Hi @VisionsMind
AFAIK, there is no way to automaticaly create impostor when loading a scene (.gltf/.babylon/…).
I’ve found a thread and a playground that illustrate creating impostor for a scene.
Basically, impostor type is created based on mesh name. ( check lines 226 to 232)
glTF & Basic Physics | Babylon.js Playground (babylonjs.com)
And related thread : glTF & Basic Physics - Questions - Babylon.js (babylonjs.com)