Qt Creator shows nothing for my first 3D project!

sierdzio

I'm on Linux but I tried it on a Windows 10 virtual machine (my GPU is nVidia but the VM has an emulated GPU), it compiles, runs and I can see the 3D bar chart. No crashes, no problems show up. I've tried it with Qt 6.4.3.

qcoderpro

@sierdzio

Thanks so much.
My Qt version seems to be the same yours

I will be very thankful if you zip that project and share it on some file sharing website (anyone you like) and I will download and scrutinize it, hopefully to know the reason why I get that problem.
Thanks in advance.

sierdzio

OK so that again points in the direction of OpenGL drivers... but the ones from nVidia are very stable, it would be very unusual for them to cause a crash.

qcoderpro

@sierdzio

Do you also create a project for that example this way?
New Project > Qt Quick Application -> CMake -> Qt 6.4 -> next -> finish
and then without modifying main.cpp or CMakeLists.txt I paste the content of that example into main.qml file:

import QtQuick
import QtDataVisualization

Item {
    width: 640
    height: 480

    Rectangle {
        x: 100; y: 100
        width: 200; height: 200
        color: "blue"
    }

    Bars3D {
        width: parent.width
        height: parent.height

        Bar3DSeries {
            itemLabelFormat: "@colLabel, @rowLabel: @valueLabel"

            ItemModelBarDataProxy {
                itemModel: dataModel
                // Mapping model roles to bar series rows, columns, and values.
                rowRole: "year"
                columnRole: "city"
                valueRole: "expenses"
            }
        }
    }

    ListModel {
        id: dataModel
        ListElement{ year: "2012"; city: "Oulu";     expenses: "4200"; }
        ListElement{ year: "2012"; city: "Rauma";    expenses: "2100"; }
        ListElement{ year: "2012"; city: "Helsinki"; expenses: "7040"; }
        ListElement{ year: "2012"; city: "Tampere";  expenses: "4330"; }
        ListElement{ year: "2013"; city: "Oulu";     expenses: "3960"; }
        ListElement{ year: "2013"; city: "Rauma";    expenses: "1990"; }
        ListElement{ year: "2013"; city: "Helsinki"; expenses: "7230"; }
        ListElement{ year: "2013"; city: "Tampere";  expenses: "4650"; }
    }
}

When I run this, Qt Creator shows nothing but in the Application Output I get the message: ninja: no work to do.

sierdzio

@qcoderpro said in Qt Creator shows nothing for my first 3D project!:

Do you also create a project for that example this way?
New Project > Qt Quick Application -> CMake -> Qt 6.4 -> next -> finish

No. I open the example through Examples section in Qt Creator, then configure it and run.

Welcome -> Examples -> search for that example -> Configure -> Build & Run

qcoderpro

@sierdzio
That's a difference.
That example doesn't exists in the Examples section! If you point to the simple bar graph one, yes, it works well for me too. But I need to somehow run the simple example mentioned here for part of my other project.

Let's focus on that simple example. How do run it in a project? Please write the steps and I also do the same and then we compare our outputs. I'm sure that way we can be sure if there's a problem with my graphic card or not.

sierdzio

OK when I do it your way I get a crash, too.

sierdzio

... and the crash is gone when I add this line as first in main():

qputenv("QSG_RHI_BACKEND", "opengl");

qcoderpro

@sierdzio
Even if I add that line in main.cpp the result is the same: ninja: no work to do!
Did you test it using a new QtQuick project or yet something from Examples section?

sierdzio

@qcoderpro said in Qt Creator shows nothing for my first 3D project!:

@sierdzio
Even if I add that line in main.cpp the result is the same: ninja: no work to do!
Did you test it using a new QtQuick project or yet something from Examples section?

Yes, a new QtQuick project.

ninja: no work to do

Maybe you forgot to save main.cpp before building?

qcoderpro

@sierdzio

Yes, I save it (many times press ctrl+S), yet no success!
Here's my project in a QML_2.zp file: https://www.dropbox.com/s/m7nnftx9kwic0pf/QML_2.rar?dl=0

sierdzio

@qcoderpro said in Qt Creator shows nothing for my first 3D project!:

@sierdzio

Yes, I save it (many times press ctrl+S), yet no success!
Here's my project in a QML_2.zp file: https://www.dropbox.com/s/m7nnftx9kwic0pf/QML_2.rar?dl=0

BEFORE QGuiApplication!

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    qputenv("QSG_RHI_BACKEND", "opengl"); // <= WRONG!

qcoderpro

@sierdzio

Here's my main.cpp now:

#include <QGuiApplication>
#include <QQmlApplicationEngine>

int main(int argc, char *argv[])
{
    qputenv("QSG_RHI_BACKEND", "opengl");

    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;
    const QUrl url(u"qrc:/QML_2/Main.qml"_qs);
    QObject::connect(&engine, &QQmlApplicationEngine::objectCreationFailed,
        &app, []() { QCoreApplication::exit(-1); },
        Qt::QueuedConnection);
    engine.load(url);

    return app.exec();
}

Saved and ran it again. Yet nothing!

For Build -> clean (project QML_2), I get these:

Issues Window: warning: ninja: build stopped: subcommand failed.

Complie output window: Running steps for project QML_2...
Starting: "C:\Qt\Tools\CMake_64\bin\cmake.exe" --build D:/Projects/QML/QML_2/build-QML_2-Desktop_Qt_6_5_0_MinGW_64_bit-Debug --target clean
Cleaning additional files...
Cleaning all built files...
FAILED: clean
C:\Qt\Tools\Ninja\ninja.exe -t clean
Cleaning... ninja: error: remove(appQML_2.exe): Permission denied 20 files.
ninja: build stopped: subcommand failed.
The process "C:\Qt\Tools\CMake_64\bin\cmake.exe" exited with code 1.

Shouldn't I use a window instead of an Item in main,qml?

sierdzio

@qcoderpro said in Qt Creator shows nothing for my first 3D project!:

Cleaning... ninja: error: remove(appQML_2.exe): Permission denied 20 files.

You need to fix your permissions problem.

Shouldn't I use a window instead of an Item in main,qml?

Yes. Or put that whole Item inside a Window. Both should work fine.

qcoderpro

@sierdzio

Yes, using a Window instead of that Item solved the issue.

import QtQuick
import QtQuick.Window
import QtDataVisualization

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    Item {
        width: 640
        height: 480

        Bars3D {
// ...

I get this output:

And when I move the mouse holding the right-click button, it shows different views of that, like:

Do you get the output with the same quality?
(If possible send a screenshot of the output once you run the project, please. I just like to be sure about my graphics card performance for that project)

sierdzio

Here you go:

qcoderpro

@sierdzio
Thanks so much for your patience and help. :)