From 75d3a6ba2cecff01fcfaa999e1bfe378603a16c5 Mon Sep 17 00:00:00 2001
From: Frederick Roy <froy@lnrobo.com>
Date: Mon, 13 Apr 2026 13:02:08 +0900
Subject: [PATCH] add custom computebbox for femff instead of the bogus one
 from stateaccessor

---
 .../solidmechanics/fem/elastic/FEMForceField.h   |  2 ++
 .../solidmechanics/fem/elastic/FEMForceField.inl | 16 ++++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/Sofa/Component/SolidMechanics/FEM/Elastic/src/sofa/component/solidmechanics/fem/elastic/FEMForceField.h b/Sofa/Component/SolidMechanics/FEM/Elastic/src/sofa/component/solidmechanics/fem/elastic/FEMForceField.h
index 42ee6289ca8..c5eb9f4a3ee 100644
--- a/Sofa/Component/SolidMechanics/FEM/Elastic/src/sofa/component/solidmechanics/fem/elastic/FEMForceField.h
+++ b/Sofa/Component/SolidMechanics/FEM/Elastic/src/sofa/component/solidmechanics/fem/elastic/FEMForceField.h
@@ -67,6 +67,8 @@ class FEMForceField :
 
     void draw(const sofa::core::visual::VisualParams*) override;
 
+    void computeBBox(const core::ExecParams* params, bool onlyVisible) override;
+
     sofa::Data<ComputeStrategy> d_computeForceStrategy;
     sofa::Data<ComputeStrategy> d_computeForceDerivStrategy;
 
diff --git a/Sofa/Component/SolidMechanics/FEM/Elastic/src/sofa/component/solidmechanics/fem/elastic/FEMForceField.inl b/Sofa/Component/SolidMechanics/FEM/Elastic/src/sofa/component/solidmechanics/fem/elastic/FEMForceField.inl
index 656ffc47d92..bdae03ead2b 100644
--- a/Sofa/Component/SolidMechanics/FEM/Elastic/src/sofa/component/solidmechanics/fem/elastic/FEMForceField.inl
+++ b/Sofa/Component/SolidMechanics/FEM/Elastic/src/sofa/component/solidmechanics/fem/elastic/FEMForceField.inl
@@ -236,4 +236,20 @@ void FEMForceField<DataTypes, ElementType>::draw(const sofa::core::visual::Visua
     m_drawMesh.drawAllElements(vparams->drawTool(), x, this->l_topology.get());
 }
 
+template <class DataTypes, class ElementType>
+void FEMForceField<DataTypes, ElementType>::computeBBox(const core::ExecParams* params, bool onlyVisible)
+{
+    SOFA_UNUSED(params);
+
+    if(!onlyVisible)
+        return;
+
+    auto* vparams = sofa::core::visual::VisualParams::defaultInstance();
+
+    if(onlyVisible && !vparams->displayFlags().getShowForceFields())
+        return;
+
+    this->f_bbox.setValue(this->mstate->computeBBox());
+}
+
 }  // namespace sofa::component::solidmechanics::fem::elastic