probably related to this thread : billboardMode on a gltf assets doesn't works as it should
Well your playground seems correct to me. The plane is correctly rendered as billboard
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The plane must be in the same place as the sphere, like when bollboardMode is 0 
Oh ok…so this is a constraint of billboards when they have a parent. They cannot inherit from parent rotation unfortunately
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Hi @Zuzukidze, you’ve probably already found a solution, but this might help others later on. I was trying to do something similar today and found a solution by computing a new position for the billboard separately in registerBeforeRender,
Hi @Eric, thanks for your solution, but I decided to go without billboards 