docs: static private Vector3f[] copyVertices(Vector3f[] vertices) {
          if (vertices == null) {
              return null;
          }
          Vector3f[] copy = new Vector3f[vertices.length];
          for (int i = 0; i < vertices.length; ++i) {
              copy[i] = new Vector3f(vertices[i]);
          }
          return copy;
      }