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Something about displacement map and normal map

Hello everyone, this is David.

I just have an question about why I can’t just use one displacement map instead of displacement + normal?
When I use only displacement map, there’s no shadow on the plane.
Is there any mistakes on my shader or texture setting?

Could someone help me, please?

Thank you for your reply ClockworkOcen.

But you know, when you use a height map for landscape, you don’t need and normal map but can get a great shading object, right? Is there just the way I used is wrong or anything else? I think may be there any way to let the displacement work.