Some enhancements for v0.4

[BatyLeo]

• precompute useful vertices in constructor
• optional bounding
• tests for threshold version

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.97%. Comparing base (240e576) to head (0d3b26d).
Report is 29 commits behind head on main.

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❗ There is a different number of reports uploaded between BASE (240e576) and HEAD (0d3b26d). Click for more details.

HEAD has 3 uploads less than BASE

Flag	BASE (240e576)	HEAD (0d3b26d)
	4	1

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
- Coverage   89.49%   81.97%   -7.53%     
==========================================
  Files           7        6       -1     
  Lines         438      233     -205     
==========================================
- Hits          392      191     -201     
+ Misses         46       42       -4     

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