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Fix use of length multiplier in several LibMesh methods #3773

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Merged
pshriwise merged 1 commit into from
Feb 5, 2026
+15 −3
Merged

Fix use of length multiplier in several LibMesh methods #3773

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18 changes: 15 additions & 3 deletions src/mesh.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -3669,8 +3669,15 @@ void LibMesh::initialize()
bbox_ = libMesh::MeshTools::create_bounding_box(*m_);
libMesh::Point ll = bbox_.min();
libMesh::Point ur = bbox_.max();
lower_left_ = {ll(0), ll(1), ll(2)};
upper_right_ = {ur(0), ur(1), ur(2)};
if (length_multiplier_ > 0.0) {
lower_left_ = {length_multiplier_ * ll(0), length_multiplier_ * ll(1),
length_multiplier_ * ll(2)};
upper_right_ = {length_multiplier_ * ur(0), length_multiplier_ * ur(1),
length_multiplier_ * ur(2)};
} else {
lower_left_ = {ll(0), ll(1), ll(2)};
upper_right_ = {ur(0), ur(1), ur(2)};
}
}

// Sample position within a tet for LibMesh type tets
Expand All @@ -3684,7 +3691,12 @@ Position LibMesh::sample_element(int32_t bin, uint64_t* seed) const
tet_verts[i] = {node_ref(0), node_ref(1), node_ref(2)};
}
// Samples position within tet using Barycentric coordinates
return this->sample_tet(tet_verts, seed);
Position sampled_position = this->sample_tet(tet_verts, seed);
if (length_multiplier_ > 0.0) {
return length_multiplier_ * sampled_position;
} else {
return sampled_position;
}
}

Position LibMesh::centroid(int bin) const
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