I have a featureline that I've assigned to a grading object. I have in the past used the Grade to Surface tool as well as Grade to Elevation.
But this case, I need to Grade to an elevation if I'm in cut or to my EG surface if I'm in Fill.
Is that possible?
EDIT: I don't think I worded that correctly. Here's a graphic that explains it better.
Don Ireland
Engineering Design Technician
Solved! Go to Solution.
Solved by doni49. Go to Solution.
No auto way to do this wit a grading. I would think you could do a conditional assembly on a corridor.
With a grading I would quickly target the surface and place a pline marker at cut/fill transitions. Delete the surface grading and redo it in one condition do the other in the other. 😉
John Mayo
Mark Green
Working on Civil 3D in Canada
@troma wrote:
Another idea would be to copy the target surface and edit it. Extract the contour at your target elevation, then delete all data above that elevation (or use the exclude option in the surface definition) and add the contours back in as breakline or contour data to the surface. Now you have one surface you can target.
Thanks. That worked with some tweaking.
I opened a new file and promoted my EG surface in (I've had trouble using the "exclude above elevation" option on a data ref'd surface).
Then I excluded everything above my target elevation. Then I drew a HUGE polyline around the outside of my surface well beyond the featureline. This polyline is also at the target elevation. I added this polyline to the surface as a breakline.
Now I have a surface for my grading object to target the desired elevation OR go to the lower elevation.
Don Ireland
Engineering Design Technician
Hmmm.
Upon closer inspection, I found that after I added my target elevation, it went back and grabbed the nearest points (even though they were excluded). But without adding the target elevation breakline, the grading object doesn't have anything to target if it's in one of those "above the target surface" elevation areas.
Don Ireland
Engineering Design Technician
I can't use a corridor for this so sub-assemblies won't help.
Don Ireland
Engineering Design Technician
Mark Green
Working on Civil 3D in Canada
Ok. Instead of using the "exclude above elevation" option or using the contour as a boundary, I used the "Crop Surface tool to crop it at the desired contour shape. Then I added my break line at the same elevation but beyond the feature line.
It worked out.
Thanks guys!
Don Ireland
Engineering Design Technician
Don sorry but not an answer/comment on your post but how do you get the image to attach to your message like that? I used to be able to do that but now must attach it as a file.
@randcdavidson wrote:
Don sorry but not an answer/comment on your post but how do you get the image to attach to your message like that? I used to be able to do that but now must attach it as a file.
Don Ireland
Engineering Design Technician
Good day...I have a similar case... I have a one layer of retaining wall to be built. The span on which the retaining wall to be built has a varying elevations. I needed it to be excavated first and fill some other parts in order to have a leveled elevation that is common to the span of the retaining wall (I needed it to be constructed on a flat surface). My question is how can I compute the said cut and fill materials for this? What procedure will I used? Do I need to use the Grading Procedure for this and can you guide me accordingly? I'm just new in Civil 3D . Hope I can have an answer for this.