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Grade feature lines to one another

34 REPLIES 34
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Message 1 of 35
charles.neely
840 Views, 34 Replies

Grade feature lines to one another

I have two feature lines I want to grade towards each other at different grades until they meet. Is this possible, and if so, how? Thanks.

34 REPLIES 34
Message 21 of 35

I'd be impressed to see that, Fred. the OP never said, but is the 4:1 radial to bottom stream line or to the 4:1 contour at the top. Call me pesemistic. Either way I see a train wreck in those coves; even with pencil and paper 🙂

Message 22 of 35

Capture.JPG



Fred Ernst, PE
C3D 2024
Ernst Engineering
www.ernstengineering.com
Message 23 of 35

Beautiful! How bout one of those ridculously tight cove 🙂
Message 24 of 35

Been away for a bit but came back to some great stuff! Thanks for all the posts. I'll start trying some different things and see what works. Chances are we'll end up in a different direction when it's all said and done. Thanks again!

Message 25 of 35
Neilw_05
in reply to: charles.neely

Another approach is to use gradings to create a surface "pan" @10:1 slope from the centerline wide enough to overlap the edge lines, then target the pan surface with 4:1 gradings from the edges. The 4:1 gradings will be the sides the pond. Lastly, close the ends of the pond and add infills between the centerline and the 4:1 gradings to complete the model.

 

Incomplete example (2013) attached.

 

By the way, the projected 10:1 bottom ends up higher than the edges of the pond.

Neil Wilson (a.k.a. neilw)
AEC Collection/C3D 2024, LDT 2004, Power Civil v8i SS1
WIN 10 64 PRO

http://www.sec-landmgt.com
Message 26 of 35
jmayo-EE
in reply to: Neilw_05

Ideally a grading should miter and handle the coves as seen in untitled1.png. One issue I have with the data for this is that this grading breaks down if you try to model it all in one or even two gradings on two sites. The other issue is that I do not believe the 10:1 and the 4:1 slope will intersect all all. See untitled2.png.

 

 

John Mayo

EESignature

Message 27 of 35
Neilw_05
in reply to: jmayo-EE

You are right about the sites being an issue John. This is a good example that demonstrates one of the problems we have with the site paradigm. While it serves well to ensure continuity when features and gradings interact, it often works against us as well. I have wished for the abilty to create siteless gradings and featurelines, much like we have with alignments, as a way to deal with it, or perhaps allowing objects to belong to multiple sites. I'm sure Autodesk is aware of the problem but hasn't found a way to deal with it.
Neil Wilson (a.k.a. neilw)
AEC Collection/C3D 2024, LDT 2004, Power Civil v8i SS1
WIN 10 64 PRO

http://www.sec-landmgt.com
Message 28 of 35
Neilw_05
in reply to: Neilw_05

Also, as I noted earlier, the 10:1 and 4:1 do intersect, just not in the way the user would want. The 4:1 slope has to project upwards to intersect the 10:1 bottom slope.
Neil Wilson (a.k.a. neilw)
AEC Collection/C3D 2024, LDT 2004, Power Civil v8i SS1
WIN 10 64 PRO

http://www.sec-landmgt.com
Message 29 of 35

According to the OP's earlier post, the 10:1 projects downward from the pond CL FL creating a W shape in the finished grading

 

Your drawing demonstrates exactly what I've said from the beginning: the 4:1 fron the top of the pond wont work

Message 30 of 35

I don't see anything that indicates that. The graphic that was provided does have slope arrows but those don't necessarily indicate the flow direction. Based on the description I believe the intent is for the lake to have a flowline at the center. Perhaps the OP will clarify. In either case the solution should be the same though.
Neil Wilson (a.k.a. neilw)
AEC Collection/C3D 2024, LDT 2004, Power Civil v8i SS1
WIN 10 64 PRO

http://www.sec-landmgt.com
Message 31 of 35

Both slopes are intended to project down. see the OP's post
Message 32 of 35

I do see the slopes are to project towards each other, not down. The fact that he calls the centerline a channel indicates a flowline to me. Again we can wait for clarification.
Neil Wilson (a.k.a. neilw)
AEC Collection/C3D 2024, LDT 2004, Power Civil v8i SS1
WIN 10 64 PRO

http://www.sec-landmgt.com
Message 33 of 35
charles.neely
in reply to: Neilw_05

The centerline is the channel of a creek running through a golf course, it is dammed at the northerly end to form a pond currently. The lake edges are the proposed shaping. The idea is to grade up at 10:1 from the channel and down 4:1 from the bank and intersect. Does that help clarify? I think the poster who mentioned the 4:1 has to come up at some point to merge w/ the channel projection has it right. Isn't looking like that plan will work.

Message 34 of 35
Neilw_05
in reply to: charles.neely

The edges need to come up or the channel needs to go down or the bottom slope needs to be flatter to make the scenario work.

In regards to the site issue that John mentioned, we can still use gradings to solve the problem. The workaround is to use the featurelines from the gradings as breaklines in the finished surface model rather than making the surface from the gradings. You'll have to play with the build parameters to get a decent boundary.
Neil Wilson (a.k.a. neilw)
AEC Collection/C3D 2024, LDT 2004, Power Civil v8i SS1
WIN 10 64 PRO

http://www.sec-landmgt.com
Message 35 of 35

In my mind two opposing flow arrows means two opposing directions, but I see your point

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