CGAL users discussion list

[Maxime Gimeno <>]

 - You create the target dsm twice, it is an error. Remove the last one.

- replace the last two lines with 

target_link_libraries(dsm PUBLIC CGAL::CGAL ${CGAL_libs} CGAL::LASLIB_support)

And more important :

CGAL::make_las_point_reader(points.point_map()))

is wrong. It should only be points.point_map()

Le jeu. 24 sept. 2020 à 22:03, Himanshu Sharma <> a écrit :

Thanks for the help so far. Really appreciate it.

I tried finding how to link imports from another cmake file to the executable, however not succesful so far.

Is there a page which has more details with preferably with an example on how to use optional third party libraries with CGAL which includes import from another cmake. 

I guess this is more of a CMake question, so apologies for posting it here.

Regards

Himanshu

---

From: <> on behalf of Andreas Fabri <>
Sent: Thursday, September 24, 2020 12:17 PM
To: <>
Subject: Re: [cgal-discuss] Reading a las file.

 

As Maxime wrote:  Have a look here : https://doc.cgal.org/latest/Manual/thirdparty.html#thirdpartyLASlib

On 9/24/2020 6:09 PM, Himanshu Sharma ( via cgal-discuss Mailing List) wrote:

I am using a Mac, and even compinling read_las_example.cpp fails citing 

CMake Error at CMakeLists.txt:63 (include):

  include could not find load file:

    CGAL_LASLIB_support

Are there dependencies I need to install ?

Regards

Himanshu

---

From: on behalf of Himanshu Sharma
Sent: Thursday, September 24, 2020 11:22 AM
To:
Subject: Re: [cgal-discuss] Reading a las file.

 

Tried, didn't work.

Also, sorry for changing the track in between, but can you guide with the 5.1 version ?

Regards,
Himanshu

---

From: on behalf of Maxime Gimeno
Sent: Thursday, September 24, 2020 11:14 AM
To:
Subject: Re: [cgal-discuss] Reading a las file.

 

Can you try with PUBLIC instead?

Le jeu. 24 sept. 2020 à 17:11, Himanshu Sharma <> a écrit :

No particular reason. I used  cgal_create_CMakeLists to generate CMakeLists.txt and that was the default.

---

From: <> on behalf of Maxime Gimeno <>
Sent: Thursday, September 24, 2020 11:06 AM
To: <>
Subject: Re: [cgal-discuss] Reading a las file.

 

Why do you link privately with CGAL ? Why not target_link_library(dsm PUBLIC CGAL) ? 

Le jeu. 24 sept. 2020 à 17:00, Himanshu Sharma <> a écrit :

Yes, I did that.

I also tried with CGAL 5.1 just now. I am attaching the CMakeLists.txt for 5.1. For this, it is unable to find CGAL_LASLIB_support. Can you help with this as well

include could not find load file:

    CGAL_LASLIB_support

---

From: <> on behalf of Maxime Gimeno <>
Sent: Thursday, September 24, 2020 10:50 AM
To: <>
Subject: Re: [cgal-discuss] Reading a las file.

 

Did you include <CGAL/IO/read_las_points.h> ?

Le jeu. 24 sept. 2020 à 16:44, Himanshu Sharma <> a écrit :

Sorry, I am using 5.0 i meant.

---

From: Himanshu Sharma <>
Sent: Thursday, September 24, 2020 10:44 AM
To: <>
Subject: Re: [cgal-discuss] Reading a las file.

 

I am using 5.1

It is NOTICE : the LAS reader found.

Regards,
Himanshu

---

From: <> on behalf of Maxime Gimeno <>
Sent: Thursday, September 24, 2020 10:21 AM
To: <>
Subject: Re: [cgal-discuss] Reading a las file.

 

Actually it depends on your version of CGAL. <5.1, your code is probably right, if LASLIB_FOUND is TRUE. What is your CMAKE output during configuration ?

NOTICE : the LAS reader found.

or

NOTICE : the LAS reader test requires LASlib and will not be compiled.

?

Le jeu. 24 sept. 2020 à 16:11, Himanshu Sharma <> a écrit :

I see. I have attached the CMakeLists.txt along.

I tried to follow CMakeLists.txt of read_las_example from Point_set_processing_3, but didnt get it right it seems.

Regards

Himanshu

---

From: <> on behalf of Maxime Gimeno <>
Sent: Thursday, September 24, 2020 2:13 AM
To: <>
Subject: Re: [cgal-discuss] Reading a las file.

 

Hello,

It looks like you did not link with LAS. Can you provide your CMakeLists.txt ? You must have forgotten to link with the target CGAL::LASLIB_support. Have a look here : https://doc.cgal.org/latest/Manual/thirdparty.html#thirdpartyLASlib

Le jeu. 24 sept. 2020 à 05:27, Himanshu Sharma <> a écrit :

Hello,

I am trying to read a .las file into Point_set_3. Below is the code snippent. However this throws following error:

error: no matching function for call to 'make_las_point_reader.

I am not sure what goes wrong here. I understand that the argument to the make_las_point_reader is not of the right type.

 

std::ifstream ifile (argv[1], std::ios_base::binary);

  CGAL::Point_set_3<Point_3> points;

  if (!CGAL::read_las_points

      (ifile,

       points.index_back_inserter(),

       CGAL::make_las_point_reader(points.point_map())))

    {

      std::cerr << "Error: cannot read file " << argv[1] << std::endl;

      return EXIT_FAILURE;

    }

Regards

Himanshu

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Andreas Fabri, PhD
Chief Officer, GeometryFactory
Editor, The CGAL Project

phone: +33.492.954.912    skype: andreas.fabri

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