add save to 3dstreet json

[kfarr]

assumes json-utils.js functions are already accessible in global context imported from index.html script tags

still to do:

• change index.html to be same basic scene as 3dstreet core viewer -- also to include streetmix loader from # in url -- not working at present and will need to replace streetmix3d.net forwarding
• save this intersection scene in a different file, then convert later to .3dstreet.json so it can be loaded as an example
• test saving / loading -- loading doesn't work right now from the saved example file

[netlify]

✅ Deploy Preview for 3dstreet-editor-builds ready!

Name	Link
🔨 Latest commit	70cb7f0
🔍 Latest deploy log	https://app.netlify.com/sites/3dstreet-editor-builds/deploys/63d706ace8bb6b0009c3a020
😎 Deploy Preview	https://deploy-preview-79--3dstreet-editor-builds.netlify.app/
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site settings.

[omedvediev]

Hello, @kfarr, I'll check what is wrong with loading of the saved exmaple.

[kfarr]

I did a basic test last night and it seems to work. Next steps:

• resolve conflict with main branch - I will try this
• update json_utils in 3dstreet repo (here in 3dstreet-editor repo it is supposed to be just a copy) based on your new changes
• once released, ask users to test this out and break it to find edge cases

[kfarr]

Checklist to merge:

• backup original index.html as index-mapbox-intersection.html
• not doing - [ ] fetch json utils from 3dstreet repo - later
• test again
• not doing - [ ] add user warning or versioning - fast follow? - later

[kfarr]

things to do later:

• add user warning about brittleness of saving?
• ensure scene graph is re-loaded correctly upon load
• ensure parity of json utils with 3dstreet viewer repo
• add to docs
• once released, ask users to test this out and break it to find edge cases