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Fix broken bg-mesh feature #95

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Fix broken bg-mesh feature #95

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43 changes: 42 additions & 1 deletion src/MeshImprovement.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1296,11 +1296,52 @@ void floatTetWild::apply_sizingfield(Mesh& mesh, AABBWrapper& tree) {
auto &tet_vertices = mesh.tet_vertices;
auto &tets = mesh.tets;

GEO::Mesh bg_mesh;
bg_mesh.vertices.clear();
bg_mesh.vertices.create_vertices((int)mesh.params.V_sizing_field.rows() / 3);
for (int i = 0; i < mesh.params.V_sizing_field.rows() / 3; i++) {
GEO::vec3& p = bg_mesh.vertices.point(i);
for (int j = 0; j < 3; j++)
p[j] = mesh.params.V_sizing_field(i * 3 + j);
}
bg_mesh.cells.clear();
bg_mesh.cells.create_tets((int)mesh.params.T_sizing_field.rows() / 4);
for (int i = 0; i < mesh.params.T_sizing_field.rows() / 4; i++) {
for (int j = 0; j < 4; j++)
bg_mesh.cells.set_vertex(i, j, mesh.params.T_sizing_field(i * 4 + j));
}
GEO::MeshCellsAABB bg_aabb(bg_mesh, false);

auto get_sizing_field_value = [&](const Vector3& p) {
GEO::vec3 geo_p(p[0], p[1], p[2]);
int bg_t_id = bg_aabb.containing_tet(geo_p);
if (bg_t_id == GEO::MeshCellsAABB::NO_TET)
return -1.;

// compute barycenter
std::array<Vector3, 4> vs;
for (int j = 0; j < 4; j++) {
vs[j] = Vector3(mesh.params.V_sizing_field(mesh.params.T_sizing_field(bg_t_id * 4 + j) * 3),
mesh.params.V_sizing_field(mesh.params.T_sizing_field(bg_t_id * 4 + j) * 3 + 1),
mesh.params.V_sizing_field(mesh.params.T_sizing_field(bg_t_id * 4 + j) * 3 + 2));
}
double value = 0;
for (int j = 0; j < 4; j++) {
Vector3 n = ((vs[(j + 1) % 4] - vs[j]).cross(vs[(j + 2) % 4] - vs[j])).normalized();
double d = (vs[(j + 3) % 4] - vs[j]).dot(n);
if (d == 0)
continue;
double weight = abs((p - vs[j]).dot(n) / d);
value += weight * mesh.params.values_sizing_field(mesh.params.T_sizing_field(bg_t_id * 4 + (j + 3) % 4));
}
return value; // / mesh.params.ideal_edge_length;
};

for (auto &p: tet_vertices) {
if (p.is_removed)
continue;
p.sizing_scalar = 1; //reset
double value = mesh.params.get_sizing_field_value(p.pos);
double value = get_sizing_field_value(p.pos);
if (value > 0) {
p.sizing_scalar = value / mesh.params.ideal_edge_length;
}
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