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Cool idea! I was planning to implement something similar that just renders a partial ellipse as an orbital trajectory once the altitude was sufficiently high, but I didn't have enough time. It would be cool if such an indicator could also take air resistance into account such that the trajectory starts going down towards the earth if it gets into the atmosphere. I don't know if I have the physics expertise to do such a thing, but I might try later!

Air resistance would be tricky to model, but there's probably a simple calculation that would let you show a rough trajectory based on your current velocity. I'm not sure if I know what to Google, but the formulas for projectile motion and/or Kepler's laws of planetary motion might be a place to start?