Importing a mesh (obj) file

[Dimis]

Hi all,

I'm trying to load an *.obj file. My code is this:

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();

Qt3DCore::QEntity *rootEntity = new Qt3DCore::QEntity();

Qt3DRender::QMesh *mesh = new Qt3DRender::QMesh();
    mesh->setSource(QUrl(QStringLiteral("qrc:/LabPart.obj")));



    Qt3DCore::QEntity *object = new Qt3DCore::QEntity(rootEntity);
    object->addComponent(mesh);


return a.exec();

}

It doesn't return any error but it doesn't display the model, just a blank window.

Any help please?

Many thanks in advance.

[ofmrew]

@Dimis I had a similar problem with a PLY file and it was the definition of the QUrl. You might want to check the QUrl to see if the file exist. I did not create the QUrl correctly. Try

QUrl data = QUrl::fromLocalFile("/home/XXX/flyingwedge.ply");
qDebug() << data.isValid() << data.toLocalFile() << QFileInfo(data.toLocalFile()).exists() << data.fileName();

If the QUrl is incorrect you get no error message.

[Dimis]

@ofmrew I added these lines. it returned true. the path of file and that it exists, but still it doesn't display the model.

I feel that something is missing. Any other suggestions?

[ofmrew]

@Dimis Have you tried to import the file into MeshLab or Blender. I do not see where you set the root entity you created it but never set it in the view.

Here is some code you can modify.

int main(int argc, char *argv[])
{
QGuiApplication a(argc, argv);
QUrl data = your code here.

Qt3DExtras::Qt3DWindow view;
Qt3DCore::QEntity *rootEntity = new Qt3DCore::QEntity;
Qt3DCore::QEntity *flyingwedge = new Qt3DCore::QEntity(rootEntity);

Qt3DExtras::QPhongMaterial *material = new Qt3DExtras::QPhongMaterial();
material->setDiffuse(QColor(QRgb(0xbeb32b)));

Qt3DRender::QMesh *flyingwedgeMesh = new Qt3DRender::QMesh;
flyingwedgeMesh->setMeshName("FlyingWedge");
flyingwedgeMesh->setSource(data);
Qt3DCore::QTransform *flyingwedgeTransform = new Qt3DCore::QTransform;
flyingwedgeTransform->setScale3D(QVector3D(1.0, 1.0, 1.0));
Qt3DRender::QFrontFace *frontFace = new Qt3DRender::QFrontFace(rootEntity);
frontFace->setDirection(Qt3DRender::QFrontFace::CounterClockWise);
flyingwedge->addComponent(flyingwedgeMesh);
flyingwedge->addComponent(material);
flyingwedge->addComponent(flyingwedgeTransform);
Qt3DRender::QCamera *camera = view.camera();
camera->lens()->setPerspectiveProjection(45.0f, 16.0f/9.0f, 0.1f, 1000.0f);
camera->setPosition(QVector3D(0, 0, 40.0f));
camera->setViewCenter(QVector3D(0, 0, 0));

Qt3DCore::QEntity *lightEntity = new Qt3DCore::QEntity(rootEntity);
Qt3DRender::QPointLight *light = new Qt3DRender::QPointLight(lightEntity);
light->setColor("white");
light->setIntensity(0.5);
lightEntity->addComponent(light);
Qt3DCore::QTransform *lightTransform = new Qt3DCore::QTransform(lightEntity);
lightTransform->setTranslation(QVector3D(60, 0, 40.0f));
lightEntity->addComponent(lightTransform);

view.setRootEntity(rootEntity);
view.show();
return a.exec();

}

[Dimis]

@ofmrew Thanks very much, it worked. Also it works for STL files.

[aha_1980]

@Dimis Then please mark this thread as solved.

Thanks.