View Full Version : Grading between 2 featurelines
If I want to make a grading from a featureline at one elevation to grade 1:3 to a featureline at anoter elevation, is that possible?
2009-11-05, 01:29 PM
Your description is a little misleading. What exactly are you trying do? Do you have both feature lines and you are just trying to set the elevation of on relative to the other? Are you trying to create a new breakline? Do you have both breaklines at elevation and are trying to simply get data between them?
The answer to your question, most likely, is yes. But, how to do it? That requires more information from you.
I will try to explaine. I have some points from a paper drawing (inside a small lake), that I put into my civil3d drawing with N,E,Z. Between thise points I make a closed featureline. From this line I would like to make a grading 1:3 to connect to the feature line that is the outer circle of the lake.
2009-11-19, 04:59 PM
If the two featurelines both have elevation, then could add them both to a surface as breaklines and you would have "graded" between them.
If instead you want to grade from the inside line 3:1 using the outside line as a limit, that is a little different. Here is one way:
1. make the inside line into a grading feature line
2. make a grading at 3:1 "by distance" where the distance is larger than the delta to your outside line. This will form a "cone" shaped surface
3. make the outside line into a feature line on a different site (the different site is important)
4. edit elevation on the outside line using the new cone surface as the target
5. Apply the outside line to the cone surface as a outside border
6. grade from the outside line down to the existing surface.
7. turn off the grading object so that you don't see the cone
Using this I was able to make a nice little pond in just a few minutes.
2009-11-19, 06:33 PM
Or, even better, use the Adjacent Elevations by Reference command.
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