Fix/92 section distance 3d

[chrisbc]

WIP on #92

[codecov]

Codecov Report

❌ Patch coverage is 40.74074% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.83%. Comparing base (28a5bf7) to head (9e0892b).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
solvis/geometry.py	30.30%	23 Missing ⚠️
solvis/geojson.py	57.14%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #93      +/-   ##
==========================================
- Coverage   99.31%   96.83%   -2.49%     
==========================================
  Files          24       25       +1     
  Lines        1316     1358      +42     
  Branches       77       80       +3     
==========================================
+ Hits         1307     1315       +8     
- Misses          8       43      +35     
+ Partials        1        0       -1     

Flag	Coverage Δ
unittests	96.83% <40.74%> (-2.49%)	⬇️

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