Export from Poser as 3ds and import into Autocad is one thing that I do. You also might want to try the export VRML to redude the poly count and then convert the VRML to 3ds or Back to OBJ. 3Dsmax has a lot of import export filters, Vrml, stero lith, 3ds obj etc. Most of the Engineering softwares can export Stero Lith. most can read DXF files. Try export from poser as DXF Hope this helps.