Undistorting an Image in Nuke

[@minyeongjeong]

very useful video and excellent explanation

[@Advection357]

I want to render distorted from the 3D app directly with the ST map's displacement output .exr but so far there are no clear steps... every video skips some part of the process and my image doesn't quite line up. Thank you for the tutorial nonetheless..

[@Sankalpization]

Where can I find this distortion imgae and respective grid for example?