Improve GetInnerVertex() by querying local fragment only

[songqing]

What do these changes do?

The current implementation of GetInnerVertex() is to query all the fragment, it's not needed as we only need the inner vertex

[codecov-commenter]

Codecov Report

Merging #2772 (cf75abd) into main (bf8d7b0) will increase coverage by 26.70%.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2772       +/-   ##
===========================================
+ Coverage   41.39%   68.10%   +26.70%     
===========================================
  Files          99       99               
  Lines       10381    10392       +11     
===========================================
+ Hits         4297     7077     +2780     
+ Misses       6084     3315     -2769     

see 61 files with indirect coverage changes

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