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Re: Point cloud accuracy loss after applying transformation matrix
Posted: Thu Feb 16, 2023 3:11 pm
by cragoras
Hey, i just tried it at home with v2.12.4 and the same error occured. Doesnt seem like its fixed.
Re: Point cloud accuracy loss after applying transformation matrix
Posted: Sat Feb 18, 2023 9:08 am
by daniel
Could you send me a very small section of your original point cloud? (Just crop the cloud around your target for instance, and you can share it with me as a LAS file to admin[at]cloudcompare.org). Thanks.
Re: Point cloud accuracy loss after applying transformation matrix
Posted: Sat Feb 25, 2023 7:47 pm
by daniel
Ok, as discussed by email, the issue was that you were expecting to apply the transformation matrix to the global coordinates, while it was applied by default to the local/shifted coordinates.
The latest 2.13.alpha version now offers a 'Apply to global coordinates' checkbox in the 'Apply Transformation' tool.
Re: Point cloud accuracy loss after applying transformation matrix
Posted: Wed Jun 21, 2023 1:00 pm
by Mehdimd
Hello,
I am having the same issue, using the following transformation matrix:
0.96950086 0.26035895 -0.00356198 2540458.0100779
-0.26457433 0.96467088 -0.00097105 1154762.30123829
0.00318332 0.00188384 1.00413354 54.43521782
0. 0. 0. 1.
I tried to remove the translation part ([2540458.0100779 ; - 1154762.30123829 ; 54.43521782]) due to the huge numbers, and the accuracy was fine.
But I need the translation, therefore it is still an issue for me.
Any information regarding this? Thanks in advance
Re: Point cloud accuracy loss after applying transformation matrix
Posted: Fri Jun 23, 2023 5:42 pm
by daniel
Have you tried this with the latest 2.13.alpha version? (on Windows only for now, but soon available with Flatpak as well on Linux)
Re: Point cloud accuracy loss after applying transformation matrix
Posted: Wed Jun 28, 2023 12:07 pm
by Mehdimd
Yes I use the 24/06/2023 alpha version of CloudCompare on Windows. I have the same issue when just importing a point cloud with high value coordinates.
https://ibb.co/CVLP3jm
If this is not solvable, do you recommend any other workflow to be able to deal with those georeferenced point clouds in CloudCompare?
Thanks a lot for your reactivity