Scene view component

[fabian0702]

This PR contains the newly created ui.scene_view element as discussed in PR #2608. This would allow to have multiple cameras for the same scene, but from multiple perspectives at the same time.

[falkoschindler]

Hi @fabian0702, thanks again for pushing this new feature forward!

There are still some issue though:

1. Text renderers don't seem to work. Adding something like scene.text('Hello, world!') or scene.text3d('Hello, world!') to a ui.scene causes rapid flickering when a ui.scene_view is shown on the same page.
2. Both pytests are currently failing.
3. I added camera parameters to ui.scene on main, which we should add to ui.scene_view before merging. But this shouldn't be too hard to integrate.

Can you, please, have another look into it? Thanks!

[fabian0702]

@falkoschindler I fixed the problems you mentioned and added the necessary camera parameters. Unfortunately I had to remove the text renderer from the scene_view component due to the way text is currently rendered.

[falkoschindler]

Great! I think this feature is ready to merge. Thanks again, @fabian0702!

Regarding the text renders: It looks like they can't handle rendering a scene into another div. So I removed them altogether and added a note about this limitation to the documentation of ui.scene_view.

And I think I found a simpler way to wait for the parent scene. Awaiting this.$nextTick() seems to work well in all automated and manual tests. What do you think?

[fabian0702]

@falkoschindler I'm all for simplifying the code. The rest of the changes look good to me, thank you for the improvements.