Issue:  Creating Final Surface & the Donut Hole

October 06, 2016 By Leo Lavayen Leave a comment

After a recent conversation with a longtime friend and Autodesk University Instructor, David Garrigues, I decided to post his interesting insight and content from one of his previous Autodesk University classes, on FG Corridor Surfaces.  The illustration below displays how pasting EG and FG to together to create a composite surface does not produce the expected or desired result.  These results are evident only upon creation of an entirely enclosed corridor, like in a Subdivision Layout, Pond, enclosed Berm or a moat.

Separate EG and FG surfaces

Desired Composite Paste



Tagged with Tech Support, Infrastructure, Surface, Civil 3D, PASTING SURFACES, akn_include

Creating a Civil 3D Surface from Text Data

October 02, 2014 By Leo Lavayen Leave a comment

I would like share an old Civil 3D tool that I recently used in a custom class, the command is called MOVETEXTTOELEVATION.

In the scenario presented, files are being provided from external sources and data in the drawing is only in 2D. That is the Contours, TIN lines and Points are ALL flat showing an elevation of zero (0.00).


  • Editing the TIN Lines: Too time consuming to edit each end point to the listed elevation.
  • Adjusting the contours lines: Possible, but too time consuming to edit individually.
  • Adjusting the point blocks “X” markers: Possible as well, too time consuming.
  • Elevating the Text to the elevation value: Quickest method, described here.

With this example, a few assumptions were made:


Tagged with Text Data, Tech Support, Infrastructure, Surface, Civil 3D, AutoCAD, AutoCAD Civil 3D

Creating Civil 3D Surface from Contours

September 24, 2014 By Leo Lavayen Leave a comment

The question on how to create surfaces from contours has come up lately and decided to create a write up. More than a how-to, I wanted to get into more details on the options when minimizing flat areas.

Surface from Contours

First, the contours MUST have elevations assigned to them. Typically files that come only have contour data provided have NO Civil 3D set up and styles. Optimally as the workflow should be to:

  1. Start by creating a new drawing using a Drawing Template that has a Civil 3D set up (preferably yours).
  2. Insert the drawing that has the contours and explode it.
  3. Create a new Civil 3D TIN surface (from Prospector or Ribbon).
  4. Set values in Create Surface dialog box.
  5. In Prospector, expand + the surface > expand + Definition
  6. Right click on Contours > select Add… > s
  7. Set values in Add Contour Data dialog box.
  8. Select Contours lines (preferably all other layers have been turn off)

Surfaces are great, as soon as x y z values are added, a surface is created.

Minimize Flat Areas Options

The above functionality has been part of the software for quite a long time now. What I wanted this post to add is more detail on #7 above, and show is the different surfaces created using the different combinations of the Minimize flat area options.


Tagged with Contours, Tech Support, Add Contour Data, Infrastructure, Surface, Civil 3D, AutoCAD, AutoCAD Civil 3D, Contour Data

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