Game Development

I checked on Qt5.12 and 5.13.
renderSettings->pickingSettings()->setPickMethod(Qt3DRender::QPickingSettings::PointPicking);
renderSettings->pickingSettings()->setWorldSpaceTolerance(10.0f);

But I can't pick the primitive point.

@Jun-wong I guess this SDK provides C/C++ library? In general there is nothing special about Qt here, Qt is simply a C++ framework. Check the documentation of that SDK to see how to use it in C++ applications.

@SGaist
Thanks for answering.
Basically, I am separating rendering and updating to have fixed-timestep updating (for physics etc) as well as as-fast-as-possible rendering with time interpolation. (Heavily heavily inspired from Gaffer on Games article)
My code looks as follows (only slightly simplified):

... within my OpenGLContext void GLWindow::gameLoop() { const double delta = 1.0 / fixedUpdatesPerSecond; auto time = QDateTime::currentMSecsSinceEpoch(); double accumulated = 0.0; while (! this->terminate) { auto newTime = QDateTime::currentMSecsSinceEpoch(); double frameExecution = tdiff(time, newTime); time = newTime; accumulated += frameExecution; while (accumulated >= delta) { // Handle user input / system polling //However, since Qt has event driven polling, let's just call processEvents and then handle any input events by putting their results into a map. QCoreApplication::processEvents(); // Update our states this->updateState(delta); accumulated -= delta; } this->render(accumulated / delta); } }

In the same class, I have updateState and render:

void MyGL::updateState(float delta) { //... Bunch of commented-out code to make sure base loop works first if(myKeys.at(Qt::Key_W)) { cam->translateAlongForward(delta * 3.0); cam->update(); } } void MyGL::render(float aheadAlphaPercent) { this->update(); } void MyGL::paintGL() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); lambertShader->setViewProj(cam->matrix()); // a lot of other drawing stuff }

I know that my rendering code itself works because I initially tested it by just using a QTimer.

Instead, I now do the following:

...in main... QApplication a(argc, argv); QSurfaceFormat::setDefaultFormat(format); MainWindow w; w.show(); w.start(); //return a.exec(); // ^Dont^want^to^uncomment^this^ ... MainWindow::start (MainWindow is QMainWindow subclass)... uiElements->glWindow->gameLoop(); //glWindow is subclass of OpenGLContext

As you can see, I tried to avoid calling Qt's blocking event loop in QApplication::exec, but am still polling events. However, this doesn't work properly, as described in my first post.

@U7Development said in Parsing Qt Game Dev:

is this a game or render engine?

No, it's not. Qt is a C++ framework supporting UI, network and many other domains, but it is not a game engine. What it supports is OpenGL programming, see https://doc.qt.io/qt-5/qtgui-index.html#opengl-and-opengl-es-integration

The OpenGL Cube example shows the technique to map a PNG containing all the cube faces on a 3D cube.

in case somebody interested in result)
it is there
https://play.google.com/store/apps/details?id=ua.sp.games.DragonMykyta

@Bondrusiek i will check it out ty

@mkss QCheckBox has a build in try state functionality

https://doc.qt.io/qt-5/qcheckbox.html

if that helps

As it turned out, the per-installed version of QT 5.7.1 after installing libmali works fine with xcb and GPU acceleration, which probably indicates that the installation path of QT 5.13.0 is not correct, it is also possible to correct the location of the libraries. Probably the setting path should coincide with the location(5.13.0) of the qt5 folder where version 5.7.1 is installed.

@mrjj
I'll try working with it and i'll see how it goes. Thank you very much for everything !

@mrjj Thank you for the link and regarding the multiplayer my teacher said that i can do either over the internet or LAN , i believe LAN is a much simplier thing to work with so i'd probably go with that if there are any stuff regarding this topic, for my graduation project it's required for game to be played by ( for example 4 ) players, but each player has to play the game on their own PC.
@jksh ye i wanted to implement that into my game and of course like i said player vs the pc, but my professor said that i should put a multiplayer option in there aswell if i want to get a better grade.

Hi and welcome to devnet,

You should add:

Qt version used Linux distribution used Device connected How did you install Qt

Can you try with the latest Qt 5.13 version ?

for anyone interested.
Here is the link to the bug report on Jira:
https://bugreports.qt.io/browse/QTBUG-75373

you can upvote it there to give it more attention

Apparently.

This was working before. Looking through the documentation it seems this was not the best use case for the tree view so it looks like a safe change on our side.

@hskoglund
I drew hexagons on a UNIX box more-years-ago-than-I-care-to-admit. I doubt I used floating point sine/cosine calculations. Don't the vertices come out at some nice integer coordinate values for 60 degrees if you pick a suitable integer for the side lengths?

a slight complication in those days was the x/y ratio for the screen pixels, it wasn't 1:1

That's not your problem as a programmer! 60 degrees is 60 degrees. The user can go buy a different monitor/graphics card if his ratio is not right :)

I've got the same issue with Qt3DExtras::QText2DEntity. But I found the workaround.
Look like there is a bug? in implementation of Qt3DExtras::QText2DEntity that prevents internal initialization (QText2DEntityPrivate::setScene is never called). This happens when scene is already visible and Qt3DExtras::QText2DEntity is created with parent entity passed to constructor. The workaround I used to make it work is to pass nullptr (which is default) as parent in constructor and call ->setParent(parentEntity) in separate call.

m_text2dLabel = new Qt3DExtras::QText2DEntity(); m_text2dLabel->setParent(parentNode);

@mrjj Haha, I suppose it does. I think if it were in circles or odd shapes it'd look more like it. hehe.