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[Diffusion] Explicit MechanicalObject link #6073

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[Diffusion] Explicit MechanicalObject link #6073

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f73cf6b
ADD: explicit link alternative to mecaObj
GaetanDesrues Feb 20, 2026
10f8504
Merge pull request #1 from GaetanDesrues/explicit_meca_link
GaetanDesrues Feb 20, 2026
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1 change: 1 addition & 0 deletions Sofa/Component/Diffusion/src/sofa/component/diffusion/TetrahedronDiffusionFEMForceField.h
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Original file line number Diff line number Diff line change
Expand Up @@ -114,6 +114,7 @@ class TetrahedronDiffusionFEMForceField : public core::behavior::ForceField<Data

/// Link to be set to the topology container in the component graph.
SingleLink<TetrahedronDiffusionFEMForceField<DataTypes>, sofa::core::topology::BaseMeshTopology, BaseLink::FLAG_STOREPATH | BaseLink::FLAG_STRONGLINK> l_topology;
SingleLink<TetrahedronDiffusionFEMForceField<DataTypes>, MechObject, BaseLink::FLAG_STOREPATH | BaseLink::FLAG_STRONGLINK> l_mecaObj;


protected:
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28 changes: 23 additions & 5 deletions Sofa/Component/Diffusion/src/sofa/component/diffusion/TetrahedronDiffusionFEMForceField.inl
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Expand Up @@ -128,6 +128,7 @@ TetrahedronDiffusionFEMForceField<DataTypes>::TetrahedronDiffusionFEMForceField(
d_tagMeshMechanics(initData(&d_tagMeshMechanics, std::string("meca"),"tagMechanics","Tag of the Mechanical Object.")),
d_drawConduc( initData(&d_drawConduc, (bool)false, "drawConduc","To display conductivity map."))
, l_topology(initLink("topology", "link to the topology container"))
, l_mecaObj(initLink("mecaObj", "link to the 3D mechanical MechanicalObject"))
, m_topology(nullptr)
{
this->f_listening.setValue(true);
Expand Down Expand Up @@ -198,12 +199,29 @@ void TetrahedronDiffusionFEMForceField<DataTypes>::init()
}

/// Get the mechanical object containing the mesh position in 3D
core::objectmodel::Tag mechanicalTag(d_tagMeshMechanics.getValue());
this->getContext()->get(mechanicalObject, mechanicalTag,sofa::core::objectmodel::BaseContext::SearchUp);
if (mechanicalObject==nullptr)
/// Priority is the explicit link, with a fallback to historical tag-based lookup.
if (!l_mecaObj.empty())
{
msg_error() << "cannot find the mechanical object named '" << mechanicalObject << msgendl;
return;
mechanicalObject = l_mecaObj.get();
if (mechanicalObject == nullptr)
{
msg_error() << "No MechanicalState found at mecaObj link path '" << l_mecaObj.getLinkedPath() << "'.";
this->d_componentState.setValue(sofa::core::objectmodel::ComponentState::Invalid);
return;
}
}
else
{
core::objectmodel::Tag mechanicalTag(d_tagMeshMechanics.getValue());
this->getContext()->get(mechanicalObject, mechanicalTag, sofa::core::objectmodel::BaseContext::SearchUp);
if (mechanicalObject == nullptr)
{
msg_error() << "No MechanicalState found. Set 'mecaObj' link, or provide a valid 'tagMechanics' (current value: '"
<< d_tagMeshMechanics.getValue() << "').";
this->d_componentState.setValue(sofa::core::objectmodel::ComponentState::Invalid);
return;
}
msg_info() << "Using legacy tagMechanics lookup to find MechanicalState with tag '" << d_tagMeshMechanics.getValue() << "'.";
}

if(d_transverseAnisotropyRatio.getValue()!=1.0)
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