CASCADE module (Linux)

[19yc93]

Hello,

I am not able to compile the CASCADE module in Ubuntu 16.04 LTS. I have two questions:

• Which Version of Open CASCADE will work?

Should I use the Community Edition (OCE) or the official Edition (OCCT)?

And which Version of these will work?

• Where are the directories?

I always got an error in make configuration:

Cannot find OpenCASCADE directories.

OpenCASCADE include directory:

OpenCASCADE library directory:

OpenCASCADE libraries:

In cmake I have to set up these values:

CH_CASCADE_DIR

CH_CASCADE_INCLUDES

My problem is that I don`t know if the error occurs because I installed the wrong version or if I am not able to find the directories (I tried like everything).

I would really appreciate any help.

Thanks

[Alessandro Tasora]

hi

I am successfully using the official OCCT version 6.9.0, here it works.

My CMake settings (example for my system, on Windows 64 bit):

CH_CASCADE_DIR         D:/OpenCASCADE6.9.0/opencascade-6.9.0
CH_CASCADE_LIBDIR   D:/OpenCASCADE6.9.0/opencascade-6.9.0/win64/vc10/lib
...

(I do not have CH_CASCADE_INCLUDES, are you using the latest Chrono from develop branch?)

Alessandro

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[19yc93]

Am Freitag, 20. Juli 2018 15:50:28 UTC+2 schrieb Alessandro Tasora:

(I do not have CH_CASCADE_INCLUDES, are you using the latest Chrono from develop branch?)

No, I'm using the master version. It's definitly CH_CASCADE_INCLUDES.

I also checked the "Advanced" option in the cmake GUI, but there is no CH_CASCADE_LIBDIR.

[Radu Serban]

The difference is that Alessandro is configuring and building the Chrono::Cascade module on Windows, while 19yc93 is working in Ubuntu.

I do not have access to an Ubuntu 16.04 LTS box, but I tried to configure and build the Cascade module on a Linux cluster node (CentOS 7.4.1708).  For this, I built OpenCascade OCCT 6.9.1 from source, using their CMake-based build system.  I configured it to created shared libraries.  Note that Chrono::Cascade is not compatible with the latest release (OCCT 7.3.0) due to some changes in the OC headers.

The Chrono CMakeLists.txt in src/chrono_cascade needs to be improved (especially for building in Linux).  I'll look into this when I find some time.  For now, I had to make a small modification, by defining the CMake variable CH_CASCADE_LIBDIR regardless of platform.  In other words, move line 48:
    SET(CH_CASCADE_LIBDIR "" CACHE PATH "Path to the OpenCASCADE library directory.")
outside the 'if' construct (say, at line 46).

With this, during configuration, all I had to do was set CH_CASCADE_INCLUDES to point to the directory in the OC installation that contains all header files and set CH_CASCADE_LIBDIR to the directory that contains all OC shared libraries.  In my case:
--   OpenCASCADE include directory: /srv/home/serban/Packages/opencascade/inc
--   OpenCASCADE library directory: /srv/home/serban/Packages/opencascade/lin64/gcc/lib

With this, I was able to build Chrono::Cascade.

--Radu

[justin.l.r...@wmich.edu]

Radu,

Can you tell me what libraries you used?

I'm using:

freetype-2.4.11

tcl8.5.19

tk8.5.19

and 

opencascade-6.9.1

When I run ./demo_CAS_stepfile I get a Segmentation fault (core dumped) error attached.

Or when I run a model using (that worked before adding cascade):

I the Cmakelists.txt file I have:

find_package(Chrono

             COMPONENTS Postprocess Cascade

             CONFIG)

and in the my_example file I have:

using namespace cascade;

I get a naming error, also attached. 

Thanks in advance,

Justin

[Radu Serban]

Justin,

I used the same library versions as you, except that tcl and tk were at 8.5.13.

I cannot reproduce the segmentation fault; could you please run this through a debugger and find out where the crash occurs?

Finally, the "not a namespace-name" error is because you didn't include some necessary header.

--Radu

[Alessandro Tasora]

By the way: there is also the OCE 'community' Open Cascade distribution, that comes with precompiled binaries for most platforms. I just tested the 0.18.3 version (derived from 6.9). It works fine here in Windows, I do not know for Linux. You can install OCE easily by using Anaconda or Miniconda.

Alessandro Tasora

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[justin.l.r...@wmich.edu]

I wanted to thank you both, I did get it to work on both systems I used. 

For anyone reading this in the future, here is what I got to work:

Ubuntu, 18.04.1 LTS (Bionic Beaver), Mate:

I did use a community edition per Alessandro recommendation.

I used OCE release 0.18.3

I still do not know why compiling packages separately did/does not work, surely something on my end.

CentOS release 6.4 (Final) (a supercomputer):

opencascade-6.9.1

freetype-2.4.11

tcl8.5.19

tk8.5.19     (Note tcl and tk must be installed in the same install directory)

I actually had this compiled just find, but as Radu pointed out, I was missing the header files. E.g.,:

#include "chrono_cascade/ChBodyEasyCascade.h"                 

#include "chrono_cascade/ChCascadeDoc.h"

#include "chrono_cascade/ChCascadeShapeAsset.h"