edit edge of grading area

[Anonymous]

Hi all,

need advice.. i need to calculate volume for sandkey to existing seabed

first image is my grading plan in civil using grade to surface slope 2:1

but in reality the edge of grading not possible during construction in deep sea (for reclamation project)

any advice how I can make grading with each corner like my third pic? 

thanks

damayanti

[joantopo]

Yes, civil 3D doesn't have this setting but PoweInroads has in the gradings.

I recommend adding this post in IdeaStstion because nobody has already done.

http://forums.autodesk.com/t5/autocad-civil-3d-ideastation/idb-p/31/tab/most-recent

[Pointdump]

NR,

Can you post your drawing? I have an idea, but I'd like to see if it works first.

Dave

[Neilw_05]

I think I understand your problem. What you are wanting is mitered corners in your grading. Civil 3D gradings cannot model mitered corners. You will have to manually draw in the corners with featurelines. You can use the gradings as a guide to lay out the geometry for the corners.

If you have access to C3D 2017 you can now use corridors from featurelines and the corridors will now automatcially clean up mitered corners. See the video provided in help system under new features for grading with corridors.

[joantopo]

Clean up is just for fiexed width, in this case is not valid for daylight with surface target.



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[autoMick · Accepted solution]

To elaborate on Neil's response...

Use your existing grading to determine what your total footprint is.

Now draw a rectangle/polygon around the footprint (i.e. with square corners) and use that to grade back up to your fill elevation. During the grading process when you converting the rectangle to a featureline, you will be able to assign the elevations of the rectangle edges from the existing surface. Use a reasonable spacing of intermediate points to make sure the rectanglar feature line hugs the surface well (if needed). Note that the top of the grading won't be a nice rectangle. So....

Alternatively (the way I'd do it - and very similar to your right hand image)

1. draw the top rectangular boundary and assign its elevation

2. draw the bottom rectangular boundary, convert to a featureline and assign elevation from the existing surface as described above.

3. draw connecting 3dpolylines between the upper and lower rectangles for each corner (snapping to the elevations of those corners)

4. Add all these objects to a surface as breaklines

5. Swap edges on some of the surface triangles at the corners to get a consistent result if required.

See screencast below

Cheers

- Mick

[Anonymous]

Thanks @Neilw_05 .I tried to upgrade my civil 3d but in website the set up file still showing 2016 version>> Autodesk_AutoCAD_Civil_3D_2016_Win_64bit_WI_en-us_Setup_webinstall.exe 

is the same set up for the 2017 version?

I'm wondering to try grading to corridor..

Thanks @autoMick i would try following your steps. And the video really help ^^

Thanks all for your help

Damayanti