This one is proving particularly frustrating. I'm sure it's something stupid I'm overlooking, but...
Anyway. I've got a composite shot in my project with a bitmap set as a 3D plane and a bunch of models, all 3D unrolled. I drop a light into the space and... nothing. Directional, spot, ambient, none of them do anything.
I'd assume the models weren't set up correctly, but they are; I'm using them elsewhere in the project in different comps, and they're being lit just fine. In fact, if I copy-paste one of the lit objects from the other comp into this one, it shows up lit and reacts to whatever light I've put in the scene. If I drop a blank, colored 3D plane into the scene, it's lit properly as well.
I've gone over the settings of each model in the scene with a fine-toothed comb a dozen times over, but there's absolutely no difference between the lit version and the unlit version.
What could I possibly be doing wrong?