Hi! I was trying to add main light direction to my graph, and saw this post: https://forum.unity.com/threads/shader-graph-light-direction.615316/#post-4238956 This works. However unity keeps warning me that be trying to set a built-in parameter while editing graph. Then I tried to use `_MainLightPosition` from LWRP instead, this time it told me that I'm redefining it. So I use it in a custom function node,and it actually works. The problem is the graph preview is broken, even though the shader compiles. I wander if any of those issues could be fixed. Thanks!