I am applying forces to two certain joints using: physics::JointPtr joint1=this->model->GetJoint("n1_n3_one"); physics::JointPtr joint2=this->model->GetJoint("n1_n3_three"); joint1->SetForce(0, 10000.00); joint2->SetForce(0, 10000.00); in .cc file for plugin. How to modify my code to apply this amount of force every fourth second to my model joints? Thanks in advance