Ah yeah, good point. Landscape shaders are recompiled so that there’s a shader per chunk or something. I haven’t really played with it in relation to landscapes but it seems like a real challenge. Still, I would assume that fetching the material instance and setting a parameter value would work. I can try tonight if you’re still stuck and at least confirm that it’s not working.
Edit: I see the post after that one that CodeCube was successful, so that’s good.