>> Is it possible in AutoCAD Civil 3D 2012
>> If yes how?
Create a surface and add the 3DPolylines either as geometry or as breaklines, there for open the tree for the new surface in the projectbrowser and right-click "Breaklines" ==> "Add" and use the "Standard" breakline type then.
Good luck, - alfred -
First, contours are not 3D polylines, but normal 2D plines with elevation on the Z axis.
Second, in the surface definition, instead of adding "Breaklines" (as written by mein freund Alfred), you have to add "Contours".
for the triangulation it does not make a difference to add the 3D-polys as contours or as breaklines, except two additions:
It will make a difference withinin the options for cleaning options or options for point-additioning. So adding of contours and adding of breaklines are handled differently.
It may also make a difference when afterwards adding breaklines and therefor getting crossing breaklines.
Anyway, if there are 3DPoly's I always use the breaklines-option out of two reasons:
At least ... both options will work, and everyone has different practices of how to do.
- alfred -
There is a significant difference between adding polylines as breaklines vs. adding them as contours. The difference is the Minimize Flat Triangles option works best on elements added as contours. Thus if your polylines are truly contours (all vertices at one elevation) then you will likely benefit from the minimize flat triangles option so you will want to add them as contours, not breaklines.
See the help file for an explanation of the Minimize Flat Triangles option when adding contour data to a surface.
As far as I know, the only different between adding the lines as contours and adding them as breaklines lies in the dialog box options. When you add them as breaklines, you can choose to weed and suplement the lines. If you add them as contours, you don't get the option to do it or not, it will do it.
Also, when adding them as contours, you are immediately offered the option to minimize flat areas. If you add them as breaklines, you would have to add in the minimize flat areas edit yourself.
If I were adding multiple areas of contours to a surface, personally I would add them as breaklines so I don't get several minimize flat areas edits added to my surface.
As for the minimize flat areas settings, here is my take on how they should be done:
Are you sure the Minimize Triangle algorithms are applied to breaklines? The help file seems to imply they only apply to contours. If they are indeed applied to breaklines it would create problems with planar objects such as building pads. I would find that problematic.
The minimize flat areas doesn't work on contours or breaklines, it works on the surface. If the surface has flat areas, the minimize flat areas routine will minimize them.
Try it yourself (I just did). Create a surface from contours. Create a surface from contours but add them as breaklines and use the exact same weeding and suplementing factors. Then add a minimize flat areas edit to the breakline surface using the exact same settings as you did when you added contours. Do a volume comparison and you'll see a cut of 0 and a fill of 0 indicating they are exactly the same.
In other words, there is no difference between adding contours and adding breaklines other than adding contours requires weeding and suplementing factors and immediately allows you to add the minimize flat areas edit.
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