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I was recently certified by Autodesk as a Civil 3D Implementation Certified Expert or ICE. I have worked in the Civil Engineering industry since 1987. In 1994 I started my consulting business doing training and consulting for Civil Engineering customers utilizing Autodesk civil engineering technology. I started L.A. CAD in 1999 and we are currently the 3rd largest Autodesk partner in the U.S. Studied Civil Engineering at Long Beach State, graduated in 1996.

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Digging In...

Friday, October 20, 2006


Dynamic Grading w/ Feature Lines

As you can see by the below screen capture, it is fairly obvious that the back of the lots may be higher than the pad elevations when you look at the contours. The reason for this is the finished floors have not been added yet. The lot to lot slopes are a 2 to 1 slope between the lots which are dictating the surface right now. The lot to lot slopes also are a 1% positive grade from the front to back of lot.

The pads themselves have already been turned from polylines into feature lines. The pad elevations have been automatically assigned by extracting elevations from a surface when the lots were flat (before the 1% grade was applied from front to back). This was done purposefully in order to keep the pads flat. Now we will use the Feature line editing tools to set a logical increment to bump the pads up.

On the Feature Line Toolbar in Civil 3D, we will select the elevation editor followed by picking the far left pad. Once the pad is selected, we will see the Panorama for the Elevation Editor. By selecting the Set Increment button, we can set the increment to 0.5

Then in the elevation Editor, we will use the Raise Inrementally button to raise the pads by 0.5

Provided you have your surface for the PADS set to Automatically Rebuild, you will see the contours for the PADS surface automatically re-display as you add the Finished Floor elevations. The labels for the finished floor also update automatically.

You can use the Select feature line or parcel line tool in the elevation editor to jump to a different pad...

In a matter of a few seconds for these 4 lots, you can incrementally raise the finished floor above the finished ground, and again, the labels update as well...

Posted by DannyCounts @ 6:23 AM


Posted by Blogger Dana Breig Probert, EIT : 5:30 PM
Awesome Danny, Thanks!

hey do you have a feed? I can't find it...

Posted by Blogger DannyCounts : 8:17 PM
Thanks, Dana!

I do not have a feed; I need to figure out how.

Posted by Anonymous Anonymous : 12:08 PM
I am trying to determine the mass cut and fill volume for a building site, comparing the existing surface to the sub grade surface. I an starting with a flat CAD drawing, which shows the edge of asphalt, curb, sidewalk, building location, etc. I have converted the 2d polylines into feature lines and applied elevations and slope along sections of them. When I try to build a surface from these feature lines the tin model does not hug or stick to the curved section of the feature lines, Normally in Land I would have added vertices along the 3d polyline, is there a place to do this in Civil with feature lines? This way my surface model will look correct and smooth in the corners.

Posted by Blogger DannyCounts : 12:29 PM
I am sorry, it appears there is no way to add additional vertices in Civil 3d. There is a way to weed vertices, so not sure why they didn't add this.

Vertices get added to a feature line when you use the "Elevations from Surface" feature.

Posted by Anonymous Anonymous : 11:53 AM
Danny, Is is possible to show us how to do grading with a building pad that has a walkout at the back? I've played with various ways and would like to see your way.

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