Eevee and hole in the shadow

I try Eevee for the first time, but I don’t understand some behaviour.
I do a very simple object, with very simple material and a very simple lighting, and I have a “hole” in my shadow :

Why I have this part of my object with light?
How ca I do to have more normal shadow?

It’s hard to say, I don’t really know what your object looks like nor what your lighting setup is :man_shrugging:t3: A wireframe render would be helpful, as well as a viewport showing the light angle.

That aside… have you checked face orientation? Viewport Overlays >. Face Orientation, anything red needs Mesh > normals > flip

You are right, that was a face orientation problem. My object is a curved plane so there is always some face that are badly oriented. I have added a “solidify” modifier and that solve my problem.

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