This script exports the current rhino file to 3ds format, separating it by layer. It was intended for exporting it to ArchiCAD which can be inserted as GDL

export_to_ArchiCAD_3ds.py

# -*- coding: utf-8 -*-

import rhinoscriptsyntax as rs


documentName = '.'.join(rs.DocumentName().split('.')[:-1])
path =  '\\'.join(rs.DocumentPath().split('\\')[:-1])

print rs.LayerNames()

for layerName in rs.LayerNames():
    
    rs.UnselectAllObjects()

    obj = rs.ObjectsByLayer(layerName)
    if len(obj)==0:continue
    
    rs.SelectObjects(obj)
    #exportFilePath = '"'+path+'\\'+documentName+'_'+layerName+'.gsm'+'"'
    exportFilePath =  '"'+path+'\\'+documentName+'_'+layerName+'.3ds'+'"'
    
    rs.Command('!_-Export '+exportFilePath+' _Enter')