I am trying to meet a deadline (so i have to work superbowl sunday weekend) and here's what happened.
I graded a commercial site with mostly feature lines. I added points where I needed them to get everything to work. After modifying my surface, I suddenly have zero elevations randomly throughout my site. They don't make any sense why they appear. Some are just added to my drawing and others are existing points that were changed to zero. I can go to a back up drawing from a few hours ago and redo some grading, but I would like to know if there is a way to just erase zero elevations from the surface. I remember LDD was able to create surfaces ignoring elevations below a set elevation. Any help would be great.
Civil 3D 2013
I remember LDD was able to create surfaces ignoring elevations below a set elevation. Any help would be great.
Civil 3D 2013
C3D has this option as well in the Surface properties:
Being limited to a mixed 2D/3D environment is one of the banes of Autocad. Add to that the Site topology paradigm in C3D and we have the problems you describe.
What may have happened in your case is you have introduced some elements with zero elevation into your grading site. When you do that, any site objects that touch them will be pulled down to elevation zero at that point. You can set the surface model to ignore zero elevations but that may cause the surface to be inaccurate in those places. Ideally you'll want to correct the spikes.
Depending on the size of your surface, you may be able to view the surface from the side. Doing this will pull the zero tin lines way down. You can then use the "edit Surface Point" to delete the surface points at the end of the lines. That will take the points out permanently without leaving a hole in your surface. IF you delete the tin lines, you may wind up with a hole in the surface.