I have a scene with 2 loaded low poly obj’s and a directional light added to the material of both

dirLight =  new DirectionalLight(0, 1, 0);

For some reason, the two objects have inverted lighting behavior. One object is lit from beneath, the other is lit from above, when they should clearly be having the same lighting. If I change the directional light yDir to -1, then it is the opposite.

Any help?

Well, I opened my files in Maya again, inverted the z axis, reversed the normals, then exported, and this seems to have worked. I think the exported normals that maya created were backwards.