Wall deformation analysis workflow

Deformation Analysis Software for 3D Point Cloud Data eg CloudCompare
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anamyslak
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Wall deformation analysis workflow

Post by anamyslak »

Can someone point me in the right direction on how to derive wall deformation deviations using Cyclone? I tried creating mesh, TIN and sample grid from active TIN at defined intervals but that didn't give satisfying results. Any help will be greatly appreciated.
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Re: Wall deformation analysis workflow

Post by ChrisJPalmer »

I'm assuming you obviously have a scan of the wall in it's original state and then at a second later period in time.

I would try getting both scans into the same co-ordinate system, set the active ref plane behind the face of the wall, create a TIN mesh of each, Go to tools / Measure / Surface Deviation.....create points at suitable intervals for the accuracy / complexity of the mesh you are trying to achieve. Then select the newly create points and create a TIN of those to give you a DTM of the surface deviation with colours referenced to the active reference plane. If that is no good I would probably try GeoMagic.
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Re: Wall deformation analysis workflow

Post by Phill »

Hey

Check this post as well to save me some explaining. If you are only doing one scan and its deviations set your coordinate system to the wall, change the up direction to the appropriate axis and colour by elevation. If you have 2 scans take two images and compare the 2 using arc.

http://www.laserscanningforum.com/forum ... eformation

Cheers

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Re: Wall deformation analysis workflow

Post by mariusP »

http://www.laserscanningforum.com/forum ... =56&t=5441

If you are using AutoCAD you can try this one ;)
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Re: Wall deformation analysis workflow

Post by Phil Marsh »

I would use something like 3DReshaper or Geomagic as these program's can mesh in full 3D and not just the Z direction.
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Re: Wall deformation analysis workflow

Post by dlague »

you could use cloudcompare (free and far better for this task than Cyclone) : mesh one of your survey (the first one), and then do a point to mesh comparison. Fastest way to get relatively good results and visualisation.

And for extreme accuracy, it's better not to mesh the data at all but use directly the point clouds (no loss of precision). We have developped a software that do so and also give you confidence intervals for each point according to the registration error and the roughness of the point cloud (which might come from scanner noise or actual wall roughness). There's no visual interface, it's command line (we use Cloudcompare for visualizing the results). I'm long overdue on the tutorial and manual (should be out before the end of september), but you can try it yourselft as it's free and relatively simple. Check my website: http://www.geosciences.univ-rennes1.fr/ ... 25&lang=fr and go down to M3C2 and download the point cloud comparison package.zip.

A quick overview of the algorithm applied to a complex case is given here:
http://nicolas.brodu.net/en/recherche/m3c2/index.html

Basically:
. you make sure that your two surveys are registered together as accurately as possible.
. you export the two points clouds corresponding to the two surveys in .xyz
. you run the batch file using the M3C2 algorithm (no mesh, no grid, works in 3D)
. you display your results in Cloudcompare... and voila

If you're interested I can give you the parameters you should use depending on your scan resolution and wall size as your case is straightforward.
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Re: Wall deformation analysis workflow

Post by laserg »

dlague wrote: Mon Sep 09, 2013 9:26 pm you could use cloudcompare (free and far better for this task than Cyclone) : mesh one of your survey (the first one), and then do a point to mesh comparison. Fastest way to get relatively good results and visualisation.

And for extreme accuracy, it's better not to mesh the data at all but use directly the point clouds (no loss of precision). We have developped a software that do so and also give you confidence intervals for each point according to the registration error and the roughness of the point cloud (which might come from scanner noise or actual wall roughness). There's no visual interface, it's command line (we use Cloudcompare for visualizing the results). I'm long overdue on the tutorial and manual (should be out before the end of september), but you can try it yourselft as it's free and relatively simple. Check my website: http://www.geosciences.univ-rennes1.fr/ ... 25&lang=fr and go down to M3C2 and download the point cloud comparison package.zip.

A quick overview of the algorithm applied to a complex case is given here:
http://nicolas.brodu.net/en/recherche/m3c2/index.html

Basically:
. you make sure that your two surveys are registered together as accurately as possible.
. you export the two points clouds corresponding to the two surveys in .xyz
. you run the batch file using the M3C2 algorithm (no mesh, no grid, works in 3D)
. you display your results in Cloudcompare... and voila

If you're interested I can give you the parameters you should use depending on your scan resolution and wall size as your case is straightforward.
Could you repost the command line?
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