Intersection Terrain Model

RE: Intersection Terrain Model

Ray Thwaits — Mon, 20 Sep 2021 17:42:51 GMT

I don't think the problem shown in the pictures is necessarily related to your intersection modeling approach.

The triangulation in the picture is likely due to the boundary in that quadrant being either ignored or non-existent. I would investigate that issue after I'm satisfied with the model inside the intersection.

I have yet to model an intersection with the OpenRoads tools so I'll let some who are more experienced with that aspect of your modeling to others more experienced (such as MaryB and Mark Shamoun). With any model, though, I focus on the top surface before I spend too much effort on the subsurface layers.

RE: Intersection Terrain Model

Kevin Bogert — Mon, 20 Sep 2021 16:45:40 GMT

Is this done by using the "apply external clipping" prompt when applying a surface template? I can't seem to get this to work.

RE: Intersection Terrain Model

Mark Shamoun — Sat, 18 Sep 2021 05:16:53 GMT

Hi Kevin,

You can apply as many surface templates as you like to the same terrain. You can even create a boundary and apply the surface template to a section of the one terrain.

RE: Intersection Terrain Model

MaryB — Fri, 17 Sep 2021 20:27:36 GMT

I think having a centerline for the roadway and for the intersection, separately, is the way to go. I'm not sure what happens when you try to have one feature as part of two different terrains, but I suspect it isn't good.

RE: Intersection Terrain Model

Kevin Bogert — Fri, 17 Sep 2021 19:07:36 GMT

I am adding that centerline to both the roadway and intersection separately. Which terrain should be active? I guess I'm not sure, I think my existing ground survey is the active terrain. Neither terrain should be targeting each other.

It's likely I could have made an unintentional rule with Civil Accudraw.

I did get it to work using your 0.0 offset idea of my centerline and basically just made two centerlines, one for the road and one for the intersection. Probably not the best way to do it but it seems to have worked.

RE: Intersection Terrain Model

MaryB — Fri, 17 Sep 2021 19:02:47 GMT

Oh, that's not right...Hmmm...

Are you adding that centerline to the intersection, to the roadway, or to both?

Is it possible that you had the wrong terrain active when you added that centerline?

Is either terrain targeting the other?

It definitely looks as if the "southwest/lower left" corner of your intersection is now targeting that centerline.

With Civil Accudraw, it is very easy to create unintended rules. It's possible that you Accusnapped to something and created a rule without realizing it.

RE: Intersection Terrain Model

Kevin Bogert — Fri, 17 Sep 2021 15:50:38 GMT

No they definitely don't have to be the same terrain model. My initial approach was to just have 2 separate terrains, My first stretch worked fine, and when I did the intersection terrain as soon as I added the centerline it triangulates the entire stretch.

The first picture is after I created the terrain with the boundary. The second picture is when I add the centerline as a breakline.

RE: Intersection Terrain Model

MaryB — Fri, 17 Sep 2021 15:46:22 GMT

But do they have to be the same terrain model? You could design several different terrains to your specifications.
That's the approach I am using. I have a rehab project with a number of intersections, milling depths, pavement types, etc., and I am designing it in parts to match the different regions. So far that seems to be working well enough.

If you want one model to control the design features, you can always go to the next model and use the "Single Offset Entire Element" by a distance of zero. At that point, I believe your secondary feature is controlled by/ruled to the primary feature, so the changes in the primary perpetuate.

RE: Intersection Terrain Model

Kevin Bogert — Fri, 17 Sep 2021 14:21:22 GMT

I guess an easier way to ask this.. How do I apply two different surface templates to the same terrain model? I guess this would be a way to do it as well.

Thanks