Specifications for coplanarity are here: http://www.ldraw.org/article/512.html#coplanar
Datheader tool detects and fix this (by splitting into triangles). BTW, it also find and correct bowties, but this may result in wrong winding.
By degenerated matrix I meant non-singular (determinant != 0). Also detected by Datheader.
Note also that some files may have been updated but are still on parts tracker, such as 2573 or 6035
Looks like some files appear twice in your list?
Datheader tool detects and fix this (by splitting into triangles). BTW, it also find and correct bowties, but this may result in wrong winding.
By degenerated matrix I meant non-singular (determinant != 0). Also detected by Datheader.
Note also that some files may have been updated but are still on parts tracker, such as 2573 or 6035
Looks like some files appear twice in your list?