r2 r1 spine t1 t2 P r1, r2 : reference curves t1, t2 : target curves P : plane normal to the spine Ir1: intersection between P and r1 Ir2: intersection between P and r2 It1: intersection between P and t1 It2: intersection between P and t2 It2 It1 Ir1 Ir2 dir Q Qr (v) Qt (v) Qd P Ispine
P P
Initial element Limiting element Edge to be filleted edgefillet15NLS.gif