Surface analysis export

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Nicolas_3SReshaper
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Re: Surface analysis export

Post by Nicolas_3SReshaper » Fri Apr 06, 2018 10:14 am

lastools wrote:
Wed Apr 04, 2018 4:06 pm
Hello from @rapidlasso,

I'm curious how this "deviation value" is stored to LAS/LAZ. Does it use the ability to export additional per point attributes as "extra bytes"? I'd be interested to see a lasinfo report of such an 3DReshaper 2017MR1 export.
gilles_3Dreshaper wrote:
Mon Feb 26, 2018 1:13 pm
the latest version of 3DReshaper 2017MR1 can export to LAZ (including deviation value)
Regards,

Martin
Hello Martin,
Actually we don't use extra bytes, but we simply rescale the intensity value from mix-max to 0-65535 and store it in the intensity field.
Can you tell me more about "extra-bytes" and how to use it ?

a report from lasinfo looks like this

Code: Select all

reporting all LAS header entries:
  file signature:             'LASF'
  file source ID:             0
  global_encoding:            0
  project ID GUID data 1-4:   00000000-0000-0000-0000-000000000000
  version major.minor:        1.2
  system identifier:          'OTHER'
  generating software:        'LASzip DLL 3.1 r0 (170823)'
  file creation day/year:     94/118
  header size:                227
  offset to point data:       227
  number var. length records: 0
  point data format:          2
  point data record length:   26
  number of point records:    1534441
  number of points by return: 0 0 0 0 0
  scale factor x y z:         0.000000006986644 0.000000004621128 0.000000000057163
  offset x y z:               22.233017700524346 -6.552022093381471 0.024382942594183
  min x y z:                  8.259729507834008 -15.7942782991655 -0.089942316291099
  max x y z:                  36.206305893214683 2.690234112402559 0.138708201479465
LASzip compression (version 3.1r0 c2 50000): POINT10 2 RGB12 2
reporting minimum and maximum for all LAS point record entries ...
  X          -2000000000 2000000000
  Y          -2000000000 2000000000
  Z          -2000000000 2000000000
  intensity           0      65535
  return_number       1          1
  number_of_returns   1          1
  edge_of_flight_line 0          0
  scan_direction_flag 0          0
  classification      0          0
  scan_angle_rank     0          0
  user_data           0          0
  point_source_ID     0          0
  Color R 0 65535
        G 1542 65535
        B 0 65535
number of first returns:        1534441
number of intermediate returns: 0
number of last returns:         1534441
number of single returns:       1534441
WARNING: for return 1 real number of points by return is 1534441 but header entry was not set.
overview over number of returns of given pulse: 1534441 0 0 0 0 0 0
histogram of classification of points:
         1534441  never classified (0)
Nicolas Mocellin
3DReshaper Product Manager
www.3dreshaper.com

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RobM
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Re: Surface analysis export

Post by RobM » Fri Apr 06, 2018 10:43 am

I've tested 3DReshaper a while ago and really liked its behaviour and handling. Especially the filtering tools are great!

Whats been missing for me with pretty much all of the available software is to be able to get and create rasterdata on the surfaces.
Pointsense is able to do that, but is not able to make the heatmap anymore (sadly). I think this has stopped with AutoCAD 2015.
It used to look like this:

Image

If 3DReshaper would add this feature this would be a major buying point for me. A lot of clients ask for this kind of report, as they can work with the given values really well.

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Re: Surface analysis export

Post by gilles_3Dreshaper » Fri Apr 06, 2018 2:31 pm

Hi Robin,
From the rendering point of view, sounds like 3DReshaper offers something very close to what you are looking for!
See image below
Facade.PNG
This is called a "grid" in 3DReshaper.
You can activate a grid by hitting the icon on the bottom right of 3DR (activated in the image below - in orange!).
There are several options to grids:
  • Direction of the grid: in X, Y or Z or AUTO (closest to the current view)
  • Steps of the grid
  • Display of the text
Grid.PNG
It is also possible to create rasterdata on a mesh.
This function is called "Grid Projection" in the cloud menu.
In uses the Z direction to project points on a mesh (planar mesh I guess here). This means you will have to create a UCS with Z pointing perpendicularly to the facade.
The output is a point cloud which you can compare to/inspect against the facade.
In the compare/inspect dialog, you can ask for a csv report with all deviations.

Hope this helps!
Do not hesitate to ask more!
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Gilles
3DReshaper Application Manager
http://www.3dreshaper.com

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gilles_3Dreshaper
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Re: Surface analysis export

Post by gilles_3Dreshaper » Fri Apr 06, 2018 2:42 pm

Hi,
Here is a small zip file containing a LAS and a LAZ file exported from 3DReshaper.
LAS+LAZ.zip
Let me know what your findings are about the lasinfo report.

To export a LAS (or LAZ) file in 3DReshaper, just select the point cloud, go to File / Export / Export Selected Cloud(s) and choose the right extension!
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Gilles
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Re: Surface analysis export

Post by RobM » Fri Apr 06, 2018 5:20 pm

Hi Gilles,

thank you for your input. That looks really close to what I mentioned.
Unfortunatelly I can't test it myself, as I don't have 3DReshaper (only had a trial about a year ago). But this info might help others!
Also I might get another trial in the future if I have some money to spend on new software ;-)

//edit

is it possible to write the deviation values onto the grid like shown in my example? you can't really tell by the picture i postet, but all the little red marks are text

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