Thanks, Cliff! This test geometry is really helpful. :)

> A raytrace indicates the complex surface structure is there, but 
> unfortunately the shaded display code is showing flat planes for both 
> surfaces, not just the one that's supposed to be flat... 


Although the shaded display code doesn't work for that, we can still use the 
brep command: brep surface_1.s plot S 0. It displays the surface correctly in 
the wire frame.
 

> Wu, I'm not quite sure what the "correct" command to test these two surfaces 
> for intersections would be (the only attempt I've made thus far crashed) but 
> if these turn out to be useful test cases feel free to add them to the test 
> NURBS geometry in the source tree. (dbconcat will be useful for that)
 

It does crash because of a bug in sub_curve(). After fixing the bug, it can 
give us what we want. As the overlap SSI code is still working in process, we 
cannot get the correct finally result yet, but I can show the intersections in 
2D (See the attached image, and the 2D intersections on both surfaces are the 
same.)


Cheers!
Wu

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