In a GroundPrimitive, how to get geometry instance on click event?

CesiumJS
1

I want get a polygon geometry instance in a ground primitive when I click on the polygon.
Here is the sandcastle url: GroundPrimitive click event.

2

Hi,

You can not, because Primitives does not store geometry instances.

3

If you’re the one creating the primitives then you have the data, so you can recreate parts of it. I would create a table of configs for your entities (or make it queriable through a db) and create those. Here’s a crude (very crude; don’t put the config into the id, but rather create a lookup-table of id’s → config, but you get the idea) that allows you to do a reverse lookup when you pick on those primitives;

Cheers,

Alex

4

Hi Alex, thanks for your reply! I can get id from click event. But when there are too many polygon geometry instances, the click event returns the wrong instance id. I don`t konw why. So I seperate the instances into different GroundPrimitive, which returns the right geometry while has bad performance. But this actually solves my problem. Thanks anyway! :grinning: