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Depth of field using Zdefocus in nuke . Help!


Hi ,
I am trying to mimic depth of field using Zdefocus in Nuke. I have a Z depth pass and a World position from Corona pass but I cant seem to get it to work. Does anyone have a way of doing this ?

Increase blur and Ctrl+click on the canvas where you want the image to remain in focus (?)

I'm looking for a way to assemble the nodes and/or how to read the World position AOV correctly . Which I don't think I am doing.  Neither plugging the z depth or the world position aov into the zdefocus node makes any different to the depth of field.In focal plane setup I just get blue ( with the colour image in the background) There's no red green and blue zones which I would expect to see.


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