Volume Opacity Control

[AoGao-Kedoka]

Describe your changes

Update opacity control for the volume rendering

Opacity file to test (gaussian curve):

Issue ticket number and link if any

#2052

Checklist for finalizing the PR

• I have performed a self-review of my code
• I have added tests for new features and bugfixes
• I have added documentation for new features
• If it is a modifying the libf3d API, I have updated bindings
• If it is a modifying the .github/workflows/versions.json, I have updated docker_timestamp

Continuous integration

Please write a comment to run CI, eg: \ci fast.
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[github-actions]

You are modifying libf3d public API! ⚠️Please update bindings accordingly⚠️!
You can find them in their respective directories: python, java, webassembly.

[AoGao-Kedoka]

\ci fast

[AoGao-Kedoka]

tests and documentation will be added later.

[AoGao-Kedoka]

@mwestphal Hi, this is ready for review

[mwestphal]

small changes

[mwestphal]

changes needed

[mwestphal]

flag related changes

please add tests and docs

CI is red :)

[mwestphal]

Please rebase on master to fix website CI

[AoGao-Kedoka]

\ci full

[codecov]

Codecov Report

❌ Patch coverage is 90.47619% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.65%. Comparing base (9b0865f) to head (e3323d3).

Files with missing lines	Patch %	Lines
vtkext/private/module/vtkF3DRenderer.cxx	87.09%	4 Missing ⚠️
application/F3DStarter.cxx	80.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2693      +/-   ##
==========================================
- Coverage   96.67%   96.65%   -0.02%     
==========================================
  Files         142      142              
  Lines       12833    12874      +41     
==========================================
+ Hits        12406    12444      +38     
- Misses        427      430       +3     

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