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Qt 3D Qt3DExtras::Qt3DWindow::show() is slow.



  • I m using Qt 3D to visualise point cloud data. I have modified the example given here: simple-cpp example.
    I have added the code to read a file containing 99477 points. Following code snippet shows how I m filling the Entity class with point cloud data.

    for (int i = 0; i < X.size(); i++)
       {
           Qt3DCore::QEntity *sphereEntity = new Qt3DCore::QEntity(rootEntity);
           Qt3DExtras::QSphereMesh *sphereMesh = new Qt3DExtras::QSphereMesh;
           sphereMesh->setRadius(0.05);
    
           Qt3DCore::QTransform *sphereTransform = new Qt3DCore::QTransform;
    
           sphereTransform->setTranslation(QVector3D(X[i], Y[i], Z[i]));
           sphereEntity->addComponent(sphereMesh);
           sphereEntity->addComponent(sphereTransform);
           sphereEntity->addComponent(material);
       }
    

    The code is crashed after Qt3DExtras::Qt3DWindow::show() is called. The terminal output is as below:

    17:53:33: Starting /home/suraj/Qt/Examples/Qt-5.15.2/qt3d/build-simple-cpp-Desktop_Qt_5_15_2_GCC_64bit-Release/simple-cpp ...
    Point cloud size: 99477 points.
    18:00:06: The program has unexpectedly finished.
    18:00:06: The process was ended forcefully.
    18:00:06: /home/suraj/Qt/Examples/Qt-5.15.2/qt3d/build-simple-cpp-Desktop_Qt_5_15_2_GCC_64bit-Release/simple-cpp crashed.
    

    So I decreased the number of points to ~18000, then it is able to load the scene but with some delay in seconds.

    Can anyone guide me on this?


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