The demon warp one is great! But that’s not it… Andrew has that one posted on his website if you’re really looking for it.
The one I’m thinking of might not even have been hosted here. Basically was taking a photo of a gentleman and creating a grayscale displacement map (I think) based on the natual shape of the face… white on nose tip and working back shades of gray the farther back the round of the face, black at the back of the head areas.
Apply the gradient map to the face image and you could get a creepy partial face turn effect that was fairly realistic depending on how detailed your map was…
The effect he used might not even be displacment which would be why I’m having major issues finding it again.
Thanks for the response!