It's possible to set the CallbackProperty to a bool variable? ?

[ccci]

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

Currently, I need to create lots of polygons and set the default "show" to false. When certain conditions met, the "show" could change to true. I understand how to use Callback property to set dynamic positions, but I am not sure if it works for bool. I don't know if there other way to achieve this. Thanks for helping me. 

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

var tf = new Cesium.CallbackProperty(function(){

    if (value>10)

      return true;

    }

    else

      return false;

}, false);

 let entity_example=new Cesium.Entity();

    entity_example.polygon={

        hierarchy: new Cesium.PolygonHierarchy(poss),

        material: Cesium.Color.RED.withAlpha(0.5),

        heightReference : Cesium.HeightReference.CLAMP_TO_GROUND,

        show: tf

      }

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

I need to control entity visibility dynamically after I create the entity.

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

Windows, Chrome

[Omar Shehata]

I think you should be able to just set show = true/false as needed. 

So if you need to do it based on polling some condition like that, you could check every frame for it. Does that work?

[Jingdi Zhang]

Thanks! Nothing changes when I try to track the bool value. I decide to use callback property for position to control show/hide.

[ccci]

Thanks! Nothing changes when I try to track the bool value. I decide to use callback property for position to control show/hide.