[PyMOL] how to outline as in ray_trace_mode=2

[O. J. Ganesh]

Hey once again everyone,

   This is along the lines as my previous questions...   When I do:
set ray_trace_mode, 2;
It produces a 'black and white image', however this really is of the outlines 
of the objects in the model.   Is there a way I can manually make certain 
objects into this outline representation?   That is, not filled in with color, 
but outlined instead?   Or just control the thickness of the edges of objects 
in the picture?   This is outline view is fairly different than the other 
representations...

Thanks.