A function for patches within each face
this gets some important information out of each patch
patches_per(patch_details, plyFile, minimum_faces = 3, minimum_area = 0)
patch_details | 
 information on each patch  | 
plyFile | 
 a stanford PLY file  | 
minimum_faces | 
 minimum number of faces in each counted patch  | 
minimum_area | 
 minimum area for a patch to be counted patches_per()  | 
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