Offset a 3d polyline/feature line with specific slope and grading

[dorvoscristian20]

Hello,

It's been a while since I've been trying to find out how I can offset a 3d polyline/ feature line with a final grading percent and slope between also.

I tried here a sketch with the situation.

Thank you!

[Anonymous]

You can use grading tools on feature lines and 3d polylines. If you edit the grading criteria you set the target (distance, elevation, relative elevation, surface) and projection (slope, grade) .

[dorvoscristian20]

I was trying, what I can set is the slope or grade between the 2 feature lines, what I need is the slope (2.00:1 example) and the final grading elevation to have ( 2% slope), that for me means that I can not set a target like distance or elevation or surface, because non of this are fixed. (sorry for my English, I m trying my best) 🙂

[Anonymous]

two feature lines that both have elevations means there is a predetermined slope between them. But you want a 2% slope. Should the grading at 2% end where the second feature line is? It sounds to me like you need to create a fake surface that is almost, but not quite, vertical at the "target" feature line. So that the grading will go out at 2% until it hits the "vertical" surface at the second feature line. The result will be a third feature line on top of or below the second feature line that is 2% slope away from the first.

Or, just do it manually. Draw lines between the two feature lines, adjust the Z at the end at the second feature line to be 2% from the first feature line, then draw a new feature line snapping to the ends of the lines drawn.

Of course, I probably totally missed what you are trying to do here.

[dorvoscristian20]

I will attach a small drawing and I hope that will explain better what I m trying.

-the green road is an existing one

-the red one is what needs to be build ( I god this result by doing it manually, vertex by vertex) - Is there anything more easy that I can do?

[Joe-Bouza]

"elevation by adjacent grade does this"

[Anonymous]

I am still not sure what you goal is, but see attached. at the "target" 3d polyline, I created an almost vertical surface by offsetting the 3dpoly a very small distance and up/down 25m. Then I created a grading object with the  feature line at 2:1 slope into the vertical surface. Is this what you are trying to accomplish?

[dorvoscristian20]

Good morning, 

Thank you for all your answers, not really, what I want to accomplish is exactly what I have attached ( the green road is existing one, and I m looking for a tool that can build the red berm more easy than I m doing it now, now i make a feature line and from the level of the existing road using the elevation table I m giving the 3% grading and after I will just move each vertex closer of further than the existing road to reach the 2.00:1 slope.

Thank you

[dorvoscristian20]

Thank you for your answer, but I think that this tool is fixing half of my problem, will fix the slope/grading between the 2 feature lines by chancing the levels of the targeted feature line but will not give me the 3% slope on the targeted feature line, because for this the tool needs to change the position of it not only the level.

I think that the answer for my question can be find somewhere in the grading tool, but I just don't find out where and how to ask for it 😞

Thank you again

[Anonymous]

Attachment?

I am starting to wonder if a corridor is what you want as we now seem to have two slopes, 2:1 & 3.0%.

[Joe-Bouza]

I had that same thought. However, if the new road is to have a constant grade the position of the new road would vary depending on the profile grade desired and the cross slope of the embankment.

the new road meets the existing at a point. if that point were held and the constant grade drawn back in profile . then an assembly set on the existing road FL with a link slope elevation target should place the new road.

[Joe-Bouza · Accepted solution]

@Anonymous & @dorvoscristian20  works like a charm

of course it can be refined once determined

[dorvoscristian20]

This looks like a solution for my issue. I will try it to see how works.

Thank you!