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Я рад, что ошибка с загрузкой файлов COLLADA DAE была исправлена в Qt 6. Но у меня странная проблема: модель COLLADA DAE темнее, чем OBJ.

Я создал этот куб в блендере 2.93:

С OBJ это прекрасно работает:

Но когда я экспортирую в DAE, я вижу, что модель темнее:

This is my .pro file:

 QT  = 3dcore 3dlogic 3dextras 3dinput  

This is the main.cpp file:

 #ifdef _WIN32 #include lt;windows.hgt; extern "C" __declspec(dllexport) DWORD NvOptimusEnablement = 0x00000001; extern "C" __declspec(dllexport) DWORD AmdPowerXpressRequestHighPerformance = 0x00000001; #endif  #include lt;QtCore/QDebuggt; #include lt;QtGui/QGuiApplicationgt; #include lt;Qt3DExtras/Qt3DWindowgt; #include lt;Qt3DExtras/QCuboidMeshgt; #include lt;Qt3DExtras/QPhongMaterialgt; #include lt;Qt3DExtras/QOrbitCameraControllergt; #include lt;Qt3DCore/QEntitygt; #include lt;Qt3DCore/QTransformgt; #include lt;Qt3DRender/QCameragt; #include lt;Qt3DRender/QPointLightgt; #include lt;Qt3DRender/QSceneLoadergt;  class Window : public Qt3DExtras::Qt3DWindow { public:  Window()  {  setTitle("COLLADA DAE 3D model");  resize(400, 400);   Qt3DCore::QEntity *rootEntity = new Qt3DCore::QEntity();   // Lighting  Qt3DCore::QEntity *lightEntity = new Qt3DCore::QEntity(rootEntity);  Qt3DRender::QPointLight *pointLight = new Qt3DRender::QPointLight(lightEntity);  Qt3DCore::QTransform *lightTransform = new Qt3DCore::QTransform(lightEntity);  lightTransform-gt;setTranslation(QVector3D(20.f, 25.f, 30.f));  lightEntity-gt;addComponent(pointLight);  lightEntity-gt;addComponent(lightTransform);   // 3D Model  Qt3DCore::QEntity *objectEntity = new Qt3DCore::QEntity(rootEntity);  Qt3DRender::QSceneLoader *sceneLoader = new Qt3DRender::QSceneLoader(objectEntity); // sceneLoader-gt;setSource(QUrl("qrc:/Models/Cube.obj"));  sceneLoader-gt;setSource(QUrl("qrc:/Models/Cube.dae"));  objectEntity-gt;addComponent(sceneLoader);  Qt3DCore::QTransform *objectTransform = new Qt3DCore::QTransform(objectEntity);  objectTransform-gt;setScale(10.f);  objectEntity-gt;addComponent(objectTransform);   // Camera  Qt3DRender::QCamera *camera = this-gt;camera();  camera-gt;lens()-gt;setPerspectiveProjection(  60.f, (float) this-gt;width() / this-gt;height(), 0.1f, 500.0f);  camera-gt;setPosition(QVector3D(30.0f, 30.0f, 30.f));  camera-gt;setViewCenter(QVector3D(0.f, 0.f, 0.f));   Qt3DExtras::QOrbitCameraController *cameraController =  new Qt3DExtras::QOrbitCameraController(rootEntity);  cameraController-gt;setCamera(camera);  cameraController-gt;setLookSpeed(180.f);  cameraController-gt;setLinearSpeed(50.f);   this-gt;setRootEntity(rootEntity);  } };  int main(int argc, char *argv[]) {  QGuiApplication app(argc, argv);   Window w;  w.show();   return app.exec(); }  

This is a model of Cube:

Cube.dae

 lt;?xml version="1.0" encoding="utf-8"?gt; lt;COLLADA xmlns="http://www.collada.org/2005/11/COLLADASchema" version="1.4.1"gt;  lt;assetgt;  lt;contributorgt;  lt;authorgt;Blender Userlt;/authorgt;  lt;authoring_toolgt;Blender 2.76.0 commit date:2015-10-11, commit time:06:55, hash:48f7dd6lt;/authoring_toolgt;  lt;/contributorgt;  lt;createdgt;2020-12-10T01:55:11lt;/createdgt;  lt;modifiedgt;2020-12-10T01:55:11lt;/modifiedgt;  lt;unit name="meter" meter="1"/gt;  lt;up_axisgt;Z_UPlt;/up_axisgt;  lt;/assetgt;  lt;library_images/gt;  lt;library_effectsgt;  lt;effect id="BackgoundMaterial-effect"gt;  lt;profile_COMMONgt;  lt;technique sid="common"gt;  lt;phonggt;  lt;emissiongt;  lt;color sid="emission"gt;0 0 0 1lt;/colorgt;  lt;/emissiongt;  lt;ambientgt;  lt;color sid="ambient"gt;0 0 0 1lt;/colorgt;  lt;/ambientgt;  lt;diffusegt;  lt;color sid="diffuse"gt;0.07052612 0.64 0.02013014 1lt;/colorgt;  lt;/diffusegt;  lt;speculargt;  lt;color sid="specular"gt;0.5 0.5 0.5 1lt;/colorgt;  lt;/speculargt;  lt;shininessgt;  lt;float sid="shininess"gt;50lt;/floatgt;  lt;/shininessgt;  lt;index_of_refractiongt;  lt;float sid="index_of_refraction"gt;1lt;/floatgt;  lt;/index_of_refractiongt;  lt;/phonggt;  lt;/techniquegt;  lt;/profile_COMMONgt;  lt;/effectgt;  lt;effect id="SideMaterial-effect"gt;  lt;profile_COMMONgt;  lt;technique sid="common"gt;  lt;phonggt;  lt;emissiongt;  lt;color sid="emission"gt;0 0 0 1lt;/colorgt;  lt;/emissiongt;  lt;ambientgt;  lt;color sid="ambient"gt;0 0 0 1lt;/colorgt;  lt;/ambientgt;  lt;diffusegt;  lt;color sid="diffuse"gt;0.64 0.06314375 0.129652 1lt;/colorgt;  lt;/diffusegt;  lt;speculargt;  lt;color sid="specular"gt;0.5 0.5 0.5 1lt;/colorgt;  lt;/speculargt;  lt;shininessgt;  lt;float sid="shininess"gt;50lt;/floatgt;  lt;/shininessgt;  lt;index_of_refractiongt;  lt;float sid="index_of_refraction"gt;1lt;/floatgt;  lt;/index_of_refractiongt;  lt;/phonggt;  lt;/techniquegt;  lt;/profile_COMMONgt;  lt;/effectgt;  lt;/library_effectsgt;  lt;library_materialsgt;  lt;material id="BackgoundMaterial-material" name="BackgoundMaterial"gt;  lt;instance_effect url="#BackgoundMaterial-effect"/gt;  lt;/materialgt;  lt;material id="SideMaterial-material" name="SideMaterial"gt;  lt;instance_effect url="#SideMaterial-effect"/gt;  lt;/materialgt;  lt;/library_materialsgt;  lt;library_geometriesgt;  lt;geometry id="Cube-mesh" name="Cube"gt;  lt;meshgt;  lt;source id="Cube-mesh-positions"gt;  lt;float_array id="Cube-mesh-positions-array" count="24"gt;1 1 -1 1 -1 -1 -1 -0.9999998 -1 -0.9999997 1 -1 1 0.9999995 1 0.9999994 -1.000001 1 -1 -0.9999997 1 -1 1 1lt;/float_arraygt;  lt;technique_commongt;  lt;accessor source="#Cube-mesh-positions-array" count="8" stride="3"gt;  lt;param name="X" type="float"/gt;  lt;param name="Y" type="float"/gt;  lt;param name="Z" type="float"/gt;  lt;/accessorgt;  lt;/technique_commongt;  lt;/sourcegt;  lt;source id="Cube-mesh-normals"gt;  lt;float_array id="Cube-mesh-normals-array" count="36"gt;0 0 -1 0 0 1 1 -5.96046e-7 3.27825e-7 -4.76837e-7 -1 0 -1 2.38419e-7 -1.19209e-7 2.08616e-7 1 0 0 0 -1 0 0 1 1 0 -2.38419e-7 0 -1 -4.76837e-7 -1 2.38419e-7 -1.49012e-7 2.68221e-7 1 2.38419e-7lt;/float_arraygt;  lt;technique_commongt;  lt;accessor source="#Cube-mesh-normals-array" count="12" stride="3"gt;  lt;param name="X" type="float"/gt;  lt;param name="Y" type="float"/gt;  lt;param name="Z" type="float"/gt;  lt;/accessorgt;  lt;/technique_commongt;  lt;/sourcegt;  lt;vertices id="Cube-mesh-vertices"gt;  lt;input semantic="POSITION" source="#Cube-mesh-positions"/gt;  lt;/verticesgt;  lt;polylist material="BackgoundMaterial-material" count="10"gt;  lt;input semantic="VERTEX" source="#Cube-mesh-vertices" offset="0"/gt;  lt;input semantic="NORMAL" source="#Cube-mesh-normals" offset="1"/gt;  lt;vcountgt;3 3 3 3 3 3 3 3 3 3 lt;/vcountgt;  lt;pgt;0 0 1 0 2 0 7 1 6 1 5 1 5 3 6 3 2 3 2 4 6 4 7 4 0 5 3 5 7 5 3 6 0 6 2 6 4 7 7 7 5 7 1 9 5 9 2 9 3 10 2 10 7 10 4 11 0 11 7 11lt;/pgt;  lt;/polylistgt;  lt;polylist material="SideMaterial-material" count="2"gt;  lt;input semantic="VERTEX" source="#Cube-mesh-vertices" offset="0"/gt;  lt;input semantic="NORMAL" source="#Cube-mesh-normals" offset="1"/gt;  lt;vcountgt;3 3 lt;/vcountgt;  lt;pgt;4 2 5 2 1 2 0 8 4 8 1 8lt;/pgt;  lt;/polylistgt;  lt;/meshgt;  lt;/geometrygt;  lt;/library_geometriesgt;  lt;library_controllers/gt;  lt;library_visual_scenesgt;  lt;visual_scene id="Scene" name="Scene"gt;  lt;node id="Cube" name="Cube" type="NODE"gt;  lt;matrix sid="transform"gt;1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1lt;/matrixgt;  lt;instance_geometry url="#Cube-mesh" name="Cube"gt;  lt;bind_materialgt;  lt;technique_commongt;  lt;instance_material symbol="BackgoundMaterial-material" target="#BackgoundMaterial-material"/gt;  lt;instance_material symbol="SideMaterial-material" target="#SideMaterial-material"/gt;  lt;/technique_commongt;  lt;/bind_materialgt;  lt;/instance_geometrygt;  lt;/nodegt;  lt;/visual_scenegt;  lt;/library_visual_scenesgt;  lt;scenegt;  lt;instance_visual_scene url="#Scene"/gt;  lt;/scenegt; lt;/COLLADAgt;  

Cube.obj

 # Blender v2.93.5 OBJ File: '' # www.blender.org mtllib Cube.mtl o Cube_Cube.001 v 1.000000 -1.000000 -1.000000 v 1.000000 -1.000000 1.000000 v -1.000000 -1.000000 1.000000 v -1.000000 -1.000000 -1.000000 v 1.000000 1.000000 -1.000000 v 0.999999 1.000000 1.000001 v -1.000000 1.000000 1.000000 v -1.000000 1.000000 -1.000000 vn 0.0000 -1.0000 0.0000 vn 0.0000 1.0000 0.0000 vn -0.0000 0.0000 1.0000 vn -1.0000 -0.0000 0.0000 vn 0.0000 0.0000 -1.0000 vn 1.0000 0.0000 0.0000 usemtl BackgoundMaterial s off f 1//1 2//1 3//1 f 8//2 7//2 6//2 f 6//3 7//3 3//3 f 3//4 7//4 8//4 f 1//5 4//5 8//5 f 4//1 1//1 3//1 f 5//2 8//2 6//2 f 2//3 6//3 3//3 f 4//4 3//4 8//4 f 5//5 1//5 8//5 usemtl SideMaterial f 5//6 6//6 2//6 f 1//6 5//6 2//6  

Cube.mtl

 # Blender MTL File: 'None' # Material Count: 2  newmtl BackgoundMaterial Ns 225.000000 Ka 1.000000 1.000000 1.000000 Kd 0.070526 0.640000 0.020130 Ks 0.500000 0.500000 0.500000 Ke 0.000000 0.000000 0.000000 Ni 1.000000 d 1.000000 illum 2  newmtl SideMaterial Ns 225.000000 Ka 1.000000 1.000000 1.000000 Kd 0.640000 0.063144 0.129652 Ks 0.500000 0.500000 0.500000 Ke 0.000000 0.000000 0.000000 Ni 1.000000 d 1.000000 illum 2