When I set up some sort of light for example a PointLight and put it on the left side of a model. For some models the left side gets brighter but for other models the right side gets brighter, although the light is on the left side? Same with other light Sources.
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Perhaps the other models are inside-out: their mesh normals point inward instead of outward.
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Also, example code would be useful to make sure there isn’t something else going on (like sharing a Vector3f for dir that changes later, etc.)
TangentBinormalGenerator can help visualize the normals of your mesh.
genNormalLines(Mesh mesh, float scale) will return a new (unlit) mesh representing the normal vectors at each vertex of the mesh passed in.
Edit:
if your mesh is not centered at origin, you may want to align the returned “normals” mesh appropriately.