QT QML 3D模型查看器

原文链接：http://amin-ahmadi.com/2018/01/28/viewing-3d-models-using-qt/

本文使用QT Quick中的Scene3D QML类型来查看3D模型文件，QT 3D使用assimp库来加载，支持如下3D文件格式：

3D, 3DS, 3MF, AC, AC3D, ACC, AMJ, ASE, ASK, B3D, BLEND (Blender), BVH, COB, CMS, DAE/Collada, DXF, ENFF, FBX, glTF 1.0 + GLB, glTF 2.0, HMB, IFC-STEP, IRR / IRRMESH, LWO, LWS, LXO, MD2, MD3, MD5, MDC, MDL, MESH / MESH.XML, MOT, MS3D, NDO, NFF, OBJ, OFF, OGEX, PLY, PMX, PRJ, Q3O, Q3S, RAW, SCN, SIB, SMD, STL, STP, TER, UC, VTA, X, X3D, XGL, ZGL等

我使用QT5.12+Qt Creator4.8.0测试，效果图如下：

QML文件将包含ApplicationWindow，其中ToolBar（包含ToolButton）使用FileDialog打开3D模型文件，Scene3D将包含加载的模型：

main.qml

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ApplicationWindow
{
    visible: true
    width:
    height:
    title: qsTr(“3D Viewer”)

    header: ToolBar
    {
        ToolButton
        {
            text: “Open 3D Model”
            onPressed:
            {
                fileDialog.open()
            }
        }
    }

    FileDialog
    {
        id: fileDialog
        onAccepted:
        {
            sceneLoader.source = fileDialog.fileUrl
        }
    }

    Scene3D
    {
        anchors.fill: parent

        aspects: [“input”, “logic”]
        cameraAspectRatioMode: Scene3D.AutomaticAspectRatio

        Entity
        {
            id: sceneRoot

            Camera
            {
                id: camera
                projectionType: CameraLens.PerspectiveProjection
                fieldOfView:
                aspectRatio:
                nearPlane :
                farPlane :
                position: Qt.vector3d(  )
                upVector: Qt.vector3d(  )
                viewCenter: Qt.vector3d(  )
            }

            OrbitCameraController
            {
                camera: camera
            }

            components: [
                RenderSettings
                {
                    activeFrameGraph: ForwardRenderer
                    {
                        clearColor: Qt.rgba()
                        camera: camera
                    }
                },
                InputSettings
                {
                }
            ]

            Entity
            {
                id: monkeyEntity
                components: [
                    SceneLoader
                    {
                        id: sceneLoader
                    }
                ]
            }
        }
    }
}