Weird tiling shadows

TOADEST
Fri, 13 Mar 2020 15:10:30 +0000
Rendering

The shadow casted by rocks low poly looks weird. The edge is hard but it seems to be some tiling inner, and I don’t know where the tiling pattern being from.

After testing

If I turn down the distance field shadow of the default light source(the directional light), the far prospect weird shadow gone but near one still exist.

If I just set the directional light to invisible, all the shadow gone and scene turns red.

If I just shut the “generate distance filed” option down in the project setting , it still has this wired shadow.
By the way it only affects landscape as I discovered now.

I would be appreciate if you could help me, thank you guys.

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