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Qt 3D: Simple QML Example

Simple demonstrates how to render a scene in Qt 3D.

Running the Example

To run the example from Qt Creator, open the Welcome mode and select the example from Examples. For more information, visit Building and Running an Example.

Setting Up the Scene

We set up the entire scene in the main.qml file.

To be able to use the types in the Q3D and Q3D Render modules, we must import the modules:

import Qt3D.Core 2.0
import Qt3D.Render 2.0

The first entities we create are a Camera, which represents the camera used for the final rendering, and a camera controller, which allows us to control this camera using the keyboard or the mouse:

    Camera {
        id: camera
        projectionType: CameraLens.PerspectiveProjection
        fieldOfView: 45
        aspectRatio: 16/9
        nearPlane : 0.1
        farPlane : 1000.0
        position: Qt.vector3d( 0.0, 0.0, -40.0 )
        upVector: Qt.vector3d( 0.0, 1.0, 0.0 )
        viewCenter: Qt.vector3d( 0.0, 0.0, 0.0 )
    }

    OrbitCameraController {
        camera: camera
    }

A RenderSettings entity specifies a ForwardRenderer as the active framegraph:

    components: [
        RenderSettings {
            activeFrameGraph: ForwardRenderer {
                clearColor: Qt.rgba(0, 0.5, 1, 1)
                camera: camera
            }
        },

The event source is set by the Qt3DQuickWindow:

        InputSettings { }

Specifying Settings and Axes

In the CameraController.qml file, we use the LogicalDevice type to define a set of actions and axes to use within the application:

    LogicalDevice {
        id: cameraControlDevice

        actions: [
            Action {
                name: "LMB"
                inputs: [
                    ActionInput {
                        sourceDevice: mouseSourceDevice
                        buttons: [MouseEvent.LeftButton]
    ...
        axes: [
            // Rotation
            Axis {
                name: "RX"
                inputs: [
                    AnalogAxisInput {
                        sourceDevice: mouseSourceDevice
                        axis: MouseDevice.X
                    }
                ]
    ...

Files:

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