I’m not sure whether this is re-creating functionality that other people have already put into papervision, but it was a lot of fun! There are some issues with shaded materials, but so far I have bitmap- and colour materials displaying and it’s looking good.  You can try it for yourself!  Like the pale text says – click in the window to add a vertex, press space to close the shape.  It seems to work even on pretty low-powered machines, so give it a try!