UnityEditor.InternalMeshUtil.HasNormals C# (CSharp) Method

        public static extern bool HasNormals(Mesh mesh);
    }

        static bool HasNormals(Renderer renderer)
        {
            Mesh mesh = null;

            if (renderer is MeshRenderer)
            {
                MeshFilter mf = renderer.GetComponent <MeshFilter>();
                if (mf != null)
                {
                    mesh = mf.sharedMesh;
                }
            }
            else if (renderer is SkinnedMeshRenderer)
            {
                mesh = (renderer as SkinnedMeshRenderer).sharedMesh;
            }
            return(mesh != null && InternalMeshUtil.HasNormals(mesh));
        }