def perform(level, box, options):
fillBlock = options["Fill"]
withBlock = options["With"]
borderThickness = options["Boundary thickness"]
orig = MCSchematic(shape=box.size, mats=level.materials)
orig.copyBlocksFrom(level, box, (0,0,0))
orig.removeEntitiesInBox(orig.bounds)
orig.removeTileEntitiesInBox(orig.bounds)
a = orig.Blocks[:] != fillBlock.ID
b = numpy.copy(a)
for n in xrange(borderThickness):
b[:] = a[:]
b[ 1: , : , : ] |= a[ :-1, : , : ]
b[ :-1, : , : ] |= a[ 1: , : , : ]
b[ : , 1: , : ] |= a[ : , :-1, : ]
b[ : , :-1, : ] |= a[ : , 1: , : ]
b[ : , : , 1: ] |= a[ : , : , :-1]
b[ : , : , :-1] |= a[ : , : , 1: ]
a, b = b, a
orig.Blocks[~a] = withBlock.ID
level.copyBlocksFrom(orig, orig.bounds, box.origin, [withBlock.ID])
level.markDirtyBox(box)
