Parrallel String on same x-fall
Parrallel String on same x-fall
Is there a function, to parallel a string outwards, and keep it on the same x-fall from the crown... i.e. we have to widen a long stretch of road by 2 metres, and the x-fall from the crown changes rapidly from negative to positive and vice versa
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Marc Ferguson
- Posts: 133
- Joined: Tue Dec 06, 2011 1:25 pm
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Steve Hunter
- Posts: 1079
- Joined: Mon Nov 07, 2005 7:30 am
In addition to Marc's method (thanks Marc, I never knew that option existed either):
Assuming you have some form of grade correction to consider (Minimum and Maximum Crossfalls), another feature to look at is the road widening macro under Design > Roads > More > Road Widening.
It will not generate a parallel string for you, but will give you some valuable guides as to what level to use in your design edge. You will get the direct extension of the crossfall, as well as the minimum and maximum xfall, assuming you have these criteria to consider in your final levels. You can then thread the vertical alignment of your new design road edge through these surfaces.
If you are using an Apply Many Function to design your new edge, you could transfer those design levels to your strings with a xfall to string modifier, or simply a xfall to tin on the extension of existing surface tin from the widening function if you only want the extension levels.
There is also a fairly sophisticated Overlay Design Utility under Design > Overlay, which allows you to evaluate the existing xfall, and generate the widening based on the results.
As with most things in 12D, there are several ways you can do something, which allows you to pick the one best suited to your project requirements.
Assuming you have some form of grade correction to consider (Minimum and Maximum Crossfalls), another feature to look at is the road widening macro under Design > Roads > More > Road Widening.
It will not generate a parallel string for you, but will give you some valuable guides as to what level to use in your design edge. You will get the direct extension of the crossfall, as well as the minimum and maximum xfall, assuming you have these criteria to consider in your final levels. You can then thread the vertical alignment of your new design road edge through these surfaces.
If you are using an Apply Many Function to design your new edge, you could transfer those design levels to your strings with a xfall to string modifier, or simply a xfall to tin on the extension of existing surface tin from the widening function if you only want the extension levels.
There is also a fairly sophisticated Overlay Design Utility under Design > Overlay, which allows you to evaluate the existing xfall, and generate the widening based on the results.
As with most things in 12D, there are several ways you can do something, which allows you to pick the one best suited to your project requirements.
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Glenn Coppard
- Posts: 233
- Joined: Thu Jul 24, 2008 7:44 am