> And I find that ON_SSX_EVENT only supports a single curve, so if there are 
> more than one intersection curves generated by SSI, multiple ON_SSX_EVENT 
> objects should be returned?
 

Yep, I find that ON_Surface::IntersectSurface() returns an 
ON_ClassArray<ON_SSX_EVENT> &x, and ON_Curve::IntersectCurve() returns an 
ON_SimpleArray<ON_X_EVENT>& x.


Cheers!
Wu
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