Writing a scene in cpp fails

I have the following folders in examples/Tutorials/ folder:

Basic
Collision
ForceFields
Mappings
OldTutorials
sandbox
Solvers
StepByStep
Topologies

But none of them seem to contain any cpp files.

I do understand how to create a simple scene using XML and to solve it. But how do I do the same using cpp?

Best,
Agniv.

Hi,

I have tried to build the demo scene. Here’s what I do:

I have the following directory structure:

sofa_scene
|
+—>build/
|
+—>CMakeLists.txt
|
+—>Main.cpp

The Main.cpp is an exact copy from the tutorial.

The CMakeLists.txt contains:

cmake_minimum_required(VERSION 3.1)
project(sofa_scene)

find_package(SofaFramework REQUIRED)
find_package(SofaComponentCommon)

add_executable(${PROJECT_NAME} Main.cpp)
target_link_libraries(${PROJECT_NAME} SofaFramework SofaComponentCommon)

When I run cmake .. from the build directory, I get:

CMake Error at CMakeLists.txt:4 (find_package):
  By not providing "FindSofaFramework.cmake" in CMAKE_MODULE_PATH this
  project has asked CMake to find a package configuration file provided by
  "SofaFramework", but CMake did not find one.

  Could not find a package configuration file provided by "SofaFramework"
  with any of the following names:

    SofaFrameworkConfig.cmake
    sofaframework-config.cmake

  Add the installation prefix of "SofaFramework" to CMAKE_PREFIX_PATH or set
  "SofaFramework_DIR" to a directory containing one of the above files.  If
  "SofaFramework" provides a separate development package or SDK, be sure it
  has been installed.

-- Configuring incomplete, errors occurred!
See also "sofa_scene/build/CMakeFiles/CMakeOutput.log".

Again, not sure what is happening here. Please help.

Best Regards,
Agniv.

How do I do that? I tried setting SofaFramework_DIR to the build path, but that did not work.

So I change the Cmake file to:

cmake_minimum_required(VERSION 3.1)
project(Sofa)

set(SofaFramework_DIR "/path/to/sofa/build/")

find_package(SofaFramework REQUIRED)
find_package(SofaComponentCommon)

add_executable(${PROJECT_NAME} Main.cpp)
target_link_libraries(${PROJECT_NAME} SofaFramework SofaComponentCommon)

This still does not work!

I changed the cmake file to:

cmake_minimum_required(VERSION 3.1)
project(Sofa)

set(SofaFramework_DIR "/path/to/sofa/build/cmake/")

find_package(SofaFramework REQUIRED)
find_package(SofaComponentCommon)

add_executable(${PROJECT_NAME} Main.cpp)
target_link_libraries(${PROJECT_NAME} SofaFramework SofaComponentCommon)

Looks like that worked! But now I get a different error:

CMake Error at /home/agniv/Code/sofa/build/cmake/SofaFrameworkConfig.cmake:36 (find_package):
  By not providing "FindTinyXML.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "TinyXML", but
  CMake did not find one.

  Could not find a package configuration file provided by "TinyXML" with any
  of the following names:

    TinyXMLConfig.cmake
    tinyxml-config.cmake

  Add the installation prefix of "TinyXML" to CMAKE_PREFIX_PATH or set
  "TinyXML_DIR" to a directory containing one of the above files.  If
  "TinyXML" provides a separate development package or SDK, be sure it has
  been installed.
Call Stack (most recent call first):
  CMakeLists.txt:6 (find_package)

-- Configuring incomplete, errors occurred!
See also "/home/agniv/Code/sofa_scene/build/CMakeFiles/CMakeOutput.log".
Makefile:176: recipe for target 'cmake_check_build_system' failed
make: *** [cmake_check_build_system] Error 1

But I had installed SOFA using TinyXML.

If I link it with just SofaComponentCommon, I get a different output:

CMake Warning at CMakeLists.txt:7 (find_package):
  By not providing "FindSofaComponentCommon.cmake" in CMAKE_MODULE_PATH this
  project has asked CMake to find a package configuration file provided by
  "SofaComponentCommon", but CMake did not find one.

  Could not find a package configuration file provided by
  "SofaComponentCommon" with any of the following names:

    SofaComponentCommonConfig.cmake
    sofacomponentcommon-config.cmake

  Add the installation prefix of "SofaComponentCommon" to CMAKE_PREFIX_PATH
  or set "SofaComponentCommon_DIR" to a directory containing one of the above
  files.  If "SofaComponentCommon" provides a separate development package or
  SDK, be sure it has been installed.

-- Configuring done
-- Generating done
-- Build files have been written to: /path/to/sofa_scene/build

I tried doing make with this output. It does not compile, I get the error message:

[ 50%] Building CXX object CMakeFiles/Sofa.dir/Main.cpp.o
/path/to/sofa_scene/Main.cpp:5:10: fatal error: sofa/helper/ArgumentParser.h: No such file or directory
 #include <sofa/helper/ArgumentParser.h>
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
CMakeFiles/Sofa.dir/build.make:62: recipe for target 'CMakeFiles/Sofa.dir/Main.cpp.o' failed
make[2]: *** [CMakeFiles/Sofa.dir/Main.cpp.o] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/Sofa.dir/all' failed
make[1]: *** [CMakeFiles/Sofa.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2

The same code as given in: the demo.

I do not want Main.cpp to do much, as of now. I just want it to compile with full functionality, so that I can play around with it, and eventually do a FEM simulation of sorts.

Hi,

My CMakeLists.txt, in the SOFA scene project, now reads:

cmake_minimum_required(VERSION 3.1)
project(Sofa)

set(CMAKE_PREFIX_PATH "/path/to/sofa/build/install/lib/cmake")

find_package(SofaComponentCommon)

add_executable(${PROJECT_NAME} Main.cpp)
target_link_libraries(${PROJECT_NAME} SofaComponentCommon)

I ran make and sudo make install in the SOFA build directory already.

The folder in /path/to/sofa/build/install/lib/cmake contains the following sub-directories:

CImg
CImgPlugin
CSparse
GTest
Newmat
QGLViewer
SceneCreator
SofaAdvanced
SofaBase
SofaCommon
SofaFramework
SofaGeneral
SofaGTestMain
SofaGui
SofaMisc
SofaMiscCollision
SofaPython
SofaSimulation
SofaTest
TinyXML

However, when I run cmake .. in the build directory of the SOFA scene demo project, I see the following output:

-- The C compiler identification is GNU 7.2.0                                                         
-- The CXX compiler identification is GNU 7.2.0    
-- Check for working C compiler: /usr/bin/cc       
-- Check for working C compiler: /usr/bin/cc -- works                                                 
-- Detecting C compiler ABI info                                                                      
-- Detecting C compiler ABI info - done                                                               
-- Detecting C compile features                                                                       
-- Detecting C compile features - done             
-- Check for working CXX compiler: /usr/bin/c++    
-- Check for working CXX compiler: /usr/bin/c++ -- works                                              
-- Detecting CXX compiler ABI info                 
-- Detecting CXX compiler ABI info - done          
-- Detecting CXX compile features                  
-- Detecting CXX compile features - done           
CMake Warning at CMakeLists.txt:9 (find_package):  
  By not providing "FindSofaComponentCommon.cmake" in CMAKE_MODULE_PATH this                          
  project has asked CMake to find a package configuration file provided by                            
  "SofaComponentCommon", but CMake did not find one.                                                  

  Could not find a package configuration file provided by                                             
  "SofaComponentCommon" with any of the following names:                                              

    SofaComponentCommonConfig.cmake                
    sofacomponentcommon-config.cmake               

  Add the installation prefix of "SofaComponentCommon" to CMAKE_PREFIX_PATH                           
  or set "SofaComponentCommon_DIR" to a directory containing one of the above                         
  files.  If "SofaComponentCommon" provides a separate development package or                         
  SDK, be sure it has been installed.              

-- Configuring done                                
-- Generating done                                 
-- Build files have been written to: /path/to/sofa_scene/build

If I ignore the warning and run the make command, I get the following:

[ 50%] Building CXX object CMakeFiles/Sofa.dir/Main.cpp.o
/path/to/sofa_scene/Main.cpp:5:10: fatal error: sofa/helper/ArgumentParser.h: No such file or directory
 #include <sofa/helper/ArgumentParser.h>
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
CMakeFiles/Sofa.dir/build.make:62: recipe for target 'CMakeFiles/Sofa.dir/Main.cpp.o' failed
make[2]: *** [CMakeFiles/Sofa.dir/Main.cpp.o] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/Sofa.dir/all' failed
make[1]: *** [CMakeFiles/Sofa.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2

Hi @egarcm,

Do you mean sofa_scene/build/CMakeCache.txt ?

I do not have those strings in that file! In a fresh build, I do not have nearly as many lines as that.

@egarcm Ah! Yes, those fields are empty, indeed!

Did you figure out a workaround? Is that actually the root cause?

(What OS are you using, btw? I have a suspicion, the interaction between TinyXML and Ubuntu 17 might be going wrong in my case!)