I have joined in the form of an "new Cesium.Primitive",now How do I add billboards?

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

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

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

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

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Hello,

Here’s an example of adding billboards. You can also add the billboard to a BillboardCollection for better performance.

Thanks,

Gabby