Set per-point color on markers

[chapulina]

🎉 New feature

Part of

• Generic point cloud visualization gz-sim#1156

Requires

• Per-point colors in point clouds gz-rendering#494
• Marker: support different colors per point gz-msgs#202

Builds on top of

• Set marker point size from message #317
• Don't set visual scale for point markers #321

Summary

If a message specifies multiple colors, use different colors for each point. Otherwise, fallback to current behaviour.

The branch is currently on ign-gui6 while I work on the implementation, but the goal is to merge this into main after gazebo-tooling/release-tools#554.

Test it

Run the marker example and see that both the single material and the per-point material work:

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• codecheck passed (See contributing)
• All tests passed (See test coverage)
• While waiting for a review on your PR, please help review another open pull request to support the maintainers

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[iche033]

hmm not sure what's changed, the points look like they are more spread out? I'm now testing with all Garden branches

[iche033]

oh I think it just needs #321 to be ported forward

[caguero]

Works for me as expected.

[codecov]

Codecov Report

Merging #318 (26125a8) into main (4b3ca69) will decrease coverage by 0.11%.
The diff coverage is 25.00%.

@@            Coverage Diff             @@
##             main     #318      +/-   ##
==========================================
- Coverage   65.74%   65.62%   -0.12%     
==========================================
  Files          34       34              
  Lines        4752     4751       -1     
==========================================
- Hits         3124     3118       -6     
- Misses       1628     1633       +5     

Impacted Files	Coverage Δ
src/plugins/marker_manager/MarkerManager.cc	59.45% <25.00%> (-1.15%)	⬇️
src/plugins/scene3d/Scene3D.cc	48.83% <0.00%> (-0.26%)	⬇️

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