Game Development

[image: b1158623-f24e-4104-894e-84fd254a3468.png] We built the abive 2D game app in Qt QML back in 2013, before Android gaming took off. We implemented X-Y movement, acceleration physics, joystick controls and more, all in QML — a genuinely fun project. But my honest takeaway after ~10 years of Qt work: Qt is not built for games. Its strength is putting a clean UI on top of complex hardware and machinery — industrial systems, automotive HMI, embedded devices. That's where it shines. Games need rich animation pipelines, physics engines, asset tooling and GPU-focused rendering — areas where engines like Unity, Unreal or Godot are far better served. So my suggestion: if you're serious about game development, learn a dedicated game engine. If what actually excites you is engineering — machinery, hardware, instrumentation — then Qt is an excellent fit, and the official Qt Academy courses (qt.io/academy) are a good free starting point.

@JorgeT said in [QT Quick 3D] QRchi shaders and QQuick3DRenderExtension: Hi everyone. I'm trying to create a render extension node for View3d, but i cannot find any useful documentation. I saw the OutlineRender example in the QQuick3D examples, but it doesn't use any shaders at all: https://doc.qt.io/qt-6/qtquick3d-extensions-stenciloutline-example[.].html Later, i found this QRhi example on the Qt documentation, but i couldn't get it to work and it doesn't use QQuick3DRenderExtension https://doc.qt.io/qt-6/qrhi.html What I’m trying to do is apply a shader as a post-process to the View3D framebuffer using the extension property list. Could anyone either explain the QRhi example or provide a commented example that goes through each step? I have experience with OpenGL, but I just can’t get this to work. Thanks!!

Okay, thank you for your efforts. I will close this issue now as "Not possible to support legacy hardware with a Qt6.8 Setup". Minimum requirements: Direct3D11 or GLSL best regards, kevin_d

Debug drawer for Box2D v3 using QPainter It uses b2World_Draw to draw Box2D objects for debugging. You can just download and run it without compiling libs because it include libs for Windows (MinGW) and Android. Source: https://github.com/8Observer8/debug-drawer-qpainter-box2dv3-qt6-cpp [image: 2a9af153-b7d2-40a0-9702-5fdfb79ccf52.png]

Issue moved to bug tracker : : https://bugreports.qt.io/browse/QTBUG-113795 and https://bugreports.qt.io/browse/QTBUG-116493

@8Observer8, Nice to hear that you like it! As for the offset — it's not a bug, it's a feature ;D. I originally designed the game for a standard window size, where the position (-2, -2) hides those elements. However, when using a browser, the background can be larger, which makes some items visible.

Hi @meme001 Your proactive steps for UI performance on Android devices should be Utilizing Loader for deferred component initialization Minimizing constantly-updating bindings Optimizing image assets To further enhance UI responsiveness on Android, Consider this Leverage (QtQuick.Controls 2) Optimize Animations Profile with Qt Tools Reduce Overdraw Resource Management Asynchronous Operations Remember, performance optimization is an iterative process. Regular profiling & testing across different devices can provide insights into areas needing improvement.

Well thanks for all your suggestions! Thread solved. best regards

@SrisharanVS said in LAN Communication for my Multiplayer Board Game on QT/QML: Could anyone guide me on how to handle LAN discovery, establish a connection, and start communicating? If you know of any similar projects, tutorials, or helpful resources, I'd really appreciate it. Start here https://doc.qt.io/qt-6/qtnetwork-programming.html

Hi, try use key handling in this way: https://stackoverflow.com/questions/23816380/using-multiple-keys-in-qt-c I implement this in my simple qt game. Can check: https://github.com/Przemekkkth/top-down-shooter-qt

I added -x instead of x and It is working better.

@Pl45m4 Thank you for those ideas. I'm feeling less wandering-the-wilderness now, thanks to the advice I'm getting here.

It appears as if I have mutliple engines installed on my setup. So, instead of auto *text2speech = new QTextToSpeech(this); i changed my code accordingly: for (auto const& v : QTextToSpeech::availableEngines()) { qDebug() << "available engine: " << v.toStdString(); auto *text2Speech = new QTextToSpeech(v); // find suitable locales } So I am not randomizing voices anymore. I take the first best english voice. It works. Now testing on Linux :-) best regards, kevin_d

@Ejok88 Hi I used the the book of shaders site tutorials to create the fuzzy circle check here https://thebookofshaders.com/ I actually got a very simple idea for your problem, just use a line with width which is just nothing more that a rectangle with two colors on the edjes, and use GL_TRIANGLE_STRIP , see this new example https://bitbucket.org/joaodeusmorgado/opengltutorials/src/master/T11_FuzzyLine/mygl.cpp#lines-185 Then you just add vertices to compose your line, note that you have to use "two" lines side by side to make the double fade out effect. Then you need to add 3 more lines without width, to the center and the 2 lines in the extremes. A bit of work but doable. I can help further if you need, but right now I just to much work overloaded. What is your use case, are you using widgets and Opengl ? I think going with quick3d would be easier, it that is an option for you.

Hi, i was also looking for such a module in pure Qt/C++ some time ago. Unfortunately, as far as I know, there is no such equivalent. If you want to achieve such results, you have to use either QPainter or OpenGL.