td_points = {pos = {x=0.0, y=-0.179, z= -4.298}, stiffness=1e8, damping=1e6, mu=1.6, mu_lng=0.1},
{pos = {x=-0.921, y=-1.3565,z= 0.87}, stiffness=1e8, damping=1e6, mu=1.6, mu_lng=0.1},
{pos = {x= 0.921, y=-1.3565, z=0.87}, stiffness=1e8, damping=1e6, mu=1.6...