Ok I'm gonna keep this short since for one thing I hear 3D is dying and secondly because I see someone else already mastered the topic here.
So I made this very simple shader that nicely generates a would-like 3D image from the depthmap at-hand - filling the blanks with a twean of sorts that isnt very noticable - the artifacts around objects who are at contrast with something with a far different depth are a little bit noticable, but when you feel the distance between characters, buildings, mountains in the far - you let those artifacts slide. It should work on any game with the depthmap available - setting aside the various ways depth maps are calculated amoungst games - it costs about 1.5fps on a 1920x1080 screen.
I feel ashamed sharing my convoluted code with you guys but I feel the urge to contribute:
Here is the contents of NotWorthy3d.fx (and don't forget to call it that )