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 ?
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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?
define outer boundary
swap tin lines
holes are appearing.
start design surface 1
paste design surface 2
paste corridor surface
many ways to build a surface and each have their own inherent idiosyncrasies
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.
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.
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.
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