Old PS3 games
"I'm sure we will [retrofit more games with 3D], as adding 3D to a game can make it a whole new experience, " Sony's Simon Benson told Britain's Official PlayStation Magazine. But there's a catch.
"Retrofitting 3D is actually harder than building 3D into a game from the outset. One of the big issues is that all of the game assets were designed to work with only one HD output. Being able to render them twice to make a 3D output can be a challenge.
"Also, the game interfaces are often designed to only work in 2D. The process used [to] covert the games varies greatly... so there isn't really a 'on size fits all' solution."
The interfaces are going to be the killer. You can have all the 3D effects in the world going on around your character, but if there's an unconvincing health bar and map floating weirdly in front of your face, it's going to break the illusion.