Game Development

I'd be happy to look into this if you could provide a small example to reproduce the crash (ideally in a bugreport). This may already be fixed in the git version of Qt3D.

We can discuss removing the default point light. I think the reason it was added was that you would still have some light effect even if you forget to set a light. Obviously that may not be what everyone wants.

Hi Clockwork

I didnt read your code with much attention, but for starters if all you want is draw a triangle, check this tutorials I did https://bitbucket.org/joaodeusmorgado/opengltutorials
I'm using vbos, to draw triangles. I'm using all OpenGL native calls, but should be pretty easy to convert to Qt OpenGL functions. I also recommend you this book wich is great, it has a lot of details that usually are ommited in other books http://alfonse.bitbucket.org/oldtut/index.html

Hi,

What kind of camera are you going to connect to ? Are they already supported by GStreamer ?

@Dabulla Hi! Would be great if you'd file a bug report for this PointSize RenderState issue. Thank you :)

I had misconfigured ensureVisible's margins , and the view's size and the scene's rect .
Now it works fine :)

I'd recommend reading this article which explains everything fairly well: Coordinate System

As the article explains, each graphics item maintains it's own coordinate system. The methods you are referring to are used to translate coordinates between those items, between the items and the scene and so on.
I hope that reading that article will help, otherwise feel free to ask if clarification is needed.

Haaaaaa… I missed that… You didn't pass the pointer to the QImage data...

The new qt3d update fixed the input api for c++.

Thanks for the help guys.

According to the QWGLNativeContext documentation and some online examples, I set up this little function to try and initialize a QOpenGLContext from an existing and already initialized SDL2 context:

void QtHooks::initQtOpenGlContext(SDL_Window *screen) { assert(screen); QOpenGLContext *context = new QOpenGLContext; SDL_SysWMinfo sysInfo; SDL_VERSION(&sysInfo.version); SDL_GetWindowWMInfo(screen, &sysInfo); HGLRC currentContext = wglGetCurrentContext(); HWND currentWindow = sysInfo.info.win.window; assert(currentContext); assert(currentWindow); QWGLNativeContext nativeContext(currentContext, currentWindow); context->setNativeHandle(QVariant::fromValue(nativeContext)); assert(qtContext->isValid()); // <<-- this line always fails context->create(); // if i remove the previous assert, this line kills the application very badly }

This little example always fails in the last two lines. Am I missing something?

Hi,

Qt3D being still a tech preview and it's API evolving, I'd recommend posting this question on the interest mailing list. You'll find there Qt's developers/maintainers. This forum is more user oriented.

There could be quite a few thing wrong. Could you try using power-of-two textures to see if the images start showing (resize the images to a 512x512 or 256x256) and ensure the image is completely defined?
https://www.opengl.org/wiki/Common_Mistakes#Creating_a_complete_texture

It would help if you provided code for the entire application.