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I want to make a 3D shape move through a specified graph; e.g. y = Sin[x], such that it moves up and down.
My working so far has been to use Manipulate, and I think I want to use it with 'steps', as in the documentation, second one down, although I don't know how to use this.
Would this be the way, and if so how do I use it?

Here is what I have so far:

Manipulate[Graphics3D[{Green, Cuboid[{0, 0, t}], Blue, Cuboid[{0, 0, 0}]}], {t, 0, 3}]

I think I want something like:

Manipulate[ Graphics3D[{Green, Cuboid[{0, 0, t}], Blue, Cuboid[{0, 0, 0}]}],
            {t, 0, 3, y = Sin[x]}]
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Something along these lines? Just want to make sure. Hard to put in the comment. If not will delete.

enter image description here

Manipulate[
 Graphics3D[{Green, Cuboid[{t, 0, Sin[t]}]},
  Axes -> True, PlotRange -> {{-2 Pi , 2 Pi}, {-1, 1}, {-2, 2}}
  ],
 {t, -2 Pi, 2 Pi, .1}]
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