For complete workflow compatibility, we recommend downloading the original file.The viewer version is intended only for use in the web viewer. In the original file, the following are fully preserved:✔ native scene structure✔ complete materials without reduction✔ correct PBR texture maps✔ correct object namesIf you are going to integrate the model into a project, select the Original format.Basic aluminium window for archviz. Lightmaps for Unreal Engine. Lightweight model.