So I checked the web and didn't see any clue, am I the only one to face this problem? Placing a directional light in the scene end up rendering trees this way: I took a look in the import settings of the leaves textures and tweak a lot of things ending with no good result. It seems Unity doesn't want me to render at least bareable trees. Anyone has ever face this issue and know how to solve it? This is upcoming under unity 5 but didn't try to download Unity 4 to see if it happens in it too. Edit: I should precise some configuration, it happens only in Deffered Rendering when I put a Directional Light that cast Shadows.