Fix artifacts in BIM demo

[lilleyse]

Fixes #5722

Updates the tileset used in the BIM demo. Live Demo.

• No more line flicker artifacts
• Tried to remove as much z-fighting as possible
  • Ideally this would be fixed in the tileset rather than patched in the example.
• Updated glTFs so that the REPLACE blend mode works.
• Upgraded to glTF 2

Also adds hover-over picking to the demo. Because we don't have global batch ids there is a bit of boilerplate in there to get it to work.

I wanted to add silhouetting but I felt like there were too many artifacts. Example

To do:

• Don't use tileset out of my personal ion account
• Update other demos to use the new asset

[cesium-concierge]

Thanks for the pull request @lilleyse!

• ✔️ 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.

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[pjcozzi]

Also adds hover-over picking to the demo

Please make this a check box that defaults to false; it is too distracting for initial navigation.

[pjcozzi]

Tried to remove as much z-fighting as possible
Ideally this would be fixed in the tileset rather than patched in the example.

Where is the code doing the patching? I don't see it at glance.

[pjcozzi]

I wanted to add silhouetting but I felt like there were too many artifacts. Example

Not too bad but just depends on the view; agree to stay with just highlight for now.

[pjcozzi]

Also adds hover-over picking to the demo. Because we don't have global batch ids there is a bit of boilerplate in there to get it to work.

Not ideal but OK for now.

[pjcozzi]

Update CHANGES.md mainly to just build awareness of BIM in Cesium and per-feature selection.

[pjcozzi]

Thanks for upgrading this, bump when ready.

[lilleyse]

Where is the code doing the patching? I don't see it at glance.

Here and here

[lilleyse]

@pjcozzi Ready

[pjcozzi]

Here and here

ah, lol

[pjcozzi]

@lilleyse please submit a separate cleanup issue for this model so we can remove the workarounds. The workarounds are fine for demoing BIM / interiors, but not a useful code example.

[pjcozzi]

Should we move the near plane up?

[pjcozzi]

Minor, but show unchecking remove the highlight? Perhaps a good idea if it is only a line or code or two

[lilleyse]

Should we move the near plane up?

I believe that is a log-depth problem rather than the near plane being too far - #6573 (comment)

[lilleyse]

@pjcozzi Updated. Opened #7191 to address the z-fighting.

[pjcozzi]

Thanks!!!