What kind of tree, sir: an oak, a redwood, or..?
Hi,
in generally you can construct nearlly any 3D tree.
Fits is the question using mesh or solid?
Inside AutoCAD (not Map 3D) you will find a workbench named 3D.
All commands are also inside Map 3D, but the cuix file doesn't contain it.
There you will find everything you need to design.
But be carefull, if you want to use the tree multiple in a drawing then make not too much Details.
Thorsten
Google this AutoCAD 3d tree dwg free download
find one that is suitable
or search the forums; has been asked before
http://forums.autodesk.com/t5/autocad-2004-2005-2006/free-3d-trees/td-p/2803706
no sense to work too hard 🙂