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How would I make a green screen that has absolutely 0% reflection, and does not cast or receive shadows? I tried making a plane and making a material and changing the background color, but every time there would be a reflection on the objects in the scene.

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    $\begingroup$ Why do you need the greenscreen? Can't you just render the background as transparent? Also try compositing $\endgroup$
    – J Sargent
    Commented Feb 8, 2015 at 1:57

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This is what the Holdout shader is for:

enter image description here

This shader affects the alpha channel when Transparent is enabled in Render settings > film.

If you really want to create an actual "greenscreen", then see Node for setting render colour, regardless of lighting

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