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Hello Community, Been looking and exploring nodes for a while now and I cannot find the answer to this problem. How to apply a force to an object in it's own local frame so even when I do rotate that object, the force is applied let's say in the y axis. To give you guys some context, I want to model a quadrotor, and have the guy have 4 propellers in which I want to put uniform forces to each of them to drive a point in the quadrotor. Then, by modifying the values of the propellers, I could eventually model it's yaw, pitch and roll with just forces and torques. But all the force nodes I seem to explore are in the GLOBAL frame and you apply it to the absolute y of Houdini and not to it's local y. Any idea how I can solve this?? Thanks a lot once again! Francisco.