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
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
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 