static [FReal](API\Runtime\ChaosCore\Chaos\FReal) GetSwingStiffness ( const [FPBDJointSolverSettings](API\Runtime\Chaos\Chaos\FPBDJointSolverSettings) & SolverSettings, const [FPBDJointSettings](API\Runtime\Chaos\Chaos\FPBDJointSettings) & JointSettings )