I am working on a 3D modeling project using Qt and C++ with the project found on GitHub: 3DViewer-Project-in-Qt-CPP. When I run the project and load multiple models, only the first model appears on the screen.

I’m trying to implement a 3D geometric shape by connecting the points of the shape with a line (starting with just a single line). I’ve already implemented the vertex and fragment shaders and they work whenever I’m using an array of float arrays to store the points, but it doesn’t work if I save the points as QVector3D in QVector – this is a bummer, since QVector allows me to have a variable array length and I don’t need to bother about any sort of resizing.

I have developed a graphics engine in C++ that uses OpenGL. And I built a Qt application. The engine provides creating GLFW window to render graphics on, but I want to render the graphics into a component in the Qt app. After some search I found that Qt has its own opengl interfaces. I do not want to use it because I need to use my engine. So, my question is how to render the graphics produced with my engine in Qt component like we do with glfw: