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
    implicitWidth: controlsContainer.buttonWidth
    onClicked: {
        topRightView.camera = cameraPerspectiveOne
    }
}
    ...

Example project @ code.qt.io

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