Avoid NaN normals for degenerate triangles

[svchb]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.90%. Comparing base (d205497) to head (c382bce).
⚠️ Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1191      +/-   ##
==========================================
+ Coverage   89.05%   89.90%   +0.85%     
==========================================
  Files         128      133       +5     
  Lines       10039    10454     +415     
==========================================
+ Hits         8940     9399     +459     
+ Misses       1099     1055      -44     

Flag	Coverage Δ
total	89.90% <100.00%> (+0.85%)	⬆️
unit	70.51% <100.00%> (+2.40%)	⬆️

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