Select Alternating Polygons?

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  1 Day Ago
the mesh originally has duplicated faces because of probably "double-side" export feature, as Klvnk pointed...
but "checker - order" duplication might be a specific coincidence.

here is a more universal solution:

fn fixWeirdMesh obj =
(
   hash_faces = for k=1 to obj.numfaces collect
   (
      x = (length (meshop.getfacecenter obj k) * 100) as integer
      y = (meshop.getfacearea obj k * 100) as integer

      [x,y]
   )

   hash_unique = makeuniquearray hash_faces
   unique_faces = for i in hash_unique collect (finditem hash_faces i)


   meshop.deletefaces obj unique_faces
   meshop.weldVertsByThreshold obj #all 0.0001
   meshop.unifyNormals obj #all
   meshop.autoSmooth obj #all 45
   update obj
)
/*
fixWeirdMesh $
*/


it might need a code optimization, more accurate hashing, and a parameter tweaking...
 
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