Surface normal direction problem [Beijing water cube case]

Hello everyone!
I am trying to recreate the Beijing water pool. So, when I add boundary surface to Voronoi cells I noticed that some of these had wrong(interior) normals. It keeps me from properly inflation with kangaroo after that. Is there any method to analyze and flip wrong direction faces?

water-cube-problem.gh (12.3 KB)

Hi,
Check these so that you will get clear understanding of it


image credits: IAAC blog
Cheers,
BVR

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water-cube-problem_re.gh (11.3 KB)

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thanks, man! using a circle as guide soo neatly))