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Questions tagged [qopenglwidget]

44 questions
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1 answer

What is the performance difference between QOpenGLWindow and QOpenGLWidget?

I have been looking into the two classes QOpenGLWindow and QOpenGLWidget. And in the documentation of QOpenGLWindow it states: "Unlike QOpenGLWidget, QOpenGLWindow has no dependency on the widgets module and offers better performance." In my current…
Sailanarmo
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Is it possible to have a transparent QMainWindow and QOpenGLWidget with an opaque child toolbar?

I would like to have an opaque QWidget in a transparent QMainWindow. The QMainWindow's centralWidget contains a QWidget and a QOpenGLWidget in a vertical layout. The QOpenGLWidget is drawing correctly with rendered objects being opaque and the…
TheShiftingInt
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1 answer

Qt Button Group over OpenGLWidget

I am designing a user interface with Qt Creator. I have a openGLwidget which covers all the form and I want to place some buttons aligned to bottom and some kind of notification frames over the widget. Is there any default way to do that? When I try…
meakcey
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Objects are transparent when using QPainter

So I've tried to put labels on my objects. I tried out a test example to just put one simple label there. When I ran the program, however, all the objects were somewhat transparent. paintGL: void mainWidget::paintGL(){ QPainter painter(this); …
new Q Open Wid
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How to render some vertices in a buffer as points and the rest using lines in qopenglwidget?

I have a set of vertices and normals stored in a buffer. I want to display most of the vertices as points but i want draw lines for the remaining few vertices. These are all stored inside one vector with the points part in the front and i know the…
anirudh puligandla
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Alleviating input latency for implementation of QOpenGLWidget

I am implementing a custom QOpenGLWidget in Qt6 and have overridden paintGL() and mouseMoveEvent() to render a triangle that follows the movement of the mouse. However, I notice that the triangle is always lagging a frame or more "behind" the…
Mr. Developerdude
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My QOpenGLWidget only produce a black screen

I'm trying to make a QOpenGlWidget of the qt part of this library (https://github.com/melowntech/vts-browser-cpp) and i'm currently with a black screen widget while all functions seems to be running fine. my widget cpp #include…
biscuitvanille
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Couldn't render OpenGLES context in Qt

I am trying to use OpenGLES in a desktop platform. I have a class whose name is GraphicsViewer which is derived from QOpenGLWidget. When I set the QSurfaceFormat::renderableType to QSurfaceFormat::OpenGLES, I get the following errors and nothing is…
iammetehan
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Draw GL_LINE in QOpenGLWidget using array of coordinates

I have working application done using QtCreator. My render class is GLRendWindow::GLRendWindow(QWidget *parent): QOpenGLWidget(parent) Now I would like to draw objects using arrays with coordinates of vertices. I found some tutorial that draws…
rainbow
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Get openGLwidget linked with Qtimer update

I m trying to build a gui with Pyqt5. and withing the gui there is an openGLwidget, that should contain a rotating cube. But i cannot figure out how to make the cube rotate. Thank you. this is the setup function def setupUI(self): …
Nadsah
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How to reduce the lag in OpenGl?

I wrote a little application, which replaces the cursor with a hand drawn cursor. Therefor i used a QOpenGlWidget. For the animation i use the frameSwapped signal: connect(this, SIGNAL(frameSwapped()), this, SLOT(update())); Till now i don't use…
moritz
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How to add QOpenGLWidget to QGraphicsScene?

My main.cpp int main(int argc, char *argv[]) { QApplication a(argc, argv); QSurfaceFormat format; format.setDepthBufferSize(24); format.setStencilBufferSize(8); format.setVersion(3, 2); …
Syaiful Nizam Yahya
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QOpenGL error : "Invalid VAO/VBO/pointer usage" "Array object is not active"

I'm currently trying to render a skybox using the QOpenGL library of Qt. For that, I tried to modify the QOpenGL "cube" example that is provided by Qt (I'm using the latest Qt 5.13 version). The vertex and index buffers are initialized in a class…
JervisCrane
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Text dissapears on QOpenGLWidget after undocking

I'm trying to integrate Qt5 and OpenSceneGraph. I've found this minimal example of embedding. When I encapsulate the widget, defined in the example, into a QDockWidget and add a simple text label to the example, the text dissapears when I undock the…
user20679
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Qmatrix4x4 translate does not take any effect

I didn't have a lot experience in opengl, so excuse me if the question is silly. I'm trying to move triangle with the mouseMoveEvent by translating Qmatrix4x4 field in my class glView. When i did not do anything (perspective, translate with matrix)…
TreshUp
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