ReGen Chunk in selfmade World

[xoft]

The WorldEdit plugin has a //copy and //paste commands that basically do what you want to do.
Simply put, you need to create a cBlockArea object, Read data into it (from within a cWorld:ChunkStay() to make sure the chunks are loaded) and then Write() it to the destination, again in a cWorld:ChunkStay(). Note that it's a bad idea to call a ChunkStay from another world's ChunkStay handler, because that could result in a deadlock. Use cWorld:QueueTask on the second world to avoid the deadlock.

local ba = cBlockArea()
srcWorld:ChunkStay(chunkCoords, nil,
  function()
    ba:Read(srcWorld, ...)
    dstWorld:QueueTask(
      function()
        ba:Write(dstWorld, ...)
        ba:Clear()
      end
    )
  end
)