Speedtree v8 Support

[ROBYER1]

Speedtree8 shaders seem very much broken in URP and built-in renderer, see the Speedtrees at the far right side of the videos on this post:

Case 1221827 URP -Terrain LightProbes for Speedtree7/8 shaders bake black

Reported at (Case 1221827) [URP][Terrain][Speedtree]Terrain LightProbes for Speedtree7/8 shaders bake black When importing Speedtree shaders into URP, we noticed that once the light mode was set to baked only on the directional light in our scene, the speedtree shaders bake out completely black from Terrain Light probes. Prior to baking (with all baked lighting cleared), the trees just have a dark side where they are in shadow but this is very dark and looks ugly nomatter what we do with Shadow…