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facets is an option for convexHullFormat.

If facets→True then the return value of convexHull has the form

  {...
   facets→{{i11,i12,..},{i21,i22,..}
   ...}

where the k^th facet is formed by points {i_k1,i_k2,..}. Each i_kj is an integer representing the index of the point input to convexHull.

This option may only be requested for three-dimensional data.