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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95

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                     }                 ]             }         }     } }

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！