Three.js doesn convert groups from Sketchup


I am currently converting a native Sketchup file into a three js object. This works fine, but the converted part does not recognize the actual groups that have been created in the Sketchup file.

For targetting it seems that for one object (as the parent) Three JS does not give the option to target the children groups.

When I am drawing a simple village layout with rough cubic forms (in one Sketchup object) I want to be able to give every object a groupname and later on, target them seperately in the three js file.

Could someone please help!
Thank you…