He could still do it in a pixel shader by writing the results to an Unordered Access View at the modified positions instead of to a Render Target. I would recommend a gather approach instead of scatter approach, though, as it might synchronisation of the individual threads, while all the threads are independent when implementing a gather based approach.

He could still do it in a pixel shader by writing the results to an Unordered Access View at the modified positions instead of to a Render Target.

He could still do it in a pixel shader and write the results to an Unordered Access View to the modified positions instead of to a Render Target.