I'm still confused with Physic and Constraints. I'd like to have two bodies - connected together by hinge (let say vertical beam on a platform , connected to horizontal beam). I'd like to move the platform from one place to another, keeping vertical beam on top, and have hinges working). I've tried hook modifier, a few constraints - but it does not work somehow. Either vertical beam follows the platform and hinge stop working, or hinge is working and beam does not follow the platform. I animate platform (with keyframes) and move it from one place to another.