Sorry, I dont know how to use @somebody, Please?
Is it a really simple question?.
Can you details spec-compliant 3D tiles for me? I have used the format data of osgb, fbx, gltf, i3m and so on, it always make me confused about transfomation of 3d format data.I think for the development of cesium for unreal it will be a problem to to be solved, also.