BTW, if you just want to load/save the state of the system, without the
model itself, you can come up with some easier yet not complete, solution
of using ChSystem::StateGather and ChSystem::StateScatter.
Something like:
auto state =
chrono_types::make_shared<ChState>(system.GetNumCoordsPosLevel(), &system);
auto state_der =
chrono_types::make_shared<ChStateDelta>(system.GetNumCoordsVelLevel(),
&system);
double time;
system.StateGather(*state , *state_der, time_dummy);
and similarly for the Scattering (i.e. loading back into ChSystem)
Please notice however that you have to make sure that the model is exactly
the same and also that can be additional relevant variables (e.g. some
variable in the timesteppers) that is not retrieved in this way thus making
a slight difference when you load back the state.
Il giorno giovedì 20 giugno 2024 alle 23:18:46 UTC+2 Dario Mangoni ha
scritto:
> Hi,
> yes there is.
>
> You may find more references by searching for the "archive" keyword
> instead of serialization.
> *demo_CH_archive
> <https://github.com/projectchrono/chrono/blob/main/src/demos/core/demo_CH_archive.cpp>*is
>
> a starting point, but it's probably showing many more features that just
> simply a Chrono system serialization.
> *utest_CH_archive
> <https://github.com/projectchrono/chrono/blob/main/src/tests/unit_tests/core/utest_CH_archive.cpp>*is
>
> another source of information, while it's meant for testing.
>
> In general you can import|export to JSON, XML and binary format.
>
> In general, for a whole ChSystem, you can simply do something like.
>
> {
> ChSystemNSC system;
> ADD THINGS TO YOUR SYSTEM
> std::ofstream mfileo("ChArchiveJSON_Pendulum.json");
> ChArchiveOutJSON archive_out(mfileo);
> archive_out << CHNVP(system);
> }
>
> std::ifstream mfilei("ChArchiveJSON_Pendulum.json");
> ChArchiveInJSON archive_in(mfilei);
>
> ChSystemNSC system;
> archive_in >> CHNVP(system);
>
> Please mind that not all the classes are enabled to serialization (e.g.
> ChVisualShapeFEA are not).
> You may be able to check which are enabled by checking the relative
> ArchiveIn|ArchiveOut methods for each class.
>
> Il giorno giovedì 20 giugno 2024 alle 20:00:49 UTC+2 [email protected]
> ha scritto:
>
>> Is there any way to serialize Chrono::Systems so that the system state is
>> recoverable from disk? I'd like to be able to save the state of the system
>> for debugging at a later date.
>>
>
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