IPete: There aren't shadows being cast by the plants. Mike is right. What you think is a shadow is just part of the grass mesh.
It would be completely impractical to have shadows from tiny little plants like that being cast onto a large terrain. The resources required to have that many lightmaps with the resolution required to lightmap a terrain in such a way would be immense.
It would be completely impractical to have shadows from tiny little plants like that being cast onto a large terrain. The resources required to have that many lightmaps with the resolution required to lightmap a terrain in such a way would be immense.