Support for particle system scaling/sizing in world space

[richard3d]

Allows particle system billboards to be sized in world space via sizeInMeters property that was added and cascaded to billboards during update/creation process.

[cesium-concierge]

Thanks for the pull request @richard3d!

• ✔️ Signed CLA found.
• ❔ CHANGES.md was not updated.
  • If this change updates the public API in any way, please add a bullet point to CHANGES.md.

Reviewers, don't forget to make sure that:

• Cesium Viewer works.
• Works in 2D/CV.
• Works (or fails gracefully) in IE11.

[hpinkos]

Thanks for the PR @richard3d! We'll try to look at this in the next week or so

[richard3d]

Yikes! I just pushed a change to fix the merge conflict with CONTRIBUTORS.md can someone advise why my latest push caused AppVeyor to fail @hpinkos ? I would really like to get this PR in :)

[cesium-concierge]

Thanks again for your contribution @richard3d!

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[cesium-concierge]

Thanks again for your contribution @richard3d!

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[cesium-concierge]

Thanks again for your contribution @richard3d!

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[OmarShehata]

@richard3d the AppVeyor failure may have been a fluke. I would try resolving the merge conflict, merge in master and it'll re-run the CI.

[cesium-concierge]

Thanks again for your contribution @richard3d!

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[hpinkos]

@lilleyse can you review this?

[lilleyse]

@richard3d does Merijn Wijngaard also work at Prominent Edge and is he covered by your CLA? Could you add Merijn and yourself to the Corporate CLA section?

[lilleyse]

I pushed a few small tweaks in e190735.

I'm noticing some strange behavior in one of the Sandcastle examples that uses particle bursts. sizeInMeters seems to be exposing some other bug where the particle bursts fill the whole screen. Local sandcastle

[lilleyse]

@richard3d does Merijn Wijngaard also work at Prominent Edge and is he covered by your CLA? Could you add Merijn and yourself to the Corporate CLA section?

Never mind, I think Merijn was accidentally added twice to CONTRIBUTORS.md. I've made the correction.

[cesium-concierge]

Thanks again for your contribution @richard3d!

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[cesium-concierge]

Thanks again for your contribution @richard3d!

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[cesium-concierge]

Thanks again for your contribution @richard3d!

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[cesium-concierge]

Thanks again for your contribution @richard3d!

No one has commented on this pull request in 30 days. Maintainers, can you review, merge or close to keep things tidy?

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[hpinkos]

@richard3d can you address the comments from the review? #7746 (comment)

[hpinkos]

@lilleyse @criyson opened the same change as this in #8603. Do you think we can get this one merged, or is the weirdness you saw when testing a showstopper?

[lilleyse]

Do you think we can get this one merged, or is the weirdness you saw when testing a showstopper?

Whatever this was, I don't see it anymore. My theory is it was one of those bugs where hidden points/billboard would either take up the whole screen or stay in the center of the screen that we fixed.

[lilleyse]

I updated CHANGES.md 53400d8. Good to merge whenever CI passes.

[hpinkos]

Thanks @lilleyse!

And thanks @richard3d and @criyson!