DstivjTS

void UpdatePivot(GameObject obj)


    {
        Mesh mesh = obj.GetComponent<MeshFilter>().mesh;
        Vector3[] verts= mesh.vertices;
         Vector3 p = new Vector3(verts[0].x+verts[1].x+verts[2].x)/3f, verts[0].y+verts[1].y+verts[2].y)/3f, verts[0].z+verts[1].z+verts[2].z)/3f);
        obj.transform.position = p; 
        for (int i = 0; i < verts.Length; i++)
        {
            verts[i] -= p;
        }
        mesh.vertices = verts; 
        mesh.RecalculateBounds(); 
    }