Thank you.
In Houdini one can directly render the L-system as tubes or even as curves.
It is built in. But adding a Polywire node after the L-system is generated gives more control over the generation of a mesh/primitive.
I exported the generated mesh from Houdini as an *.fbx file, opened it in XSI and exported again as *.obj. The smoothness got lost.
Guess, i missed something.
Not sure if you know anything about L-Systems. I collected a few links and Python scripts available for Blender for you.
"Start Small Creating a Blender 2.6 Python add-on" is especially useful. But please don`t blame me if they do not work in the latest Blender
Might give you some hints for starters.
Cheers, Klaus