Black trees

Why are the trees in my scenes mostly pitch black when I use shadows? In this screenshot I´m using speedtrees and realtime shadows from a directional light. If I turn the shadows off they look ok but that takes me to another question. They look “cartoonish” and not nearly as good as most of the screenshots/videos of speedtrees I have seen.

I think your ambient lighting is turned all the way down, put it to gradient or skybox ambient lighting and crank it up to the brightness you want. Or increase the brightness of the directional light.

I tried with a lot of different ambient lighting settings without success. Increasing the directional light make everything else super-bright though.