can anybody suggest the best software to generate this type of line diagram?

(from: http://candelastructures.org/exhibit/name.html) [candelastructures.org]

Houdini?

Otherwise try openframeworks or processing

I would say all 3D softwares, but i think Houdini is simple and faster to setup the process and the rendering . C4D is a fast too with mograph or expresso but the toon shader is more difficult to setup to get a perfect line like this picture.

thanks for the relpy, guys!

I'd like to ask how to render a geometry with toon shader to get a graphic representation of the object with a thickened profile line?

cheers!