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I'm just trying to get an object to come out of the floor (the floor is real footage and object is just motion tracked in)this is what I want it to do

Now the floor I want to be invisible so it doesn't show in the final render, but still hide the cube until it passes through.

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This is how you do that: enter image description here

The cube needs this material, you can exchange the diffuse shader by any node tree you want, but the last node must be the mix shader with the holdout and transparent depth as factor. The plane needs a transparent shader. Everywhere the cube would be visible through the transparent plane, it will be alpha.

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