Like tree leaves in nature have two sides, front and back, is there a way to replicate this? currently two sided foilage material is showing the same texture on both sides. Is it possible to apply different textures\materials ?
while what clockwork said is a “way” to get it working, why not just use a 2-sided sign node?
you can use the same setup to lerp between a normal map and a normal map with the green channel inverted to create a better-looking bottom side of the leaf.
Material on foliage, is just material on a mesh, basically. If you want the mesh to look different on the underside, you would need to specifically map that out in the UVs for the mesh, and assign different materials to each side.
Having said that, there’s a lot of ‘sexy’ stuff you can do inside materials with normals, world orientation etc. So you could do some sort of thing where you add another texture to leaves, if they are facing the ground etc.
The downside is, you want foliage to run as quickly as possible, and doing all this sort of thing, then, isn’t a good idea. Unless you’re doing archviz.