A little late to this discussion but extremely helpful - Trevor over at Quotidien has implemented essentially a curveboolean tool that uses half-edge mesh data structures:

All is revealed here: http://codequotidien.wordpress.com/2012/08/15/half-edge-mesh-2/

Further posts look at offsets, depth-distance (a la space-syntax) and the straight-skeleton for any half-edge mesh. In all excellent work, and very commendable.

4 years later : the same fellow.

I am really struggling to create boundaries based on sets of curves.

Rhino's Curve Boolean really sould be implemented in Grasshopper :

The "Surface split" component would just need extra inputs :

-Points to select regions

-A boolean to choose whether the selected regions should be merged or not.

Determining the useful points to select the proper region seems very easy compared to the trouble I have to go through presently to extract the boundary I want from the fragments resulting from "Surface split".

Has anyone found a more simple way to generate complex boundaries from curves ?

Cheers,

hey guy.. nice job

Im interesting to try this app 

but  i need the password.. waht can i do to get this?

thanks!!!