When I try to add extra tin lines manually, I get the error message that my new line crossed a breakline at .........., and does not add my new line....but there aren't any breaklines defined in my surface.
I guess I could adjust the settings to 'allow crossing breaklines' but I don't know how that will affect my surface.
Any suggestions ?
Garry
Solved! Go to Solution.
Solved by gk. Go to Solution.
If you are buidling your surface from contours and edges of rodways with elevation etc, you get the crossing breakline issue. the contours cross the roadway lines and create crossing breaklines all over the place.
So, depending upon how you are building the surface, you may want to allow crossing breaklines. It may be the only way to get the data in that you want.
but I don't know how that will affect my surface
It depends on what elevation option you choose to resolve the situation: First, Last or Average.
Generally, it's better to take a few steps back and resolve your data implementation approach, and eliminate Crossing Breaklines.
can you give us a brief description of how this surface is created?
For example.
Add points
define outer boundary
swap tin lines
holes are appearing.
OR
start design surface 1
paste design surface 2
paste corridor surface
many ways to build a surface and each have their own inherent idiosyncrasies
It was built by using point groups only, however, I have done considerable editing of the surface.......by adding or deleting tin lines.
deleting interior tin lines can cause many issues. Those deletion edits are creating the holes in your tin and oftentimes you cannot get the tin back with addtinline. See this thread and check and see if any of it helps.
http://forums.autodesk.com/t5/AutoCAD-Civil-3D/a-hole-in-my-surface/td-p/2135129
I found a thread where a crossing brakline error was reported and no breaklines were known to exist. not sure why you are getting this message and the other thread I found provided no solution either for a similar predicament. I am baffled by that.
If you are trying to recreate a surface built from an aerial topo and you have the typical dataset of acad points, contours and breaklines you may want to limit the surface definition to the points and contours only.
John Mayo
Thanks John. The comments by Dana in the thread you pointed me to seem to fit my situation exactly.
From now on I will 'Add Lines' only and let the software rearrange the lines accordingly.
Thanks, again.
Garry
you can use the add line functionality without deleting the lines already there. It works like a mass swap edge command. It treats the line yuo want added as if it were a breakline and then swaps all the necessary edges to conform. this will avoid the "black holes" that occur when deleting interior tin lines.
From now on I will 'Add Lines' only...
Whoa, step back! Too extreme....this is kind of subtle now....
That's not what she's saying. She suggests deleting surface points rather than deleting surface lines. Deleting surface lines creates holes.
Deleting surface points causes re-triangulation and does not create holes.
I like the one person's suggestion of placing a surface point just to get triangulation going over the hole, and the deleting the surface point.
"you may want to limit the surface definition to the points and contours only."
This approach typically does not allow the new surface to sucessfully emulate the V-shape of the contours in drainages, nor the depict the correct longitudinal slopes of the drainages provided by the breaklines.
Perhaps try adding the points and breakilnes first, then add the contours as breakilnes. Then choose to Allow Crossing Breaklines with the option Last selected.
Hey Fred. With field shot data things are different because the data is much more accurate. In these cases I agree the build order and I would never exclude breaklines. When dealing with aerial topo pavement breaklines rarely match contour elevation in my experience (I think that is the issue in this post) and rarely do I see a well defined crown in these contours. We also have bld outlines at roof elevation and other things to deal with like the fact that it will never match the original perfectly and it's most likely not accurate enough to build with (at least in our area). In that case, for my purposes, I want my new contours to be smack on with the source. My map will match their map. I don't want anyone asking why contours are different. So with the points and contour only method I get a great match in less than 5 min almost every time. The last thing I want my staff to do is spend 1/2 a day fixing work that was already completed by others.
John Mayo
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