code: def pack_rectangles(sizes: List[Tuple[int, int]]) -> PackedRectangles:
      """
      Naive rectangle packing in to a large rectangle. Flipping (i.e. rotating
      a rectangle by 90 degrees) is allowed.
  
      This is used to join several uv maps into a single scene, see
      TexturesUV.join_scene.
  
      Args:
          sizes: List of sizes of rectangles to pack
  
      Returns:
          total_size: size of total large rectangle
          rectangles: location for each of the input rectangles.
                      This includes whether they are flipped.
                      The is_first field is always True.
      """
  
      if len(sizes) < 2:
          raise ValueError("Cannot pack less than two boxes")
  
      queue = []
      for i, size in enumerate(sizes):
          if size[0] < size[1]:
              queue.append(
                  _UnplacedRectangle((size[1], size[0]), i, True)
              )
          else:
              queue.append(
                  _UnplacedRectangle((size[0], size[1]), i, False)
              )
      queue.sort()
      placed_so_far = [PackedRectangle(-1, -1, False, False)] * len(
          sizes
      )
  
      biggest = queue.pop()
      total_width, current_height = biggest.size
      placed_so_far[biggest.ind] = PackedRectangle(
          0, 0, biggest.flipped, True
      )
  
      second = queue.pop()
      placed_so_far[second.ind] = PackedRectangle(
          0, current_height, second.flipped, True
      )
      current_height += second.size[1]
      occupied = [biggest.size, (second.size[0], current_height)]
  
      for rect in reversed(queue):
          if _try_place_rectangle(rect, placed_so_far, occupied):
              continue
  
          rotated = _UnplacedRectangle(
              (rect.size[1], rect.size[0]), rect.ind, not rect.flipped
          )
          if _try_place_rectangle(rotated, placed_so_far, occupied):
              continue
  
          # rect wasn't placed in the current bounding box,
          # so we add extra space to fit it in.
          placed_so_far[rect.ind] = PackedRectangle(
              0, current_height, rect.flipped, True
          )
          current_height += rect.size[1]
          occupied.append((rect.size[0], current_height))
  
      return PackedRectangles(
          (total_width, current_height), placed_so_far
      )
  
file_path: pytorch3d/pytorch3d/renderer/mesh/utils.py
imports: from typing import List, NamedTuple, Tuple
  import torch
  from pytorch3d.ops import interpolate_face_attributes
label_desc: Use image node_id 4 for calling a global function with example usage: pack_rectangles(sizes) and returns: PackedRectangles