- Qt 5.15
- Qt Quick 3D
- Qt Quick 3D Examples and Tutorials
- Qt Quick 3D - View3D Example
- Qt Quick 3D | Commercial or GPLv3

# 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 eulerRotation.x {
             loops: Animation.Infinite
             duration: 5000
             to: -360
             from: 0
         }
     }

     // Stationary perspective camera
     PerspectiveCamera {
         id: cameraPerspectiveTwo
         z: 600
     }
         ...
     // Stationary orthographic camera viewing from left
     OrthographicCamera {
         id: cameraOrthographicLeft
         x: -600
         eulerRotation.y: -90
     }
     }

#### 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