Trajectory planning what? Actually solving the inverse kinematics of 3dof manipulators is trivial. I did so 20 years ago using a Basic Stamp microcontroller for my 18 servo hexapod. I was 15.
Planning foot placement is a bit harder but I would say the compute heavy part today would be perception.
I think of “trajectory planning” as: you have a known target position and you have to figure out how to get there. That’s not hard with a 3dof manipulator.
But figuring out where to place the feet, which I consider a perception problem, is very hard. But I think that’s what you’re talking about and I just use different terminology. That’s why I was confused. Sorry if I came off wrong.
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