e57 point cloud from Recap import problem

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    Ondrej Trhan CR

    Hi Max, is the exported point cloud ordered or unordered? What type of scanner was used for scanning?

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    Max_pklv

    Thank you for the reply, Ondrej!

    Its Faro Focus S70. Could you please specify what is ordered or unordered? And how that can be achieved in Recap Pro?

    Max

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    Ondrej Trhan CR

    Ordered means it has a 360° scanner position baked into the point cloud data per scan position (when you are moving with a backpack or using a car there are no actual scan positions, just georeferenced point cloud data).

    Ideally, RealityCapture works with scanner data exported per scan (per 360 terrestrial scan position). 

    In most cases, 3D laser scanners on cars or backpack laser scanners are producing unordered data, because no 360 laser scan position is really calculated. RealityCapture only natively supports ordered data from terrestrial static laser scanners like Faro S130.

    We do not support any data from devices like Faro Freestyle 2, which are producing un-ordered scan data (each 2d camera position is not recording during the scanning session or we do not have data from that session after export). That is why we have created this workaround with fake 360° scan positions: https://support.capturingreality.com/hc/en-us/articles/360020653080-How-to-import-any-scan-data-to-RealityCapture-using-CloudCompare-and-Faro-Scene-How-to-create-ordered-point-cloud-from-unordered-.

    Basically, you are trying to layout scans in the Faro Scene as you would scan places with the Faro S130 on a static tripod. The only difference is that now you are trying to layout these scan positions virtually in Faro Scene.

    The reason why RealityCapture requires knowledge about camera position is that it´s a photogrammetry software (we take laser scan data as camera positions, not as point clouds).

    You can find the option here in Faro Scene:

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    Max_pklv

    Thanks, Ondrej!

    I would suggest that we have ordered point cloud, as Faro S70 scanner is a stationary scanner.

    We are using Autodesk Recap, rather than Faro Scene to produce a point cloud and export it as e57 format file.

    What comes into my mind, is that the point cloud we have is combined interior and exterior. When you scan the exterior with Faro S70, GPS is turned on. When we scan the interior GPS is turned off. So half of our scans in the point cloud have GPS, half don't.

    Max

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    Ondrej Trhan CR

    Yes, it this that kind of scanner. But point cloud needs to be save also in that way. I think it is supported also by Recap. In which software did you aligned the laser scans? Did you export it as unified point cloud?

    The combination of interior and exterior shouldn't influence this. It is most propably the way, how it is saved from Recap. 

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    Max_pklv

    We used Recap Pro to align the scans. And e57 is not unified. That might be a problem?

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    Ondrej Trhan CR

    Hi, when you open that E57 file in CloudCompare are you able to see, if it has TLS/BLB (laser scan position)? No, the point cloud unification couldn't be a problem. You need to export E57 also with the laser scans positions.

    Can you try to export it as is described here: https://knowledge.autodesk.com/support/recap/learn-explore/caas/sfdcarticles/sfdcarticles/Individually-export-single-scans-from-ReCap-project.html?st=export%20e57%20single%20scan?

    Also, I found here (https://knowledge.autodesk.com/support/recap/learn-explore/caas/CloudHelp/cloudhelp/2017/ENU/Reality-Capture/files/GUID-BE7784C3-9B58-426E-9303-81292C8CF4E7-htm.html), that ReCap 360 support exporting to the structured E57 format (individual scans, with row/column info, including registration transforms). So it seems, that you need to have ReCap 360 for ordered point cloud export. Are you importing the Faro's formats right into ReCap?

     

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