If you want to split mesh search for mesh Iso splitting I put some script
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.grasshopper3d.com/m/discussion%3Fid%3D2985220%253ATopic%253A1761230&ved=2ahUKEwjGuLGw97_hAhUl5uAKHa2hAUIQFjAAegQIBBAB&usg=AOvVaw2HKlj3CHGEy7g7wMDiXocl&cshid=1554707218082
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