation on rotation {
              loops: Animation.Infinite
              duration: 5000
              to: Qt.vector3d(360, 0, 0)
              from: Qt.vector3d(0, 0, 0)
          }
      }

      // Stationary perspective camera
      PerspectiveCamera {
          id: cameraPerspectiveTwo
          z: -600
      }
          ...
      // Stationary orthographic camera viewing from left
      OrthographicCamera {
          id: cameraOrthographicLeft
          x: -600
          rotation: Qt.vector3d(0, 90, 0)
      }
      }

#### Adding the Views

After defining the cameras we can add the views. We divide the screen to four parts, and add views one-by-one like this:

      // The views
      Rectangle {
          id: topLeft
          anchors.top: parent.top
          anchors.left: parent.left
          width: parent.width * 0.5
          height: parent.height * 0.5
          color: "#848895"
          border.color: "black"

          View3D {
              id: topLeftView
              anchors.fill: parent
              importScene: standAloneScene
              camera: cameraOrthographicFront
          }

          Label {
              text: "Front"
              anchors.top: parent.top
              anchors.left: parent.left
              anchors.margins: 10
              color: "#222840"
              font.pointSize: 14
          }
      }
          ...

The top-right view has three buttons in it. The buttons can be used to switch the camera used in that view on the fly. The switching is done just by settings the camera property:

      RoundButton {
          text: "Camera 1"
          highlighted: topRightView.camera == cameraPerspectiveOne
          onClicked: {
              topRightView.camera = cameraPerspectiveOne
          }
      }
          ...

Files:

- view3d/main.cpp
- view3d/main.qml
- view3d/qml.qrc
- view3d/view3d.pro