There's a thread here that poses the exact questions I need help with, but it was ignored at the time. Basically, I am trying to make a system of roads based on splines. These will be generated by the user at runtime, so all of the generation needs to be done dynamically and on the fly. I can create the curve and create an extruded mesh based on that, but I can only get as far as the rectangluar shape. Basically this means plopping vertices at offsets along the curve and triangulating it. This is simple enough, but I have absolutely no idea where to begin thinking about how to create an intersection, specifically in creating the geometry for it. Think SimCity.
For example this video. It uses Houdini to create the mesh beforehand, but what I basically need help with is the most basic theory behind how Houdini does what it does in this particular case.
I apologize for the lack of detail in this question. I am just lost regarding how best to proceed from here. Thank you.