Hello, guys. I understand similar problem has been discussed before, but I my problem is a little different. And I think this is a very common issue. Maybe someone has already know a way of dealing with this problem.
I am creating LOD for high-density overlaid alpha planes. I created the low-mesh however I can not create the texture from render to texture. As render to texture only record the first layer of alpha / diffuse information.
I search on the forum, and see similar problem of creating foliage billboard. Render from ontography camera is the way to go. However this method is not suitable for my case, as the target mesh is more 3d.