docs: public int[][] getFaces(int indexFlags) {
          int[][] allFaces = new int[faces.size()][];
          int k = 0;
          for (Iterator it = faces.iterator(); it.hasNext();) {
              Face face = (Face) it.next();
              allFaces[k] = new int[face.numVertices()];
              getFaceIndices(allFaces[k], face, indexFlags);
              k++;
          }
          return allFaces;
      }