Hi

I am currently looking to create a CityGML model of the buildings in a specific area using various spatial data. I have followed this tutorial Point Cloud to 3D Terrain Model with Buildings and obtained an Adobe 3D PDF model of the buildings

But I now want to convert this model into a CityGML LOD2 model. Is this possible?

Since I have just started using FME and am not very familiar with the software, what should my next steps be? Could you provide some useful references? 

Thanks for your advice