I have a transformation set up in Opengl like this:
glTranslated(pntPos.X(), pntPos.Y(), pntPos.Z());
glRotated(dx, 1, 0, 0);
glRotated(dy, 0, 1, 0);
glRotated(dz, 0, 0, 1);
I use this to Render a freely placeable textbox in 3d space which is based on the FTGL-Toolkit  (for TTF support).
The rendering is performed in a Callback-function registered within V3d_View::SetWindow(...).
This works as expected.
However, i would like to make my text hilightable and selectable using the standard OCC-functions. My approach to do this is To generate a AIS_Face wich bounds my Text. I know the coordinates of this bounding-box _relative_ to my GL-Transformation.
But i have a hard time getting their world coordinates from these. Could you give me some insight on how to retrieve the respective World coordinates of the four vertexes in the bounding Box?