The issue: Some corridor surfaces overlap more than one surface - for example on my project the Ramp1 surface overlaps two adjacent ramp daylights for RW3 and the MainLine CL99, and the base surface. I tried creating corridor regions for each surface overlap but the corridor cannot have surfaces by region.
Is this correct: Composite volumes allows selecting only one base surface, therefore the volume cannot be calculated without creating a corridor within each region of individual surface overlap.
Granite7 said:
...but the corridor cannot have surfaces by region.
That's true, but if you're using daylight or another feature to automatically create the overall surface boundary, extract the boundary from that surface, draw plines at region points, break the pline that you extracted, join to make region boundaries, apply these as boundaries for the region surfaces.
Appreciate the advice
If the 3D model is used during construction then updates to reflect the actual conditions requires repeating your process. Another approach similar to what you suggest is to join the surfaces and then use the volumes dashboard to form the surface boundaries.
The solution I used is a "dummy corridor" to provide the comparison surface. The dummies are copies of the existing corridors but are formed into corridors A and B or cover the problem boundary region. This approach is dynamic to changes in the alignment or profile.
If there was a function to copy and paste a corridor it would have been simpler to create the dummies since I'd only needed to clear the associated payItems in code and change the stations. It was not much to create them from scratch.