Modeling of existing buildings and their damage

Hi,

I will have to build 3D models of several existing and operational buildings. Based on the point cloud from photogrammetric survey, a building model will be created. Then, it will be necessary to include information about damages to the building's facade, such as cracks and fractures, in the model. Therefore I have two questions:

1. Does OpenBuildings Designer have any special features that facilitate building modeling from point clouds? The facade of the building is the most important, and the interior does not need to be modeled.

2. How can I store information about damages in the model in such a way that the exact location of each damage is recorded? Additionally, the information about damages should be exported to IFC along with the entire model.

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  • Hello Maria, 

    The points cloud .pod file can be attached inside OBD and by tracing that you can create your buildings. 

    Regarding, The information, OBD used datagroup properties to store information, You can create your custom properties which will store the data about the cracks and they can be exported to IFC as well as properties. 

    Regards,
    Alifur

  • Does OpenBuildings Designer have any special features that facilitate building modeling from point clouds?

    To add to Alifur's reponse: Yes and No. 'Facilitate' covers a lot of ground. Mstn which OBD includes has been very good at incorporating point clouds and reality meshes, way ahead of competitors. But, neither Mstn or OBD has much for Scan2BIM OOTB.

    Point clouds: Mstn has long supported this, but point clouds are considered an intermediate format these days, with most users converting to reality meshes as point clouds will sloooow even Mstn, Navigator down. The new imodel format can stream point clouds which should help... but I doubt it will stop users converting from PCs as soon as possible. See this example of PC, reality mesh sectioning and tracing over with OBD elements.

    Mstn/OBD is a good platform for Scan2BIM as it supports a lot of survey formats including CAD, mesh formats which other more BIM-oriented apps like Revit will struggle with. OBD also supports hybrid BIM models by providing tools to segment and classify point cloud / reality mesh objects, so not everything has to be converted into BIM geometry to carry data, quantification, clash detection, allow snapping etc. Mstn / OBD's CAD orientation supports Hypermodeling 2d and 3d and PC info.

    Descartes/Context Capture: You will probably need Descartes/CC as a companion app for any serious work. CC has a lot of support for aerial drone info... which should also help with facades. I think Bentley has also been doing some work with high precision camera systems for telecoms towers. Might be interesting if you are looking at cracks, and measuring them for preventive maintanance.

    Automatic vectorisation: there are other apps like Topodot have some tools for buildings.

    2. How can I store information about damages in the model in such a way that the exact location of each damage is recorded?

    Again, you will probably need to go beyond Mstn/OBD. CC already has an automatic vectorisation tool for the cracks and can export to iTwins for storage, updates etc. iTwins being a repository that can store multiple formats from different apps, including the important photo 'evidence' or any cracks or other material degradation. Orbit GT is also another powerful platfrom for managing photos spatially.

    The old photogrammetry addons like PHOCAD have some pretty useful tools generally... but I am not sure they have ported to CE. It would be great if Bentley could incorporate into Mstn or Descartes! 

    As you would probably have gathered by now, one the problems with using Mstn for Scan2BIM is the number of licenses you need which would only be feasible for large projects. Hopefully, something that can be negotiated to kickstart adoption in the SME sector.

    HTH

Reply
  • Does OpenBuildings Designer have any special features that facilitate building modeling from point clouds?

    To add to Alifur's reponse: Yes and No. 'Facilitate' covers a lot of ground. Mstn which OBD includes has been very good at incorporating point clouds and reality meshes, way ahead of competitors. But, neither Mstn or OBD has much for Scan2BIM OOTB.

    Point clouds: Mstn has long supported this, but point clouds are considered an intermediate format these days, with most users converting to reality meshes as point clouds will sloooow even Mstn, Navigator down. The new imodel format can stream point clouds which should help... but I doubt it will stop users converting from PCs as soon as possible. See this example of PC, reality mesh sectioning and tracing over with OBD elements.

    Mstn/OBD is a good platform for Scan2BIM as it supports a lot of survey formats including CAD, mesh formats which other more BIM-oriented apps like Revit will struggle with. OBD also supports hybrid BIM models by providing tools to segment and classify point cloud / reality mesh objects, so not everything has to be converted into BIM geometry to carry data, quantification, clash detection, allow snapping etc. Mstn / OBD's CAD orientation supports Hypermodeling 2d and 3d and PC info.

    Descartes/Context Capture: You will probably need Descartes/CC as a companion app for any serious work. CC has a lot of support for aerial drone info... which should also help with facades. I think Bentley has also been doing some work with high precision camera systems for telecoms towers. Might be interesting if you are looking at cracks, and measuring them for preventive maintanance.

    Automatic vectorisation: there are other apps like Topodot have some tools for buildings.

    2. How can I store information about damages in the model in such a way that the exact location of each damage is recorded?

    Again, you will probably need to go beyond Mstn/OBD. CC already has an automatic vectorisation tool for the cracks and can export to iTwins for storage, updates etc. iTwins being a repository that can store multiple formats from different apps, including the important photo 'evidence' or any cracks or other material degradation. Orbit GT is also another powerful platfrom for managing photos spatially.

    The old photogrammetry addons like PHOCAD have some pretty useful tools generally... but I am not sure they have ported to CE. It would be great if Bentley could incorporate into Mstn or Descartes! 

    As you would probably have gathered by now, one the problems with using Mstn for Scan2BIM is the number of licenses you need which would only be feasible for large projects. Hopefully, something that can be negotiated to kickstart adoption in the SME sector.

    HTH

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