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Descartes Point Cloud Presentation

Curtis Slater
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Hello, 

So I am extremely new to Microstation as well as Descartes so this has been a rough transition from AutoCad and any and all help here would be wonderful.

I have a pipe that I am trying to model by section from a point cloud.  I have created my section and am trying to setup a template to use as I walk forward.  While learning the basic fundamentals of this process I have contacted the bentley support and they resourced me to a video of a woman giving instructions on how to do this process, however, in her video she uses a B-spline curve to create the template.  I, on the other hand have a known diameter pipe and would like to use a circle for the template.  I have drawn the circle using the base geometry tool and when I go to select it for my template it says it is not valid for the tool.  I understand that the problem here is almost slapping me in the face but I find it rediculous that the program would only allow for splines to be  used as a template.  

Any and all help with a solution or to understand why this is would be greatly appreciated.  

Thanks

  • 0 Offline
    I'll verify why we cannot use circles as templates for the model by section tool.

    In the meantime, since you are trying to extract cylinders, did you have a look at the "Fit Cylinder" tool?

    This tool is specifically designed to extract cylinder elements from point cloud. It only takes one click to extract a cylinder.

    Here is some more information on the tool:
    communities.bentley.com/.../fit-cylinder-improvement
    communities.bentley.com/.../10570

    HTH,
    Pascal


     This is a test

  • 0 Offline in reply to Pascal Cloutier
    I thought about using the extract cylinder tool, the only problem being that the whole reasoning for trying to use this software is because about halfway down the pipe there is a section that is blow out and the client is trying to determine the volume of the exploded area as it has been blown for many years and due to high water pressure it has created quite a large whole in the concrete and the model by section seems to be the, I hesitate to say, "best" approach but possibly will provide the most accurate volume calculations given an small distance between sections.

    Another problem I am having now is that I essentially need two shapes within my template but not for every section, but for either end of the blowout since there is remaining pipe that extrude into the whole. I am thinking what Ill have to do is do 3 separate models, convert them to meshes and then join them. But any input would be great as I have about 20 hours of experience with Microstation/Descartes.
  • 0 Offline in reply to Curtis Slater
    That's an interesting workflow.

    I think the Cylinder Extraction tool would be the easiest way to extract to parts of the pipes that are still intact. then, you can use Model by Section to modelize the part that's blown out.

    Finally, you could use MicroStation's solid Modeling tools to unite the different solids.

    Pascal


     This is a test

  • 0 Offline in reply to Pascal Cloutier
    So I attempted to use the Cylinder Extraction tool and for some reason Descartes would not identify the part of the point cloud that is clearly a cylinder as a cylinder.

    So, as a result, I believe I am back to trying to do it in three individual model by sections using a different template for each and then joining them after the fact.

    I am interested to see if you made any headway on the reason a circle cannot be used in a template. I am going to test it with some of the other base geometry shapes and see if they work. Please let me know if you find anything.
  • 0 Offline in reply to Curtis Slater
    Hi Curtis,

    Which Fit Cylinder mode are you using? The one point or the three points? Have you tried both?

    Also are the cylinders have missing or occluded parts? The Fit Cylinder should be working even if the cylinder is not completely model, but maybe this is the problem?

    Also does the cylinder are represented with a great density of points? If the density of points is too low the 1 point fit cylinder could fail. The three points mode should be used instead.

    HTH,

    Mathieu



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