I have a simple experimental scene with 2 planes, a sphere, and the sun. I created the material for the first (larger) plane and created a group node. Then I created the second (smaller) plane and applied the same material to it.
But the second plane is not illuminated by the sun - it does not “see” the sun at all. I also tried simply duplicating the first plane and that works.
I also eliminated the material from the first plane and re-applied it. That worked, so the node group is fine.
So there must be a difference between the planes, but I can’t find it. I want to be able to append this node group to other objects, but it only works for this one plane or its clones.
I cannot find a reason for this. Attached is a JPG so you can see it and also the Blend file. Thanks for any clues.
ROUGH GROUND.blend (1.9 MB)