HI - we have an alignment that has been designed with clothoid transitions. The client would prefer we use cubic parabolas - how can I change the spiral type? (In PRT it was easy in the horizontal editor)
The option is greyed out in the "Geometry Builder Edit"?
Any thoughts/assistance gratefully received!
Unfortunately, I don't see anything that could replace clothoid by cubic.
It is set in the Design Fil settings, Civil Formatting and store in the fillet properties but not visible. It means that you must delete the curve and create the curve so that new spiral type is used. I also tried using export-transform-import of XML but it didn't work.
One possible workflow is to create the traverse using a smartline, delete vertex of the complex (picking the curve) and insert vertex with same radius and transition length and snap the smartline. This is to try avoiding a drop of the horizontal to keep the profile. But no guarantee it will work all the time.
Or drop the horizontal to delete all curves with spiral and recreate the curves.
So make sure to do a copy of the horizontal+copy of vertical so that you can copy back the vertical in the new horizontal.
HI - yep, this is the conclusion my colleagues and I have come to too. I'd contemplated exporting the alignments to alg, editing the transitions in PRT and then re-importing them. The problem with any reconstruction of the alignment seems to be losing speed tables and cant design and the effect that has on modelled rails and any attached corridors. I guess the key is to really nail down your standards/CoP at the start of the project!
Hi Rob,
What I've found to work is if you create a new Spiral-Arc-Spiral element on the Complex Geometry child elements (after changing Spiral type) and use the Complex Redefine tool, you can swap elements with different spiral types.
Regards,
Mark
OpenRoads Designer 2023 | Microstation 2023.2 | ProjectWise 2023
Answer Verified By: jpln
You can simply go to your geometry table editor and copy the transition curve lengths in excel sheet for reference. After that you can make all the spiral curve lengths zero and click apply. Then after making suitable changes in the file settings you can again go to geometry table editor and fill in the transition curve lengths from your reference excel sheet. This is the quickest and most convenient method that I found. Simpler than reconstructing spirals.
Answer Verified By: Rob Barnes
Hi Malay Sameer Agarwal - thanks for this, definitely a better process than having to rebuild the spirals - works well, will save me a lot of hassle.
Cheers,Rob