It's getting weirder, because I've just managed to get your other code field depth vision to work.

I did changed the layers (from -1,-2 to 19 and 20), but it can't possible be that since it gave a blue layer
on top.
I've also changed the tga file a few times, even tried stuff with colored tgas, saved as 24bit. I also added a hollow cube around my level, but I guess I could take that one away again.
Anyways, it must be something I did wrong at some point with this code, or render-to-texture started working properly again somehow, because I got depth field vision working now, I guess all I have to do is strip this code down to get the motion blur,

Cheers