Vladimír Vondruš

In case you're wondering why no merge happened yet -- I wanted to take the [Viewer tutorial](https://doc.magnum.graphics/magnum/examples-viewer.html) and split the scenegraph-related stuff into a tutorial this example, as it's easier...

Merged as 818731dc280a4a782fb61ff36690aae621a4f910, thank you! I'll update the docs and everything tomorrow, too late to do that today. Keeping this open as a reminder until we solve the Closure Compiler...

Oh, and also enabling the example in all CIs, please :)

@Squareys I'd say this is all obsoleted by #86?

I commented because #86 has additional features the implementation in extras doesn't seem to have (loose octree, node allocation etc.) -- but OTOH the implementation in extras has tests, so...

Hi! I think I'm aware of this one, and I have a partial fix on some branch somewhere, but I wanted to improve the test coverage for this behavior and...

Some thoughts on this: - the `Ui::Plane` only purpose was to organize things for a correct back-to-front rendering, i never thought about anything else (until now!) - your proposal for...

> I think view projection matrix makes sense per UI. But there needs to be a per-Window transformation maybe. I don't know if different projections for different windows makes sense......

Yes, absolutely! :) Couldn't find this in the main imgui branch, so I suppose it's originating from this PR, right? https://github.com/ocornut/imgui/pull/3038 Can you add a bit of documentation, in a...

Apologies for cancelling the CI, I have *very little* free CircleCI credits left for June and saving them for emergency reasons :fire: If you can wait with pushing until July...