AIS_InteractiveContext how to use

AIS_InteractiveContext is a class in Open CASCADE Technology (OCCT) that provides an interactive 3D viewer for displaying and manipulating 3D models. Here is an example of how to use it:

1. Create a window and a view:

Handle(Aspect_DisplayConnection) aDispConnection = new Aspect_DisplayConnection();
Handle(Aspect_Window) aWindow = new Aspect_Window(aDispConnection, "My Window", 0, 0, 640, 480);
Handle(V3d_Viewer) aViewer = new V3d_Viewer(aWindow);

2. Create an interactive context:

Handle(AIS_InteractiveContext) anInteractiveContext = new AIS_InteractiveContext(aViewer);

3. Load a 3D model:

Handle(AIS_Shape) aShape = new AIS_Shape(aSolid);
anInteractiveContext->Display(aShape, Standard_True);

4. Start the interactive viewer:

while(!aViewer->IsDone())
{
    aViewer->Redraw();
}

This will display the 3D model and allow the user to interact with it using mouse and keyboard controls. You can also add more functionality, such as selecting and highlighting parts of the model, by using the methods provided by AIS_InteractiveContext.