Add Focussed Detector In 3D Example

[faridyagubbayli]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.43%. Comparing base (18843be) to head (5f81d09).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #495   +/-   ##
=======================================
  Coverage   72.43%   72.43%           
=======================================
  Files          46       46           
  Lines        6745     6745           
  Branches     1301     1301           
=======================================
  Hits         4886     4886           
  Misses       1303     1303           
  Partials      556      556           

Flag	Coverage Δ
3.10	72.66% <ø> (ø)
3.11	72.66% <ø> (ø)
3.12	72.66% <ø> (ø)
3.9	72.43% <ø> (ø)
macos-latest	72.43% <ø> (ø)
ubuntu-latest	72.43% <ø> (ø)
windows-latest	72.43% <ø> (ø)

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[waltsims]

LGTM!