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This current example is made from a composited scene. I want to try to replicate this in shader nodes, what's a shader vector mapping system to get this effect?

enter image description here

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Try this setup:

enter image description here

It calculates where the camera view vector hits the parallax plane (defined with the object's center and $\vec{n}=(0,0,1)$) and uses that to derive the texture coordinates.

Note: you may want to change the usage of the part starting from Looking to Plane? for your needs. In the given setup it just points back to $(0,0)$ texture coordinates to show that the plane is not hit.

Result:

enter image description here

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    $\begingroup$ Cleanly done :) $\endgroup$
    – Robin Betts ♦
    Commented Aug 30, 2023 at 19:14

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