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christopherpoole / CADMesh

A CAD file interface for GEANT4
MIT License
146 stars 66 forks source link

Have the example/s compile when the library is compiled, and provide a template project. #5

Closed cereus93 closed 7 years ago

cereus93 commented 9 years ago

Hi, I would like to use CADMesh 1.0.rc4 together with geant4 10.01. Geant4 works fine and also building and installation of CADMesh, but I can not execute the basic CADMesh example. When I run the example I get a segementation fault (core dumped) in the function CADMesh::TesselatedMesh(int) in libcadmesh.so.

I have no ideas what to do. It would be nice to get a hint.

I am using:

SimonBiggs commented 9 years ago

It's been a while since I have fiddled with this, but if I remember correctly everything seemed to work a lot smoother when I used GEANT4 9.6. See what Chris thinks.

christopherpoole commented 9 years ago

@cereus93 With regards to the example, is is most likely due to the path to the CAD file being hard-coded. Try running it one level up from the build directory:

./build/cadmesh_example

I have been meaning to fix this by specifying the path to the CAD file on the command line.

christopherpoole commented 9 years ago

@cereus93 I have just made a for you to try. The example now takes the CAD filename on the command line. Give it a try and let me know how it goes.

cereus93 commented 9 years ago

Thanks for your help! With using ./build/cadmesh_example everything works fine in version CADMesh-1.0.rc4.

Version CADMesh-1.0.rc5 is a good improvement, but if you want to build the example you get an error message, because cadmesh can not be found. To solve this you have to do changes in the CMakeList.txt.

find_package(cadmesh) include_directories(${CADMESH_INCLUDE_DIRS})

and

target_link_libraries(cadmesh_example ${cadmesh_LIBRARIES})

are there as comments but the lines are needed to build the example. If the CMakeList.txt is changed everything works fine.

stevenwalton commented 8 years ago

Since this is not closed I am going to make explicit of what should be done.

The CMakeList.txt needs to be changed to

cmake_minimum_required(VERSION 2.6 FATAL_ERROR)
project(cadmesh_example)

# GEANT4 core
find_package(Geant4 REQUIRED ui_all vis_all)
include(${Geant4_USE_FILE})
include_directories(${PROJECT_SOURCE_DIR}/include)

# Include CADMesh in your project.
find_package(cadmesh)
include_directories(${CADMESH_INCLUDE_DIRS})

# User code
file(GLOB sources ${PROJECT_SOURCE_DIR}/src/*.cc)
file(GLOB headers ${PROJECT_SOURCE_DIR}/include/*.hh)

add_executable(cadmesh_example cadmesh_example.cc ${sources} ${headers})
target_link_libraries(cadmesh_example ${Geant4_LIBRARIES})

target_link_libraries(cadmesh_example cadmesh)
target_link_libraries(cadmesh_example ${cadmesh_LIBRARIES})

And then the user needs to run from $CADMesh/examples/basic/build

cmake .. -Dcadmesh_DIR:PATH=$CADMeshInstall/lib/cmake/cadmesh-./ 
make -j<number of processors>

Your cmake file will not automatically find the lib/cmake/cadmesh-. folder even if the library is exported correctly.

Fixing the CMakeLists.txt and changing the path name in the example given in the README.md should close and solve this.

christopherpoole commented 8 years ago

Thanks @stevenwalton. The root of the problem seems to be the original intent of the example to be compilable without having to install CADMesh, and also server as an example project once it has been installed.

What I will do is: