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Description:

// MAP 2/14/2009
// EXPERIMENTAL
// Creates a new area based on an existing area.  The new area is loaded from
// disk (so created/destroyed contetns in the original area will not be duplicated)
// however the walkmesh is shared with the existing area to reduce
// lag during load time, as well as to keep memory consumption lower.

object CreateInstancedAreaFromSource(object oArea);

...

This function does have a few quirks and issues that need to be designed around, especially if you want to properly recycle areas and avoid memory leaks.

Overview:

• Each uniquely instanced area is loaded from disk preserving the original state of that area
  • Any changes to the area during run time, Created or Destroyed Objects will not follow to the instanced version.
  • Walkmesh is shared among each instance to reduce lag and lower memory usage
• Can only instance an area that is created in the toolset and has it's own .TRX / Walkmesh.
  
  • You cannot instance an instance of an area.
• Instances created can never be deleted (NWN2 has no way of deleting Areas or Freeing Memory)
• Everytime you create a unique instance of an area, the memory footprint in RAM will increase to allocate space for this instance, as a side effect -  all instances of a single area will be reallocated in RAM and their tags will be reset to the same as the base area.