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2

Shrinkwrap constraint is pretty good for this, to control how far your object is from the ground you can simply lift it in edit mode to move it's origin downward.


1

Here are 2 pistons one with with 2 and one with 3 sections I got the solution from Here after using the track to constraint instead of the damped track which I mistakenly took for a look at constraint from 3ds max. The Track to constraint has all sorts of issues like spinning mesh the Damped track doesn't seem to. I realize after 7 months you probably ...


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