What I’m concerned is, those polygonal details are so small they don’t really matter, and your polygon budget would be better spent elsewhere. If you can combine the mushroom into one material, that’s one less draw call per-mushroom that you’re ultimately saving, which is great. But UE 4.7 seems to handle instancing fantastically, so, I guess this wouldn’t be a problem :S If you set LODs properly, I guess it won’t be that big of a deal.
It would be nice to see a video of just the grass/foliage wind. A little bit of it can really breathe life into a project like this.
Translucency sorting is not as much of a concern if you’re making a puddle of water or particle effects. Now that I think about it, opaque water would look very thick, and that’s not the style you’re going for.
There is a preview version available right now, or you can wait like a week or two and get the final build.