# The incident angle of n1 is going to be updated because of n2 bumping
# the radius of n1's arc around P0b

point_new P0 50 50 2 2

point_new P1a 30 30 2 2
point_new P1b 70 30 2 2

2net_new n_concave 1 3 from P1a concave ccw P0 to P1b
2net_new n_concave 1 3 from P1a concave cw P0 to P1b
