Filled faces have weird shadows

[nicki.t (nicki)]

hello, when I want to fill 4 selected vertices to get a face to connect 2 different objects, the face gets weird shadows and I also can’t sculpt the face. How can I remove these shadows and create a normal face ?

[tricotou]

You might have a normal problem, where the two objects does not have normals in the same direction, like this :

(You can display normals in Overlays params in Edit Mode)

Try to recalculate normals outside on both meshes before creating a new face

See you ++
Tricotou

[nicki.t (nicki)]

thanks !!!