I'm probably mistaken but I thought I read once that any Forest objects could be converted or turned into Billboards. I have some grass and changed the 'Template' to 'Two Planes' and that's what I get, two planes of green. There is no alpha so, therefore, no plant shape.
I need to render reflections of trees and grass in a river surface but don't want to render the forest object in high resolution. The renders are about 15-minutes each.
If I can't set the forests to render as Billboards, is there a workflow that I can use to get the plants reflections without having to do the really long renders?