Some normals returning black for no reason

Unity Engine
,
1

I’ve broken it down into it’s simplest form. This is sending me to a ward.

I start with this object:

I run this script on it:

public class MeshGenTest : MonoBehaviour
{
    public GameObject originalObject;

    void Start()
    {
        MeshFilter meshFilter = originalObject.GetComponent<MeshFilter>();

        Mesh newMesh = new();

        newMesh.vertices = meshFilter.sharedMesh.vertices;
        newMesh.triangles = meshFilter.sharedMesh.triangles;
        newMesh.normals = meshFilter.sharedMesh.normals;

        meshFilter.sharedMesh = newMesh;
    }

}

Or maybe this one:

public class MeshGenTest : MonoBehaviour
{
    public GameObject originalObject;

    void Start()
    {
        MeshFilter meshFilter = originalObject.GetComponent<MeshFilter>();

        Mesh newMesh = new();

        newMesh.vertices = meshFilter.sharedMesh.vertices;
        newMesh.triangles = meshFilter.sharedMesh.triangles;
        newMesh.normals = meshFilter.sharedMesh.normals;

        newMesh.RecalculateNormals();

        meshFilter.sharedMesh = newMesh;
    }

}

Or maybe this one:

public class MeshGenTest : MonoBehaviour
{
    public GameObject originalObject;

    void Start()
    {
        MeshFilter meshFilter = originalObject.GetComponent<MeshFilter>();

        Mesh newMesh = new();

        newMesh.vertices = meshFilter.mesh.vertices;
        newMesh.triangles = meshFilter.mesh.triangles;
        newMesh.normals = meshFilter.mesh.normals;

        newMesh.RecalculateTangents();
        newMesh.RecalculateBounds();
        newMesh.RecalculateNormals();

        meshFilter.mesh = newMesh;
    }

}

Every single one returns this mesh like this. Everything I try.

This is me using a normal draw-er script I found online to show that the normals are correct:

This is me probuilderizing the mesh and it’s perfectly fine:

What stupid thing am I missing?

2

Maybe it has something to do with normal mapping? You didn’t copy the uv’s.

3

That is a good guess, but I had considered that and tried for it but it’s not the case. I should’ve mentioned that in the post. I’m using a triplanar shader in the example anyway. I have noticed that adjusting the normal amount on a shader can affect the black effect, it will flicker or actually look correct at certain values. The triplanar shaders definitely give weird results but this issue is not exclusive to them.

4

Are you using the vertex colors? You didn’t copy those either.