yade-users team mailing list archive

[Jerome Duriez <jerome.duriez@xxxxxxxxxxxxxxx>]

chiara modenese a écrit :
> I tried to modify the value of gravity accessing the engine in the 
> TriaxialCompressionEngine, but still it does nothing..
How did you try to do this ? Normally with following lines in TCEngine, 
I guess it should work. They allow you to pass through all the engines 
of the simulation, and to change the "gravity" attribute of the 
"GravityEngine", once you found it.


           vector<shared_ptr<Engine> >::iterator itFirst = 
ncb->engines.begin(); // ncb is the Scene
           vector<shared_ptr<Engine> >::iterator itLast = 
ncb->engines.end();
           for ( ;itFirst!=itLast; ++itFirst )   // you check all the 
engines of the simulation
           {
               if ( ( *itFirst )->getClassName() == "GravityEngine" ) 
// that's the ClassName of this Engine, as it is defined in the first 
argument of YADE_CLASS_BASE_DOC_ATTRS of the .hpp (I guess ? I'm more 
used to other syntax, with REGISTER_CLASS_NAME(...))
               {
                   PtrGravityEngine =  YADE_PTR_CAST<GravityEngine> ( 
*itFirst ); // PtrGravityEngine should before be declared as a 
shared_ptr<GravityEngine>....
                   PtrGravityEngine ->gravity = "the value you want"
               }
           }



Jerome