CloudCompare forum

Posted: **Tue Nov 21, 2017 7:01 pm**

daniel wrote:Hum, with the E57 files, I can't reproduce the issue. I get the same result in the GUI and the command line mode.
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CloudCompare.exe -silent -auto_save off -O Compared_201701031_Outside.e57 -O Reference_201701027_Outside.e57 -C2C_DIST -max_dist 0.5 -C_EXPORT_FMT E57 -no_timestamp -save_clouds
I guess the issue do come from the LAS files. Can you send them to me?

Note: regarding your command line, it would be more efficient to use the '-C_EXPORT_FMT E57 -no_timestamp' options before the -C2C_DIST option, and remove the '-auto_save off' and '-save_clouds' options. This way you'll get only one file (the compared cloud). Apart if you want both files as E57 files of course ;)

Hey Daniel, sorry it took so long. I have uploaded the LAS files to that same Dropbox folder. From more testing with 2.9.1 command line, I've learned the following:

Any number of uses of Global_shift AUTO breaks the cloud-to-cloud comparison when using LAS files

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CloudCompare.exe -silent -O -GLOBAL_SHIFT AUTO Compared_201701031_Outside.las -O -GLOBAL_SHIFT AUTO Reference_201701027_Outside.las -C_EXPORT_FMT E57 -no_timestamp -C2C_DIST -max_dist 0.5

Or

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CloudCompare.exe -silent -O -GLOBAL_SHIFT AUTO Compared_201701031_Outside.las -O Reference_201701027_Outside.las -C_EXPORT_FMT E57 -no_timestamp -C2C_DIST -max_dist 0.5

Or

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CloudCompare.exe -silent -O Compared_201701031_Outside.las -O -GLOBAL_SHIFT AUTO Reference_201701027_Outside.las -C_EXPORT_FMT E57 -no_timestamp -C2C_DIST -max_dist 0.5

Using default Global Shift & Scale triggering limits, cloud-to-cloud comparison works fine LAS files

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CloudCompare.exe -silent -O Compared_201701031_Outside.las -O Reference_201701027_Outside.las -C_EXPORT_FMT E57 -no_timestamp -C2C_DIST -max_dist 0.5

I have used the following Global Shift & Scale triggering limits, which I believe are the default on a clean install:

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Max absolute coordinate: 10^6
Max entity diagonal: 10^4

Posted: **Thu Nov 23, 2017 6:18 pm**

Indeed, it seems that when dealing with LAS files, the 'Auto' global scale is not that smart. I'll have to fix this.

Meanwhile, I think an easy solution in your case is to set the global shift manually to (0, 0, 0):

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-GLOBAL_SHIFT 0 0 0

You shouldn't have any accuracy issue as you deal with TLS clouds. And the LAS shift (which is used by CC as a default Global Shift for LAS files) is very small in the examples you sent me.

Posted: **Thu Nov 23, 2017 9:11 pm**

Ok, it's fixed in the code (it will be available in the next release). Meanwhile a (0, 0, 0) global shift should do the trick.

Posted: **Thu Nov 23, 2017 9:11 pm**

Ok, it's fixed in the code (it will be available in the next release). Meanwhile a (0, 0, 0) global shift should do the trick.

Posted: **Fri Dec 15, 2017 4:06 pm**

For the records the online 2.10.alpha version has just been updated.

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