yade-users team mailing list archive

[chiara modenese <c.modenese@xxxxxxxxx>]

Hi Jerome,


On 10 February 2010 15:21, Jerome Duriez <jerome.duriez@xxxxxxxxxxxxxxx>wrote:

> chiara modenese a écrit :
>
>  // Apply gravity gradually
>> Vector3r gmax=Vector3r(0,-9810,0);
>> Vector3r deltag=Vector3r(0,0,0);
>> deltag=gmax/100; // apply the gravity in 100 steps
>>  if (fabs(g[1])<fabs(gmax[1]))
>>        {
>>            g=g+deltag;
>>        } else {              Omega::instance().stopSimulationLoop();
>>        }
>>
>>  Where are these lines ? In TriaxialCompressionEngine.cpp ?
>
YES

> And those :
>
>
>> gravityCondition->gravity = triaxialcompressionEngine->g; // set gravity
>> to the value in triaxialcompressionEngine
>> rootBody->engines.push_back(gravityCondition);
>>
>>  In TriaxialTest.cpp (function generate) ?
>
YES

>
> If yes it's normal that it does not work at all... Because here you define
> (see what's going on with "generate" of the TriaxialTest) a simulation
> taking into account gravity, but with a value of g equals to (vector)
> zero...
>
> What you wrote in TriaxialCompressionEngine (=first lines I quoted) can not
> modify the value of gravity applied by the GravityEngine (it even does not
> access to this Engine), which remains thus equal to 0...
>
>
Oh sorry, you are entirely right! I was just confused by the idea that
engines are called at each iteration...
So, can I access the gravity engine directly in the
TraixialCompressionEngine.cpp so I modify the value of the gravity only once
I need to?

cheers, Chiara


> Jerome
>