Dynamic linking

[Nik-D]

Hi all, I am producing concept earthwork designs using road layouts and plot pads. For speed I use 2D polylines set at an elevation as breaklines for the plot pads and with the generated corridor surface produce the FG surface to generate final contours and earthwork volumes. I find this method quick enough that a variety of options can be explored quickly. Q: Is it possible to dynamically link the road profiles as per the intersection wizard, but without creating an intersection? Q: is it possible to link the elevation of the 2D polylines used for plot pads to a point on a road corridor such that if the corridor changes then so doed the elvation of the plot pad.? I think the answer is no to both questions but I would like the opinion of others Cheers Nik-D

[troma]

1. (Intersection without an intersection object) Yes. That's what I do. You just have to uncheck some boxes when creating the intersection. Then the secondary profile will automatically update when you edit the main profile.

2. (linked elevation) Maybe. Not sure I understand totally. You can extract a dynamically linked feature line from the corridor. But that won't update other points off of that line.

[Nik-D]

What I am trying to accomplish is to use a 2d polyline as a concept house plot boundary. I assign the polyline an elevation based on an elevation I take from a corridor passing it. I use the polylone as a break line to form a surface along with the corridor. However if I change the profile elevation of the corridor I have to manually change the elevation of the polyline. Can the polylime be linked to an elevation om the corridor. Bearing in mind I have lots of them

[troma]

Not that I know of, but some of the corridor/SAC specialists around here might think of something.

[doni49]

Is the horizontal position staying in the same location and just the elevation changes per the road way?

And will the targeted feature line have one elevation for the entire length?  If not, what determines the elevation of the pad?

[Nik-D]

Hi Doni I have attached a screen shot of an old draft showing the pads in yellow. At the moment there is no way to control the elevation of the pads without labling the corridor with a spot elevation and then applying that elevation as the elevation of the polyline/breakline.

[Joe-Bouza]

Spoiler

Yes you can.

I can post the sample file because it is too big.

0.1 make your corridor surface

0.2 make FG surf and paste corridor srf into it

1. Make all your pads alignments

2. Extract dynamic FL from the back of sidewalk and place in a site called TEMP

Create gradings off the BOSW the length of corridor defining slopes, hinges etc. Do this ignoring the geometry.      Specifically grade beyond the back of pads. Ignore daylight at this point. Have the gradings make an auto srf called something like TEMP.

4. Create surface profiles for all pad alignments using TEMP

5. Create dynamic FL from alignments choosing each pad (make sure they DO NOT go into site TEMP)

Add dynamic pad FL to FG

7. Create two perimeter alignments around the back and sides of the pads on both sides of the street side called perimeter1 and perimeter 2 (be sure they are covered by surface TEMP and create surface profiles for each using TEMP

8. Create dynamic FL from the two perimeter alignments into SitePerimeter

9. Create daylight grading off the two perimeter FL daylight to EG (DO not create a surface from these gradings)

10. Add perimeter FL and daylight FL to FG.

Now if you adjust you corridor profile all the lots and daylighting will react accordingly

[troma]

Not to rain on your parade too much Joe...
but as I understand the OP request, each pad is to be horizontal all the way round, but linked to the elevation of one point on the corridor (say at the midpoint of the frontage). If I follow your instructions, the pad will end up at the same grade of the corridor (the same grade as the controlling profile).

[Joe-Bouza]

Forecast is Sunny

simply change the grading scheme to grade to elevation across the lots and insert transition between

cant find a criterior to grade by dist to elevation regardless of slope. Why wouldnt you follow the corridor?

[troma]

Did you look at the picture in message 6? Pads are like steps up a stairs.

I think I would have a dynamic featureline from the corridor at the match point. Then have each pad also outlined in a featureline on the same site. Make a little jut out at the front of the pad, so both the start and end of the pad featureline are resting on the dynamic corridor featureline.
Now, when the corridor updates, the start and end point of the pad get updated too. Of course the rest gets left behind. So you need to open each featureline in the elevation editor, highlight all and use the button to grade all PIs to the same elevation from start to end.

Not really dynamic, but probably better that what you have?

[Joe-Bouza]

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<snip>
Not really dynamic, but probably better that what you have?

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That's cold dude

[troma]

Sorry. That was meant for Nik-D, not you. So, my point was, it's better than using a surface spot height elevation and editing the polyline to match the elevation.

I realised afterwards that I hit reply to the wrong person.

[Joe-Bouza]

No worries. Just bustin