Creating a Terrain Model from Multiple Corridors

I assume from the lack of other responses that there is no good way to accomplish this?  The method referenced above does not work with 3d features from the corridor.  Furthermore, when these features are added to a terrain model it triangulates to the limits of the feature, which most of the time extends far beyond the limits of the required terrain model.

It seems that the only way to accomplish this, until improvements to the software are released, is to copy the graphics from the corridor, breaking the linkage to the corridor, and importing those graphics.

Try to create separate terrain model from each corridor  and then create complex terrain model.

That is not the issue at hand in this particular situation.

I have several corridors which are part of an interchange.  In many areas, the infield areas, there are some portions of the corridor that I want to maintain and others that should be removed.  Basically to complete the grading in these areas.

I know I could import the graphics but that breaks the link back to the corridor.  If you simply import to corridor lines, it will work, but in most cases those lines extend far beyond the limits of the infield area in question.

I am wondering what the recomended workflow would be for an area like this?  From my investigations it does not appear to be possible without breaking the linkage back to the corridor.  Therefore, I think this type of work should be done late in the design process, when most of the corridors have been already set.

I am not sure if this will achieve what you are looking for or not but worth mentioning.  If you change the project settings for each corridor to output a "top mesh", then you can make one terrain model where all top meshes would be included.  There is also a mesh tool in MicroStation where the boundary of each mesh could be extracted.  I have created a video on this topic you might take a peak at.  

The link will be good for about a week.  With the mesh boundary extraction, you would have to make one for each mesh and work with it accordingly.

ftp.bentley.com/.../CreatingTerrainModel.zip

Chuck

Hi Marc

If I understand you :

1. there are multiple corridors coming together at an exchange

2. you need to create a top surface of a limited area including several corridors at the exchange area

3. your concerned about the integrity of the terrain due to overlapping features from multiple corridors.

I believe Mark and Adam have the answer when combined. The process would look like this :

1. create a new 3d dgn

2. attach the corridors used in the exchange (3d model)

3. turn off the component display through level manager or project manager in the original files

4.create individual terrains (we will borrow site modeler terminology here and call these objects) from each corridor by selecting the key breakline features i.e. CL, EoP, ToC, BoC etc.

5. Concerning overlapping features- it is a general practice when creating intersections or target alias of corridors to use corridor clippling. this process clips one corridor based on the boundary of another corridor (or terrain) - when a corridor is clipped the 2D entity of the clipped corridor feature remains, however the 3D corridor features will clip. since we are referencing the 3d features you will only be triangulating the features as displayed

6. create a complex terrain, select a main corridor object and add the secondary objects , using the merge function (note to use merge they all must intersect the main object - another option might be to use the existing ground as the main terrain..

7. last draw a 2D element (shape) and create a clipped terrain from the complex....the boundary can be made to fit as close as needed and the resulting clip terrain should update if any aspect of any of the corridor models or boundary is  modified...

HTH Mike B