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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import QtQuick.Controls 2.2 import QtQuick.Dialogs 1.2 import QtQuick.Scene3D 2.0 import Qt3D.Core 2.0 import Qt3D.Render 2.0 import Qt3D.Input 2.0 import Qt3D.Extras 2.0 ApplicationWindow {     visible: true      640     height: 480     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: 30                 aspectRatio: 16/9                 nearPlane : 0.1                 farPlane : 1000.0                 position: Qt.vector3d( 10.0, 0.0, 100.0 )                 upVector: Qt.vector3d( 0.0, 1.0, 0.0 )                 viewCenter: Qt.vector3d( 0.0, 0.0, 0.0 )             }                          OrbitCameraController             {                 camera: camera             }                          components: [                 RenderSettings                 {                     activeFrameGraph: ForwardRenderer                     {                         clearColor: Qt.rgba(0, 0.5, 1, 1)                         camera: camera                     }                 },                 InputSettings                 {                 }             ]                          Entity             {                 id: monkeyEntity                 components: [                     SceneLoader                     {                         id: sceneLoader                     }                 ]             }         }     } }

例子比较简单，主要使用了SceneLoader来加载3D模型文件，只能实现3D模型文件简单的加载，以及鼠标滚轮缩放等，更详细的操控可在InputSettings中完善！