Decimate files

[Albion Shabani]

Hello everybody,

Is there any LAStools that can decimate  las,laz,e57,ply  files ?

For exemple like CLOUDCOMPARE: "C:\Program Files\CloudCompare\CloudCompare.exe" -o C:\Users\Administrator\Desktop\bunny.las -SS SPATIAL 0.005 -C_EXPORT_FMT LAS -SAVE_CLOUDS FILE decimated/bunny.las

Since we have some large files with lots of points, we would like to remove some of the points randomly.

Best regards,

Albion

[Martin Isenburg]

Hello,

here some simple way to decimate the bunny by simply keeping only a pseudo-random fraction of points. Not the best way of point decimation as it's not feature or anything else preserving.

lasview -i bunny.laz -kamera 0 -72.2 150 0.024 -0.08 2.5 -point_size 5
lasview -i bunny.laz -kamera 0 -72.2 150 0.024 -0.08 2.5 -point_size 5 -keep_random_fraction 0.5
lasview -i bunny.laz -kamera 0 -72.2 150 0.024 -0.08 2.5 -point_size 5 -keep_random_fraction 0.2
lasview -i bunny.laz -kamera 0 -72.2 150 0.024 -0.08 2.5 -point_size 5 -keep_random_fraction 0.1

Regards,

Martin

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[Martin Isenburg]

Hello,

the bunny model is attached as a LAZ file. It can also be used to play around with the spike-free algorithm to avoid the different surface that overlap in z direction from be triangulated together,

The spike-free version of the bunny was created with

lasview -i bunny.laz -spike_free 0.004 0.001 0.002

just repeatedly press <y> for an interactive visualizaiton of the spike-free algorithm. Press <Y> to run the spike-free algorithm to the end.

Regards,

Martin