Entity Path not disappearing when entity is not available.

CesiumJS
1

1. A concise explanation of the problem you’re experiencing.

I’ve configured an Entity with a path that I want to only show based on my Availability settings that I’ve set.

2. A minimal code example. If you’ve found a bug, this helps us reproduce and repair it.

Here is a Sandcastle example. What I’ve done is added a second before and after in the Viewer relative to the actual availability settings. You will notice that the Point and Model items disappear but the Path does not.

I was able to fix this by simply adding:

entity.isAvailable(time)

to the list of conditionals inside of PathVisualizer.js on line 290. I don’t know what Cesium’s vision is for this but for my needs I need the path to disappear when the entity isn’t available.

3. Context. Why do you need to do this? We might know a better way to accomplish your goal.

If I have multiple Entity’s on the screen with their paths overlapping with time, I only want to show the paths that are currently active.

4. The Cesium version you’re using, your operating system and browser.

Cesium 1.58, Win10, Chrome v75.0.3770.142

2

Thanks for the Sandcastle example and the suggested fix! The closest issue I’ve found is this:

https://github.com/AnalyticalGraphicsInc/cesium/issues/1704

But it’s talking more about when availability data isn’t strictly available. I think in this case the correct behavior would be to have the path disappear if the Entity is not shown. I wonder if a cleaner approach would be to have the entity return that isShowing is false when isAvailable is false. I posted this question in that GitHub issue, feel free to follow up there. Making this contribution to CesiumJS once we have consensus would be absolutely appreciated!

3

Thanks for raising awareness of this in an actual issue. Good to hear I’m not alone in my thinking.

-Brad