pele.angleaxis.RigidFragment.distance_squared_grad#
- RigidFragment.distance_squared_grad(com1, p1, com2, p2)[source]#
calculate spring force between 2 sites
- Parameters:
- com1:
center of mass of 1st site
- p1:
angle axis vector of 1st site
- com2:
center of mass of 2nd site
- p2:
angle axis vector of 2nd site
- sitetype: AASiteType, optional
amgle axis site type with mass and moment of inertia tensor
- returns: tuple
spring cart, spring rot