Useful FME workbenches
Convert land use shapefile to Cesium
Landuse shapefile to Cesium is a direct conversion without any transformer. Add your landuse shapefile as reader and choose 3D tiles as writer. Connect the port of shapefile reader to 3D tiles writer. In the writer properties make sure to select automatic in the user attribute to get all the attributes from the shapefile. Incase you only want some attributes from shapefile, select manual attributes and add or remove as required.
An example workbench is available here.