Hi, I was look around and could not find a solution for this. What I need is a window element with a 3d object moving on the inside, how can I do this?

here's a graphic representation of what I want


this is the window element I'm using, the problem is that inside I don't want a panel instead I want to use a 3d object

PANEL* frame_pan =
{
bmap = frame_png;
layer = 20;
flags = OVERLAY | SHOW ;
window (40, 10, 178, 160, map_3d, 0, test);

}

I hope there is a way to do this =/ I can't see the solution but maybe you can, thanks for reading.