Particle emitter

[nkoenig]

🎉 New feature

Summary

Adds <particle_emitter> as a child element of <link>. The values contained within the particle emitter come from the Ignition Gazebo Particle Emitter system.

Test it

This is part of a series of pull requests designed to support particle emitter in gz3d.
See also:

• Added particle_emitter vector message gz-msgs#149
• Particle emitter based on SDF gz-sim#730
• Support particle_emitters in the websocket server gz-launch#104

Checklist

• Signed all commits for DCO
• Added tests
• Added example and/or tutorial
• Updated documentation (as needed)
• Updated migration guide (as needed)
• Code check passed (In source directory, run sh tools/code_check.sh)
• 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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[chapulina]

Did you mean to target ign-gazebo4 (Dome)?

[iche033]

there are a few compile warnings on windows:
https://build.osrfoundation.org/job/sdformat-ci-pr_any-windows7-amd64/2049/msbuild/

[caguero]

I pushed very minor tweaks in 64ffdd2. It looks good to me besides the branch suggestion!

[nkoenig]

Did you mean to target ign-gazebo4 (Dome)?

Thanks, changed to the sdf10 branch.

[nkoenig]

there are a few compile warnings on windows:
https://build.osrfoundation.org/job/sdformat-ci-pr_any-windows7-amd64/2049/msbuild/

Fixed in 944e130,

[azeey]

I noticed that the <particle_emitter> tag was added to the 1.6 and 1.7 specs and not the 1.8. I would have expected it to be added to only 1.8 since old versions of libsdformat would not know about <particle_emitter>.

Edit: I thought this was targetting main/sdf11. It makes sense that it wasn't added to 1.8 in this PR.