Ok, so I've been trying to figure out how to create a 3D model of a highway that allows me to build elements at specific positions along an alignment. Most of my effort...and microelly2's effort... (Well,mostly just his effort) to this point has been focused on design tools for the alignment itself...
The issue I need to address is straightforward:
The highway model is built off of an alignment, which describes the general path of the roadway (and is usually the centerline of the road).
Everything that is constructed is located along the alignment at a "station", which is simply a dead measurement along the alignment itself from it's start to end. Thus, if something is located at Station 100+00, it's located (in imperial units), 10,000 feet from the start of the alignment - a station representing 100 feet.
Anyway, I need to be able to sweep sketches along portions of an alignment to build out the model. That means building a sweep tool that allows me to specify a starting and ending station / position along a spline, essentially. I can accomplish this somewhat with the split curve tool (I've worked that out in this thread, here):
but the method depends on creating a line segment for each piece of the model I need to build.
That can prove cumbersome, so it seems a tool or approach is needed that allows sweeping along a path with arbitrary starting and ending points. Thus, if the path is physically changed, the model isn't broken as the sweeps are positioned at positions along the path, and not the physical path itself (which can get regenerated).
Not sure where to proceed from here, but it seems this is a challenge that needs to be addressed.