Add polylines on 3D Tiles Sandcastle Example

[hpinkos]

Shows polylines on a BIM model:

And on Photogrammetry:

[cesium-concierge]

Thanks for the pull request @hpinkos!

• ✔️ 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.
• ❔ Unit tests were not updated.
  • Make sure you've updated tests to reflect your changes, added tests for any new code, and ran the code coverage tool.

Reviewers, don't forget to make sure that:

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

[pjcozzi]

• Please add to CHANGES.md
• BIM model looks great
• (1) are we sure about the photogrammetry model? The orignial request was to use a higher-resolution one to show the benefit when zoomed in close how the polyline is "pixel perfect." (2) if that is unrealistic, are we sure this is a good location for the line given the building's facade geometry?

[hpinkos]

@pjcozzi do you have a photogrammetry tileset in mind? This is the only one we have in other Sandcastle examples.

[pjcozzi]

No, I was hoping you or @ggetz could explore.

[hpinkos]

In the interest of getting this merged before the release, I removed the photogrammetry example. I'll open an issue to add something better for the next release.

[pjcozzi]

I removed the photogrammetry example. I'll open an issue to add something better for the next release.

I dunno, this seems like the most prominent use for this polyline feature. Why not just move the polyline on the current model and write an issue to create a higher quality example that shows the full value compared to the sub-sampling example that already exists?

[hpinkos]

@pjcozzi Something like this?

If not, please give me a better idea what you're looking for. Should I draw a line over the cars to better show that it follows contours? The polylines don't look good on foliage for the same reason you didn't like it on the side of the building.

[ggetz]

@hpinkos Perhaps along one of the flatter vertical sides of the buildings? Or zoom in on the roof and draw lines like you would be measuring equipment there?

[hpinkos]

@ggetz the problem with going along edges is you get lots of things like this because the walls of the building are wavy:

[hpinkos]

@ggetz ready

[ggetz]

Thanks @hpinkos!

Regarding

write an issue to create a higher quality example that shows the full value compared to the sub-sampling example that already exists?

Let's write an issue to include a higher quality photogrammetry model for sandcastle examples, and mention this example could benefit from using it, along with the sub-sampling example.

[hpinkos]

Done #7532

[ggetz]

Thank @hpinkos !

[ggetz]

Can you add a note to CHANGES.md? We did that with the model wheel animation sandcastle example this release.

[hpinkos]

Yep, sorry I missed that @ggetz
This is ready now

[ggetz]

Thanks again @hpinkos !