As doctors perform a battery of tests on Jamie Foxx, producers of the movie he was shooting are clearly pivoting … trying to figure out how to proceed in his absence.

Check out the pics from the set of “Back in Action” Thursday night … where Jamie’s stunt double, Travis Parker, was shooting a scene with Cameron Diaz.

TMZ broke the story … Jamie’s doctors still don’t know what’s at the root of a very serious medical emergency that landed him in the hospital Tuesday morning … so serious family flew in from out of town to be with him.

Jamie will be in the hospital for at least a few more days, our sources say, and it’s unclear when he’ll be able to go back to work.

As we reported, we’re told he has 8 shooting days left for the film, but production sources say they expect to wrap next week. Unclear how this information aligns.