Refraction displace map render element

[gagui]

It would be great to have a render element with the displacement map needed to distort a background image to match the deformation of the refracted material.
This could make the compositing a lot easier for refracted elements.
Could be possible?

[Dave_Wortley]

Slightly complicated but you can use the VRaySamplerInfo Render Element with a Refraction Vector mode.