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Topic says it all. I tested it with mesh_base, mesh_leaf_base and mesh_stem_base materials. When two-sided flag is set, in deferred light mode back side surfaces are lightened too (missing light_direction multiplier somewhere?). Duplicating the geometry with normals flipped fixes the issue. It is very easy to reproduce: - open sample scene with one world light (i.e. library_vegetation); - put here palm tree model from Tropics demo (i.e. palm_coconut_green1.mesh); - assign two-sided material to palm1_leaves_* surfaces; - place camera below the tree and turn on 'Force deferred lighing' for the sun; I hope it is just a minor bug that could be fixed for upcoming update.