Not sure how to get started.
I am trying to make an application that would be used as a level editor for a game I am making. I am looking for it to have a central panel that would be 3D interact-able. I want to be able to drag over a stock shape, a cube or sphere, from the side panel and drop it into the main field. There are more features I want to implement later but I wanted to get start on the heart of the application first and try to learn as much as possible.
Thanks in advance.
I'd suggest you to start with the QGLWidget as a viewport. This will allow you to draw your 3d objects. You'll need to implement all the Drag and Drop events (dragEnterEvent, dragLeaveEvent, dragMoveEvent and dropEvent).
I also suggest you to use a QMainWindow with dockable widgets from where you can grab your assets and drop them in your 3D viewport.
I implemented something similar in my own image editing application:
Good luck with your game!