Two different extrusion normals for same curve - each endpoint

Hi, 

I i'm trying to extrude a selection of curves with in the direction of a normal from evaluate surface. My problem is that where my curves meet they need to be extruded in two different directions. Is there a smart way to do this.

triangle 1,2,3 all meet in the same centerpoint(point 2), but on the other side they all have there own point (ex. point 1)

I hope you guys have a suggestion for a solution to my problem.