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BRT SS4 & tunnel pointcloud

Drizzle
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With BRT SS2 I was able to export a point cloud of a tunnel as xyz, then import the points to a dtm and get the points on a cross section. When I import the point cloud to an SS4 terrain and then draw cross sections it gives me line that joins all the points top and bottom, which is less useful.

I could split the point cloud and import top and bottom separately but is there a way to just draw the points? have I missed something?

  • 0 Offline

    No you didn't miss anything. This workflow is not possible anymore because you can't project points from a DTM to the cross sections. Cross sections are a true section of the 3D model. You found a workaorund. Another is to get the tunnel as a mesh from the point cloud. ContextCapture should be able to do this but I never tested myself. Then we will have to check what will be possible in Openrail where cross sections are named boundaries with depth forward/backward



  • 0 Offline

    I experienced the suggested workflow using ContextCapture Master to compute mesh from Points Cloud. The result was quite good.

    Situation with Rail Track SS4:

    • you can't project points from DTM to cross sections
    • you can use dynamic views (clip volume) to get sections with a slice of point clouds. but manual process
    • you can reference a reality mesh: 3mx generated by ContextCapture

    Suggested workflow:

    1. Create the mesh from PointCloud using ContextCapture Master
    2. Reference the mesh in your Rail design project: you will get the shape of the mesh in dynamic and drawing cross sections

    Even more:

    1. Create a new 3D drawing and reference the 3mx
    2. Merge the mesh reference in the current file
    3. Drop the mesh: you will probably get many meshes
    4. Stich the meshes into one mesh
    5. Assign feature to the mesh
    6. Use this mesh as a target for your corridor

    NOTE: in the future OpenRail Designer will allow using a reality mesh (new format 3sm) as a target. Should be already available in the upcoming OpenRoads Designer release, but must check. Steps 2 to 6 above could also apply to IFCs.



  • +1 Offline in reply to jpln

    Thanks for that, an interesting exercise.

    I don't think my computer is up to the task of Context Capture, I understand that 32GB ram or more is needed, so I will ask a colleague to try it out and produce the mesh, and I will see how that works in SS4. 

    Answer Verified By: Drizzle 

  • 0 Offline in reply to jpln

    Can the points on the cross-section be exported as xyz co-ordinates for use in gauging software, ClearRoute.

  • 0 Offline in reply to tingleyr

    Well, I don't know ClearRoute capapbilities, but I found this:

    ClearRouteTm 2 is compatible with all forms of data collection,

    and is particularly suited to the measuring systems developed

    by Balfour Beatty, such as the lightweight measurement laser

    scanner, LasersweepTM

    So I would say that ClearRoute is able to use laser scan data. If yes, the idea would be to use the source data from which you create the mesh, or ContextCapture to output as point cloud.

    I don't think we've got an efficient way to get the XYZ of the cross sections.



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