Better mouse controls for untracking entity

[SkinnyRat]

Before double-clicking on a GLTF object or similar, the controls are:
Left-click => Pan
Scroll-click => Rotate

After double-clicking, the controls get changed to:
Left-click => Rotate
Scroll-click => Disabled

Cesium version: 1.39
To replicate: Visit the sandcastle & double-click on the truck.
https://cesiumjs.org/Cesium/Build/Apps/Sandcastle/index.html?src=Physically-Based%20Materials.html&label=Showcases

My system: FireFox 54.0 (64-bit) on Ubuntu 16.04

Thanks!

[ggetz]

Hi @SkinnyRat, thanks for the report!

Setting viewer.trackEntity = undefined restores the controls, so I assume the gltf object is still be tracked after clicking away. Is that intended behavior?

[hpinkos]

@SkinnyRat The behavior you're seeing is intended, but I agree that we can probably improve this interaction. As far as I know, clicking the home button is the best way to un-track an entity after you double click it. Maybe we can remove the tracked entity when you double click away from it.

In the meantime, if you want to disable the double click behavior, you can do so with this line:
viewer.screenSpaceEventHandler.removeInputAction(Cesium.ScreenSpaceEventType.LEFT_DOUBLE_CLICK);

[shunter]

The top-left button on the info box also un-tracks a tracked entity.

[SkinnyRat]

Ah I see... disabling double-clicks works for me.
Thanks!

[OmarShehata]

@hpinkos should this be re-opened? It's pretty unintuitive as it is right now. I also thought it was a bug, and it came up on the forum again here:

https://groups.google.com/d/msg/cesium-dev/EIRyiQR5_fY/WENhsMl5AgAJ

[hpinkos]

I think double clicking off of the entity would be an intuitive way to unset the tracked entity. @mramato @emackey what do you think?

[GatorScott]

double-click might be better since the user won't have to know what's not clickable, especially for new users of an application. e.g. Double-clicking the sky box or the globe might give coordinates of the clicked location.

[hpinkos]

right, and they have to double click the entity right now to track it, so double clicking away from it seems like a natural choice

[cesium-concierge]

Congratulations on closing the issue! I found these Cesium forum links in the comments above:

https://groups.google.com/d/msg/cesium-dev/EIRyiQR5_fY/WENhsMl5AgAJ

If this issue affects any of these threads, please post a comment like the following:

The issue at #5959 has just been closed and may resolve your issue. Look for the change in the next stable release of Cesium or get it now in the master branch on GitHub https://github.com/AnalyticalGraphicsInc/cesium.

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