I'm experimenting with the standard Unity trees. When you first create them the shaders they use are "Hidden/Nature/Tree Creator Leaves Optimized" and "Hidden/Nature/Tree Creator Bark Optimized" but this causes error messages to be displayed informing you that the trees need to use the "Nature/Tree Soft Occlusion Bark" and "Nature/Tree Soft Occlusion Leaves." But when I use these shaders the trees turn extremely dark, even when I move them to the "Ambient-Occlusion" folder and reimport them (as instructed in the documentation.) See attached image. I have also noticed that the Hidden/Nature shaders have a "Enable GPU Instancing" checkbox, but do not allow GPU instancing. I messed around with these shaders to enable GPU instancing and managed to increase the performance but it's still pretty poor. Is this normal for trees? Do you need to use Speedtree or an Asset store system to get a nice lush forest?