Getting a proper Z-buffer in Fusion

Many OFX or direct Fusion Depth blur plugins does not support Fusions Z-channel and need a bitmap input for the depth representation.

So i wanted to get a Z buffer into a map, by using a ChannelBoolean and moving the Zbuffer over to a blank plate. The problem is that the depth buffer is not normalized and impossible to work with unless you scale up the work to something gigantic.


(Top; Original Depth Buffer. Buttom; Attempt to "normalize" the depth buffer)
(Note that the white plate is just placed there to show that there infact is a darker area somewhere in the distance.)

Is there a way to control this, or a way to get a proper depth map in Fusion?

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