Issues with superimposed profiles

[zsharp]

I'm using civil 3D 2014 and this is also the problem I am having >> see link below <<. I'm leading a large BRT project and there is only one segment where the CL alignment is turning on itself but in severall places. As a result I have this same issue where my superimposed profiles are freaking out and displaying zigzagged trying to project to perpendicular the the CL alignment but also to points perpendicular between the CL to itself. Anybody know a work around? You will be my hero!!! 😄 http://forums.autodesk.com/t5/autocad-civil-3d-general/superimposed-profile/m-p/3667678/highlight/fa...

[Anonymous]

Hi,

Have u tried limiting the super-imposed profile to the specific chainage range rather than displaying them for the total length, Right click on the super-imposed profile and modify the start and end points. Please let me know if this works.

Thanks,

Palanirajan

[zsharp]

I have modified the range of station and it unfortunately doesn't fix the issue. The superimpose profile function is flawed in that it doesn't know how to treat areas where the centerline doubles back on itself (is parallel). Everywhere this occurs is where the profile tries to superimpose at both locations producing zigzag lines. The link i pasted in my original post is a discussion i found in searching for a fix and the user is having the exact same issue. The response was this is a flaw and it hasn't been fixed. This old discussion was in 2012 so I'm reaching out hoping something has changed or someone has a fix by now.

[Joe-Bouza]

Hello Zac

I don't have a definitive answer but more questions.  I don't necessarily think it is a bug more than it is a geometric quandary, and a person might have trouble locating some points by hand let alone superimposing. 

for example the point below can exist at more than one location along the alignment, yes? 

This example the station offset of the center of the arc could be anything between 3+68 to 9+67. why did the software pick 9+67? my guess is it just picked one instead of crashing.

This example illustrates  how a single point can exist at many placees and how absurdly far apart.

[zsharp]

Joe,

I really appreciate your great illustration and you taking the time to reach out! This is exactly what I was trying to explain is happening. I've seen this same issue as your illustration with calling out station offset even back in LDD days. I guess considering this obvious issue since way back when, as well as the post I referred to with someone else having the same issue with superimposed profiles back in 2012... I had hoped there was a work around somebody has come up with. Basically what autodesk needs to come up with is a width/distance control for projecting or superimposing profiles.  Wishful thinking! 😄

zac 

[Joe-Bouza]

There is an idea station forum where that would be good content to add and maybe someday wec can see it.

[Civil3DReminders_com]

I'd try creating a corridor, in this corridor it would be a simple LinkWidthAndSlope from the source alignment to the desired alignment. I'd target the alignment and profile. I'd then extract a profile from the corridor which will then be associated with the alignment you desire.

[Joe-Bouza]

Hi Chris

How will that eliminate the zig zag due to switch back? And or a bisecting alignment through the trough of the switch back?

[Civil3DReminders_com]

It doesn't really fix it, it lets you control what data is in the profile. 

[Joe-Bouza]

I invision quire a few corridor Bow ties 😮