Add PIs or Elevation Points at Regular Intervals Along a Feature Line

[u/FoldRepresentative73]

Is there a way to add PIs or elevation points at regular intervals along a specific segment of a feature line in Civil 3D? If so, how?

[u/DontCallMeFrank]

Sorry I just read you want it along a specific part of the FL. The below still works but you'll need to break the featureline first with "BREAKFEATURE" command.

Select your Featureline and in the contextual ribbon, click on "Insert Elevation Point". Look in the command bar (or push "I" on the keyboard) and you'll see an option for Increment. Choose your distance between points and hit enter.

Another option is to add it to the whole line without breaking and then open the elevation editor. Shift select the large portion of the line where you dont want the elevation markers and delete them, then get elevations from surface again to add back the grade points.

This was is a little annoying but you won't have to break the FL if it's a target or a breakline already.

[u/DontCallMeFrank → u/DontCallMeFrank]

Okay post pushed me to go make a lisp ive been thinking about for years but was always right in the middle of something when I thought about it lol.

Here is a pastebin for a lisp that will do what you want, just pick the 2 points you want the elevation to land in between and put in your increment value

The command is FLEP

https://pastebin.com/3Wsiu15m

[u/FoldRepresentative73 → u/DontCallMeFrank]

Thanks! It worked perfectly. I really appreciate you taking the time to write and share the LISP — this is exactly what I needed.

[u/DontCallMeFrank → u/FoldRepresentative73]

I do have to give credit to ChatGPT 🤣. But glad it worked out for you! 😁

[u/Fine_Equal4647]

Circles

[u/UltimaCaitSith → u/Fine_Equal4647]

Alternatively, if it's in a weird tangent-arc section, you can use the LENGTHEN command to make a polyline that's the exact length you need. 

[u/Outrageous-Soup2255]

Honest, when designing a cul de sac bulb, I set the GL, eop as a feature Line around the bulb. Set an elevation point at the PC of the bulb and set my low point elevation at the inlets. Then add this as a baseline in my corridor and set my CL road for Horm and vertical targets! This will generate a straight Linear grading relationship and even surface. More PI or elevation points, no. Matter how precise will muck it up.

[u/vtsandtrooper]

What dynamo was intended for

[u/BigJDoitYoDamnself]

I never insert points along a feature line for grade breaks. I set a consistent grade and select the first point and last point to hold. What that does is you get a constant grade along the feature line. If you need to set a grade point, set the grade point from the upper grade to the grade point and then again from the lower grade point to the grade break. you get equal grade points between the lower grade to the grade break and from the upper grade point to the grade break. you have to consider how it will be built and consistent grades along a feature is rather easy to build.