Energy3d
val linear_kinetic : Body3d.t -> float
val rotational_kinetic : Body3d.t -> float
val kinetic : Body3d.t -> float
val momentum : Body3d.t -> Vec3.t
val angular : Body3d.t -> Vec3.t
val angular_momentum : around:Vec3.t -> Body3d.t -> Vec3.t
val gravity : g:float -> Body3d.t -> float