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Don't compute placement if the cell is irrelevant

This commit is contained in:
Mael Rouxel-Labbé 2024-01-23 22:40:16 +01:00
parent fde721c471
commit 00a6efef6b
1 changed files with 38 additions and 14 deletions
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52
Isosurfacing_3/include/CGAL/Isosurfacing_3/internal/dual_contouring_functors.h
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@ -215,21 +215,20 @@ public:
bool position(const Domain& domain,
const typename Domain::Geom_traits::FT isovalue,
const typename Domain::Cell_descriptor& vh,
typename Domain::Geom_traits::Point_3& point) const
typename Domain::Geom_traits::Point_3& p) const
{
using FT = typename Domain::Geom_traits::FT;
using Point_3 = typename Domain::Geom_traits::Vector_3;
using Vertex_descriptor = typename Domain::Vertex_descriptor;
auto x_coord = domain.geom_traits().compute_x_3_object();
auto y_coord = domain.geom_traits().compute_y_3_object();
auto z_coord = domain.geom_traits().compute_z_3_object();
auto point = domain.geom_traits().construct_point_3_object();
typename Domain::Cell_vertices vertices = domain.cell_vertices(vh);
std::vector<Point_3> pos(vertices.size());
std::transform(vertices.begin(), vertices.end(), pos.begin(),
[&](const Vertex_descriptor& v) { return domain.point(v); });
// set point to cell center
point = CGAL::centroid(pos.begin(), pos.end(), CGAL::Dimension_tag<0>());
const std::size_t cn = vertices.size();
bool all_smaller = true;
bool all_greater = true;
@ -243,6 +242,18 @@ public:
if(all_smaller || all_greater)
return false;
FT x(0), y(0), z(0);
for(const auto& v : vertices)
{
const Point_3 cp = domain.point(v);
x += x_coord(cp);
y += y_coord(cp);
z += z_coord(cp);
}
// set point to cell center
p = point(x / cn, y / cn, z / cn);
return true;
}
};
@ -269,7 +280,7 @@ public:
bool position(const Domain& domain,
const typename Domain::Geom_traits::FT isovalue,
const typename Domain::Cell_descriptor& cell,
typename Domain::Geom_traits::Point_3& point) const
typename Domain::Geom_traits::Point_3& p) const
{
using FT = typename Domain::Geom_traits::FT;
using Point_3 = typename Domain::Geom_traits::Point_3;
@ -278,7 +289,10 @@ public:
using Vertex_descriptor = typename Domain::Vertex_descriptor;
using Edge_descriptor = typename Domain::Edge_descriptor;
typename Domain::Cell_vertices vertices = domain.cell_vertices(cell);
auto x_coord = domain.geom_traits().compute_x_3_object();
auto y_coord = domain.geom_traits().compute_y_3_object();
auto z_coord = domain.geom_traits().compute_z_3_object();
auto point = domain.geom_traits().construct_point_3_object();
// compute edge intersections
std::vector<Point_3> edge_intersections;
@ -299,16 +313,26 @@ public:
{
// current edge is intersected by the isosurface
const FT u = (val0 - isovalue) / (val0 - val1);
const Point_3 p_lerp = CGAL::ORIGIN + ((FT(1) - u) * (p0 - CGAL::ORIGIN) + u * (p1 - CGAL::ORIGIN));
const Point_3 p_lerp = point((FT(1) - u) * x_coord(p0) + u * x_coord(p1),
(FT(1) - u) * y_coord(p0) + u * y_coord(p1),
(FT(1) - u) * z_coord(p0) + u * z_coord(p1));
edge_intersections.push_back(p_lerp);
}
}
if(edge_intersections.empty())
const std::size_t en = edge_intersections.size();
if(en == 0)
return false;
point = CGAL::centroid(edge_intersections.begin(), edge_intersections.end(),
CGAL::Dimension_tag<0>()); // set point to center of edge intersections
FT x(0), y(0), z(0);
for(const Point_3& p : edge_intersections)
{
x += x_coord(p);
y += y_coord(p);
z += z_coord(p);
}
p = point(x / en, y / en, z / en);
return true;
}