CloudCompare forum

Hello Daniel,
is it or would it be possible to implement a combination of the two tools? I want to clip a point cloud based on a given surface (list of coordinates or polygon). If no, do you have an idea, how it could do that manually?
Regards
Thomas

You mean you want to clip all the points along one direction that fall within a polygon defined in a plane orthogonal to this direction?

Then your only friend might be the '-CROP2D' command line option (see https://www.cloudcompare.org/doc/wiki/i ... _line_mode). You'll have first to reorient the cloud so that the polygon can be described only in 2D).

Exactly, I want to cut out all points in a certain polygon considering a normal vector in the orthogonal direction (e.g. 10cm). That is, in a volume of interest = polygon * normal vector.
So yes.

Stupdi question, could not find the answer, but how do I start the command line mode? Unfortunately, I cannot make any entries in the console.

Ah, will try: https://www.danielgm.net/cc/forum/viewtopic.php?t=1176

Hi Daniel,

the function -CROP2D {ortho_dim} {n:number of vertices} X1 Y1 X2 Y2 ... Xn Yn is explained as follows:

Crops all loaded clouds inside or outisde a given 2D polyline. Cropping is done in a plane defined by its orthogonal dimension: X, Y or Z (i.e. coordinates along this dimension will be ignored).
Optional settings are:

• OUTSIDE: if defined only the points falling outside the input polyline will be kept (instead of inside by default).

Note:

• result is automatically saved by default (see the AUTO_SAVE command to change this)
  each

• cloud will be replaced in memory by its cropped version

Am I able to define the length of the cropped direction? For example 0.1m?

Would it be possible to import a polyline into CloudCompare GUI? Then I also could use the scissors tool. I'd only need to define the orthogonal direction.

So, no, you can't define the depth with CROP2D, it's an 'infinite' crop.

And yes, you can easily import a polyline as .poly file (it's a text file, with the X Y Z coordinates of each vertex per line).

Is it possible to import the poly file with the GUI?

Yes, .poly files can be imported in the GUI version.

Thanks. Did work!