def seed(trimer_generator, options):
seed_vertex1 = Vertex(np.array([198.829, 170.530, 360.401]))
seed_vertex2 = Vertex(np.array([161.790, 244.135, 376.374]))
seed_vertex3 = Vertex(np.array([124.752, 199.392, 315.765]))
seed_edge1 = Edge([seed_vertex1, seed_vertex2])
seed_edge2 = Edge([seed_vertex2, seed_vertex3])
seed_edge3 = Edge([seed_vertex3, seed_vertex1])
seed_trimer = Trimer([seed_edge1, seed_edge2, seed_edge3])
seed_center = np.array([231.149, 245.5, 262.1035])
particle = Particle(seed_trimer,
trimer_generator=trimer_generator,
options=options)
particle.centroid = seed_center
return particle
