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I am trying to make an object pull towards another object, then push away in a consistent, even manner. I want them to be rigid bodies and I would like to do this with rigid body constraints and no position/rotation key frames, if possible. I get that a motor drags an object towards and a piston pushes away, but I can't figure out how to combine them.

The end goal is to make a semi-autonomous "hopping machine" that's attach a character to. The character will have some ragdoll physics. I've been inspired by Nikita Diakur's "Fest."

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  • $\begingroup$ do you mean the car movement? $\endgroup$ Commented Sep 13 at 10:50
  • $\begingroup$ Yeah, like a car movement, a piston that pushes and pulled back into place. $\endgroup$ Commented Sep 13 at 13:08

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you can use a (linear) motor, but you still have to use keyframes to change direction (or put on and off).

So i made here a very very basic example:

Plane with rigid body passive. Cube with rigid body active.

One constraint: motor linear, keyframed three position, up, down, up. then added cycle modifier.

enter image description here

Result:

enter image description here

if you want to move it "perfectly" up, add another constraint: slider

result:

enter image description here

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    $\begingroup$ Thank you! Working well. Lots of other dynamics and weights to figure out, but the hopping machine hops. $\endgroup$ Commented Sep 14 at 18:59

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